Analysis Method and System for New Energy Consumption Capacity of Power System Based on Source-Load Balance

Abstract

The present invention provides a method and system for analyzing the new energy absorption capacity of the power system based on source-load balance, including determining the startup capacity of different types of power sources in the provincial power system; decomposing the startup capacity to the municipal power system according to the unified regulation attributes, and determining the total output of different types of power sources based on boundary constraints; calculating the real-time peak-shaving profit and loss. If the real-time peak-shaving profit and loss value is positive, there is power abandonment and the new energy has not been fully absorbed. The present invention determines the startup capacity of all power sources in the provincial power system, and decomposes the startup capacity to the lower (municipal) power system, and obtains the total output of the power sources based on the constraints. By calculating the real-time peak-shaving profit and loss, the amount of abandoned power is obtained, which is used to evaluate the absorption capacity of the municipal power system for new energy. It can decompose the planning scale of wind power and photovoltaic power in the province based on the differences in the natural resources of the city itself, the strength of the power system, etc., and provide a reference for the scientific formulation of wind power and photovoltaic development plans in grassroots administrative regions.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical engineering power planning, and in particular to a method and system for analyzing the new energy absorption capacity of a power system based on source-load balance. Background Art

[0002] Vigorously developing new energy represented by wind power and photovoltaics is the only way to implement strategic goals such as "carbon peak and carbon neutrality" and build a new power system with new energy as the main body.

[0003] Recently, various provinces have successively clarified the annual development scale of wind power and photovoltaic power. However, the method for determining the timing and scale of wind power and photovoltaic development in provincial plans cannot be directly applied to the county level. The main reason is that the operation of the power system is generally based on the provincial power grid. Large power sources (including unified coal-fired power units, nuclear power, pumped storage, inter-provincial interconnection lines, etc.) and cross-regional interconnection lines are all coordinated and commanded by provincial or higher-level regulatory departments to achieve a dynamic balance between sources and loads in various regions. Therefore, strictly speaking, the current absorption capacity is a concept of a province or a larger region, and it is difficult to carry out specific calculations in counties or even cities. In the currently published literature, there is no method for decomposing the development scale of counties and regions based on the province's wind power and photovoltaic development goals. Summary of the Invention

[0004] The present invention provides a method and system for analyzing the new energy absorption capacity of an electric power system based on source-load balance, which is used to solve the problems of lack of absorption analysis and reasonable and complete planning of electricity at the provincial level and below.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A first aspect of the present invention provides a method for analyzing the new energy absorption capacity of a power system based on source-load balance, the method comprising the following steps:

[0007] Determine the startup capacity of different types of power sources in the power system at this level;

[0008] Decomposing the startup capacity into equivalent units of the lower-level power system according to the centralized dispatching attributes, and determining the total output of the different types of power sources based on boundary constraints including the peak-shaving capability of the power sources at this level;

[0009] Based on the real-time grid load, energy storage, external power reception and total power output, the real-time peak-shaving profit and loss is calculated. If the real-time peak-shaving profit and loss value is positive, there is power abandonment and the new energy has not been fully absorbed.

[0010] Furthermore, the calculation of the real-time peak load shaving profit and loss is specifically as follows:

[0011] Real-time peak-shaving profit and loss = real-time total network load + pumped storage and energy storage - external power received - total output of non-peak-shaving power sources - total minimum output of peak-shaving power sources.

[0012] Furthermore, if the power transmission of the lower level is to send out power, the value of the external power received is negative.

[0013] Furthermore, the different types of power sources include thermal power, hydropower, nuclear power, inter-provincial power transmission, wind power, photovoltaic power and energy storage power sources, and the energy storage power sources include pumped storage, peak-shaving gas and electrochemical energy storage.

[0014] Furthermore, the thermal power includes coal-fired power, and the calculation of the coal-fired power operating capacity is specifically as follows:

[0015] Coal-fired power generation capacity = maximum grid load during the period * (1 + spinning reserve ratio) - hydropower output - wind power reliable minimum output - photovoltaic power reliable minimum output - nuclear power installed capacity * 100% - waste heat and waste energy unit output - biomass and waste power unit output - centralized dispatching and self-contained unit output - local public power plant output - maximum power receiving capacity of the external power curve - gas-fired unit output.

[0016] Furthermore, the equivalent decomposition of the startup capacity to the lower-level power system according to the unified regulation attribute is specifically as follows:

[0017] Decompose the operating capacity of the centralized dispatching units at this level to the lower-level power systems according to the load rate;

[0018] Send the operating capacity of the lower-level non-centrally dispatched units to the current power system at this level;

[0019] Decompose the energy storage power source to the lower-level power system according to the load rate.

