1. A power grid planning method for collaborative new energy development is characterized in that the working process of the method comprises the following steps:

step S1, analyzing the power demand;

step S2, analyzing the characteristics of the new energy;

step S3, analyzing the power structure and the layout thereof;

step S4, analyzing the structure and performance of the power grid;

step S5, establishing a system comprehensive evaluation system;

and step S6, making a power grid planning scheme.

2. The method according to claim 1, wherein the analysis of the demand for electric energy is a power load prediction, and the power load prediction comprises: long-term prediction of power demand, peak load prediction, saturated load prediction, load distribution prediction, load structure prediction and load characteristic prediction.

3. The method according to claim 1, wherein the new energy characteristic analysis comprises: the method comprises the following steps of simulation of long-term output of new energy power generation, analysis of random characteristics of the long-term output of the new energy and analysis of time-space correlation of the long-term output of the new energy.

4. The method as claimed in claim 1, wherein the power structure and the layout analysis thereof and the power grid structure and the performance analysis thereof belong to large-scale new energy access power grid impact analysis, and the analysis includes: the influence of new energy grid connection on power balance, the influence of new energy grid connection on power grid flow, the influence of new energy grid connection on electric energy quality and the influence of new energy grid connection on safety of a power grid.

5. The power grid planning method for collaborative new energy development according to claim 1, wherein the establishment of the system comprehensive evaluation system evaluates large-scale new energy grid-connected operation and provides a basis for power investment work; the content of the evaluation comprises: the method comprises a new energy power system operation simulation and evaluation method, a new energy credible capacity evaluation method considering the reliability of a power grid and new energy grid-connected economy evaluation.

6. The method according to claim 5, wherein the method for simulating and evaluating the operation of the power system with new energy comprises: mathematical modeling of unit maintenance; modeling the medium-term and long-term hydroelectric power groups in a simulation mode; the new energy power generation system operates and simulates modeling; a daily operation simulation model under network constraint; performing combined operation simulation on new energy and conventional energy; an optimized operation method for minimizing wind and water abandonment.

7. The method for planning a power grid in coordination with new energy development according to claim 5, wherein the method for evaluating the credible capacity of new energy considering the reliability of the power grid comprises: simulating random production containing new energy; evaluating reliability indexes containing new energy; a new energy credible capacity calculation method.

8. The method according to claim 5, wherein the economic evaluation of the new energy grid connection comprises: analyzing the influence of new energy resource receiving on the system operation cost; analyzing the influence of new energy resource receiving on coal consumption and pollutant emission; analyzing the influence of new energy receiving people on electricity purchasing cost; and analyzing the influence of the new energy access on the utilization hours of the conventional unit.

9. The method according to claim 1, wherein the making of the grid planning scheme includes: the method comprises the steps of planning the capacity of a large-scale new energy delivery channel, optimizing and planning a power grid considering large-scale new energy access and planning the power grid facing new energy consumption.

10. The method according to claim 9, wherein the planning of the capacity of the large-scale new energy delivery channel comprises: in cooperation with analysis of the output probability characteristic of the new energy and the adequacy of the transmission capacity, the planning analysis of the transmission capacity considering the maximization of the side benefit of a power grid, the planning analysis of the transmission capacity considering the maximization of the social benefit and the planning analysis of the transmission capacity considering the uncertainty;

the power grid optimization planning considering the large-scale new energy access comprises the following steps: a power grid planning model of new energy grid connection, a dynamic calculation technology of network loss, a new energy output multi-scene analysis technology and a dynamic optimization technology oriented to a target grid structure;

the new energy consumption-oriented power grid planning method comprises the following steps: the method comprises the steps of analyzing system peak regulation capacity, analyzing system frequency modulation capacity, analyzing system standby level, analyzing power grid transmission capacity, analyzing new energy consumption capacity and planning a power grid with consumption capacity as a target.

Background

The new energy has the advantages of energy conservation and emission reduction, which is adapted to the sustainable development concept of China, and because of the vast territory of China, the new energy resources of China are rich, the distribution range is wide, and the types are numerous. The development of new energy technology plays an important role in the progress of various industries, and in the power grid planning process, new energy can be well applied, so that the stability of current and voltage in a power grid and the scientificity of power grid planning can be improved.

