Energy storage collaborative control system and method adapted to power grid stabilization defense line

Abstract

The present invention discloses a collaborative energy storage control system and method adapted to a power grid stabilization and control line. The system comprises: an interface control terminal, an energy storage execution station stabilization and control device, several ring network switches, and several groups 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 instruction value to each group of energy storage converters; the energy storage execution station stabilization and control device is used to calculate the current second power data based on the current first power data, and determine the active power target instruction value of each group of energy storage converters based on the current second power data and the control command amount, and transmit it to the interface control terminal; the ring network switch is used to connect the interface control terminal with each group of energy storage converters; the energy storage converter is used to adjust according to the active power target instruction value. By implementing the present invention, the stabilization and control adjustment time of the power grid energy storage system can be improved, meeting the requirements of the rapid action of the power grid stabilization and control line.

Description

Technical Field

[0001] The present invention relates to the field of energy storage collaborative control technology, 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 defense 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 existing technology, the conventional automatic power generation control and adjustment time of the energy storage system is generally 1 to 2 seconds, which cannot meet the requirements of rapid action of the grid stabilization defense line. Summary of the Invention

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

[0005] An embodiment of the present invention provides an energy storage coordination system adapted to a grid stabilization and control defense line, comprising: an interface control terminal, an energy storage execution station stabilization and 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; wherein each ring network switch corresponds to a group of energy storage converters;

[0007] The interface control terminal is configured to obtain current first power data of each group of energy storage converters and distribute active power target command values ​​of each group of energy storage converters to each group of energy storage converters; wherein the current first power data includes actual charge and discharge power, maximum charge power, maximum discharge power, maximum battery charge capacity, and state of charge;

[0008] The energy storage execution station stabilization control device is configured to calculate the current second power data of each of the energy storage converter groups based on the current first power data, and determine the active power target command value of each of the energy storage converter groups based on the current second power data and the control command amount, so as to transmit the active power target command value of each of the energy storage converter groups 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 the energy storage converter groups;

[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] Calculate the maximum charging power duration of each group of energy storage converters based on the maximum charging capacity of the battery, the state of charge, and the maximum charging power;

[0013] Calculate the maximum discharge power duration of each group of energy storage converters based on the maximum charge capacity of the battery, the state of charge, and the maximum discharge power;

[0014] Compare the actual charge and discharge power with the maximum charge power, the maximum charge power duration and the preset maximum charge and discharge demand time value, and determine the actual maximum fallback power based on the comparison result;

[0015] 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 based on 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, and determining the actual maximum boostable power based on the comparison results, 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, 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 required time value, the inverse 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 used as the actual maximum boostable power.

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

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

[0023] 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.

[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 based on the comparison result and the second power data, includes:

[0025] Comparing the boost 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 charge and discharge 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 boost control command amount is less than the first sum, the energy storage converter groups are numbered in order, and the first target instruction calculation operation is repeatedly performed until the first adjustment amount is not less than the boost control command amount, thereby obtaining a final first adjustment amount;

[0028] The energy storage converters of each group corresponding to the final first adjustment amount are used as first target energy storage converters, and the sum of the actual discharge power and the actual maximum boostable power of each of the first target energy storage converters is used 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 energy storage converters are the above-mentioned actual charge and discharge powers;

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

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

[0032] Calculate the sum of the actual maximum boostable powers of 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 charge and discharge power with the maximum charge power, and the maximum charge power duration with a preset maximum charge and discharge demand time, and determining the actual maximum reversible power according to the comparison result, includes:

[0035] If the actual charge and discharge power is not less than the negative value of the maximum charging power and not greater than 0, and the maximum charging power duration is less than the preset maximum charge and discharge demand time, then the actual maximum fallback power 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 duration is not less than the preset maximum charging and discharging demand time, the sum of the maximum charging power and the actual charging and discharging power is used as the actual maximum fallback power.

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

[0039] Calculating the sum of the actual maximum power that can be reduced in each group of energy storage converters to obtain a second sum;

[0040] The fallback control command value 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.

[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 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 a final second adjustment amount is obtained. The energy storage converters of each group corresponding to the final second adjustment amount are used as second target energy storage converters, and the difference between the actual discharge power of each second target energy storage converter and the actual maximum fallback power is used as the active power target instruction value of each second target energy storage converter.

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

[0046] The second target instruction calculation operation is:

[0047] Get the current group number; the initial group number 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 adjusting the current active power value according to the active power target command value includes:

[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 corresponding method item embodiment;

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

[0054] Obtaining current first power data and a control command; wherein the first power data includes: actual charge and discharge power, maximum charge power, maximum discharge power, maximum battery charge capacity, and state of charge; and the control command includes a boost control command and a drop control command;

[0055] Calculating the current second power data 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 active power target command values ​​for each of the energy storage converter groups based on the current second power data and the control command amount, and transmit the active power target command values ​​for each of the energy storage converter groups to the interface control terminal, so that the interface control terminal distributes the active power target command values ​​to each of the energy storage converter groups through the ring network switch, so that each of the energy storage converter groups is adjusted according to the active power target command values;

