Capacity configuration method and system for water-wind-light-storage multi-energy complementary clean energy base

Abstract

The invention relates to the field of multi-energy complementary clean energy systems, in particular to a water-wind-light-storage multi-energy complementary clean energy base capacity configuration method and system, and the method comprises the following steps: collecting the related basic data of a hydropower station, wind power, photovoltaic, pumped storage and power transmission lines in a research area; analyzing and determining the wind and light electricity abandoning rate, the annual utilization hours of the power transmission channel comprehensive internet access channel, the comprehensive utilization demand of the reservoir and the pumping power limitation of the pumped storage power station; constructing a water-wind-light-storage multi-energy complementary clean energy base capacity configuration double-layer nested optimization model; and obtaining the optimal capacity configuration scheme of the clean energy base and the output process of each power supply under the capacity configuration scheme. Technical support can be provided for planning, development and construction of a watershed or regional water-wind-light-storage clean energy base, the wind-light-electricity absorption capacity of a hydropower station and a pumped storage power station is effectively improved, the wind-light-abandoning rate of a power grid is reduced, safe and stable operation of the power grid is guaranteed, and the energy conservation and emission reduction target of China is smoothly achieved.

Description

Technical Field

[0001] The present invention relates to the field of multi-energy complementary clean energy systems, and in particular to a capacity configuration method and system for a water, wind, solar and storage multi-energy complementary clean energy base. Background Art

[0002] At present, we are vigorously developing clean and renewable energy such as wind power, solar energy, and pumped storage, and actively promoting the development of multi-energy complementary models. In recent years, wind power, photovoltaics, and pumped storage have developed rapidly, and multiple clean energy base plans have been proposed. However, due to the characteristics of unstable and intermittent output of wind power and photovoltaic power generation, the large-scale grid connection of these power sources also brings new problems to the stable operation of the power system. In order to solve these problems, it is necessary to combine the characteristics of various power sources such as wind power, photovoltaics, hydropower, and pumped storage, study the reasonable configuration of various power sources, and optimize the power structure, so as to achieve the purpose of both more development and utilization of clean energy and safe and stable operation of the power system. Therefore, considering the integrated development of hydropower and pumped storage resources in the basin or region with the rich wind and solar resources in the surrounding area, by reasonably allocating the capacity of each power source, a development plan based on the water, wind, solar, and storage multi-energy complementary clean energy base is proposed in an integrated and large-scale development mode, which can save transmission line investment, improve the renewable energy absorption capacity and the quality of transmitted electricity, maximize comprehensive benefits, and ensure the smooth realization of energy conservation and emission reduction goals.

[0003] As complementary power sources with flexible adjustment capabilities, hydropower and pumped storage play a key role in the water, wind, solar and storage multi-energy complementary system. In addition to power generation, hydropower stations usually take into account other comprehensive utilization tasks such as flood control, water supply, and ecology. Therefore, the hydropower regulation capacity is limited by scheduling-related constraints such as flood control, water supply, ecological flow, and water level fluctuations during the actual complementary operation, and it is unable to give full play to its due regulation capacity, thereby affecting the compensation effect of hydropower on other power sources in the complementary system, resulting in abandoned wind and photovoltaic power. Pumped storage power stations are the most reliable, economical, long-life, large-capacity, and technologically mature energy storage devices in the power system. They have the characteristics of flexible operation, fast response, and double peak-shaving capabilities. They are combined with new energy sources such as wind power and photovoltaics for intraday complementary operation. When there is power abandonment due to large-scale new energy generation and low load, water is pumped to store electricity. It can provide both green electricity and green power, and is an ideal energy storage power source for the power grid. For large-scale bases of new energy such as wind and solar, where the hydropower consumption capacity is limited, pumped storage power stations can better make up for the lack of hydropower regulation capacity, and further improve the new energy consumption capacity and the quality of transmitted electricity. Since pumped storage power station units are generally fixed-speed units, the pumping input power is relatively fixed. When pumped storage power stations are operated in conjunction with wind and solar power, which have large output fluctuations, the consumption of wind and solar power is subject to certain restrictions.

[0004] At present, the research on the complementary capacity configuration of hydropower, wind, solar and storage is mainly based on the power grid side, and is carried out for complementary systems with determined capacity. It rarely considers the influencing factors of the comprehensive utilization demand of hydropower station reservoirs and the pumping power constraints of fixed-speed units of pumped-storage power stations. Therefore, it is not suitable for complementary systems with uncertain capacity, and cannot effectively improve the wind and solar power absorption capacity of hydropower stations and pumped-storage power stations, and reduce the wind and solar power abandonment rate of the power grid. Summary of the invention

[0005] The purpose of the present invention is to provide a capacity configuration method and system for a water-wind-solar-storage multi-energy complementary clean energy base, which can solve the technical problems of improving the wind and solar power absorption capacity of hydropower stations and pumped storage power stations and reducing the wind and solar power abandonment rate of the power grid in various capacity configuration systems.

[0006] To achieve the above purpose, the present invention designs a capacity configuration method for a water, wind, solar and storage multi-energy complementary clean energy base, comprising the following steps:

[0007] Collect basic information on hydropower stations, wind power, photovoltaics, pumped storage and transmission lines in the study area;

[0008] Formulate basic principles for the study of water, wind, solar and storage resource allocation and boundary conditions for joint and complementary operation;

[0009] Simulate the hourly output process of wind and solar power;

[0010] Analyze and determine the wind and solar power curtailment rate, the annual utilization hours of the comprehensive access channel of the transmission channel, the comprehensive utilization demand of the reservoir and the pumping power limit of the pumped storage power station;

[0011] Runoff regulation calculation generation takes into account the comprehensive utilization of the limiting output process;

[0012] Construct a double-layer nested optimization model for capacity configuration of water, wind, solar and storage multi-energy complementary clean energy base;

[0013] The optimization algorithm is used to solve the model to obtain the optimal capacity configuration plan of the clean energy base and the output process of each power source under this capacity configuration plan.

[0014] As the preferred solution, the basic principles include considering the safe and stable operation requirements of hydropower stations, pumped-storage power stations, power grids, and transmission channels; wind and solar resources should be connected to hydropower stations or pumped-storage power stations nearby to make full use of hydropower transmission channels and the energy storage function of pumped-storage power stations; make full use of the flexible adjustment performance of hydropower and pumped-storage power stations to cooperate with the complementary operation of wind and solar, promote the consumption of wind and solar, and reduce the abandonment rate of wind and solar.

[0015] Furthermore, the boundary conditions include using the capacity of the supporting hydropower transmission channel as the maximum transmission capacity to control the complementarity of water, wind and solar power. When the capacity of the hydropower transmission channel is insufficient, considering adding new pumped-storage power stations to complement the wind and solar power, and re-planning the additional transmission capacity and scale; combining the output characteristics of new energy and the regulation capabilities of hydropower and pumped storage, hydropower stations and pumped-storage power stations are considered to be complementary on a daily time scale; hydropower and pumped-storage power stations smooth the fluctuations in new energy output; the proportion of wind and solar power is initially determined according to the proportion of the final scale of wind and solar resources.

[0016] As a preferred solution, the simulation of the hourly wind and solar power output process specifically includes the following steps:

[0017] Combined with the wind resource data of the wind farm in the study area, a computational fluid dynamics model was established for the entire wind farm to simulate the resource situation of the wind farm and the output process of 8760 hours throughout the year;

[0018] Combined with the collected solar radiation database of the research area, photovoltaic simulation software was used to build a model and simulate the output process of the photovoltaic power station for 8760 hours a year.

