Energy storage cooperative control system and method adapted to power grid stability control defense line

Abstract

The invention discloses an energy storage cooperative control system and method adapted to a power grid stability control defense line, and the system comprises an interface control terminal, an energy storage execution station stability control device, a plurality of looped network switches, and a plurality of groups of energy storage converters. The interface control terminal is used for acquiring the current first power data of each group of energy storage converters and distributing the active power target instruction value to each group of energy storage converters; the energy storage execution station stability control device is used for calculating current second electric power data according to the current first electric power data, determining an active power target instruction value of each group of energy storage converters according to the current second electric power data and the control command quantity, and transmitting the active power target instruction value to the interface control terminal; the looped network switch is used for connecting the interface control terminal and each group of energy storage converters; and the energy storage converter is used for adjusting according to the active power target instruction value. By implementing the method, the stability control regulation time of the power grid energy storage system can be prolonged, and the requirement of quick action of a power grid stability control defense line is met.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage collaborative control, and in particular to an energy storage collaborative control system and method adapted to a power grid stabilization defense line. Background Art

[0002] As the installed capacity of grid energy storage power stations increases, the role of energy storage in participating in the grid stability control line will gradually become stronger. According to regulations, electrochemical energy storage systems connected to public power grids with voltage levels of 110 (220) kV and above should have the ability to participate in primary frequency regulation and have automatic power generation control functions.

[0003] In the prior art, the conventional automatic power generation control and adjustment time of the energy storage system is generally 1 to 2 seconds, which cannot meet the needs of rapid action of the grid stabilization and control line. Summary of the invention

[0004] The present invention provides an energy storage coordination system and method adapted to a power grid stabilization control defense line, which can improve the stabilization control adjustment time of a power grid energy storage system, thereby meeting the demand for rapid action of the power grid stabilization control defense line.

[0005] An embodiment of the present invention provides an energy storage coordination system adapted to the grid stabilization control defense line, comprising: an interface control terminal, an energy storage execution station stabilization control device, a plurality of ring network switches, and a plurality of groups of energy storage converters;

[0006] The first end of the interface control terminal is connected to the energy storage execution station stabilization control device, the second end of the interface control terminal is connected to the first end of the ring network switch, and the second end of the ring network switch is connected to the energy storage converter; each ring network switch corresponds to a group of energy storage converters;

[0007] The interface control terminal is used to obtain the current first power data of each group of energy storage converters and distribute the active power target command value of each group of energy storage converters to each group of energy storage converters; wherein the current first power data includes: actual charging and discharging power, maximum charging power, maximum discharging power, maximum battery charge and charge state;

[0008] The energy storage execution station stabilization control device is used to calculate the current second power data of each group of energy storage converters according to the current first power data, and determine the active power target command value of each group of energy storage converters according to the current second power data and the control command amount, so as to transmit the active power target command value of each group of energy storage converters to the interface control terminal; wherein the current second power data includes: the actual maximum power that can be reduced and the actual maximum power that can be increased, and the control command amount includes the increase control command amount and the reduction control command amount;

[0009] The ring network switch is used to connect the interface control terminal and each group of energy storage converters;

[0010] The energy storage converter is used to adjust the current active power value according to the active power target command value.

[0011] Furthermore, the current second power data of each group of energy storage converters is calculated based on the current first power data, including:

[0012] According to the maximum charge capacity of the battery, the state of charge and the maximum charging power, the maximum charging power duration of each group of energy storage converters is calculated;

[0013] According to the maximum charge capacity of the battery, the state of charge and the maximum discharge power, the maximum discharge power duration of each group of energy storage converters is calculated;

[0014] Compare the actual charging and discharging power with the maximum charging power, the maximum charging power duration and the preset maximum charging and discharging demand time value, and determine the actual maximum reversible power according to the comparison result;

[0015] Compare the actual charge and discharge power with the maximum discharge power, the maximum discharge power duration and the preset maximum charge and discharge demand time value, and determine the actual maximum boostable power according to the comparison result;

[0016] The current second power data is composed according to the actual maximum power that can be reduced and the actual maximum power that can be increased.

[0017] Furthermore, comparing the actual charge and discharge power with the maximum discharge power, the maximum discharge power duration and the preset maximum charge and discharge demand time value, and determining the actual maximum boostable power according to the comparison result, includes:

[0018] If the actual charge and discharge power is not greater than the maximum discharge power and is not less than 0, and the maximum discharge power duration is less than the preset maximum charge and discharge demand time value, then the actual maximum boost power is 0;

[0019] If the actual charge and discharge power is less than 0, and the maximum discharge power duration is less than the preset maximum charge and discharge demand time value, the opposite of the actual charge and discharge power is used as the actual maximum boostable power;

[0020] If the maximum discharge power duration is not less than the preset maximum charge and discharge demand time value, the difference between the maximum discharge power and the actual charge and discharge power is taken as the actual maximum boostable power.

[0021] Furthermore, the active power target instruction value of each group of energy storage converters is determined according to the second power data and the control command amount, including:

[0022] Calculate the sum of the above-mentioned actual maximum boostable powers of each group of energy storage converters to obtain a first sum;

[0023] The above-mentioned lifting control command amount is compared with the above-mentioned first sum of each group of energy storage converters, and the active power target instruction value of each group of energy storage converters is determined according to the comparison result and the above-mentioned second power data.

