Power complementary dispatching calculation method for energy storage-wind power-photovoltaic energy system

Abstract

The present invention belongs to the multi-energy complementarity field and the power system planning technology field. Provided is a power complementary dispatching calculation method for an energy storage-wind power-photovoltaic energy system. In the present invention, calculation is performed within a regulation cycle, and is mainly divided into inner and outer loops for execution, wherein the outer loop is to solve for an initial energy storage capacity, and the inner loop is mainly to solve for a maximum load within the regulation cycle; on the basis of the obtained values, the hourly power generation outputs of energy storage, wind power and photovoltaic power under a power transmission load and within the remaining channel capacity during the regulation cycle, and also the charging output of energy storage and the curtailment outputs of wind power and photovoltaic power, can be further obtained; and power quantity indicators can be obtained by means of compiling statistics thereon. The method of the present invention fully takes into account the load characteristics of a receiving-end power grid, and complementary power transmission is prioritized to meet such load characteristics. On this basis, surplus power is transmitted by means of the remaining channel capacity, giving full play to the peak-regulating and energy-storage functions of energy storage. Thus, while satisfying the load characteristics, the wind and photovoltaic power outputs are absorbed to the greatest extent.

Description

A power complementary dispatching calculation method of energy storage wind power photovoltaic energy system TECHNICAL FIELD

[0001] The present application belongs to the field of multi-energy complementation and the technical field of power system planning, and particularly relates to a power complementary dispatching calculation method of energy storage wind power photovoltaic energy system. BACKGROUND

[0002] Currently, the renewable energy planning mainly takes the river basin wind and light as the main body, and in some regions, there is no hydropower but rich new energy resources, which can rely on pumped storage or electrochemical energy storage and other energy storage power stations as supporting regulation power sources, so as to complementarily develop the energy storage, wind power and photovoltaic energy system, and is suitable for the development of energy bases in Shagehuang and other regions, and is suitable for the application of microgrids such as comprehensive energy systems and incremental distribution networks, and is an important mode of new energy development.

[0003] The power complementary dispatching calculation of the energy system is a key work of power supply configuration and specific power scale demonstration, and mainly provides the complementary power supply process and power indicators of the energy system. For the complementary development mode of energy storage, wind power and photovoltaic, the power complementary dispatching should fully consider the load characteristics of the receiving end power grid or microgrid, and also should consider the power transmission capacity of the channel capacity.

[0004] However, the current energy storage-wind power-photovoltaic complementary dispatching calculation method is relatively less, and the load characteristics of the power grid are not fully considered. In view of this, it is necessary to propose a new power complementary dispatching calculation method of energy storage wind power photovoltaic energy system. SUMMARY

[0005] The present application provides a power complementary dispatching calculation method of energy storage wind power photovoltaic energy system, which aims to fully consider the load characteristics of the receiving end power grid, complementarily supply power to preferentially meet the load characteristics, and on this basis, utilize the remaining space of the channel capacity to transport the remaining power, fully play the peak regulation role and energy storage role of the energy storage, and absorb the wind and light output as much as possible on the basis of meeting the load characteristics.

[0006] To achieve the above technical purposes, the present application provides the following technical solutions:

[0007] The application discloses a power complementary dispatching calculation method for an energy storage wind power photovoltaic energy system, and the method is calculated in a regulation period, and comprises the following steps: assuming initial energy storage power according to energy storage scale and hours, assuming maximum load according to channel capacity on the basis, combining hourly load unit value to obtain hourly power transmission load; further combining initial wind power hourly output and initial photovoltaic hourly output to calculate photovoltaic power generation output under load, wind power generation output under load, energy storage power generation output required for top load and energy storage power generation output required for wind and light charging, combining energy storage charging and power generation conversion efficiency to calculate energy storage power required to be left in reverse sequence; further combining energy storage power required to be left, energy storage power in each hour to calculate energy storage power generation output under load, actual energy storage power generation output required for wind and light charging and residual space energy storage power generation output, obtaining energy storage power in the last period according to the calculation result; combining hourly power transmission load, wind power generation output under load, photovoltaic power generation output under load and energy storage power generation output under load to judge whether power transmission load and power generation output under load are balanced in power and power, if not, re-assuming maximum load to calculate until the maximum load satisfying the balance of power and power is obtained, and obtaining hourly power generation output of power under load in combination with the energy storage power in the last period, then judging whether the energy storage power is balanced, if not, re-assuming initial energy storage power to calculate until the initial energy storage power satisfying the balance of energy storage power is obtained; based on the obtained maximum load and initial energy storage power, residual space wind power generation output, residual space photovoltaic power generation output, wind power abandoned output and photovoltaic power abandoned output in the regulation period are obtained, and the power index can be obtained by counting the obtained result.