[0020] Furthermore, the boundary constraints also include the maximum planned installed capacity of different types of power sources, the maximum planned transmission capacity of external power, the maximum load value and the maximum output value of new energy.

[0021] A second aspect of the present invention provides a system for analyzing the new energy absorption capacity of a power system based on source-load balance, the system comprising:

[0022] A data acquisition unit is used to determine the startup capacity of different types of power sources in the power system at this level;

[0023] A data processing unit is configured to decompose the startup capacity into equivalent units of the lower-level power system according to the unified regulation attribute, and determine the total output of the different types of power sources based on boundary constraints including the peak regulation capability of the power source at this level;

[0024] The data analysis unit calculates the real-time peak-shaving profit and loss based on the real-time grid load, energy storage, external power reception and total power output. If the real-time peak-shaving profit and loss value is positive, there is power abandonment and the new energy has not been fully absorbed.

[0025] Furthermore, the calculation of the real-time peak load shaving profit and loss is specifically as follows:

[0026] Real-time peak-shaving profit and loss = real-time total network load + pumped storage and energy storage - external power received - total output of non-peak-shaving power sources - total minimum output of peak-shaving power sources.

[0027] A third aspect of the present invention provides a computer storage medium, wherein the computer storage medium stores computer instructions, and when the computer instructions are executed on the system, the system executes the steps of the method.

[0028] The power system new energy absorption capacity analysis system of the second aspect of the present invention can implement the method in the first aspect and the various implementation methods of the first aspect, and achieve the same effect.

[0029] The effects provided in the summary of the invention are only the effects of the embodiments, not all the effects of the invention. One of the above technical solutions has the following advantages or beneficial effects:

[0030] The present invention determines the startup capacity of all power sources and decomposes the startup capacity equivalently to the lower-level (municipal) power system, and obtains the total output of the power sources based on the constraints. By calculating the real-time peak-shaving profit and loss, the amount of abandoned electricity is obtained, which is used to evaluate the municipal power system's ability to absorb new energy. The embodiments of the present invention can decompose the province's wind power and photovoltaic planning scale based on the county's own natural resources, power system strength, etc., and provide a reference for the scientific formulation of wind power and photovoltaic development plans for grassroots administrative regions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 is a schematic flow chart of an embodiment of the method of the present invention;

[0033] Figure 2 It is a structural diagram of an embodiment of the system of the present invention. DETAILED DESCRIPTION

[0034] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings. The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. It should be noted that the components illustrated in the accompanying drawings are not necessarily drawn to scale. The present invention omits descriptions of well-known components and processing technologies and processes to avoid unnecessary limitations on the present invention.

[0035] like Figure 1 As shown, an embodiment of the present invention provides a method for analyzing the new energy absorption capacity of a power system based on source-load balance, the method comprising the following steps:

[0036] S1, determine the startup capacity of different types of power sources in the power system at this level;

[0037] S2: Decomposing the startup capacity into equivalent units of the lower-level power system according to the centralized dispatching attributes, and determining the total output of the different types of power sources based on boundary constraints including the peak-shaving capability of the power source at this level;

[0038] S3. Calculate the real-time peak-shaving profit and loss based on the real-time grid load, energy storage, external power reception, and total power output. If the real-time peak-shaving profit and loss value is positive, there is power curtailment and the new energy has not been fully absorbed.

[0039] In step S1, the main power sources of the power system include thermal power, hydropower, nuclear power, interprovincial transmission, wind power, and photovoltaic power. Thermal power includes coal-fired power, gas-fired power, waste heat and energy, biomass power, and waste-to-energy power. Coal-fired power can be further divided into centrally dispatched public coal-fired power, centrally dispatched self-owned coal-fired power, local public power plants, and local self-owned power plants according to different dispatch attributes. All power sources meet the power supply needs of loads at different times under the dispatch department's operating strategy. Flexibility adjustment resources mainly include new energy storage technologies such as pumped storage, peak-shaving gas, and electrochemical energy storage.

[0040] In actual production, to ensure peak load supply, the system must ensure that a large number of controllable power sources are in operation. Conventional power sources, including coal-fired and nuclear power plants, cannot be frequently started and stopped once in operation. Therefore, a specific power-on combination determines the system's minimum output during that period. Renewable energy generation is highly volatile and random. If a surge in renewable energy occurs during this period, it could lead to a short-term imbalance where the source exceeds the load, creating a consumption problem.