[0024] Furthermore, comparing the boost control command amount with the first sum of each group of energy storage converters, and determining the active power target command value of each group of energy storage converters according to the comparison result and the second power data, includes:

[0025] Comparing the lifting control command amount with the first sum of each group of energy storage converters;

[0026] If the boost control command amount is not less than the first sum, the sum of the actual charging and discharging power corresponding to each group of energy storage converters and the actual maximum boostable power is used as the active power target command value of each group of energy storage converters;

[0027] If the lifting control command amount is less than the first sum, the energy storage converters of each group are numbered in order, and the first target instruction calculation operation is repeatedly performed until the first adjustment amount is not less than the lifting control command amount, thereby obtaining a final first adjustment amount;

[0028] Taking each group of energy storage converters corresponding to the final first adjustment amount as the first target energy storage converter, and taking the sum of the actual discharge power and the actual maximum boostable power of each of the first target energy storage converters as the active power target instruction value of each of the first target energy storage converters;

[0029] The active power target command values ​​of the remaining groups of energy storage converters are the above-mentioned actual charging and discharging powers;

[0030] The calculation operation of the first target instruction is:

[0031] Get the number of the current group; the number of the initial group is the first group;

[0032] Calculate the sum of the actual maximum power that can be increased for all groups of energy storage converters that do not exceed the current number size to obtain a first adjustment amount;

[0033] The current first adjustment amount is compared with the above-mentioned lifting control command amount. If the current first adjustment amount is smaller than the above-mentioned lifting control command amount, the number of the next group is obtained.

[0034] Furthermore, comparing the actual charging and discharging power with the maximum charging power, the maximum charging power duration and the preset maximum charging and discharging demand time value, and determining the actual maximum power that can be reduced according to the comparison result, includes:

[0035] If the actual charging and discharging power is not less than the negative value of the maximum charging power and is not greater than 0, and the maximum charging power duration is less than the preset maximum charging and discharging demand time, then the actual maximum power reduction is 0;

[0036] If the actual charge and discharge power is greater than 0, and the maximum charge power duration is less than the preset maximum charge and discharge demand time, the maximum discharge power is used as the actual maximum fallback power.

[0037] If the maximum charging power can last for no less than the preset maximum charging and discharging demand time value, the sum of the maximum charging power and the actual charging and discharging power shall be taken as the actual maximum fallback power.

[0038] Furthermore, the active power target instruction value of each group of energy storage converters is determined according to the second power data and the control command amount, including:

[0039] Calculate the sum of the above-mentioned actual maximum power that can be reduced back by each group of energy storage converters to obtain a second sum;

[0040] The above-mentioned fallback control command amount is compared with the above-mentioned second sum of each group of energy storage converters, and the active power target instruction value of each group of energy storage converters is determined according to the comparison result and the above-mentioned second power data.

[0041] Furthermore, comparing the fallback control command amount with the second sum of each group of energy storage converters, and determining the active power target command value of each group of energy storage converters according to the comparison result and the second power data, includes:

[0042] Comparing the fallback control command amount with the second sum of each group of energy storage converters;

[0043] If the fallback control command amount is not less than the second sum, the difference between the actual charge and discharge power corresponding to each group of energy storage converters and the actual maximum fallback power is used as the active power target command value of each group of energy storage converters;

[0044] If the above-mentioned fallback control command amount is less than the above-mentioned second sum, then the energy storage converters of each group are numbered in order, and the second target instruction calculation operation is repeatedly performed until the second adjustment amount is not less than the above-mentioned fallback control command amount, and the final second adjustment amount is obtained. The energy storage converters of each group corresponding to the final second adjustment amount are used as the second target energy storage converters, and the difference between the actual discharge power of each of the above-mentioned second target energy storage converters and the actual maximum fallback power is used as the active power target instruction value of each of the above-mentioned second target energy storage converters;

[0045] The active power target command values ​​of the remaining groups of energy storage converters are the above-mentioned actual charging and discharging powers;

[0046] The second target instruction calculation operation is:

[0047] Get the number of the current group; the number of the initial group is the first group;

[0048] Calculate the sum of the actual maximum power that can be reduced for all groups of energy storage converters that do not exceed the current number size to obtain a second adjustment amount;

[0049] The current second adjustment amount is compared with the above-mentioned return-down control command amount. If the current second adjustment amount is smaller than the above-mentioned return-down control command amount, the number of the next group is obtained.

[0050] Further, the current active power value is adjusted according to the active power target command value, including:

[0051] According to the above active power target command value, the current active power value is adjusted to the above active power target command value.