The large-scale access of new energy sources such as wind power and solar photovoltaic power generation enables a power system to face new challenges and significant changes in breeding. Firstly, the construction period of new energy is short, compared with the construction of new energy, the construction of matched power grid facilities is relatively slow, which is different from the condition that the construction period of a conventional power supply is far longer than the construction period of a power grid, and the construction of the power grid is required to be planned in advance and considered comprehensively; secondly, the output characteristics of the new energy are greatly different from those of the conventional unit (for example, the utilization hours of the new energy is far lower than that of the conventional unit, the output intermittency is strong, which leads to low line utilization rate and reduces the benefit of power grid investment), and the general experience and criterion of power grid planning of the power system for decades may not be suitable for future power grid planning, and a power grid planning model comprehensively considering investment cost, operation cost and safety risk needs to be researched.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a power grid planning method for collaborative new energy development, and the collaborative development of new energy and power grid planning can eliminate adverse effects in a key technology of power grid planning, so that the level of collaborative development is improved.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

a power grid planning method for collaborative new energy development comprises the following steps:

step S1, analyzing the power demand;

step S2, analyzing the characteristics of the new energy;

step S3, analyzing the power structure and the layout thereof;

step S4, analyzing the structure and performance of the power grid;

step S5, establishing a system comprehensive evaluation system;

and step S6, making a power grid planning scheme.

As a further improvement of the present invention, the power demand analysis is a power load prediction, and the power load prediction includes: long-term prediction of power demand, peak load prediction, saturated load prediction, load distribution prediction, load structure prediction and load characteristic prediction.

As a further improvement of the present invention, the new energy characteristic analysis includes: the method comprises the following steps of simulation of long-term output of new energy power generation, analysis of random characteristics of the long-term output of the new energy and analysis of time-space correlation of the long-term output of the new energy.

As a further improvement of the invention, the power structure and the layout analysis thereof, and the power grid structure and the performance analysis thereof belong to the large-scale new energy access power grid influence analysis, and the analysis contents comprise: the influence of new energy grid connection on power balance, the influence of new energy grid connection on power grid flow, the influence of new energy grid connection on electric energy quality and the influence of new energy grid connection on safety of a power grid.

As a further improvement, the establishment of the comprehensive evaluation system of the system evaluates the large-scale new energy grid-connected operation and provides a basis for power investment work; the content of the evaluation comprises: the method comprises a new energy power system operation simulation and evaluation method, a new energy credible capacity evaluation method considering the reliability of a power grid and new energy grid-connected economy evaluation.

As a further improvement of the present invention, the method for simulating and evaluating the operation of the new energy-containing power system includes: mathematical modeling of unit maintenance; modeling the medium-term and long-term hydroelectric power groups in a simulation mode; the new energy power generation system operates and simulates modeling; a daily operation simulation model under network constraint; performing combined operation simulation on new energy and conventional energy; an optimized operation method for minimizing wind and water abandonment.

As a further improvement of the present invention, the method for evaluating the credible capacity of the new energy in consideration of the reliability of the power grid includes: simulating random production containing new energy; evaluating reliability indexes containing new energy; a new energy credible capacity calculation method.

As a further improvement of the present invention, the economic assessment of the new energy grid connection includes: analyzing the influence of new energy resource receiving on the system operation cost; analyzing the influence of new energy resource receiving on coal consumption and pollutant emission; analyzing the influence of new energy receiving people on electricity purchasing cost; and analyzing the influence of the new energy access on the utilization hours of the conventional unit.

As a further improvement of the present invention, the making of the power grid planning scheme includes the following main contents: the method comprises the steps of planning the capacity of a large-scale new energy delivery channel, optimizing and planning a power grid considering large-scale new energy access and planning the power grid facing new energy consumption.