[0008] In the foregoing power complementary dispatching calculation method for the energy storage wind power photovoltaic energy system, the calculation formula of the hourly power transmission load obtained by combining the initial energy storage power, the maximum load assumed according to the channel capacity and the hourly load unit value is as follows: Tload i = Load max · Load_curve i

[0009] In the formula, Tload i is the power transmission load in the i-th period, MW; Load max is the maximum load, MW; and Load_curve i is the load unit value in the i-th period.

[0010] In the foregoing power complementary dispatching calculation method for the energy storage wind power photovoltaic energy system, the calculation formula of the photovoltaic power generation output under load and the wind power generation output under load obtained by combining the initial wind power hourly output and the initial photovoltaic hourly output is as follows:

[0011] In the formula, WL iPVL i PV i PV i PV

[0012] The calculation formula of the energy storage wind power photovoltaic energy system power complementary dispatching method is as follows:

[0013] SNout i SNin i SNin

[0014] The calculation formula of the energy storage wind power photovoltaic energy system power complementary dispatching method is as follows:

[0015] If i = m, then ESN m = ES0

[0016] If 1≤i i+1 i i+1 i+1

[0017] If 1≤i i+1 i i+1 i

[0018] m is the number of time periods in the adjustment period, i.e., the last time period; ESM m is the required energy storage capacity in the last time period m, MWh; ES0 is the initial energy storage capacity, MWh; ESN i is the required energy storage capacity in the i-th time period, MWh; and a is the energy storage charging and generating conversion efficiency.

[0019] The calculation formula of the energy storage wind power photovoltaic energy system power complementary dispatching method is as follows:

[0020] ​​​​​​​If i = 1, then:

[0021] The energy storage power output under the load in the first period is: SLout1 = Min(NS, SNout1, ES0)

[0022] The actual wind and light charging output of the energy storage in the first period is:

[0023] If SLin1 > 0, the remaining space energy storage power output is: SEXout1 = 0

[0024] If SLin1 ≤ 0 and ES0 ≤ ESN1, the remaining space energy storage power output is: SEXout1 = 0

[0025] If SLin1 ≤ 0 and ES0 > ESN1, the remaining space energy storage power output is:

[0026] The energy storage power in the first period is: ES1 = ES0 + SLin1 × α - SLout1 - SEXout1

[0027] If 2 ≤ i ≤ m, then:

[0028] The energy storage power output under the load in the i period is: SLout i = Min(NS, SNout i , ES i-1 )

[0029] The actual wind and light charging output of the energy storage in the i period is:

[0030] If SLin i > 0, the remaining space energy storage power output is: SEXout i = 0

[0031] If SLin i ≤ 0 and ES i-1 ≤ ESN i , the remaining space energy storage power output is: SEXout i = 0

[0032] If SLin i ≤ 0 and ES i-1 > ESN i , the remaining space energy storage power output is:

[0033] The energy storage power in the first period is: ES i = ES i-1 + SLin i × α - SLout i-SEXout i

[0034] ③According to the proportion of the initial wind power output and the initial photovoltaic output, the wind power charging output and the photovoltaic charging output of the energy storage are calculated, which is specifically as follows:

[0035] In the formula: SLout i is the energy storage power generation output under the load of the i th period, MW; SLin i is the actual wind and light charging output of the energy storage in the i th period, MW; SEXout i is the remaining space energy storage power generation output in the i th period, MW; x, y, z, and v are intermediate conversion variables, MW; NS is the installed capacity of the energy storage power station, MW; H is the energy storage hours, h; NT is the channel capacity, MW; ES i is the energy storage power in the i th period, MWh; SLWin i is the wind power charging output of the energy storage in the i th period, MW; SLPVin i is the photovoltaic charging output of the energy storage in the i th period, MW.