[0052] Based on the above system item, the present invention provides a method item embodiment accordingly;

[0053] The present invention provides a method for coordinated energy storage control adapted to a power grid stabilization defense line, comprising:

[0054] Obtaining current first power data and control command quantity; wherein the first power data includes: actual charging and discharging power, maximum charging power, maximum discharging power, maximum battery charge capacity and state of charge; and the control command quantity includes an increase control command quantity and a decrease control command quantity;

[0055] The current second power data is calculated based on the current first power data; wherein the second power data includes: the actual maximum power that can be reduced and the actual maximum power that can be increased;

[0056] Determine the active power target command value of each group of energy storage converters according to the current second power data and the control command amount, and transmit the active power target command value of each group of energy storage converters to the interface control terminal, so that the interface control terminal distributes the active power target command value to each group of energy storage converters through the ring network switch, so that each group of energy storage converters is adjusted according to the active power target command value;

[0057] Among them, the first end of the above-mentioned interface control terminal is connected to the above-mentioned energy storage execution station stability control device, the second end of the above-mentioned interface control terminal is connected to the first end of the above-mentioned ring network switch, and the second end of the above-mentioned ring network switch is connected to the above-mentioned energy storage inverter; wherein each ring network switch corresponds to a group of energy storage inverters.

[0058] The embodiments of the present invention have the following beneficial effects:

[0059] The present invention provides an energy storage coordination system and method that adapts to the power grid stabilization control line. The above system includes: an interface control terminal, an energy storage execution station stabilization control device, a plurality of ring network switches and a plurality of groups of energy storage converters; first, the first end of the above interface control terminal is connected to the above energy storage execution station stabilization control device, the second end of the above interface control terminal is connected to the first end of the above ring network switch, and the second end of the above ring network switch is connected to the above energy storage converter; wherein each ring network switch corresponds to a group of energy storage converters; secondly, the above interface control terminal is used to obtain the current first power data of each group of energy storage converters and distribute the active power target instruction value of each group of energy storage converters to each group of energy storage converters; wherein the above current first power data includes: actual charging and discharging power, maximum charging power, maximum discharging power, The maximum charge capacity and charge state of the battery; the above-mentioned energy storage execution station stabilization control device is used to calculate the current second power data of the above-mentioned groups of energy storage inverters according to the above-mentioned current first power data, and determine the active power target instruction value of the above-mentioned groups of energy storage inverters according to the above-mentioned current second power data and the control command amount, so as to transmit the active power target instruction value of the above-mentioned groups of energy storage inverters to the above-mentioned interface control terminal; wherein the above-mentioned current second power data includes: the actual maximum power that can be reduced and the actual maximum power that can be increased, and the above-mentioned control command amount includes the increase control command amount and the reduction control command amount; the above-mentioned ring network switch is used to connect the above-mentioned interface control terminal with the above-mentioned groups of energy storage inverters; the above-mentioned energy storage inverter is used to adjust the current active power value according to the above-mentioned active power target instruction value. Therefore, the present invention utilizes an interface control terminal, an energy storage execution station stability control device, a ring network switch and an energy storage converter to jointly form an energy storage collaborative control device. Subsequently, each group of energy storage converters receives the active power target command value of each group of energy storage converters obtained from the energy storage execution station stability control device, and then adjusts the current active power according to the target command value to achieve energy storage stability control. Among them, since the energy storage converter can respond and adjust the active power within 100ms after receiving the active power target command value, the stability control adjustment time of the power grid energy storage system is greatly improved, and the demand for rapid action of the power grid stability control line is met. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 It is a structural schematic diagram of an energy storage collaborative control system adapted to a grid stabilization defense line provided by an embodiment of the present invention.

[0061] Figure 2 It is a flow chart of a method for coordinated energy storage control adapted to a grid stabilization defense line provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0062] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] like Figure 1 As shown, an energy storage cooperative control system adapted to a grid stabilization defense line provided by an embodiment of the present invention includes:

[0064] Interface control terminal, energy storage execution station stability control device, several ring network switches and several groups of energy storage converters;

[0065] The first end of the interface control terminal is connected to the energy storage execution station stabilization control device, the second end of the interface control terminal is connected to the first end of the ring network switch, and the second end of the ring network switch is connected to the energy storage converter; each ring network switch corresponds to a group of energy storage converters;

[0066] Specifically, the energy storage execution station stabilization control device is connected to the interface control terminal via an optical fiber, and the interface control terminal is connected to the energy storage converter via a network cable, and the transmission delay can be ignored.

[0067] Preferably, the substation builds an independent ring network or star network (including communication cables and switches), which is physically isolated from other communication networks in the station, so that the interface control terminal can control each group of energy storage converters; each ring network switch can be connected to one or more energy storage converters according to actual conditions. At the same time, the communication network should adopt a ring network architecture, which can still have normal communication capabilities after any communication link fails; in addition, when the interface control terminal communicates with the outside world, network storms should be avoided.

[0068] The interface control terminal is used to obtain the current first power data of each group of energy storage converters and distribute the active power target command value of each group of energy storage converters to each group of energy storage converters; wherein the current first power data includes: actual charging and discharging power, maximum charging power, maximum discharging power, maximum battery charge and charge state;

[0069] Specifically, when the value of the above-mentioned first power data is a positive number, the energy storage inverter of the current group is in a discharging state; when the value is a negative number, the energy storage inverter of the current group is in a charging state; when the value is 0, the energy storage inverter of the current group is in a charging state or a shutdown state.