[0019] As a preferred solution, the determination of the wind and solar power abandonment rate, the annual utilization hours of the comprehensive access channel of the transmission channel, the comprehensive utilization demand of the reservoir and the pumping power limit of the pumped storage power station specifically includes the following steps:

[0020] The total wind and solar power abandonment rate is no more than 5% and the annual utilization hours of the transmission capacity channel are no less than 5000h as the limit of the actual output process of wind power and photovoltaic power in the complementary system. If the limit is exceeded, the wind power and photovoltaic power grid output allocation principle will be re-established;

[0021] According to the comprehensive utilization requirements of flood control limit water level or ecological flow of each reservoir, the water is divided into several time periods according to the monthly / ten-day time scale, and the corresponding hydropower station's limited output to maintain the downstream ecological flow or flood control limit water level is calculated. Then, the monthly / ten-day hydropower limited output is extended and applied to the hydropower complementary operation with hourly steps, generating the 8760-hour limited output process of the hydropower station throughout the year;

[0022] According to the single-unit capacity of each unit in the pumped-storage power station and the requirements for the pumping power of the fixed-speed units, when the base wind and photovoltaic power is used as the pumping power source of the pumped-storage power station, the output limit of wind and photovoltaic power as the pumped power source is generated according to the pumping power of different numbers of units.

[0023] As a preferred solution, the two-layer nested optimization model is composed of an upper optimization model and a lower optimization model. The upper optimization model solves the problem of pumped storage, wind power and photovoltaic capacity configuration, and provides a planning scheme for pumped storage power stations, wind power and photovoltaic capacity for the lower layer; the lower optimization model solves the problem of joint operation of pumped storage, wind power and photovoltaics, and outputs a stable external output through the energy storage regulation function of the pumped storage power station.

[0024] Furthermore, the upper optimization model includes an objective function and constraints, which are as follows:

[0025] A. Objective function: When the annual utilization hours of the access channel are not less than a certain threshold and the wind and photovoltaic abandonment rate of the joint system is not higher than a certain threshold, the scale of the hydro-wind-solar-storage multi-energy complementary new energy base is the largest;

[0026]

[0027] Where:

[0028] P is the scale of the new energy base with multiple complementary energies of water, wind, solar and storage;

[0029] are the installed capacities of pumped storage, hydropower, wind power and photovoltaic power for the mth capacity configuration scheme, respectively;

[0030] m is the number of the hydropower or pumped storage power station and wind power and photovoltaic capacity configuration plan;

[0031] M is the total number of hydropower or pumped storage power stations and wind power and photovoltaic capacity configuration options;

[0032] F m is the wind and solar power curtailment rate of the mth hydropower or pumped storage power station and wind power and photovoltaic capacity configuration scheme;

[0033] T is the length of a year, i.e. 8760h;

[0034] Δt is the step length of the calculation period;

[0035] They are the wind and solar output abandoned in period t for the mth pumped storage power station and the wind and photovoltaic capacity configuration schemes;

[0036] are the total wind power and photovoltaic power generation outputs of the mth pumped storage power station and the wind power and photovoltaic capacity configuration schemes in period t;

[0037] F is the given threshold of wind-solar curtailment rate of the combined system, which is 5%;

[0038] H m The number of hours of access to the grid for the configuration scheme of the mth pumped storage power station with wind power and photovoltaic capacity;

[0039] are the wind power, photovoltaic, hydropower, and pumped storage grid-connected outputs in period t of the mth hydropower or pumped storage power station and the wind power and photovoltaic capacity configuration schemes;

[0040] P m The system access capacity for the mth hydropower or pumped storage power station and wind power and photovoltaic capacity configuration scheme;

[0041] H is the threshold of the number of hours of Internet access utilization, which is 5000 hours;

[0042] B. Constraints;

[0043] Capacity constraints of pumped storage power stations:

[0044]

[0045] Hydropower station capacity constraints:

[0046]

[0047] Wind power and photovoltaic capacity constraints:

[0048]

[0049] Transmission channel capacity constraints:

[0050] P min ≤P m ≤P max ;

[0051] Where:

[0052] The installed capacity of the pumped storage power station for the mth pumped storage power station with wind power and photovoltaic capacity configuration scheme;

[0053] The minimum and maximum installed capacity of the selected pumped storage sites in the system;

[0054] The installed capacity of the pumped storage power station for the mth hydropower station with wind power and photovoltaic capacity configuration scheme;

[0055] The minimum and maximum installed capacity of the hydropower stations selected in the system;

[0056] They are the minimum and maximum installed capacity of wind power in the system respectively;

[0057] They are the minimum and maximum installed PV capacity in the system, respectively;

[0058] P m The access capacity of the m-th pumped storage power station with wind power and photovoltaic capacity configuration scheme;

[0059] P min , P max They are the minimum and maximum capacities of the transmission access channel in the joint system with different capacity configuration schemes.

[0060] Furthermore, the lower layer optimization model includes an objective function and constraints, which are as follows:

[0061] A. Objective function: Minimize the volatility of combined power generation output;

[0062] Under the configuration of different pumped storage power stations, wind power and photovoltaic capacity configuration schemes given by the upper layer, the combined system can smooth the short-term random fluctuations of photovoltaic and wind power through the regulation of hydropower or pumped storage power stations. Considering the long-distance power transmission of the water-wind-solar-storage combined system, it is not suitable to bear the peak load of the receiving power grid. The optimization objective function with the minimum fluctuation of the combined power generation output is proposed:

[0063]

[0064] Where:

[0065] f is the variance of the combined power generation output;

[0066] Provide power generation for the combined power generation system;

[0067] To calculate the average value of the combined power generation output during the operation cycle;

[0068] ) is the pumped storage power output of the mth pumped storage power station in the t period of the wind power and photovoltaic capacity configuration scheme;

[0069] The hydropower grid-connected output in period t of the mth hydropower, wind power and photovoltaic capacity configuration scheme;

[0070] B. Constraints;

[0071] Power balance constraints of pumped storage power stations:

[0072]

[0073] Grid transmission power limit:

[0074]

[0075] Reservoir storage constraints:

[0076]

[0077] Storage capacity constraints:

[0078]

[0079] When the pumped storage power station generates electricity, the change in storage capacity of the upper reservoir is:

[0080]

[0081] When the pumped storage power station pumps water, the change in storage capacity of the upper reservoir is:

[0082]

[0083] Constraints on power generation and pumping output of pumped storage power stations:

[0084]

[0085] Pumped storage pumping conditions and power generation conditions cannot be constrained at the same time:

[0086]

[0087] Hydropower output constraints:

[0088]

[0089] Constraints on daily hydropower balance:

[0090]

[0091] Wind power and photovoltaic output constraints:

[0092]

[0093] Where:

[0094] The pumping output of the pumped storage power station in period t for the mth pumped storage power station and the wind power and photovoltaic capacity configuration scheme;

[0095] They represent the minimum and maximum values ​​of hydropower, wind power, and solar power storage output that the transmission line of the mth capacity configuration scheme can accept respectively;

[0096] are the minimum and maximum energy storage values ​​of the upper pumped storage reservoir of the mth capacity configuration scheme, respectively;

[0097] E m (t), E m (t+1) represents the energy storage value of the pumped storage power station at time t and t+1 for the mth capacity configuration scheme;

[0098] η p , η h They are the pumping and power generation efficiencies of pumped storage power stations, respectively;

[0099] are the minimum and maximum storage capacities of the upper reservoir of the pumped storage power station in the mth capacity configuration scheme;

[0100] V m (t), V m (t+1) are the storage capacities of the upper reservoir of the pumped storage power station at time t and t+1 of the mth capacity configuration scheme;

[0101] H ft , H ct They are power generation and pumping head of pumped storage power station;

[0102] are the minimum and maximum power output of the pumped storage power station respectively;

[0103] are the minimum and maximum values ​​of the pumped output of the pumped storage power station, respectively;

[0104] The wind power and photovoltaic power are used for the remaining output of the pumped storage power station after pumping water in the mth capacity configuration scheme;

[0105] P p-pump It is the rated pumping power of a single unit in a pumped-storage power station;

[0106] n is the unit number of the pumped storage power station;

[0107] N is the total number of units in the pumped storage power station;

[0108] They are the minimum and maximum power generation output after comprehensive utilization of hydropower taking into account ecological flow and flood control limit water level;

[0109] is the average daily output of hydropower in the complementary system;

[0110] I is the total number of time periods per day, which is 24 hours;

[0111] They are the maximum power generation output of wind power and photovoltaic power respectively.