[0036] In the foregoing power complementary dispatching calculation method of the energy storage wind power photovoltaic energy system, whether the power and energy are balanced under the load is judged by combining the hourly power transmission load, the wind power generation output under the load, the photovoltaic power generation output under the load, and the energy storage power generation output under the load, and the judgment is analyzed by using the power shortage cumulative value under the load. The power shortage cumulative value under the load is calculated by the following formula:

[0037] In the formula: Lmiss is the power shortage cumulative value under the load, MW;

[0038] If Lmiss>0, it indicates that the power and energy are unbalanced; the maximum load is assumed to be reduced, the assumed maximum load is taken as the upper limit value of the channel capacity and the lower limit value of 0, the calculation of the foregoing steps is repeated after each assumption of the maximum load, and the power and energy balance is judged again, and the maximum load is gradually approached by using the bisection method. When the assumed maximum load satisfies Lmiss=0 and the increase of the maximum load results in Lmiss>0, the maximum load satisfies the power and energy balance, and the maximum load is obtained. Based on the maximum load, the hourly power generation output of the power supply under the load can be obtained.

[0039] In the foregoing power complementary dispatching calculation method of the energy storage wind power photovoltaic energy system, whether the energy storage energy is balanced is judged by combining the energy storage energy in the last period. The calculation method is that the energy storage energy in the last period is calculated based on the obtained maximum load, and is compared with the assumed initial energy storage energy. If ES0>ES m, which indicates that the energy storage power is unbalanced; the initial energy storage power needs to be reduced when re-assuming the initial energy storage power, the assumed initial energy storage power is upper limited by the maximum energy storage power, that is, NSxH, and lower limited by 0, the calculation of the foregoing steps is repeated after assuming the initial energy storage power each time, and the energy storage power balance is judged again, and the bisection method is used to gradually approach the calculation, when the assumed initial energy storage power satisfies ES m m m When ES m m The energy storage power balance satisfies the energy storage power balance when the energy storage power balance satisfies the energy storage power balance, that is, the obtained initial energy storage power.

[0040] In the foregoing energy storage wind-solar-photovoltaic energy system power complementary dispatching calculation method, based on the obtained maximum load and initial energy storage power, the calculation formula of the remaining space wind power generation output, the remaining space photovoltaic power generation output, the wind power curtailment output and the photovoltaic power curtailment output in the adjustment period is:

[0041] In the formula, WEX i is the remaining space wind power generation output in the i time period in the adjustment period, MW; PVEX i is the remaining space photovoltaic power generation output in the i time period in the adjustment period, MW; Wa i is the wind power curtailment output in the i time period in the adjustment period, MW; and PVa i is the photovoltaic power curtailment output in the i time period in the adjustment period, MW.

[0042] Currently, there are few methods in the market that simultaneously consider the grid load characteristics and the remaining space absorption. Compared with the prior art, the present application provides an energy storage wind-solar-photovoltaic energy system power complementary dispatching calculation method. The method of the present application is limited by the channel capacity, and is based on the priority to meet the load characteristics of the receiving end grid. The wind power and photovoltaic output are adjusted by the peak regulation of the energy storage and the energy storage effect to meet the load characteristics. The remaining wind power and photovoltaic output are absorbed by using the remaining space between the load and the channel capacity. The method of the present application can fully play the peak regulation role and the energy storage role of the energy storage power station, can absorb the wind-solar output as much as possible on the basis of meeting the grid load characteristics, realizes the cross-day regulation of the energy storage power station in a forward and reverse time sequence alternating manner, and ensures the balance of the energy storage power. The method of the present application reflects the complementary operation between the energy storage and the wind power and photovoltaic, and finely distinguishes and calculates the wind power and photovoltaic load output, the output used for charging by the energy storage and the respective power curtailment output, and is a reasonable complementary dispatching calculation method for the current energy storage-wind power-photovoltaic energy system power configuration. The method of the present application is suitable for the development of energy bases in areas such as Shagehuang, and is suitable for micro-grid applications such as integrated energy systems and incremental distribution networks. The energy storage in the method covers different energy storage forms such as pumped storage, electrochemical energy storage and new energy storage, and has good popularization prospect. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is a main idea step diagram of the present application for complementary scheduling calculation in a regulation period;

[0044] Figure 2 is a typical period complementary power output process diagram before power supply;

[0045] Figure 3 is a typical period complementary power output process diagram after power supply. DETAILED DESCRIPTION

[0046] The present application is further described below in conjunction with examples, but is not limited to the basis of the application.

[0047] Example, a complementary scheduling calculation method of an energy storage wind power photovoltaic energy system.