[0070] Specifically, the maximum charging power and the maximum discharging power are both positive numbers, and the value of the state of charge is expressed in thousandths.

[0071] The energy storage execution station stabilization control device is used to calculate the current second power data of each group of energy storage converters according to the current first power data, and determine the active power target command value of each group of energy storage converters according to the current second power data and the control command amount, so as to transmit the active power target command value of each group of energy storage converters to the interface control terminal; wherein the current second power data includes: the actual maximum power that can be reduced and the actual maximum power that can be increased, and the control command amount includes the increase control command amount and the reduction control command amount;

[0072] In a preferred embodiment, the current second power data of each group of energy storage converters is calculated based on the current first power data, including:

[0073] According to the maximum charge capacity of the battery, the state of charge and the maximum charging power, the maximum charging power duration of each group of energy storage converters is calculated;

[0074] Specifically, the maximum charging power duration is calculated according to the following formula:

[0075] T nc =C max ×(1-SOC) / P nc ×60

[0076] Where, T nc Indicates the maximum charging power duration in minutes, C max Indicates the maximum charge capacity of the battery, SOC indicates the state of charge, P nc Indicates the maximum charging power.

[0077] According to the maximum charge capacity of the battery, the state of charge and the maximum discharge power, the maximum discharge power duration of each group of energy storage converters is calculated;

[0078] Specifically, the maximum discharge power duration is calculated according to the following formula:

[0079] T nd =C max ×(1-SOC) / P nd ×60

[0080] Where, T nd Indicates the maximum discharge power duration in minutes, P nd Indicates the maximum discharge power.

[0081] Compare the actual charging and discharging power with the maximum charging power, the maximum charging power duration and the preset maximum charging and discharging demand time value, and determine the actual maximum reversible power according to the comparison result;

[0082] Compare the actual charge and discharge power with the maximum discharge power, the maximum discharge power duration and the preset maximum charge and discharge demand time value, and determine the actual maximum boostable power according to the comparison result;

[0083] The current second power data is composed according to the actual maximum power that can be reduced and the actual maximum power that can be increased.

[0084] In this preferred embodiment, the current second power data of each group of energy storage converters is calculated through the current first power data.

[0085] In another preferred embodiment, comparing the actual charge and discharge power with the maximum discharge power, the maximum discharge power duration and the preset maximum charge and discharge demand time constant, and determining the actual maximum boostable power according to the comparison result, includes:

[0086] If the actual charge and discharge power is not greater than the maximum discharge power and is not less than 0, and the maximum discharge power duration is less than the preset maximum charge and discharge demand time value, then the actual maximum boost power is 0;

[0087] Specifically, the actual maximum boostable power value is a positive number or 0.

[0088] Specifically, by setting the maximum charge and discharge demand time constant T k , as the time threshold for enabling the measure of adjusting the battery pack to the maximum charge and discharge power, the core is that only when the maximum charging power calculated below can last for a duration of T nc Or the maximum discharge power can last for T nd When the required time is greater than the maximum charge and discharge time setting, the power adjustment of the PCS (energy storage converter) is considered.

[0089] Indicatively, if 0≤P 0 ≤P nd , which means that the energy storage converter is in the discharging or shutdown state at this time, and T nd <T k , then the actual maximum power increase of the energy storage converter of this group is ΔP↑=0.

[0090] If the actual charge and discharge power is less than 0, and the maximum discharge power duration is less than the preset maximum charge and discharge demand time value, the opposite of the actual charge and discharge power is used as the actual maximum boostable power;

[0091] Indicatively, if P 0 <0, indicating that the energy storage converter is in the charging state, and Tnd <T k , then the actual maximum power that can be increased by the energy storage converter of this group is ΔP↑=-P 0 .

[0092] If the maximum discharge power duration is not less than the preset maximum charge and discharge demand time value, the difference between the maximum discharge power and the actual charge and discharge power is taken as the actual maximum boostable power.

[0093] Indicatively, if T nd ≥T k , then the actual maximum power that can be increased by the energy storage converter of this group is ΔP↑=P nd -P 0 .

[0094] In this preferred embodiment, the actual maximum power that can be increased for each group of energy storage converters is determined by comparing the actual charging and discharging power with the maximum discharge power, and the maximum discharge power duration with the preset maximum charging and discharging demand time constant.

[0095] In another preferred embodiment, the active power target instruction value of each group of energy storage converters is determined according to the second power data and the control command amount, including:

[0096] Calculate the sum of the above-mentioned actual maximum boostable powers of each group of energy storage converters to obtain a first sum;

[0097] The above-mentioned lifting control command amount is compared with the above-mentioned first sum of each group of energy storage converters, and the active power target instruction value of each group of energy storage converters is determined according to the comparison result and the above-mentioned second power data.