[0112] The present invention also designs a capacity configuration system for a water, wind, solar and storage multi-energy complementary clean energy base, including a data collection module, a basic principle and boundary condition formulation module, an output process simulation module, a restriction condition determination module, an output process calculation restriction module, a double-layer nested optimization model construction module, and an optimal capacity configuration solution solution module.

[0113] Data collection module, used to collect basic data related to hydropower stations, wind power, photovoltaics, pumped storage and transmission lines in the study area;

[0114] Formulate basic principles and boundary conditions module, which is used to formulate the basic principles of water, wind, solar and storage resource allocation research and the boundary conditions of joint and complementary operation;

[0115] The output simulation module is used to simulate the hourly output process of wind and solar power;

[0116] The module for determining the restriction conditions is used to analyze and determine the wind and solar power abandonment rate, the annual utilization hours of the comprehensive access channel of the transmission channel, the comprehensive utilization demand of the reservoir and the pumping power limit of the pumped storage power station;

[0117] Calculation limit output process module, used for runoff regulation calculation generation considering comprehensive utilization limit output process;

[0118] Construct a double-layer nested optimization model module to construct a double-layer nested optimization model for capacity configuration of a water, wind, solar and storage multi-energy complementary clean energy base;

[0119] The module for solving the optimal capacity configuration scheme is used to solve the model using an optimization algorithm to obtain the optimal capacity configuration scheme of the clean energy base and the output process of each power source under the capacity configuration scheme.

[0120] As a preferred solution, the two-layer nested optimization model is composed of an upper optimization model and a lower optimization model. The upper optimization model solves the problem of pumped storage, wind power and photovoltaic capacity configuration, and provides a planning scheme for pumped storage power stations, wind power and photovoltaic capacity for the lower layer; the lower optimization model solves the problem of joint operation of pumped storage, wind power and photovoltaics, and outputs a stable external output through the energy storage regulation function of the pumped storage power station.

[0121] Beneficial effects of the present invention:

[0122] The present invention takes into account the impact of reservoir flood control, water supply, ecology, shipping needs and the pumping power of pumped-storage power stations on the capacity configuration plan of water-wind-solar-storage clean energy bases. On the premise of absorbing the wind, solar and power output of the base as much as possible and transmitting it stably, the output characteristics of each power source participating in the operation of the complementary system are analyzed, and a capacity configuration model of the water-wind-solar-storage clean energy base is established. The optimization algorithm is used to solve it, and the optimal capacity configuration plan of the water-wind-solar-storage clean energy base considering the comprehensive utilization of hydropower and the constraints of pumping power is obtained. This can provide technical support for the planning, development and construction of water-wind-solar-storage clean energy bases in a river basin or region, effectively enhance the wind and solar power absorption capacity of hydropower stations and pumped-storage power stations, reduce the wind and solar power abandonment rate of the power grid, and ensure the safe and stable operation of the power grid and the smooth realization of my country's energy conservation and emission reduction goals. BRIEF DESCRIPTION OF THE DRAWINGS

[0123] Figure 1 is a flow chart of the present invention;

[0124] Figure 2 The hydropower output process of the present invention on a ten-day basis;

[0125] Figure 3 This is the typical daily power generation process of wind power and photovoltaic power generation in the present invention;

[0126] Figure 4 This is the typical annual output process of wind power and photovoltaic power in the present invention;

[0127] Figure 5 The output process of the water-wind-solar and wind-solar-storage multi-energy complementary base within 6 million KW;

[0128] Figure 6 The output process is within 60MW for the water-wind-solar and wind-solar-storage multi-energy complementary base. DETAILED DESCRIPTION

[0129] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0130] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0131] The present invention aims at the problem that the capacity configuration method of water, wind, solar and storage clean energy bases rarely considers the impact of the comprehensive utilization demand of reservoirs and the pumping power limit of pumped storage power stations on capacity configuration. The present invention proposes a capacity configuration method of water, wind, solar and storage clean energy bases considering the comprehensive utilization of hydropower and the pumping power constraint. The purpose is to fill the deficiencies of the existing technology, to achieve the optimal capacity configuration plan of water, wind, solar and storage clean energy bases by considering the comprehensive utilization demand of reservoirs in clean energy bases and the pumping power limit of pumped storage power stations under the conditions of clarifying the hydropower installed capacity, reservoir regulation performance and pumped storage power station unit characteristics, and to provide technical support for the planning, development and construction of water, wind, solar and storage bases with integrated clean energy in river basins or regions.

[0132] In order to solve the above-mentioned problems, the present invention provides a capacity configuration method and system for a water-wind-solar-storage multi-energy complementary clean energy base, which takes into account the comprehensive utilization of hydropower and pumping power constraints, as well as the impact of reservoir flood control, water supply, ecology, shipping needs and the pumping power of pumped-storage power stations on the capacity configuration plan of the water-wind-solar-storage clean energy base. On the premise of absorbing the wind and solar power of the base as much as possible and stably transmitting the output, the output characteristics of each power source participating in the operation of the complementary system are analyzed, and a capacity configuration model of the water-wind-solar-storage clean energy base is established. The optimization algorithm is used to solve it, and the optimal capacity configuration plan of the water-wind-solar-storage clean energy base considering the comprehensive utilization of hydropower and pumping power constraints is obtained. This can provide technical support for the planning, development and construction of water-wind-solar-storage clean energy bases in a river basin or region, effectively improve the wind and solar power absorption capacity of hydropower stations and pumped-storage power stations, reduce the wind and solar power abandonment rate of the power grid, and ensure the safe and stable operation of the power grid and the smooth realization of my country's energy conservation and emission reduction goals.

[0133] The present invention relates to a capacity configuration method for a water, wind, solar and storage multi-energy complementary clean energy base, comprising the following steps:

[0134] Step 1. Collect and organize basic data; collect basic data related to hydropower stations, wind power, photovoltaics, pumped storage and transmission lines in the study area.

[0135] Step 2. Formulate the basic principles for the research on water, wind, solar and storage resource allocation and the main boundary conditions for joint and complementary operation.

[0136] Step 3. Simulate the hourly output process of wind and solar power for 8760 hours. The output process refers to the power output process.

[0137] Step 4. Analyze and determine the wind and solar power abandonment rate and the annual utilization hours of the comprehensive access channel of the transmission channel; determine the new energy abandonment rate of the water, wind, solar and storage clean energy base, the annual utilization hours of the transmission line access channel, the comprehensive utilization demand of the reservoir and the pumping power limit of the pumped storage power station.

[0138] Step 5. Runoff regulation calculation generation considering comprehensive utilization of limiting output process;

[0139] Step 6. Construct a double-layer nested optimization model for capacity configuration of a water, wind, solar and storage multi-energy complementary clean energy base.

[0140] Step 7. Use the optimization algorithm to solve the model and obtain the optimal capacity configuration plan of the clean energy base and the output process of each power source under the capacity configuration plan.

[0141] The basic data collection and analysis described in step 1 includes the following:

[0142] (1.1) Collect the comprehensive utilization needs of long-range runoff, flood control, water supply, downstream ecological flow, etc. of each reservoir that has been built or planned in the study area, the output characteristics of hydropower station units, and the site resources of pumped storage power stations; collect the historical measured 8760-hour hourly output of wind farms and photovoltaic power stations built in the study area, as well as the scale of wind and solar resource development, wind speed, irradiance, etc. in the region.