[0048] The present method performs complementary scheduling calculation in a regulation period with an hour as a time period. The regulation period can be a month, a decade or a week, so the parameters involved in the method are all for the regulation period, such as the maximum load refers to the maximum load in the regulation period, and the initial energy storage capacity refers to the initial energy storage capacity in the regulation period. The present method performs complementary scheduling calculation with an hour as a time period, and then the complementary calculations of each regulation period can be combined to obtain a complementary scheduling calculation process of 8760h in a year.

[0049] The method focuses on the calculation of hourly output in the adjustment period. The main steps of the calculation are shown in Figure 1: according to the energy storage scale and the number of hours, the initial energy storage capacity is assumed, and on this basis, the maximum load is assumed according to the channel capacity, combined with the hourly load unit value (curve) to obtain the hourly power transmission load; wherein the channel capacity is divided into two parts below the load curve and the remaining space; then combined with the initial wind power hourly output and the initial photovoltaic hourly output, the photovoltaic power output under load, the wind power output under load, the energy storage output under the maximum load, and the energy storage output under the wind and light charging are calculated, and on this basis, combined with the energy storage charging and generating conversion efficiency, the energy storage capacity is calculated in reverse sequence; then combined with the energy storage capacity, the energy storage power output under load, the actual wind and light charging output of the energy storage, and the remaining space energy storage power output are calculated in each time period, and the energy storage capacity at the end of the period is obtained according to the calculation results; combined with the hourly power transmission load, the wind power output under load, the photovoltaic power output under load, and the energy storage power output under load, it is judged whether the power transmission load and the power output under load are balanced in power and capacity, if the power and capacity are not balanced, the maximum load is recalculated until the maximum load that meets the power and capacity balance is obtained, and then the hourly power output of the power supply under load is obtained, and then combined with the energy storage capacity at the end of the period, it is judged whether the energy storage capacity is balanced, if the energy storage capacity is not balanced, the initial energy storage capacity is recalculated until the initial energy storage capacity that meets the energy storage capacity balance is obtained; based on the obtained maximum load and initial energy storage capacity, the remaining space wind power output, the remaining space photovoltaic power output, the wind power curtailment, and the photovoltaic power curtailment in the adjustment period are obtained, and the statistical results are obtained to obtain the power index.

[0050] The method mainly divides the calculation into two loops, namely the outer loop for solving the initial energy storage capacity and the inner loop for solving the maximum load in the adjustment period. The specific hourly output calculation is as follows:

[0051] (1) Hourly power transmission load calculation: according to the energy storage scale and the number of hours, the initial energy storage capacity is assumed, and on this basis, the maximum load is assumed according to the channel capacity, combined with the hourly load unit value to obtain the calculation formula of the hourly power transmission load: i =Load max ·Load_curve i

[0052] In the formula: Tload i is the power transmission load of the i-th period, MW; Load max is the maximum load, MW; Load_curve i is the load unit value of the i-th period.

[0053] (2) Load wind, light output calculation: combined with the initial wind power and initial photovoltaic power output, the calculation formula of load wind power and load photovoltaic power output is:

[0054] In the formula: WL i is the load wind power of the i period, MW; PVL i is the load photovoltaic power output of the i period, MW; W i is the initial wind power of the i period, MW; PV i is the initial photovoltaic output of the i period.

[0055] The above calculation shows that combined with the collected initial wind power and photovoltaic power output, the minimum value between the sum of the load and the wind power and the sum of the initial photovoltaic power is the sum of the load wind power and the photovoltaic power output, and the load photovoltaic power output and the load wind power output are calculated according to the proportion weight of the initial wind power and the initial photovoltaic power.

[0056] (3) Energy storage needs to be charged with the top load output, energy storage needs to be charged with wind and light charging output calculation: the calculation formula of energy storage needs to be charged with the top load output and energy storage needs to be charged with wind and light charging output is:

[0057] In the formula: SNout i is the energy storage needs to be charged with the top load output of the i period, MW; SNin i is the energy storage needs to be charged with wind and light charging output of the i period, MW.

[0058] The above calculation shows that the energy storage needs to be charged with the top load output is obtained by subtracting the load wind power and the load photovoltaic power output from the load; and the sum of the initial wind power and the initial photovoltaic power that exceeds the load is the energy storage needs to be charged with wind and light charging output.