[0098] Specifically, comparing the boost control command amount with the first sum of each group of energy storage converters, and determining the active power target command value of each group of energy storage converters according to the comparison result and the second power data, includes:

[0099] Comparing the lifting control command amount with the first sum of each group of energy storage converters;

[0100] If the boost control command amount is not less than the first sum, the sum of the actual charging and discharging power corresponding to each group of energy storage converters and the actual maximum boostable power is used as the active power target command value of each group of energy storage converters;

[0101] If the lifting control command amount is less than the first sum, the energy storage converters of each group are numbered in order, and the first target instruction calculation operation is repeatedly performed until the first adjustment amount is not less than the lifting control command amount, thereby obtaining a final first adjustment amount;

[0102] Taking each group of energy storage converters corresponding to the final first adjustment amount as the first target energy storage converter, and taking the sum of the actual discharge power and the actual maximum boostable power of each of the first target energy storage converters as the active power target instruction value of each of the first target energy storage converters;

[0103] The active power target command values ​​of the remaining groups of energy storage converters are the above-mentioned actual charging and discharging powers;

[0104] The calculation operation of the first target instruction is:

[0105] Get the number of the current group; the number of the initial group is the first group;

[0106] Calculate the sum of the actual maximum power that can be increased for all groups of energy storage converters that do not exceed the current number size to obtain a first adjustment amount;

[0107] The current first adjustment amount is compared with the above-mentioned lifting control command amount. If the current first adjustment amount is smaller than the above-mentioned lifting control command amount, the number of the next group is obtained.

[0108] Specifically, when executing the above-mentioned first target instruction calculation operation, the first target instruction calculation is performed in sequence according to the numbering order of each group of energy storage inverters and the principle of "minimum overcutting". For the remaining energy storage inverters, their active power target values ​​are the actual charging and discharging powers corresponding to each group of energy storage inverters.

[0109] Preferably, sending an active power target instruction value equal to the actual charging and discharging power to the remaining groups of energy storage converters can prevent interference from other commands and ensure that the grid stability defense line has the highest priority.

[0110] In this preferred embodiment, the active power target instruction value of each group of energy storage converters is determined according to the second power data and the control command quantity.

[0111] In another preferred embodiment, the actual charging and discharging power is compared with the maximum charging power, the maximum charging power duration is compared with the preset maximum charging and discharging demand time value, and the actual maximum power that can be reduced is determined according to the comparison result, including:

[0112] If the actual charging and discharging power is not less than the negative value of the maximum charging power and is not greater than 0, and the maximum charging power duration is less than the preset maximum charging and discharging demand time, then the actual maximum power reduction is 0;

[0113] Specifically, the actual maximum power reduction value is a positive number or 0.

[0114] Indicatively, if -Pnc ≤P 0 ≤0, which means that the energy storage converter is in charging or shutdown state, and T nc <T k , then the actual maximum power reduction of the energy storage converter in this group is ΔP↓=0.

[0115] If the actual charge and discharge power is greater than 0, and the maximum charge power duration is less than the preset maximum charge and discharge demand time, the maximum discharge power is used as the actual maximum fallback power.

[0116] Indicatively, if 0 <P 0 , which means that the energy storage converter is in the discharge state at this time, and T nc <T k , then the actual maximum power reduction of the energy storage converter of this group ΔP↓=P 0 .

[0117] If the maximum charging power can last for no less than the preset maximum charging and discharging demand time value, the sum of the maximum charging power and the actual charging and discharging power shall be taken as the actual maximum fallback power.

[0118] Indicatively, if T nc >T k , then the actual maximum power reduction of the energy storage converter of this group ΔP↓=P nc +P 0 .

[0119] In this preferred embodiment, the actual maximum power that can be reduced for each group of energy storage inverters is determined by comparing the actual charging and discharging power with the maximum charging power, and the relationship between the maximum charging power duration and the preset maximum charging and discharging demand time constant.

[0120] In another preferred embodiment, the active power target instruction value of each group of energy storage converters is determined according to the second power data and the control command amount, including:

[0121] Calculate the sum of the above-mentioned actual maximum power that can be reduced back by each group of energy storage converters to obtain a second sum;

[0122] The above-mentioned fallback control command amount is compared with the above-mentioned second sum of each group of energy storage converters, and the active power target instruction value of each group of energy storage converters is determined according to the comparison result and the above-mentioned second power data.

[0123] Specifically, comparing the fallback control command amount with the second sum of each group of energy storage converters, and determining the active power target command value of each group of energy storage converters according to the comparison result and the second power data, includes:

[0124] Comparing the fallback control command amount with the second sum of each group of energy storage converters;

[0125] If the fallback control command amount is not less than the second sum, the difference between the actual charge and discharge power corresponding to each group of energy storage converters and the actual maximum fallback power is used as the active power target command value of each group of energy storage converters;

[0126] If the above-mentioned fallback control command amount is less than the above-mentioned second sum, then the energy storage converters of each group are numbered in order, and the second target instruction calculation operation is repeatedly performed until the second adjustment amount is not less than the above-mentioned fallback control command amount, and the final second adjustment amount is obtained. The energy storage converters of each group corresponding to the final second adjustment amount are used as the second target energy storage converters, and the difference between the actual discharge power of each of the above-mentioned second target energy storage converters and the actual maximum fallback power is used as the active power target instruction value of each of the above-mentioned second target energy storage converters;

[0127] The active power target command values ​​of the remaining groups of energy storage converters are the above-mentioned actual charging and discharging powers;

[0128] The second target instruction calculation operation is:

[0129] Get the number of the current group; the number of the initial group is the first group;

[0130] Calculate the sum of the actual maximum power that can be reduced for all groups of energy storage converters that do not exceed the current number size to obtain a second adjustment amount;

[0131] The current second adjustment amount is compared with the above-mentioned return-down control command amount. If the current second adjustment amount is smaller than the above-mentioned return-down control command amount, the number of the next group is obtained.