As a further improvement of the present invention, the planning of the capacity of the large-scale new energy delivery channel includes: in cooperation with analysis of the output probability characteristic of the new energy and the adequacy of the transmission capacity, the planning analysis of the transmission capacity considering the maximization of the side benefit of a power grid, the planning analysis of the transmission capacity considering the maximization of the social benefit and the planning analysis of the transmission capacity considering the uncertainty;

the power grid optimization planning considering the large-scale new energy access comprises the following steps: a power grid planning model of new energy grid connection, a dynamic calculation technology of network loss, a new energy output multi-scene analysis technology and a dynamic optimization technology oriented to a target grid structure;

the new energy consumption-oriented power grid planning method comprises the following steps: the method comprises the steps of analyzing system peak regulation capacity, analyzing system frequency modulation capacity, analyzing system standby level, analyzing power grid transmission capacity, analyzing new energy consumption capacity and planning a power grid with consumption capacity as a target.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:

the power grid planning method for cooperating with new energy development preliminarily combs power grid planning work under the condition of large-scale new energy receiving, summarizes main links and steps of the power grid planning work facing new energy grid connection, analyzes key technical problems of power grid planning for coordinating large-scale new energy, and provides beneficial reference for deepening and applying the power grid planning work under the situation of large-scale new energy development.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a general flow diagram of the present invention;

FIG. 2 is a content block diagram of new energy output characteristic analysis;

FIG. 3 is a content block diagram of a large-scale new energy access grid impact analysis;

FIG. 4 is a content block diagram of large-scale new energy grid-connected operation evaluation;

fig. 5 is a content block diagram of a large-scale new energy access grid planning.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting.

Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

As shown in figure 1 of the drawings, in which,

a power grid planning method for collaborative new energy development comprises the following steps:

step S1, analyzing the power demand;

step S2, analyzing the characteristics of the new energy;

step S3, analyzing the power structure and the layout thereof;

step S4, analyzing the structure and performance of the power grid;

step S5, establishing a system comprehensive evaluation system;

and step S6, making a power grid planning scheme.

Further, the power demand analysis is power load prediction, and the power load prediction includes: long-term prediction of power demand, peak load prediction, saturated load prediction, load distribution prediction, load structure prediction and load characteristic prediction.

The planning work of the new energy accessed to the power grid is mainly to realize comprehensive and systematic knowledge on the nature of the new energy power generation. The method comprises the principle of various types of new energy power generation, including how the new energy power generation completes the process of energy conversion from wind energy to electric energy, light energy to electric energy and the like, and key factors and influencing factors of the conversion process. The method also comprises different types of new energy power generation modes, and the problems of characteristics, relevance and the like when the conditions such as time, space, environment and the like are different.

Through new energy characteristic analysis, a corresponding mathematical model can be abstracted and established from a new energy power generation rule, and theoretical basis and support are provided for subsequent research work in each direction and each layer.

As shown in fig. 2, the new energy characteristic analysis includes: the method comprises the following steps of simulation of long-term output of new energy power generation, analysis of random characteristics of the long-term output of the new energy and analysis of time-space correlation of the long-term output of the new energy.

For the research on the planning level, the time scale is long, the long-term output of the new energy power generation needs to be simulated, and the primary task is the modeling work of the new energy output, which is the basis of the subsequent planning work.

The long-term output simulation of the new energy power generation not only comprises the simulation of physical quantities (wind speed, wind direction, illumination intensity, illumination angle and the like), but also comprises the simulation of the working characteristics of power generation equipment (wake effect of wind power generation, photo-generated soda effect of photovoltaic power generation and the like) and the simulation of the working characteristics of new energy grid connection (reactive power regulation of a double-fed fan, photovoltaic cell inverter equipment and the like).

The new energy has the characteristics of randomness and uncertainty, implies a deterministic rule after the uncertain problem, and has different expression forms under different layers and scales. For the research on the regularity of the new energy, a long-term statistical rule of the new energy output needs to be found through statistics and analysis of a large amount of historical data, the idea of data mining is shown, and a corresponding probability model description is established to provide a basis for subsequent long-term simulation.