[0059] (4) Energy storage capacity calculation: combined with the energy storage charging and discharging conversion efficiency, the energy storage capacity is calculated in reverse sequence, which considers the balance of energy storage capacity in the adjustment period, and the energy storage capacity at the end period should be equal to the initial energy storage capacity, and the calculation formula is:

[0060] ① If i = m, then ESN m = ES0

[0061] ② If 1 ≤ i < m and SNout i+1 > 0, then ESN i = ESN i+1 + SNout i+1

[0062] ③ If 1 ≤ i < m and SNout i+1≤ 0, then ESN i = Max(ESN i+1 - SNin i+1 × α, 0)

[0063] wherein m is the number of time periods in the regulation period, i.e. the last time period; ESM m is the required energy storage amount of the last time period m, MWh; ES0 is the initial energy storage amount, MWh; ESN i is the required energy storage amount of the i-th time period, MWh; and α is the energy storage charging and discharging conversion efficiency.

[0064] The energy storage charging and discharging conversion efficiency is determined according to the type of the power station. If the energy storage is a pumped storage power station, the value is usually 0.75. If the energy storage is an electrochemical energy storage power station, the value is usually 0.80-0.95.

[0065] The above calculation shows that the required energy storage amount of the last time period should be equal to the initial energy storage amount, and the required energy storage amount of an intermediate time period should take into account the sum of the energy storage required discharging load output of the subsequent time periods.

[0066] The above calculation shows that the required energy storage amount of the last time period should be equal to the initial energy storage amount, and the required energy storage amount of an intermediate time period should take into account the sum of the energy storage required discharging load output of the subsequent time periods.

[0067] (5) Energy storage output and energy storage amount calculation by time: the energy storage discharging load output, the energy storage actual wind and solar charging output and the remaining space energy storage discharging load output under the load of each time period are calculated by time period based on the required energy storage amount and the energy storage amount. The calculation formula and sequence of the energy storage amount of the last time period are as follows:

[0068] ① If i = 1, then:

[0069] The energy storage discharging load output under the load of the first time period is: SLout1 = Min(NS, SNout1, ES0)

[0070] The energy storage actual wind and solar charging output of the first time period is:

[0071] If SLin1 > 0, then the remaining space energy storage discharging load output is: SEXout1 = 0

[0072] If SLin1≤0 and ES0≤ESN1, then the remaining space energy storage power output is: SEXout1=0

[0073] If SLin1≤0 and ES0>ESN1, then the remaining space energy storage power generation output is:

[0074] The energy storage capacity for the first time period is: ES1 = ES0 + SLin1 × α - SLout1 - SEXout1

[0075] ②If 2≤i≤m, then:

[0076] The energy storage power output under the load in the i-th time period is: SLout i =Min(NS,SNout) i ,ES i-1 )

[0077] The actual output of wind and solar charging utilized by energy storage in the i-th time period is:

[0078] If SLin i If the value is greater than 0, then the remaining space energy storage power generation output is: SEXout i =0

[0079] If SLin i ≤0 and ES i-1 ≤ESN i Then the remaining space for energy storage and power generation output is: SEXout i =0

[0080] If SLin i ≤0, and ES i-1 >ESN i Then the remaining space for energy storage and power generation output is:

[0081] The energy storage capacity for the first time period is: ES i =ES i-1 +SLin i ×α-SLout i -SEXout i

[0082] ③ Calculate the energy storage output from wind power charging and the energy storage output from photovoltaic charging based on the ratio of initial wind power output to initial photovoltaic output, as detailed below:

[0083] Where: SLout i Let SLin be the energy storage generation output under the load in time period i, in MW; iThe actual wind and solar charging output for energy storage in the i-th time period is MW; SEXout i NS represents the remaining energy storage and power generation output in time period i, in MW; x, y, z, and v are intermediate conversion variables, in MW; NS represents the installed capacity of the energy storage power station, in MW; H represents the energy storage hours, in h; NT represents the channel capacity, in MW; ES represents the remaining space for energy storage and power generation output in time period i. i SLWin represents the energy stored in time period i, in MWh. i For the energy storage utilization of wind power charging output in the i-th time period, MW; SLPVin i Let be the power output of photovoltaic charging for energy storage in the i-th time period, in MW.

[0084] The above calculations explain that: the energy storage power generation output under load is the actual output of the energy storage that can generate the maximum load, and the remaining space energy storage power generation output refers to the output that can be generated if the current energy storage capacity is greater than the required energy storage capacity.