[0143] (1.2) Collect the transmission characteristics, maximum channel capacity limitations, and historical annual utilization hours of the transmission line access channels in the area to be studied.

[0144] Step 2 specifically includes the following:

[0145] (2.1) The basic principles include considering the safe and stable operation requirements of hydropower stations, pumped-storage power stations, power grids, and transmission channels; wind and solar resources should be connected to the nearest hydropower station or pumped-storage power station, making full use of the hydropower transmission channels and the energy storage function of pumped-storage power stations to save transmission investment; using the flexible adjustment performance of hydropower and pumped-storage power stations to cooperate with wind and solar complementary operations, promote wind and solar consumption, improve resource utilization, and minimize wind and solar abandonment rates.

[0146] (2.2) Boundary conditions include taking the capacity of the supporting hydropower transmission channel as the maximum transmission capacity to control the complementarity of water, wind and solar power. When the capacity of the hydropower transmission channel is insufficient, considering adding pumped storage power stations to complement the wind and solar power, and re-planning the additional transmission capacity and scale; combining the output characteristics of new energy and the regulation capacity of hydropower and pumped storage, hydropower stations and pumped storage power stations are considered to complement each other on a daily time scale; in order to absorb as much new energy as possible, hydropower and pumped storage power stations try to smooth the fluctuation of new energy output; the proportion of wind and solar power is initially determined according to the proportion of the final scale of wind and solar resources.

[0147] Step 3 specifically includes the following:

[0148] (3.1) Combined with the wind resource data of wind farms in the study area, a computational fluid dynamics model is established for the entire wind farm to simulate the resource situation of the wind farm and the output process of 8760 hours throughout the year.

[0149] (3.2) Combined with the collected solar radiation database of the study area, PVsyst7.1 photovoltaic simulation software was used to build a model and simulate the output process of the photovoltaic power station for 8760 hours throughout the year.

[0150] Step 4 specifically includes the following:

[0151] (4.1) The actual output process of wind power and photovoltaic power in the complementary system is limited to the total wind and solar power curtailment rate not exceeding 5% and the annual utilization hours of the integrated access to the external transmission capacity channel not less than 5,000 hours. When the total wind and solar power curtailment rate is greater than 5% or the integrated access to the external transmission capacity channel is less than 5,000 hours, the daily output process of hydropower and pumped storage power stations is adjusted, and the wind power and photovoltaic access output allocation principle is re-established to achieve the purpose of reducing wind and solar curtailment.

[0152] (4.2) According to the comprehensive utilization requirements of flood control limit water level or ecological flow of each reservoir, the time scale is divided into several time periods according to the monthly (or ten-day) time scale, and the corresponding hydropower station's limited output to maintain the downstream ecological flow or flood control limit water level is calculated. Then, the monthly / ten-day hydropower limited output is extended and applied to the hydropower complementary operation with hourly steps, generating a 8760-hour limited output process for the hydropower station.

[0153] (4.3) According to the unit capacity of each unit of the pumped-storage power station and the requirements for the pumping power of the fixed-speed units, when the base wind and photovoltaic power is used as the pumping power source of the pumped-storage power station, the output limit of wind and photovoltaic power as the pumping power source is generated according to the pumping power of different numbers of units.

[0154] Step 6 specifically includes the following:

[0155] The double-layer nested optimization model for capacity configuration of the water, wind, solar and storage multi-energy complementary clean energy base constructed in step 6 is composed of an upper optimization model and a lower optimization model, and specifically includes the following contents:

[0156] (6.1) The constructed double-layer nested planning model, the upper layer solves the problem of pumped storage and wind power, photovoltaic capacity configuration, and provides the lower layer with a planning scheme for pumped storage power stations and wind power, photovoltaic capacity; the lower layer solves the problem of joint operation of pumped storage, wind power, and photovoltaic power, and outputs a stable power transmission process through the energy storage regulation of the pumped storage power station, so as to maximize the safety and reliability of the power grid.

[0157] (6.2) Upper layer optimization model;

[0158] A. Objective function: When the number of hours of access to the Internet is not less than a certain threshold and the wind and photovoltaic abandonment rate of the joint system is not higher than a certain threshold, the scale of the new energy base with multiple complementary energies of water, wind, solar and storage is the largest;

[0159]

[0160] Where:

[0161] P is the scale of the new energy base with multiple complementary energies of water, wind, solar and storage;

[0162] are the installed capacities of pumped storage, hydropower, wind power and photovoltaic power for the mth capacity configuration scheme, respectively;

[0163] m is the number of the hydropower or pumped storage power station and wind power and photovoltaic capacity configuration plan;

[0164] M is the total number of hydropower or pumped storage power stations and wind power and photovoltaic capacity configuration options;

[0165] F m is the wind and solar power curtailment rate of the mth hydropower or pumped storage power station and wind power and photovoltaic capacity configuration scheme;

[0166] T is the length of a year, i.e. 8760 hours (24*365=8760);

[0167] Δt is the step length of the calculation period;

[0168] They are the wind and solar output abandoned in period t for the mth pumped storage power station and the wind and photovoltaic capacity configuration schemes;

[0169] are the total wind power and photovoltaic power generation outputs of the mth pumped storage power station and the wind power and photovoltaic capacity configuration schemes in period t;

[0170] F is the given threshold of wind-solar curtailment rate of the combined system, which is 5%;

[0171] H m The number of hours of access to the grid for the configuration scheme of the mth pumped storage power station with wind power and photovoltaic capacity;

[0172] are the wind power, photovoltaic, hydropower, and pumped storage grid-connected outputs in period t of the mth hydropower or pumped storage power station and the wind power and photovoltaic capacity configuration schemes;

[0173] P m The system access capacity for the mth hydropower or pumped storage power station and wind power and photovoltaic capacity configuration scheme;

[0174] H is the given Internet access channel utilization hours threshold, which is 5000h.

[0175] B. Constraints;

[0176] ① Pumped storage power station capacity constraints:

[0177] The capacity selection of pumped storage power stations is limited by two factors: first, the construction conditions of the site itself, and second, the wind power and photovoltaic resources that can be matched around the site. The capacity constraints are:

[0178]

[0179] ② Hydropower station capacity constraints:

[0180] The capacity selection of hydropower stations is limited by two factors: first, the installed capacity of the power stations that have been built or planned, and second, the wind power and photovoltaic resources that can be matched around the hydropower stations. The capacity constraints are:

[0181]

[0182] ③ Wind power and photovoltaic capacity constraints:

[0183] The restrictions on wind power and photovoltaic capacity selection are mainly related to the wind and solar resources around the hydropower station or pumped storage site. The capacity constraints are:

[0184]

[0185] ④ Transmission channel capacity constraints:

[0186] The limitation of transmission channel capacity will result in different transmission channel utilization efficiencies of different combined system schemes.

[0187] P min ≤P m ≤P max ;

[0188] Where:

[0189] The installed capacity of the pumped storage power station for the mth pumped storage power station with wind power and photovoltaic capacity configuration scheme;

[0190] The minimum and maximum installed capacity of the selected pumped storage sites in the system;

[0191] The installed capacity of the pumped storage power station for the mth hydropower station with wind power and photovoltaic capacity configuration scheme;

[0192] The minimum and maximum installed capacity of the hydropower stations selected in the system;

[0193] They are the minimum and maximum installed capacity of wind power in the system respectively;

[0194] They are the minimum and maximum installed PV capacity in the system, respectively;

[0195] P m The access capacity of the m-th pumped storage power station with wind power and photovoltaic capacity configuration scheme;

[0196] P min , P maxThey are the minimum and maximum capacities of the transmission access channel in the joint system with different capacity configuration schemes.