[0041] Generally speaking, with the exception of wind and photovoltaic power generation, the output of all other major power sources is controllable. Therefore, the load is met by adjusting the operation of coal-fired power plants during different periods. During periods of peak load regulation, other flexible adjustment methods such as coal-fired power plants, pumped storage, and energy storage are used to regulate the peak load. To ensure power supply, the coal-fired power capacity for a given period (such as a week) is determined by the power balance of that period. This capacity is determined by subtracting a certain proportion of the maximum load of the grid from the installed capacity or output of external power, hydropower, nuclear power, wind power, photovoltaic power, and other non-peak-shaving power sources.

[0042] The coal-fired power generation capacity can be determined by referring to the following method:

[0043] Coal-fired power generation capacity = maximum grid load during the period * (1 + spinning reserve ratio) - hydropower output - wind power reliable minimum output - photovoltaic power reliable minimum output - nuclear power installed capacity * 100% - waste heat and waste energy unit output - biomass and waste-to-energy unit output - centralized dispatching and self-contained unit output - local public power plant output - maximum power receiving capacity of the external power curve (by season) - gas-fired unit output - other power source output.

[0044] The spinning reserve ratio can be flexibly selected according to the actual situation of the system, and the value range is 5% to 13%.

[0045] On the premise of setting an upper limit on the power abandonment rate, the law can calculate the wind power and photovoltaic installed capacity that can be absorbed by the province.

[0046] In step S2, the equivalent decomposition includes decomposing the startup capacity of the coordinated units at this level to the lower-level power system according to the load rate; sending the startup capacity of the lower-level non-coordinated units to the current power system at this level; and decomposing the energy storage power source to the lower-level power system according to the load rate.

[0047] It is assumed that the province's power grid structure is relatively strong and there is no flow transfer obstruction.

[0048] Specifically: All power sources (including inter-provincial power transmission channels) are classified according to whether they are centrally dispatched and public. Centrally dispatched power sources include centrally dispatched public coal-fired power, centrally dispatched hydropower, nuclear power, inter-provincial power, centrally dispatched public cogeneration gas units, etc. Assuming that the operating capacity of the above units during this period is Unit public-province =U1+U2+…+U m , where 1-m are the types of centralized power sources. Define the equivalent centralized public units in the city, Unit public-city =Unit public-province ×L city / L province , where L province and L city They represent the maximum grid load values for each city in the province. The peak-shaving capacity of each type of unit in the equivalent centralized public generating unit retains the original unit attributes.

[0049] Non-centrally dispatched public power plants include centrally dispatched self-owned coal-fired power plants, local small hydropower plants, and other local thermal power plants. It is considered that non-centrally dispatched public power plants within each prefecture-level city belong to local ownership. private-city =U1+U2+…+U n , where 1-n are the power supply types of various non-centrally coordinated public power plants.

[0050] Similarly, flexible regulation resources such as pumped storage and energy storage are allocated according to the proportion of load in the city. flexibility-city =Unit flexibility-province ×L city / L province .

[0051] Boundary constraints also include the maximum planned installed capacity of different types of power sources, the maximum planned transmission capacity of external power, the maximum load value and the maximum output value of new energy.

[0052] Among them, the constraints related to the planned installed capacity of each power source include coal-fired power (centrally dispatched public coal-fired power, centrally dispatched self-contained coal-fired power, isolated grid units, and local small power plants), waste heat and waste energy units, biomass and garbage power generation units, gas units, nuclear power units, small hydropower units, and pumped storage units; the constraints related to the maximum transmission capacity of external power planning include the maximum transmission power of external power, including ultra-high voltage AC, 500 kV AC, and various DC.

[0053] Constraints on the peak-shaving capacity of each power source within the province include determining whether each power source participates in peak-shaving and, if so, setting its maximum peak-shaving depth. Coal-fired power units for heating are classified into heating and non-heating seasons, with heating power sources primarily operating in winter.

[0054] The maximum load value is obtained by calculating the load curve, which is obtained by taking the actual 8760-hour (365-day) full-network curve after restoration and superposition of distributed photovoltaic power generation and normalizing it to per unit; the maximum new energy processing value is obtained by normalizing the wind power and photovoltaic processing curves to the actual 8760-hour wind power and photovoltaic output curves in previous years; the maximum planned external power transmission capacity is obtained by normalizing the actual external power curve to per unit through the external power transmission curve, or directly selecting the planned 8760-hour external power transmission curve.

[0055] In step S3, the real-time peak load regulation profit and loss is calculated as follows:

[0056] 8760h hourly real-time peak-shaving profit and loss = real-time total network load + pumped storage and energy storage - external power reception - total output of non-peak-shaving power sources (wind, solar, nuclear, local power plants, biomass and garbage, waste heat and waste energy, etc.) - total minimum output of peak-shaving power sources.

[0057] If the power transmission of the lower level is sending out power, the value of the external power received is negative.