[0132] Preferably, sending an active power target instruction value equal to the actual charging and discharging power to the remaining groups of energy storage converters can prevent interference from other commands and ensure that the grid stability defense line has the highest priority.

[0133] In this preferred embodiment, the active power target instruction value of each group of energy storage converters is determined according to the second power data and the control command quantity.

[0134] In schematic form, it is assumed that a substation A has 30 groups of energy storage converters, each with a maximum charging power of 2.5MW, each with a maximum discharging power of 3MW, a maximum battery charge of 3MWh, a state of charge of 500‰, an actual charge and discharge power of 0, and a maximum charge and discharge demand time of 20min. By calculation, the maximum discharge power duration, maximum charging power duration, actual maximum power reduction, and actual maximum power increase of the energy storage converter of the substation can be obtained as shown in Table 1 below:

[0135] Table 1

[0136]

[0137] Schematically, the sum of the actual maximum power that can be increased and the sum of the actual maximum power that can be reduced of each group of energy storage converters are shown in Table 2:

[0138] Table 2

[0139] Factory Station PCS simulation group number Maximum power increase Σ△P↑ Maximum power reduction Σ△P↓ Station A 30 30*3＝90 30*2.5＝75

[0140] When a control command to increase 100MW is received, since the current control command is not less than the sum of the actual maximum power that can be increased for each group of energy storage inverters (90MW), the actual charging and discharging power corresponding to each group of energy storage inverters and the sum of the actual maximum power that can be increased are calculated in turn as the active power target instruction value of each group of energy storage inverters, and 3MW is calculated. That is, when controlling the 30 groups of energy storage inverters at station A, the active power of each group of energy storage inverters is adjusted from 0 to 3MW.

[0141] When a command to increase the power by 58MW is received, since the current control command amount is less than the sum of the actual maximum power that can be increased by each group of energy storage inverters (90MW), when performing the first target instruction calculation operation, when the 20th group of energy storage inverters is calculated, the current first adjustment amount is 60MW, that is, the current first adjustment amount is greater than the control command amount, then the active power of the energy storage inverter group corresponding to the first adjustment amount is adjusted from 0 to 3MW, and for the remaining 10 groups of energy storage inverters, the active power target instruction value is the corresponding actual charging and discharging power (0MW).

[0142] The ring network switch is used to connect the interface control terminal and each group of energy storage converters;

[0143] The energy storage converter is used to adjust the current active power value according to the active power target command value.

[0144] In a preferred embodiment, the current active power value is adjusted according to the active power target command value, including:

[0145] According to the above active power target command value, the current active power value is adjusted to the above active power target command value.

[0146] Indicatively, if the calculated active power target command value of the energy storage converter of the current group is 5MW, the energy storage converter of this group will respond within 100ms and adjust the active power to 5MW.

[0147] Specifically, the communication protocol application layer protocol between the energy storage converter and the interface control terminal is shown in Appendix 3 and 4:

[0148] Table 3

[0149] Serial number Information point description Data Types Remark 1 Grid connection status Bool 1 Grid-connected, 0 Non-grid-connected 2 Active Power Int32 Unit: kW (discharging is positive, charging is negative) 3 Reactive power Int32 Unit kvar (spare) 4 SOC State of Charge Int32 Thousandths, magnified 1000 times (0.001) 5 Maximum charging power Int32 Unit: kW (positive number) 6 Maximum discharge power Int32 Unit: kW (positive number) 7 Maximum charging capacity Int32 Unit kWh (positive number)

[0150] Table 4

[0151]

[0152] After receiving the control command from the interface control terminal, the energy storage converter shall immediately adjust the battery power to the target value according to the command requirements until receiving the "reset" signal (sequence number 2 in Table 4) issued by the interface control terminal. During this period, the control command priority of other systems in the station shall not be higher than this control command.

[0153] In this preferred embodiment, the current active power value of each group is adjusted by the active power target command value.

[0154] Based on the above-mentioned device item embodiments, the present invention provides corresponding method item embodiments.

[0155] Indicative, such as Figure 2 As shown, another embodiment of the present invention provides a method for coordinated energy storage control adapted to a grid stabilization defense line, comprising:

[0156] Step S101: obtaining current first power data and control command quantity; wherein the first power data includes: actual charging and discharging power, maximum charging power, maximum discharging power, maximum battery charge capacity and state of charge; and the control command quantity includes a boost control command quantity and a drop control command quantity;

[0157] In this step, the actual charging and discharging power, maximum charging power, maximum discharging power, maximum battery charge capacity and charge state of each group of energy storage inverters, and the current control command quantity are obtained.

[0158] Step S102: Calculate the current second power data according to the current first power data; wherein the second power data includes: the actual maximum power that can be reduced and the actual maximum power that can be increased;

[0159] In this step, the actual maximum power that can be reduced and the actual maximum power that can be increased are calculated based on the current first power data.