[0197] (5.3) Lower layer optimization model;

[0198] A. Objective function: Minimize the volatility of combined power generation output;

[0199] Under the configuration of different pumped storage power stations, wind power and photovoltaic capacity configuration schemes given by the upper layer, the combined system can smooth the short-term random fluctuations of photovoltaic and wind power through the regulation of hydropower or pumped storage power stations. Considering the long-distance power transmission of the water-wind-solar-storage combined system, it is not suitable to bear the peak load of the receiving power grid. The optimization objective function with the minimum fluctuation of the combined power generation output is proposed:

[0200]

[0201] Where:

[0202] f is the variance of the combined power generation output;

[0203] Provide power generation for the combined power generation system;

[0204] To calculate the average value of the combined power generation output during the operation cycle;

[0205] is the pumped storage pumping output of the mth pumped storage power station in time period t for the configuration scheme of wind power and photovoltaic capacity;

[0206] The hydropower grid-connected output in period t of the mth hydropower, wind power and photovoltaic capacity configuration scheme;

[0207] The remaining symbols are the same as above.

[0208] B. Constraints;

[0209] ①Electricity balance constraints of pumped storage power stations:

[0210]

[0211] ②Grid transmission power limit:

[0212] Due to the limitations of the grid's transmission capacity and in order to reduce the volatility of wind and photovoltaic power generation, the output power of the combined system is limited to a certain range.

[0213]

[0214] ③Reservoir energy storage constraints:

[0215]

[0216]

[0217] ④ Storage capacity constraints:

[0218]

[0219] When the pumped storage power station generates electricity, the change in storage capacity of the upper reservoir is:

[0220]

[0221] When the pumped storage power station pumps water, the change in storage capacity of the upper reservoir is:

[0222]

[0223] ⑤ Constraints on power generation and pumping output of pumped storage power stations:

[0224] Since the currently more mature pumped-storage power station units are mainly fixed-speed units, the power of each unit is basically fixed when pumping water. Therefore, the wind and solar power output used for pumping water needs to match the rated pumping power of each unit.

[0225]

[0226] ⑥ Pumped storage pumping conditions and power generation conditions cannot be constrained at the same time:

[0227]

[0228] ⑦Hydropower output constraints:

[0229] Since some hydropower stations also undertake other comprehensive utilization tasks such as flood control, water supply, ecology and shipping, the power generation output of the power stations will be limited by these comprehensive utilization tasks.

[0230]

[0231] ⑧ Daily hydropower balance constraints:

[0232]

[0233] ⑨ Wind power and photovoltaic output constraints:

[0234]

[0235] Where:

[0236] The pumping output of the pumped storage power station in period t for the mth pumped storage power station and the wind power and photovoltaic capacity configuration scheme;

[0237] They represent the minimum and maximum values ​​of hydropower, wind power, and solar power storage output that the transmission line of the mth capacity configuration scheme can accept respectively;

[0238] are the minimum and maximum energy storage values ​​of the upper pumped storage reservoir of the mth capacity configuration scheme, respectively;

[0239] E m (t), E m (t+1) represents the energy storage value of the pumped storage power station at time t and t+1 for the mth capacity configuration scheme;

[0240] η p , η h They are the pumping and power generation efficiencies of pumped storage power stations, respectively;

[0241] are the minimum and maximum storage capacities of the upper reservoir of the pumped storage power station in the mth capacity configuration scheme;

[0242] V m (t), V m (t+1) are the storage capacities of the upper reservoir of the pumped storage power station at time t and t+1 of the mth capacity configuration scheme;

[0243] H ft , H ct They are power generation and pumping head of pumped storage power station;

[0244] are the minimum and maximum power output of the pumped storage power station respectively;

[0245] are the minimum and maximum values ​​of the pumped output of the pumped storage power station, respectively;

[0246] The wind power and photovoltaic power are used for the remaining output of the pumped storage power station after pumping water in the mth capacity configuration scheme;

[0247] P p-pump It is the rated pumping power of a single unit in a pumped-storage power station;

[0248] n is the unit number of the pumped storage power station;

[0249] N is the total number of units in the pumped storage power station;

[0250] They are the minimum and maximum power generation output after comprehensive utilization of hydropower taking into account ecological flow and flood control limit water level;

[0251] is the average daily output of hydropower in the complementary system;

[0252] I is the total number of time periods per day, which is 24 hours;

[0253] They are the maximum power generation output of wind power and photovoltaic power respectively.

[0254] The optimization algorithm described in step 7 is a progressive optimization algorithm (POA), which uses the free and open source eclipse platform for self-programming modeling and solving, and finally obtains the optimal capacity configuration scheme of the water-wind-solar-storage complementary system and the output process of each power source under the scheme.

[0255] It should be understood that the specific order or hierarchy of steps in the process disclosed by the present invention is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims provide the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0256] The present invention also relates to a capacity configuration system for a water, wind, solar and storage multi-energy complementary clean energy base, including a data collection module, a basic principle and boundary condition formulation module, an output process simulation module, a restriction condition determination module, an output process calculation restriction module, a double-layer nested optimization model construction module, and an optimal capacity configuration solution solution module.

[0257] Data collection module, used to collect basic data related to hydropower stations, wind power, photovoltaics, pumped storage and transmission lines in the study area;

[0258] Formulate basic principles and boundary conditions module, which is used to formulate the basic principles of water, wind, solar and storage resource allocation research and the boundary conditions of joint and complementary operation;

[0259] The output simulation module is used to simulate the hourly output process of wind and solar power;

[0260] The module for determining the restriction conditions is used to analyze and determine the wind and solar power abandonment rate, the annual utilization hours of the comprehensive access channel of the transmission channel, the comprehensive utilization demand of the reservoir and the pumping power limit of the pumped storage power station;

[0261] Calculation limit output process module, used for runoff regulation calculation generation considering comprehensive utilization limit output process;

[0262] Construct a double-layer nested optimization model module to construct a double-layer nested optimization model for capacity configuration of a water, wind, solar and storage multi-energy complementary clean energy base;

[0263] The module for solving the optimal capacity configuration scheme is used to solve the model using an optimization algorithm to obtain the optimal capacity configuration scheme of the clean energy base and the output process of each power source under the capacity configuration scheme.

[0264] The two-layer nested optimization model is composed of an upper optimization model and a lower optimization model. The upper optimization model solves the problem of pumped storage, wind power and photovoltaic capacity configuration, and provides a planning scheme for pumped storage power stations, wind power and photovoltaic capacity for the lower layer; the lower optimization model solves the problem of joint operation of pumped storage, wind power and photovoltaics, and outputs a stable external output through the energy storage regulation function of the pumped storage power station.

[0265] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0266] This example takes a hydropower station, pumped storage power station and surrounding exploitable wind and solar resources in a certain river basin as an example. Figure 1 As shown, a method for configuring the capacity of a water, wind, solar and storage clean energy base considering the comprehensive utilization of hydropower and the constraints of pumping power is provided. The specific implementation steps are as follows:

[0267] (1) Collect the long-series runoff process of the hydropower station, the ecological flow discharge process, the power generation characteristic curve of the hydropower station, the installed capacity, characteristic water level and other water energy parameters, and the flow or water level constraints of the reservoir flood control, water supply, and navigation; collect the historical measured 8760-hour output process of the built wind farms and photovoltaic power stations in the study area, wind and light measurement data, and the upper limit of the scale of wind and solar resource development in the region; collect the resource scale of pumped storage power stations in the study area, installed capacity, characteristic water level and other water energy parameters; collect the capacity limit of the transmission line channel, the historical number of hours of power grid channel utilization, and the upper limit of the wind and solar power abandonment rate of the power grid.