[0058] like Figure 2 As shown, the present invention also provides a power system new energy absorption capacity analysis system based on source-load balance, and the system includes a data acquisition unit 1, a data processing unit 2 and a data analysis unit 3.

[0059] The data acquisition unit 1 is used to determine the startup capacity of different types of power sources in the power system at this level; the data processing unit 2 is used to decompose the startup capacity to the lower-level power system according to the unified regulation attributes, and determine the total output of the different types of power sources based on boundary constraints including the peak-shaving capacity of the power source at this level; the data analysis unit 3 calculates the real-time peak-shaving profit and loss based on the real-time grid load, energy storage, external power reception and total power output. If the real-time peak-shaving profit and loss value is positive, there is power abandonment and the new energy has not been fully absorbed.

[0060] In the data analysis unit 3, the real-time peak-shaving profit and loss calculation is specifically as follows:

[0061] Real-time peak-shaving profit and loss = real-time total network load + pumped storage and energy storage - external power received - total output of non-peak-shaving power sources - total minimum output of peak-shaving power sources.

[0062] The present invention also provides a computer storage medium, wherein the computer storage medium stores computer instructions, and when the computer instructions are executed on the system, the system executes the steps of the method.

[0063] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A method for analyzing the new energy absorption capacity of a power system based on source-load balance, characterized by: The method comprises the following steps: Determine the startup capacity of different types of power sources in the power system at this level; Decomposing the startup capacity into equivalent units of the lower-level power system according to the centralized dispatching attributes, and determining the total output of the different types of power sources based on boundary constraints including the peak-shaving capability of the power sources at this level; Specifically: All power sources are classified according to whether they are centrally dispatched and public. Centrally dispatched power sources include centrally dispatched public coal-fired power, centrally dispatched hydropower, nuclear power, inter-provincial power, and centrally dispatched public cogeneration gas units. The operating capacity of the above units is , where 1-m are the types of centralized power sources; the equivalent centralized public unit startup capacity of the city is defined as , in and They represent the maximum grid load values of the province and each city respectively; the peak load regulation capacity of each type of unit in the equivalent centralized dispatching public units continues to use the original unit attributes; Non-centrally coordinated public power plants include self-owned coal-fired power, local small hydropower, and other local thermal power, and define the operating capacity of local units in prefectures and cities , where 1-n are the power supply types of various non-centrally coordinated public power plants; The flexible regulation resources of pumped storage and energy storage are allocated according to the load ratio of cities and prefectures. ; Boundary constraints also include the maximum planned installed capacity of different types of power sources, the maximum planned transmission capacity of external power, the maximum load value, and the maximum output value of new energy; The constraints related to setting the peak-shaving capacity of each power source in the province include determining whether each power source in the province participates in peak-shaving, and if so, setting its maximum peak-shaving depth; Based on the real-time grid load, energy storage, external power reception and total power output, the real-time peak-shaving profit and loss are calculated, and the amount of abandoned power is obtained, which is used to evaluate the city-level power system's ability to absorb new energy.

2. The method for analyzing the new energy absorption capacity of a power system based on source-load balance according to claim 1 is characterized in that: The calculation of the real-time peak-shaving profit and loss is specifically as follows: Real-time peak-shaving profit and loss = real-time total network load + pumped storage and energy storage - external power received - total output of non-peak-shaving power sources - total minimum output of peak-shaving power sources.

3. The method for analyzing the new energy absorption capacity of a power system based on source-load balance according to claim 2 is characterized in that: If the power transmission of the lower level is sending out power, the value of the external power received is negative.

4. The method for analyzing the new energy absorption capacity of a power system based on source-load balance according to claim 1 is characterized in that: The different types of power sources include thermal power, hydropower, nuclear power, inter-provincial power transmission, wind power, photovoltaic power and energy storage power sources, and the energy storage power sources include pumped storage, peak-shaving gas and electrochemical energy storage.

5. The method for analyzing the new energy absorption capacity of a power system based on source-load balance according to claim 4 is characterized in that: The thermal power includes coal-fired power, and the calculation of the coal-fired power operating capacity is specifically as follows: Coal-fired power generation capacity = maximum network load during the period * (1 + rotating reserve ratio) - hydropower output - wind power reliable minimum output - photovoltaic power reliable minimum output - nuclear power installed capacity * 100% - waste heat and waste energy unit output - biomass and waste unit output - centralized dispatching and self-contained unit output - local public power plant output - maximum power receiving capacity of the external power curve - gas-fired unit output.

6. The method for analyzing the new energy absorption capacity of a power system based on source-load balance according to claim 1 is characterized in that: The boundary constraints also include the maximum planned installed capacity of different types of power sources, the maximum planned transmission capacity of external power, the maximum load value and the maximum output value of new energy.

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