[0160] Step S103 determines the active power target command value of each group of energy storage converters according to the current second power data and the control command amount, and transmits the active power target command value of each group of energy storage converters to the interface control terminal, so that the interface control terminal distributes the active power target command value to each group of energy storage converters through the ring network switch, so that each group of energy storage converters is adjusted according to the active power target command value;

[0161] Among them, the first end of the above-mentioned interface control terminal is connected to the above-mentioned energy storage execution station stability control device, the second end of the above-mentioned interface control terminal is connected to the first end of the above-mentioned ring network switch, and the second end of the above-mentioned ring network switch is connected to the above-mentioned energy storage inverter; wherein each ring network switch corresponds to a group of energy storage inverters.

[0162] In this step, the active power target value of each group of energy storage inverters is determined through the second power data and the control command quantity, and the active power target value is allocated to each group of energy storage inverters through the interface control terminal and the ring network switch. The energy storage inverter is adjusted according to the obtained active power target value.

[0163] By implementing the above-mentioned embodiments of the present invention, the stabilization and control adjustment time of the power grid energy storage system can be improved, thereby meeting the demand for rapid action of the power grid stabilization and control defense line.

[0164] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also regarded as protection of the present invention.

Claims

1. A storage coordinated control system adapted to the grid stabilization defense line, characterized in that: include: Interface control terminal, energy storage execution station stability control device, several ring network switches and several groups of energy storage converters; The first end of the interface control terminal is connected to the energy storage execution station stabilization control device, the second end of the interface control terminal is connected to the first end of the ring network switch, and the second end of the ring network switch is connected to the energy storage converter; wherein each ring network switch corresponds to a group of energy storage converters; The interface control terminal is used to obtain the current first power data of each group of energy storage converters and distribute the active power target command value of each group of energy storage converters to each group of energy storage converters; wherein the current first power data includes: actual charging and discharging power, maximum charging power, maximum discharging power, maximum battery charge and charge state; The energy storage execution station stabilization control device is used to calculate the current second power data of each group of energy storage converters according to the current first power data, and determine the active power target command value of each group of energy storage converters according to the current second power data and the control command amount, so as to transmit the active power target command value of each group of energy storage converters to the interface control terminal; wherein the current second power data includes: the actual maximum power that can be reduced and the actual maximum power that can be increased, and the control command amount includes the increase control command amount and the reduction control command amount; The ring network switch is used to connect the interface control terminal and each group of energy storage converters; The energy storage converter is used to adjust the current active power value according to the active power target command value.

2. According to claim 1, a storage coordinated control system adapted to the grid stabilization defense line is characterized in that: The step of calculating the current second power data of each group of energy storage converters according to the current first power data includes: Calculate the maximum charging power duration of each group of energy storage converters according to the maximum charging capacity of the battery, the state of charge and the maximum charging power; Calculate the maximum discharge power duration of each group of energy storage converters according to the maximum charge capacity of the battery, the state of charge and the maximum discharge power; Compare the actual charging and discharging power with the maximum charging power, the maximum charging power duration and the preset maximum charging and discharging demand time value, and determine the actual maximum reversible power according to the comparison result; Compare the actual charge and discharge power with the maximum discharge power, the maximum discharge power duration and the preset maximum charge and discharge demand time constant, and determine the actual maximum boostable power according to the comparison result; The current second power data is composed according to the actual maximum power that can be reduced and the actual maximum power that can be increased.

3. The energy storage coordinated control system adapted to the grid stabilization defense line according to claim 2 is characterized in that: The comparing the actual charge and discharge power with the maximum discharge power, the maximum discharge power duration and the preset maximum charge and discharge demand time constant, and determining the actual maximum boostable power according to the comparison result, includes: If the actual charge and discharge power is not greater than the maximum discharge power and is not less than 0, and the maximum discharge power duration is less than the preset maximum charge and discharge demand time value, then the actual maximum boost power is 0; If the actual charge and discharge power is less than 0, and the maximum discharge power duration is less than the preset maximum charge and discharge demand time value, the opposite of the actual charge and discharge power is used as the actual maximum boostable power; If the maximum discharge power can last for no less than the preset maximum charge and discharge demand time value, the difference between the maximum discharge power and the actual charge and discharge power is taken as the actual maximum boostable power.

4. The energy storage coordinated control system adapted to the grid stabilization defense line according to claim 3 is characterized in that: Determining the active power target instruction value of each group of energy storage converters according to the second power data and the control command amount includes: Calculating the sum of the actual maximum boostable powers of each group of energy storage converters to obtain a first sum; The boost control command amount is compared with the first sum of each group of energy storage converters, and the active power target instruction value of each group of energy storage converters is determined according to the comparison result and the second power data.