[0268] (2) Formulate the basic principles for the research on the allocation of water, wind, solar and storage resources and the main boundary conditions for the joint complementary operation. The basic principles of the allocation plan for the water, wind, solar and storage multi-energy complementary clean energy base include that wind and solar resources should be connected to the nearest hydropower station or pumped storage power station, making full use of the hydropower transmission channel and the energy storage function of the pumped storage power station; using the flexible adjustment performance of hydropower and pumped storage power stations to cooperate with the wind and solar complementary operation to minimize the wind and solar abandonment rate; giving priority to using hydropower to consume wind and solar power, and when the capacity of the hydropower transmission channel is insufficient, considering adding pumped storage power stations to complement the wind and solar operation; hydropower stations and pumped storage power stations are considered complementary on a daily time scale; the wind and solar ratio is initially determined according to the ratio of the final scale of wind and solar resources.

[0269] (3) Taking the ten-day time scale as the calculation period, long-term inflow runoff data are used to calculate runoff regulation. After considering the comprehensive utilization restrictions of power stations such as flood control, water supply, and shipping, the hydropower output process in each period is obtained (see Figure 2 ), and determine the upper and lower limits of hydropower output. Taking into account that hydropower output can be adjusted during the day, the ten-day hydropower output process is used as a complementary operating parameter for the non-adjustable wind and solar power output in hourly periods.

[0270] (4) All the existing and planned wind power and photovoltaic power stations in the study area are regarded as a virtual wind power station and a virtual photovoltaic power station respectively. The 8760-hour output process of the virtual wind farm and virtual photovoltaic power station is simulated based on the wind and light measurement data and the historical measured 8760-hour output process (see Figure 3 and Figure 4 ).

[0271] (5) Hydropower, wind, solar and storage multi-energy complementary clean energy bases usually use the transmission lines of existing or planned hydropower stations and pumped storage power stations to access the power grid, and are therefore subject to the capacity and annual utilization hours of the transmission channels. The upper limit of the base's transmission capacity and annual utilization hours should be determined based on the characteristics of the transmission channels of the hydropower, wind, solar and storage multi-energy complementary clean energy bases. The upper limit of the wind and solar power abandonment rate should be determined based on the grid's requirements for wind and solar power grid connection.

[0272] (6) A two-layer nested optimization model for capacity configuration of a water, wind, solar and storage multi-energy complementary clean energy base was constructed. The optimization model consists of an objective function and constraint adjustment.

[0273] (6.1) Upper layer optimization model;

[0274] A. Objective function: When the number of hours of access to the Internet is not less than a certain threshold and the wind and photovoltaic abandonment rate of the joint system is not higher than a certain threshold, the scale of the new energy base with multiple complementary energies of water, wind, solar and storage is the largest;

[0275]

[0276] Where:

[0277] P is the scale of the new energy base with multiple complementary energies of water, wind, solar and storage;

[0278] are the installed capacities of pumped storage, hydropower, wind power and photovoltaic power for the mth capacity configuration scheme, respectively;

[0279] m is the number of the hydropower or pumped storage power station and wind power and photovoltaic capacity configuration plan;

[0280] M is the total number of hydropower or pumped storage power stations and wind power and photovoltaic capacity configuration options;

[0281] F m is the wind and solar power curtailment rate of the mth hydropower or pumped storage power station and wind power and photovoltaic capacity configuration scheme;

[0282] T is the length of a year, i.e. 8760 hours (24*365=8760);

[0283] Δt is the step length of the calculation period;

[0284] They are the wind and solar output abandoned in period t for the mth pumped storage power station and the wind and photovoltaic capacity configuration schemes;

[0285] are the total wind power and photovoltaic power generation outputs of the mth pumped storage power station and the wind power and photovoltaic capacity configuration schemes in period t;

[0286] F is the given threshold of wind-solar curtailment rate of the combined system, which is 5%;

[0287] H m The number of hours of access to the grid for the configuration scheme of the mth pumped storage power station with wind power and photovoltaic capacity;

[0288] are the wind power, photovoltaic, hydropower, and pumped storage grid-connected outputs in period t of the mth hydropower or pumped storage power station and the wind power and photovoltaic capacity configuration schemes;

[0289] P m The system access capacity for the mth hydropower or pumped storage power station and wind power and photovoltaic capacity configuration scheme;

[0290] H is the given Internet access channel utilization hours threshold, which is 5000h.

[0291] B. Constraints;

[0292] ① Pumped storage power station capacity constraints:

[0293]

[0294] ② Hydropower station capacity constraints:

[0295]

[0296] ③ Wind power and photovoltaic capacity constraints:

[0297]

[0298]

[0299] ④ Transmission channel capacity constraints:

[0300] P min ≤P m ≤P max ;

[0301] Where:

[0302] The installed capacity of the pumped storage power station for the mth pumped storage power station and wind power and photovoltaic capacity configuration scheme;

[0303] The minimum and maximum installed capacity of the selected pumped storage sites in the system;

[0304] The installed capacity of the pumped storage power station for the mth hydropower station and wind power and photovoltaic capacity configuration scheme;

[0305] The minimum and maximum installed capacity of the hydropower stations selected in the system;

[0306] They are the minimum and maximum installed capacity of wind power in the system respectively;

[0307] They are the minimum and maximum installed PV capacity in the system, respectively;

[0308] P m is the access capacity of the mth pumped storage power station and the wind power and photovoltaic capacity configuration scheme;

[0309] P min , P max They are the minimum and maximum values ​​of the transmission channel capacity in the joint system with different capacity configuration schemes.

[0310] (6.2) Lower layer optimization model;

[0311] A. Objective function: Minimize the volatility of combined power generation output:

[0312]

[0313] Where:

[0314] f is the variance of the combined power generation output;

[0315] Provide power generation for the combined power generation system;

[0316] To calculate the average value of the combined power generation output during the operation cycle;

[0317] is the pumped storage pumping output in period t for the mth pumped storage power station with wind power and photovoltaic capacity configuration scheme;

[0318] The hydropower grid-connected output in period t of the mth hydropower, wind power and photovoltaic capacity configuration scheme;

[0319] The remaining symbols are the same as above.

[0320] B. Constraints;

[0321] ①Electricity balance constraints of pumped storage power stations:

[0322]

[0323] ②Grid transmission power limit:

[0324]

[0325] ③Reservoir energy storage constraints:

[0326]

[0327]

[0328] ④ Storage capacity constraints:

[0329]

[0330] When the pumped storage power station generates electricity, the change in storage capacity of the upper reservoir is:

[0331]

[0332] When the pumped storage power station pumps water, the change in storage capacity of the upper reservoir is:

[0333]

[0334] ⑤ Constraints on power generation and pumping output of pumped storage power stations:

[0335]

[0336] ⑥ Pumped storage pumping conditions and power generation conditions cannot be constrained at the same time:

[0337]

[0338] ⑦Hydropower output constraints:

[0339]

[0340] ⑧ Daily hydropower balance constraints:

[0341]

[0342] ⑨ Wind power and photovoltaic output constraints

[0343]

[0344] Where:

[0345] The pumping output of the pumped storage power station in period t of the mth pumped storage power station and the wind power and photovoltaic capacity configuration scheme;

[0346] They represent the minimum and maximum values ​​of hydropower, wind power, and solar power storage output that the transmission line of the mth capacity configuration scheme can accept respectively;

[0347] are the minimum and maximum energy storage values ​​of the upper pumped storage reservoir of the mth capacity configuration scheme, respectively;

[0348] E m (t), E m (t+1) represents the energy storage value of the pumped storage power station at time t and t+1 for the mth capacity configuration scheme;

[0349] η p , η h They are the pumping and power generation efficiencies of pumped storage power stations, respectively;

[0350] are the minimum and maximum storage capacities of the upper reservoir of the pumped storage power station in the mth capacity configuration scheme;

[0351] V m (t), V m (t+1) are the storage capacities of the upper reservoir of the pumped storage power station at time t and t+1 of the mth capacity configuration scheme;

[0352] H ft , H ct They are power generation and pumping head of pumped storage power station;

[0353] are the minimum and maximum power output of the pumped storage power station respectively;

[0354] are the minimum and maximum values ​​of the pumped output of the pumped storage power station, respectively;

[0355] They are the remaining output of wind power and photovoltaic power after pumping water in the mth capacity configuration scheme;

[0356] P p-pump It is the rated pumping power of a single unit in a pumped-storage power station;

[0357] n is the unit number of the pumped storage power station;

[0358] N The number of units in the pumped storage power station;

[0359] They are the minimum and maximum power generation output after comprehensive utilization of hydropower taking into account ecological flow and flood control limit water level;

[0360] is the average daily output of hydropower in the complementary system;

[0361] I is the total number of time periods per day, which is 24 hours;

[0362] They are the maximum power generation output of wind power and photovoltaic power respectively.