[0085] (6) Power balance judgment under internal circulation load: Combine hourly power transmission load, wind power generation output under load, photovoltaic power generation output under load, and energy storage power generation output under load to determine whether the power transmission load and the power generation output under load are in balance. Use the cumulative power deficit value under load for analysis and judgment. The formula for calculating the cumulative power deficit value under load is:

[0086] Where: Lmiss is the cumulative power deficit under load, in MW;

[0087] If Lmiss>0, it indicates that the power supply is unbalanced. When re-assuming the maximum load, the maximum load needs to be reduced. The assumed maximum load is based on the channel capacity as the upper limit and 0 as the lower limit. After each assumption of the maximum load, the calculation of the above steps (1)-(5) is repeated, and the power supply balance is judged again. The calculation is gradually approximated by the bisection method. When the assumed maximum load satisfies Lmiss=0 and the maximum load is increased, Lmiss>0 occurs. The maximum load satisfies the power supply balance and is the obtained maximum load. Based on the maximum load, the hourly power generation output of the power source under the load can be obtained.

[0088] The above calculations show that the cumulative power deficit under load is equal to the power transmission load during the regulation period minus the wind power generation output, photovoltaic power generation output, and energy storage power generation output under load.

[0089] (7) External circulation energy storage balance judgment: The balance of energy storage capacity is judged by combining the energy storage capacity at the end of the period. The calculation method is as follows: the energy storage capacity at the end of the period is calculated based on the obtained maximum load, and compared with the assumed initial energy storage capacity. If ES0 > ES0, the balance is determined by the following method. m, which indicates that the energy storage power is unbalanced; the initial energy storage power needs to be reduced, the assumed initial energy storage power is upper limited by the maximum energy storage power, i.e. NSxH, and lower limited by 0, the calculation of steps (1)-(6) is repeated after assuming the initial energy storage power, and the energy storage power balance is judged again, and the bisection method is used to gradually approach the calculation, when the assumed initial energy storage power satisfies ES m = ES0 and increases, then the initial energy storage power appears ES m < ES0, the energy storage power balance satisfies the energy storage power balance, i.e. the initial energy storage power is obtained.

[0090] The above calculation shows that the initial energy storage power should be as large as possible, and the energy storage power at the end period needs to be equal to the initial energy storage power.

[0091] (8) The remaining wind and light output is calculated: based on the obtained maximum load and initial energy storage power, the calculation formula of the remaining space wind power generation output, the remaining space photovoltaic power generation output, the wind power abandoned power output and the photovoltaic abandoned power output in the adjustment period is:

[0092] In the formula: WEX i is the remaining space wind power generation output in the i period in the adjustment period, MW; PVEX i is the remaining space photovoltaic power generation output in the i period in the adjustment period, MW; Wa i is the wind power abandoned power output in the i period in the adjustment period, MW; PVa i is the photovoltaic abandoned power output in the i period in the adjustment period, MW.

[0093] The above calculation shows that the remaining space wind power generation output and the remaining space photovoltaic power generation output are mainly limited by the channel capacity, and the part exceeding the channel capacity is the wind power abandoned power output and the photovoltaic abandoned power output.

[0094] Through the above eight specific steps and formulas, the hourly power generation output of energy storage, wind power, photovoltaic under the sending load and the remaining space, and the energy storage charging power and the wind power and photovoltaic abandoned power output can be obtained, and the power indicators can be obtained by statistics.

[0095] The above method is practically applied to a certain energy storage-wind power-photovoltaic energy system, the energy storage scale is 2500MW, the energy storage hours is 6h, the energy storage form is pumped storage power station, the wind power scale is 4000MW, the photovoltaic scale is 8000MW, and the channel capacity is 2500MW. August is selected as a typical month, the month is selected as a regulation period, and the power output process before complementation is shown in FIG. 2. The method is used for complementation scheduling calculation, the maximum load of the regulation period is 1900MW, the initial energy storage power is 14000MWh, the power output process after complementation is shown in FIG. 3, according to the hourly output process statistics, the wind power generation capacity under load in August is 506 million kWh, the photovoltaic power generation capacity under load is 400 million kWh, the energy storage power generation capacity under load is 142 million kWh, the remaining space wind power generation capacity is 98 million kWh, the remaining space photovoltaic power generation capacity is 102 million kWh, the remaining space energy storage power generation capacity is 162 million kWh, the wind power charging capacity of the energy storage is 147 million kWh, the photovoltaic charging capacity of the energy storage is 259 million kWh, the wind power curtailment capacity is 55 million kWh, the photovoltaic curtailment capacity is 126 million kWh, and the wind and light curtailment rate is 10%.