5. The energy storage coordinated control system adapted to the grid stabilization defense line according to claim 4 is characterized in that: The step of comparing the boost control command amount with the first sum of each group of energy storage converters, and determining the active power target instruction value of each group of energy storage converters according to the comparison result and the second power data, comprises: Comparing the lifting control command amount with the first sum of each group of energy storage converters; If the boost control command amount is not less than the first sum, the sum of the actual charging and discharging power corresponding to each group of energy storage converters and the actual maximum boostable power is used as the active power target command value of each group of energy storage converters; If the lifting control command amount is less than the first sum, the energy storage converters of each group are numbered in order, and the first target instruction calculation operation is repeatedly performed until the first adjustment amount is not less than the lifting control command amount, so as to obtain a final first adjustment amount; Taking each group of energy storage converters corresponding to the final first adjustment amount as the first target energy storage converter, and taking the sum of the actual discharge power and the actual maximum boostable power of each of the first target energy storage converters as the active power target instruction value of each of the first target energy storage converters; The active power target command value of the remaining groups of energy storage converters is the actual charging and discharging power; Wherein, the first target instruction calculation operation is: Get the number of the current group; the number of the initial group is the first group; Calculate the sum of the actual maximum power that can be increased for all groups of energy storage converters that do not exceed the current number size to obtain a first adjustment amount; The current first adjustment amount is compared with the lifting control command amount. If the current first adjustment amount is smaller than the lifting control command amount, the number of the next group is obtained.

6. The energy storage coordinated control system adapted to the grid stabilization defense line according to claim 2 is characterized in that: The comparing the actual charging and discharging power with the maximum charging power, the maximum charging power duration and the preset maximum charging and discharging demand time constant, and determining the actual maximum reversible power according to the comparison result, includes: If the actual charging and discharging power is not less than the negative value of the maximum charging power and is not greater than 0, and the maximum charging power duration is less than the preset maximum charging and discharging demand time value, then the actual maximum power that can be reduced is 0; If the actual charge and discharge power is greater than 0, and the maximum charge power duration is less than the preset maximum charge and discharge demand time value, the maximum discharge power is used as the actual maximum fallback power; If the maximum charging power can last for no less than the preset maximum charging and discharging demand time value, the sum of the maximum charging power and the actual charging and discharging power is taken as the actual maximum reversible power.

7. The energy storage coordinated control system adapted to the grid stabilization defense line according to claim 6 is characterized in that: Determining the active power target instruction value of each group of energy storage converters according to the second power data and the control command amount includes: Calculating the sum of the actual maximum power that can be reduced back by each group of energy storage converters to obtain a second sum; The fallback control command amount is compared with the second sum of each group of energy storage converters, and the active power target instruction value of each group of energy storage converters is determined according to the comparison result and the second power data.

8. The energy storage coordinated control system adapted to the grid stabilization defense line according to claim 7 is characterized in that: The step of comparing the fallback control command amount with the second sum of each group of energy storage converters, and determining the active power target instruction value of each group of energy storage converters according to the comparison result and the second power data, comprises: Comparing the fallback control command amount with the second sum of each group of energy storage converters; If the fallback control command amount is not less than the second sum, the difference between the actual charging and discharging power corresponding to each group of energy storage converters and the actual maximum fallback power is used as the active power target command value of each group of energy storage converters; If the fallback control command amount is less than the second sum, the energy storage converters of each group are numbered in order, and the second target instruction calculation operation is repeatedly performed until the second adjustment amount is not less than the fallback control command amount, and the final second adjustment amount is obtained. The energy storage converters of each group corresponding to the final second adjustment amount are used as the second target energy storage converters, and the difference between the actual discharge power of each of the second target energy storage converters and the actual maximum fallback power is used as the active power target instruction value of each of the second target energy storage converters; The active power target command value of the remaining groups of energy storage converters is the actual charging and discharging power; Wherein, the second target instruction calculation operation is: Get the number of the current group; the number of the initial group is the first group; Calculate the sum of the actual maximum power that can be reduced for all groups of energy storage converters that do not exceed the current number size to obtain a second adjustment amount; The current second adjustment amount is compared with the fallback control command amount. If the current second adjustment amount is smaller than the fallback control command amount, the number of the next group is obtained.

9. An energy storage cooperative control system adapted to the grid stabilization defense line according to any one of claims 5 or 8, characterized in that: The adjusting the current active power value according to the active power target command value comprises: According to the active power target command value, the current active power value is adjusted to the active power target command value.

10. A method for coordinated energy storage control adapted to the grid stabilization defense line, characterized in that: include: Obtaining current first power data and control command quantity; wherein the first power data includes: actual charging and discharging power, maximum charging power, maximum discharging power, maximum battery charge capacity and state of charge, and the control command quantity includes an increase control command quantity and a decrease control command quantity; According to the current first power data, current second power data is calculated; wherein the second power data includes: an actual maximum power that can be reduced and an actual maximum power that can be increased; Determine the active power target command value of each group of energy storage converters according to the current second power data and the control command amount, and transmit the active power target command value of each group of energy storage converters to the interface control terminal, so that the interface control terminal distributes the active power target command value to each group of energy storage converters through the ring network switch, so that each group of energy storage converters is adjusted according to the active power target command value; Among them, the first end of the interface control terminal is connected to the energy storage execution station stability control device, the second end of the interface control terminal is connected to the first end of the ring network switch, and the second end of the ring network switch is connected to the energy storage inverter; wherein each ring network switch corresponds to a group of energy storage inverters.

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