[0363] (7) The wind and solar resource scale and hydropower and pumped storage power station installed capacity and other water energy parameters obtained in step 1, the output process of each hydropower station obtained in step 2, the wind and solar output process obtained in step 3, the transmission channel capacity obtained in step 4, the range of channel utilization hours, and the basic principles of the water-wind-solar-storage multi-energy complementary clean energy base configuration plan in step 6 are used as input parameters of the water-wind-solar-storage multi-energy complementary clean energy base capacity configuration double-layer nested optimization model constructed in step 7. The optimization algorithm is used to solve the model to obtain the optimal capacity configuration plan of the complementary system: the total scale of the multi-energy complementary clean energy base is 14450MW, including 4070MW of hydropower, 5370MW of wind power, 4610MW of photovoltaic power, and 400MW of pumped storage power station. The output process of each power source combined operation on a typical day under this plan is calculated (see Figure 5 , Figure 6 ), the calculation results are as follows: the annual utilization hours of the transmission channel are 5137 hours; the total on-grid power of the multi-energy complementary clean energy base is 27.328 billion kWh, of which wind power on-grid power is 9.44 billion kWh, photovoltaic power on-grid power is 4.352 billion kWh, and hydropower on-grid power is 13.007 billion kWh; the on-grid power of the pumped storage power station is 528 million kWh (pumped power is 704 million kWh); the total wind and solar power abandonment rate is 4.85%. Thus, the optimal capacity configuration plan of the clean energy base and the output process of each power source under the capacity configuration plan are completed.

[0364] The present invention takes into account the impact of reservoir flood control, water supply, ecology, shipping needs and the pumping power of pumped-storage power stations on the capacity configuration plan of water-wind-solar-storage clean energy bases. On the premise of absorbing the wind, solar and power output of the base as much as possible and transmitting it stably, the output characteristics of each power source participating in the operation of the complementary system are analyzed, and a capacity configuration model of the water-wind-solar-storage clean energy base is established. The optimization algorithm is used to solve it, and the optimal capacity configuration plan of the water-wind-solar-storage clean energy base considering the comprehensive utilization of hydropower and the constraints of pumping power is obtained. This can provide technical support for the planning, development and construction of water-wind-solar-storage clean energy bases in a river basin or region, effectively enhance the wind and solar power absorption capacity of hydropower stations and pumped-storage power stations, reduce the wind and solar power abandonment rate of the power grid, and ensure the safe and stable operation of the power grid and the smooth realization of my country's energy conservation and emission reduction goals.

[0365] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A capacity configuration method for a water, wind, solar and storage multi-energy complementary clean energy base, characterized by: The following steps are included: Collect basic information on hydropower stations, wind power, photovoltaics, pumped storage and transmission lines in the study area; Formulate basic principles for the study of water, wind, solar and storage resource allocation and boundary conditions for joint and complementary operation; Simulate the hourly output process of wind and solar power; Analyze and determine the wind and solar power curtailment rate, the annual utilization hours of the comprehensive access channel of the transmission channel, the comprehensive utilization demand of the reservoir and the pumping power limit of the pumped storage power station; Runoff regulation calculation generation takes into account the comprehensive utilization of the limiting output process; Construct a double-layer nested optimization model for capacity configuration of water, wind, solar and storage multi-energy complementary clean energy base; The optimization algorithm is used to solve the model to obtain the optimal capacity configuration plan of the clean energy base and the output process of each power source under this capacity configuration plan.

2. The method for configuring the capacity of a water, wind, solar and storage multi-energy complementary clean energy base according to claim 1 is characterized by: The basic principles include considering the safe and stable operation requirements of hydropower stations, pumped storage power stations, power grids, and transmission channels; Wind and solar resources should be connected to the nearest hydropower station or pumped-storage power station to make full use of the hydropower transmission channels and the energy storage function of the pumped-storage power station; make full use of the flexible adjustment performance of hydropower and pumped-storage power stations to coordinate with the complementary operation of wind and solar, promote the consumption of wind and solar, and reduce the abandonment rate of wind and solar.

3. The method for configuring the capacity of a water, wind, solar and storage multi-energy complementary clean energy base according to claim 2 is characterized by: The boundary conditions include using the capacity of the hydropower supporting transmission channel as the maximum transmission capacity to control the complementarity of water, wind and solar power. When the capacity of the hydropower transmission channel is insufficient, considering adding new pumped-storage power stations to complement the wind and solar power, and re-planning the additional transmission capacity and scale; combining the characteristics of new energy output and the regulation capabilities of hydropower and pumped storage, hydropower stations and pumped-storage power stations are considered to be complementary on a daily time scale; hydropower and pumped-storage power stations smooth the fluctuations in new energy output; the proportion of wind and solar power is initially determined according to the proportion of the final scale of wind and solar resources.

4. The method for configuring the capacity of a water, wind, solar and storage multi-energy complementary clean energy base according to claim 1 is characterized by: The simulation of the hourly wind and solar power output process specifically includes the following steps: Combined with the wind resource data of the wind farm in the study area, a computational fluid dynamics model was established for the entire wind farm to simulate the resource situation of the wind farm and the output process of 8760 hours throughout the year; Combined with the collected solar radiation database of the research area, photovoltaic simulation software was used to build a model and simulate the output process of the photovoltaic power station for 8760 hours a year.

5. The method for configuring the capacity of a water, wind, solar and storage multi-energy complementary clean energy base according to claim 1 is characterized by: The determination of the wind and solar power abandonment rate, the annual utilization hours of the comprehensive access channel of the transmission channel, the comprehensive utilization demand of the reservoir and the pumping power limit of the pumped storage power station specifically includes the following steps: The total wind and solar power abandonment rate is no more than 5% and the annual utilization hours of the transmission capacity channel are no less than 5000h as the limit of the actual output process of wind power and photovoltaic power in the complementary system. If the limit is exceeded, the wind power and photovoltaic power grid output allocation principle will be re-established; According to the comprehensive utilization requirements of flood control limit water level or ecological flow of each reservoir, the water is divided into several time periods according to the monthly / ten-day time scale, and the corresponding hydropower station's limited output to maintain the downstream ecological flow or flood control limit water level is calculated. Then, the monthly / ten-day hydropower limited output is extended and applied to the hydropower complementary operation with hourly steps, generating the 8760-hour limited output process of the hydropower station throughout the year; According to the single-unit capacity of each unit in the pumped-storage power station and the requirements for the pumping power of the fixed-speed units, when the base wind and photovoltaic power is used as the pumping power source of the pumped-storage power station, the output limit of wind and photovoltaic power as the pumped power source is generated according to the pumping power of different numbers of units.

6. The method for configuring the capacity of a water, wind, solar and storage multi-energy complementary clean energy base according to claim 1 is characterized by: The two-layer nested optimization model is composed of an upper optimization model and a lower optimization model. The upper optimization model solves the problem of pumped storage, wind power and photovoltaic capacity configuration, and provides a planning scheme for pumped storage power stations, wind power and photovoltaic capacity for the lower layer; the lower optimization model solves the problem of joint operation of pumped storage, wind power and photovoltaics, and outputs a stable external output through the energy storage regulation function of the pumped storage power station.