The random characteristic analysis of the long-term output of the new energy comprises the following steps: analyzing randomness and volatility of new energy; analyzing the daily characteristic and the seasonal characteristic of the new energy power generation; analyzing the distribution characteristics of the new energy output; analyzing annual utilization hours of new energy; analyzing a capacity factor of the new energy; analyzing the wake effect of the wind turbine.

Further, the power structure and the layout analysis thereof, and the power grid structure and the performance analysis thereof belong to large-scale new energy access power grid impact analysis, and as shown in fig. 3, the specific analysis content includes: the influence of new energy grid connection on power balance, the influence of new energy grid connection on power grid flow, the influence of new energy grid connection on electric energy quality and the influence of new energy grid connection on safety of a power grid.

The balance of supply and demand of electrical energy is a necessary condition for the operation of the power system. For a conventional grid, the pressure of power balance of the grid comes from the real regulating capacity (real output upper and lower limits) of the generator set on the one hand, and from the random fluctuation of the power generation and transmission element faults and loads on the other hand. The problem is closely related to the frequency stability, power angle stability and voltage stability of the power system, and the requirements of system peak regulation, frequency modulation and the like are brought. The large-scale access of new energy has merged new elements into this problem: for example, the contradiction between the peak-reversal characteristics of a large-scale wind power grid during load valley at night and the output of a conventional thermal power generating unit, the contradiction between the strong fluctuation of new energy power generation and system rotation standby, and the like. To properly solve the series of contradictions, quantitative analysis needs to be performed on the influence of the new energy accessing to the power grid by combining the output characteristics of the new energy and various capability indexes of the system.

The influence of new energy grid connection on power balance comprises the following steps: the influence of large-scale access of wind power and photovoltaic power generation on the peak load regulation balance of the system; influence of large-scale wind power and photovoltaic power generation on frequency modulation; wind power and photovoltaic power generation are connected in large scale to influence the rotary standby.

The new energy source receiving power grid is in a mode of centralized access through convergence, also in a mode of distributed and dispersed receiving, and the characteristics of randomness, volatility and the like of new energy sources are taken into account, so that the distribution, the flow direction and the like of the original power grid tide can be changed. Weak links such as current carrying and voltage in the power grid can also change due to the change of the power flow.

The large-scale, distributed and randomly fluctuating new energy is accessed into the power grid, so that the power flow injection power of the power grid is diversified, the active and reactive power distribution rules in the power grid are more complex, and new pressure and challenge are brought to the problems of regulation and control, statistics and the like of power grid loss.

The main task of a power system is to provide high-quality electric energy for power consumers, the quality problems of the electric energy include voltage quality, current quality and the like, the service life, the working state, the working efficiency and the like of power generation equipment, power grid equipment and electric equipment are directly influenced, and huge economic loss is generated in severe cases. Under the condition of large-scale access of new energy, such as wind power generation

The fluctuation of the unit can bring a series of problems of voltage fluctuation, distortion rate, flicker and the like to a power grid. On one hand, the wind power generation technology is continuously improved and perfected, and the quality of the electric energy of the grid connection of the wind generation set is greatly improved by the novel power electronic equipment arranged in the wind generation set; on the other hand, efficient power filtering and reactive voltage support equipment are also effective ways to solve the problem.

In order to ensure that a power grid containing large-scale new energy contacts still has good power quality, on one hand, the influence of new energy access on different aspects of power quality needs to be qualitatively analyzed; on the other hand, a perfect electric energy quality index needs to be formulated, quantitative evaluation is carried out on the electric energy quality of the new energy grid connection, and a corresponding quasi-human standard is formulated according to specific conditions.

The influence of new energy grid connection on the quality of electric energy comprises the following steps: analyzing the influence of large-scale new energy access on the quality of electric energy; detecting the power quality of grid-connected new energy power generation; formulating an electric energy quality evaluation index; establishing an electric energy quality standard for new energy admittance; and improving the quality of the electric energy.

Safe and stable operation of the power system is a core task of electric power work. The large-scale access of new energy, and the grid-connected operation of a large amount of new energy power generation equipment increases the complexity of the safety and stability analysis of the power grid, and brings new problems to the safety and stability.