[0096] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacements or changes to the technical solutions and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A power complementary scheduling calculation method for an energy storage wind light photovoltaic energy system, characterized in that: The method is calculated in a regulation period, comprising the steps of: assuming an initial energy storage power based on the energy storage scale and the number of hours, and then assuming a maximum load based on the channel capacity, combining the hourly load standard value to obtain the hourly power transmission load; further combining the initial hourly wind power output and the initial hourly photovoltaic output to calculate the photovoltaic power output under load, the wind power output under load, the energy storage power output required for peak load, and the energy storage power output required for wind and light charging, and then combining the energy storage charging and generating conversion efficiency to calculate the energy storage power required to be left in reverse sequence; further combining the energy storage power required to be left, the energy storage power in each time period to calculate the energy storage power output under load, the actual wind and light charging power of the energy storage, and the remaining space energy storage power output, and obtaining the energy storage power at the end period according to the calculation result; combining the hourly power transmission load, the wind power output under load, the photovoltaic power output under load, and the energy storage power output under load to determine whether the power transmission load and the power output under load are balanced in power and quantity, if the power and quantity are not balanced, the maximum load is recalculated until the maximum load satisfying the power and quantity balance is obtained, and then the hourly power output of the power source under load is obtained, and then the energy storage power is combined to determine whether the energy storage power is balanced, if the energy storage power is not balanced, the initial energy storage power is recalculated until the initial energy storage power satisfying the energy storage power balance is obtained; based on the obtained maximum load and initial energy storage power, the remaining space wind power output, the remaining space photovoltaic power output, the wind power curtailment, and the photovoltaic power curtailment in the regulation period are obtained, and the statistical result is obtained to obtain the power index.

2. The energy storage wind light photovoltaic power complementary dispatching calculation method according to claim 1, characterized in that: The calculation formula of the hourly power transmission load is: Tload i = Load max · Load_curve i ; where: Tload i is the power transmission load for the ith period, MW; Load max is the maximum load, MW; Load_curve i is the load unit value for the ith period.

3. The energy storage wind light photovoltaic power complementary dispatching calculation method according to claim 2, characterized in that: The calculation formula of the photovoltaic power generation output under the load and the wind power generation output under the load is calculated by combining the initial wind power hourly output and the initial photovoltaic hourly output. wherein: WL i is the wind power output under load for the ith period, MW; PVL i is the photovoltaic power output under load for the ith period, MW; W i is the initial wind power output for the ith time period, MW; PV i is the initial photovoltaic output for the ith time period.

4. The energy storage wind light photovoltaic power complementary dispatching calculation method according to claim 3, characterized in that: The calculation formula of the energy storage required to generate top load output and the energy storage required to utilize wind and light charging output is: where: SNout i is the top negative load output of the energy storage in the i-th period, MW; SNin i is the wind and light charging output of the energy storage in the i-th period, MW.

5. The energy storage wind light photovoltaic power complementary dispatching calculation method according to claim 4, characterized in that: The energy storage power required to be left is calculated in reverse sequence based on the energy storage charging and generating conversion efficiency, considering the balance of the energy storage power in the regulation period, and the energy storage power required to be left at the end period should be equal to the initial energy storage power, and the calculation formula is as follows: m = ESO if i = m;​ (ii) if 1 < i < m and SNout i+1 > 0, then ESN i = ESN i+1 + SNout i+1 ; i+1 i i+1 i = Max(ESN= Max(ESN= Max(ESN= Max(ESN= Max(ESN = Max(ESN = Max(ESN = Max(ESN = Max(ESN = Max(ESN = Max(ESN = Max(ESN = Max(ESN = Max(ESN = Max In the formula, m is the number of time periods in the regulation cycle, i.e. the last time period; ESM m is the required energy storage amount of the last time period m, MWh; ES0is the initial energy storage amount, MWh; ESN i is the required energy storage amount of the i th time period, MWh; and α is the energy storage charging and discharging conversion efficiency.