7. The method for configuring the capacity of a water, wind, solar and storage multi-energy complementary clean energy base according to claim 6 is characterized by: The upper optimization model includes objective functions and constraints, which are as follows: A. Objective function: When the annual utilization hours of the access channel are not less than a certain threshold and the wind and photovoltaic abandonment rate of the joint system is not higher than a certain threshold, the scale of the hydro-wind-solar-storage multi-energy complementary new energy base is the largest; Where: P is the scale of the new energy base with multiple complementary energies of water, wind, solar and storage; are the installed capacities of pumped storage, hydropower, wind power and photovoltaic power for the mth capacity configuration scheme, respectively; m is the number of the hydropower or pumped storage power station and wind power and photovoltaic capacity configuration plan; M is the total number of hydropower or pumped storage power stations and wind power and photovoltaic capacity configuration options; F m is the wind and solar power curtailment rate of the mth hydropower or pumped storage power station and wind power and photovoltaic capacity configuration scheme; T is the length of a year, i.e. 8760h; Δt is the step length of the calculation period; They are the wind and solar output abandoned in period t for the mth pumped storage power station and the wind and photovoltaic capacity configuration schemes; are the total wind power and photovoltaic power generation outputs of the mth pumped storage power station and the wind power and photovoltaic capacity configuration schemes in period t; F is the given threshold of wind-solar curtailment rate of the combined system, which is 5%; H m The number of hours of access to the grid for the configuration scheme of the mth pumped storage power station with wind power and photovoltaic capacity; are the wind power, photovoltaic, hydropower, and pumped storage grid-connected outputs in period t of the mth hydropower or pumped storage power station and the wind power and photovoltaic capacity configuration schemes; P m The system access capacity for the mth hydropower or pumped storage power station and wind power and photovoltaic capacity configuration scheme; H is the threshold of the number of hours of Internet access utilization, which is 5000 hours; B. Constraints; Capacity constraints of pumped storage power stations: Hydropower station capacity constraints: Wind power and photovoltaic capacity constraints: Transmission channel capacity constraints: P min ≤P m ≤P max ; Where: The installed capacity of the pumped storage power station for the mth pumped storage power station with wind power and photovoltaic capacity configuration scheme; The minimum and maximum installed capacity of the selected pumped storage sites in the system; The installed capacity of the pumped storage power station for the mth hydropower station with wind power and photovoltaic capacity configuration scheme; The minimum and maximum installed capacity of the hydropower stations selected in the system; They are the minimum and maximum installed capacity of wind power in the system respectively; They are the minimum and maximum installed PV capacity in the system, respectively; P m The access capacity of the m-th pumped storage power station with wind power and photovoltaic capacity configuration scheme; P min , P max They are the minimum and maximum capacities of the transmission access channel in the joint system with different capacity configuration schemes.

8. The method for configuring the capacity of a water, wind, solar and storage multi-energy complementary clean energy base according to claim 7 is characterized by: The lower optimization model includes an objective function and constraints, which are as follows: A. Objective function: Minimize the volatility of combined power generation output; Under the configuration of different pumped storage power stations, wind power and photovoltaic capacity configuration schemes given by the upper layer, the combined system can smooth the short-term random fluctuations of photovoltaic and wind power through the regulation of hydropower or pumped storage power stations. Considering the long-distance power transmission of the water-wind-solar-storage combined system, it is not suitable to bear the peak load of the receiving power grid. The optimization objective function with the minimum fluctuation of the combined power generation output is proposed: Where: f is the variance of the combined power generation output; Provide power generation for the combined power generation system; To calculate the average value of the combined power generation output during the operation cycle; is the pumped storage pumping output in period t for the mth pumped storage power station with wind power and photovoltaic capacity configuration scheme; The hydropower grid-connected output in period t of the mth hydropower, wind power and photovoltaic capacity configuration scheme; B. Constraints; Power balance constraints of pumped storage power stations: Grid transmission power limit: Reservoir storage constraints: Storage capacity constraints: When the pumped storage power station generates electricity, the change in storage capacity of the upper reservoir is: When the pumped storage power station pumps water, the change in storage capacity of the upper reservoir is: Constraints on power generation and pumping output of pumped storage power stations: Pumped storage pumping conditions and power generation conditions cannot be constrained at the same time: Hydropower output constraints: Constraints on daily hydropower balance: Wind power and photovoltaic output constraints: Where: The pumping output of the pumped storage power station in period t for the mth pumped storage power station and the wind power and photovoltaic capacity configuration scheme; They represent the minimum and maximum values ​​of hydropower, wind power, and solar power storage output that the transmission line of the mth capacity configuration scheme can accept respectively; are the minimum and maximum energy storage values ​​of the upper pumped storage reservoir of the mth capacity configuration scheme, respectively; E m (t), E m (t+1) represents the energy storage value of the pumped storage power station at time t and t+1 for the mth capacity configuration scheme; η p , η h They are the pumping and power generation efficiencies of pumped storage power stations, respectively; are the minimum and maximum storage capacities of the upper reservoir of the pumped storage power station in the mth capacity configuration scheme; V m (t), V m (t+1) are the storage capacities of the upper reservoir of the pumped storage power station at time t and t+1 of the mth capacity configuration scheme; H ft , H ct They are power generation and pumping head of pumped storage power station; are the minimum and maximum power output of the pumped storage power station respectively; are the minimum and maximum values ​​of the pumped output of the pumped storage power station, respectively; The wind power and photovoltaic power are used for the remaining output of the pumped storage power station after pumping water in the mth capacity configuration scheme; P p-pump It is the rated pumping power of a single unit in a pumped-storage power station; n is the unit number of the pumped storage power station; N is the total number of units in the pumped storage power station; They are the minimum and maximum power generation output after comprehensive utilization of hydropower taking into account ecological flow and flood control limit water level; is the average daily output of hydropower in the complementary system; I is the total number of time periods per day, which is 24 hours; They are the maximum power generation output of wind power and photovoltaic power respectively.

9. A capacity configuration system for a water, wind, solar and storage multi-energy complementary clean energy base, characterized by: It includes data collection module, basic principle and boundary condition formulation module, output process simulation module, restriction condition determination module, output process calculation module, double-layer nested optimization model construction module, and optimal capacity configuration solution module. Data collection module, used to collect basic data related to hydropower stations, wind power, photovoltaics, pumped storage and transmission lines in the study area; Formulate basic principles and boundary conditions module, which is used to formulate the basic principles of water, wind, solar and storage resource allocation research and the boundary conditions of joint and complementary operation; The output simulation module is used to simulate the hourly output process of wind and solar power; The module for determining the restriction conditions is used to analyze and determine the wind and solar power abandonment rate, the annual utilization hours of the comprehensive access channel of the transmission channel, the comprehensive utilization demand of the reservoir and the pumping power limit of the pumped storage power station; Calculation limit output process module, used for runoff regulation calculation generation considering comprehensive utilization limit output process; Construct a double-layer nested optimization model module to construct a double-layer nested optimization model for capacity configuration of a water, wind, solar and storage multi-energy complementary clean energy base; The module for solving the optimal capacity configuration scheme is used to solve the model using an optimization algorithm to obtain the optimal capacity configuration scheme of the clean energy base and the output process of each power source under the capacity configuration scheme.

10. A water, wind, solar and storage multi-energy complementary clean energy base capacity configuration system according to claim 9, characterized in that: The two-layer nested optimization model is composed of an upper optimization model and a lower optimization model. The upper optimization model solves the problem of pumped storage, wind power and photovoltaic capacity configuration, and provides a planning scheme for pumped storage power stations, wind power and photovoltaic capacity for the lower layer; the lower optimization model solves the problem of joint operation of pumped storage, wind power and photovoltaics, and outputs a stable external output through the energy storage regulation function of the pumped storage power station.

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