Under the condition of large-scale new energy access, the safety and the stability of a power grid need to be simulated and verified according to factors such as the type and the scale of new energy power generation grid-connected equipment. The problems of low voltage ride through of a wind power plant, island of distributed photovoltaic power generation, relay protection of a distribution network containing distributed photovoltaic power generation and the like are all large-scale new energy

The source grid connection brings special new problems, and the new problems need to be sufficiently emphasized and correspondingly analyzed in the planning stage.

The influence of new energy grid connection on the safety of the power grid comprises the following steps: detecting and analyzing the low voltage ride through capability of the wind power plant; analyzing the contribution of the wind power plant to the power grid short circuit; analyzing the problem of the photovoltaic grid-connected island; detection and prevention measures for the problem of the photovoltaic grid-connected island; calculating distribution network relay protection analysis of distributed photovoltaic power generation; and stability analysis of large-scale wind power and photovoltaic access is calculated.

As shown in fig. 4, the establishment of the system comprehensive evaluation system evaluates the large-scale new energy grid-connected operation and provides a basis for power investment work; the content of the evaluation comprises: the method comprises a new energy power system operation simulation and evaluation method, a new energy credible capacity evaluation method considering the reliability of a power grid and new energy grid-connected economy evaluation.

Further, the method for simulating and evaluating the operation of the new energy-containing power system comprises the following steps: mathematical modeling of unit maintenance; modeling the medium-term and long-term hydroelectric power groups in a simulation mode; the new energy power generation system operates and simulates modeling; a daily operation simulation model under network constraint; performing combined operation simulation on new energy and conventional energy; an optimized operation method for minimizing wind and water abandonment.

Further, the new energy credible capacity assessment method considering the reliability of the power grid comprises the following steps: simulating random production containing new energy; evaluating reliability indexes containing new energy; a new energy credible capacity calculation method.

Further, the economic assessment of the new energy grid connection comprises the following steps: analyzing the influence of new energy resource receiving on the system operation cost; analyzing the influence of new energy resource receiving on coal consumption and pollutant emission; analyzing the influence of new energy receiving people on electricity purchasing cost; and analyzing the influence of the new energy access on the utilization hours of the conventional unit.

As shown in fig. 5, the making of the power grid planning scheme includes the following main contents: the method comprises the steps of planning the capacity of a large-scale new energy delivery channel, optimizing and planning a power grid considering large-scale new energy access and planning the power grid facing new energy consumption.

Further, the planning of the capacity of the large-scale new energy delivery channel comprises: in cooperation with analysis of the output probability characteristic of the new energy and the adequacy of the transmission capacity, the planning analysis of the transmission capacity considering the maximization of the side benefit of a power grid, the planning analysis of the transmission capacity considering the maximization of the social benefit and the planning analysis of the transmission capacity considering the uncertainty;

the power grid optimization planning considering the large-scale new energy access comprises the following steps: a power grid planning model of new energy grid connection, a dynamic calculation technology of network loss, a new energy output multi-scene analysis technology and a dynamic optimization technology oriented to a target grid structure;

the new energy consumption-oriented power grid planning method comprises the following steps: the method comprises the steps of analyzing system peak regulation capacity, analyzing system frequency modulation capacity, analyzing system standby level, analyzing power grid transmission capacity, analyzing new energy consumption capacity and planning a power grid with consumption capacity as a target.

The new energy is accessed into the power grid in a large scale, and higher requirements are put forward on the safety, stability, reliability, economy and the like of the power grid. The development and application of new energy resources have made load forecasting and planning work of power systems more uncertain than in the past. The traditional power grid planning is generally based on a deterministic method, and the influence caused by uncertainty is not considered. The power grid planning method for coordinating the large-scale development of the new energy carries out preliminary combing on power grid planning work under the condition of large-scale new energy reception, summarizes main links and steps of the power grid planning work facing new energy grid connection, analyzes key technical problems of the power grid planning for coordinating the large-scale new energy, and can provide beneficial reference for deepening and applying the power grid planning work under the situation of the large-scale development of the new energy.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; it is obvious as a person skilled in the art to combine several aspects of the invention. And such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.