6. The energy storage wind light photovoltaic power complementary dispatching calculation method according to claim 5, characterized in that: The energy storage power output under load, the actual wind and light charging power of the energy storage, and the remaining space energy storage power output are calculated in each time period based on the energy storage power required to be left, and the energy storage power at the end period is obtained according to the calculation result, and the calculation formula and sequence are as follows: ① If i = 1, then: The energy storage power output under load in the first period is SLout1 = Min (NS, SNout1, ES0); The actual utilization of the wind and solar charging output in the first time period is: If SLin1 > 0, the remaining space energy storage power output is SEXout1 = 0; If SLin1 ≤ 0 and ES0 ≤ ESN1, the remaining space energy storage power output is SEXout1 = 0; If SLin1 < 0 and ES0 > ESN1, the remaining space energy storage power output is: The energy storage power in the first period is ES1 = ES0 + SLin1 × α - SLout1 - SEXout1; ② If 2 ≤ i ≤ m, then: The energy storage power output under the i-th period load is: SLout i = Min(NS, SNout i , ES i-1 ); The actual utilization of the wind and solar charging output of the i th time period is: If SLin i If the value is greater than 0, then the remaining space energy storage power generation output is: SEXout i =0; If SLin i ≤ 0 and ES i-1 ≤ ESN i , then the remaining space energy generation output is: SEXout i = 0. If SLin i ≤ 0, and ES i-1 > ESN i , then the remaining space energy storage power output is: The energy storage amount of the i th period is ES i = ES i-1 + SLin i × α - SLout i - SEXout i ; ③According to the proportion of the initial wind power output and the initial photovoltaic output, the wind power charging output for energy storage and the photovoltaic charging output for energy storage are calculated, specifically as follows: In the formula: SLout i is the energy storage power generation output under the load of the ith period, MW; SLin i is the actual energy storage wind and light charging output of the ith period, MW; SEXout i is the remaining space energy storage power generation output of the ith period, MW; x, y, z, and v are intermediate conversion variables, MW; NS is the installed capacity of the energy storage power station, MW; H is the energy storage hours, h; NT is the channel capacity, MW; ES i is the energy storage power of the ith period, MWh; SLWin i is the energy storage wind charging output of the ith period, MW; SLPVin i is the energy storage photovoltaic charging output of the ith period, MW.

7. The energy storage wind light photovoltaic power complementary dispatching calculation method according to claim 6, characterized in that: The combination of the time-varying power transmission load, the wind power generation output under the load, the photovoltaic power generation output under the load and the energy storage power generation output under the load is used to judge whether the power transmission load and the power generation output under the load are in power and power balance, and the judgment is analyzed by using the power shortage cumulative value under the load. The power shortage cumulative value under the load is calculated by the following formula: In the formula: Lmiss is the cumulative value of power shortage under load, MW; If Lmiss > 0, it means that the power and quantity are not balanced. Reassuming the maximum load needs to reduce the maximum load, assuming the maximum load with the channel capacity as the upper limit value, 0 as the lower limit value, each time after assuming the maximum load, repeating the calculation of the preceding steps, and again performing the power balance judgment, using the bisection method to gradually approach the calculation, when assuming a certain maximum load meets Lmiss=0 and increasing the maximum load results in Lmiss>0, the maximum load that meets the power balance is the maximum load obtained, and the hourly power generation output of the power source under the load can be obtained based on the maximum load.

8. The energy storage wind light photovoltaic power complementary dispatching calculation method according to claim 7, characterized in that: The energy storage capacity at the end time period is used to determine whether the energy storage capacity is balanced, and the calculation method is: based on the maximum load calculated to obtain the energy storage capacity at the end time period, and compared with the assumed initial energy storage capacity, if ES0>ES m , it indicates that the energy storage capacity is unbalanced; the initial energy storage capacity needs to be reduced when re-assuming the initial energy storage capacity, and the assumed initial energy storage capacity is taken as the upper limit value of the maximum energy storage capacity, i.e. NSxH, and 0 as the lower limit value. After assuming the initial energy storage capacity each time, the calculation of the foregoing steps is repeated, and the energy storage capacity balance is judged again, and the bisection method is used to gradually approach the calculation, when the assumed initial energy storage capacity satisfies ES m =ES0 and increases, then the initial energy storage capacity appears ES m <ES0, the energy storage capacity balance satisfies the energy storage capacity balance, which is the obtained initial energy storage capacity.

9. The energy storage wind light photovoltaic power complementary dispatching calculation method according to claim 8, characterized in that: The calculation formula of the remaining space wind power generation output, the remaining space photovoltaic power generation output, the wind power curtailment output and the photovoltaic curtailment output in the adjustment period is obtained based on the maximum load and the initial energy storage capacity. where: WEX i is the remaining space wind power generation output in the i th period of the adjustment cycle, MW; PVEX i is the remaining space photovoltaic power generation output in the i th period of the adjustment cycle, MW; Wa i is the wind power curtailment output in the i th period of the adjustment cycle, MW; PVa i is the photovoltaic power curtailment output in the i th period of the adjustment cycle, MW.

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