[0057] Among them, the first end of the above-mentioned interface control terminal is connected to the above-mentioned energy storage execution station stabilization 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; 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 collaborative system and method that adapts to the power grid stabilization and control line. The above system includes: an interface control terminal, an energy storage execution station stabilization and control device, several ring network switches and several 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 and 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; 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 converters based on the above-mentioned current first power data, and determine the active power target instruction value of the above-mentioned groups of energy storage converters based on 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 converters 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 and the above-mentioned groups of energy storage converters; the above-mentioned energy storage converter 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 stabilization 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 instruction value of each group of energy storage converters obtained from the energy storage execution station stabilization control device, and then adjusts the current active power according to the target instruction value to achieve energy storage stabilization control. Among them, since the energy storage converter can respond and adjust the active power within 100ms after receiving the active power target instruction value, the stabilization adjustment time of the power grid energy storage system is greatly improved, meeting the demand for rapid action of the power grid stabilization defense line. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0062] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0063] like Figure 1 As shown, an embodiment of the present invention provides an energy storage collaborative control system adapted to a grid stabilization defense line, comprising:

[0064] Interface control terminal, energy storage execution station stabilization 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; wherein each ring network switch corresponds to a group of energy storage converters;

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

[0067] Optimally, the substation establishes an independent ring or star-shaped communication network (including communication cables and switches), physically isolated from other communication networks within the station. This allows interface control terminals to control each group of energy storage converters. Each ring switch can connect to one or more energy storage converters, depending on the actual situation. Furthermore, the communication network should adopt a ring architecture to ensure that normal communication capabilities can be maintained even if any communication link fails. Furthermore, when the interface control terminal communicates externally, network storms should be avoided.

[0068] The interface control terminal is configured to obtain current first power data of each group of energy storage converters and distribute active power target command values ​​of each group of energy storage converters to each group of energy storage converters; wherein the current first power data includes actual charge and discharge power, maximum charge power, maximum discharge power, maximum battery charge capacity, and state of charge;

[0069] Specifically, when the value of the above-mentioned first power data is a positive number, the energy storage converter of the current group is in a discharging state; when the value is a negative number, the energy storage converter of the current group is in a charging state; when the value is 0, the energy storage converter 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 configured to calculate the current second power data of each of the energy storage converter groups based on the current first power data, and determine the active power target command value of each of the energy storage converter groups based on the current second power data and the control command amount, so as to transmit the active power target command value of each of the energy storage converter groups 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] Calculate the maximum charging power duration of each group of energy storage converters based on the maximum charging capacity of the battery, the state of charge, and the maximum charging power;

[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] Calculate the maximum discharge power duration of each group of energy storage converters based on the maximum charge capacity of the battery, the state of charge, and the maximum discharge power;

[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 charge and discharge power with the maximum charge power, the maximum charge power duration and the preset maximum charge and discharge demand time value, and determine the actual maximum fallback power based on the comparison result;

[0082] 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 based on 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 using 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 value, and determining the actual maximum boostable power based on the comparison results 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, 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 Only when the required charge and discharge time is greater than the maximum set value, the power adjustment of the PCS (energy storage converter) is considered.

[0089] Indicatively, if 0≤P0≤P nd , which means that the energy storage converter is in the discharge or shutdown state, and T nd <T k , then the actual maximum power that can be increased by 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 required time value, the inverse of the actual charge and discharge power is used as the actual maximum boostable power;

[0091] Indicatively, if P0<0, it means that the energy storage converter is in the charging state, and T nd <T k, then the actual maximum power that can be increased by the energy storage converter of this group is ΔP↑=-P0.

[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 used 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 -P0.

[0094] In this preferred embodiment, the actual maximum boostable power of each group of energy storage converters is determined by comparing the actual charge and discharge power with the maximum discharge power, and the maximum discharge power duration with the preset maximum charge and discharge demand time value.

[0095] In another preferred embodiment, the determining of 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:

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

[0097] 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.

[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 based on the comparison result and the second power data, includes:

[0099] Comparing the boost 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 charge and discharge 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 boost control command amount is less than the first sum, the energy storage converter groups are numbered in order, and the first target instruction calculation operation is repeatedly performed until the first adjustment amount is not less than the boost control command amount, thereby obtaining a final first adjustment amount;

[0102] The energy storage converters of each group corresponding to the final first adjustment amount are used as first target energy storage converters, and the sum of the actual discharge power and the actual maximum boostable power of each of the first target energy storage converters is used 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 energy storage converters are the above-mentioned actual charge and discharge powers;

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

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

[0106] Calculate the sum of the actual maximum boostable powers of 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 converters and the principle of "minimum overcutting". For the remaining energy storage converters, their active power target values ​​are the actual charging and discharging powers corresponding to each group of energy storage converters.

[0109] Preferably, an instruction with an active power target instruction value equal to the actual charge and discharge power is sent to the remaining groups of energy storage converters, which 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 based on the second power data and the control command amount.

[0111] In another preferred embodiment, comparing the actual charge and discharge power with the maximum charge power, and comparing the maximum charge power duration with a preset maximum charge and discharge demand time value, and determining the actual maximum fallback power based on the comparison result, includes:

[0112] If the actual charge and discharge power is not less than the negative value of the maximum charging power and not greater than 0, and the maximum charging power duration is less than the preset maximum charge and discharge demand time, then the actual maximum fallback power is 0.

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

[0114] Indicatively, if-P nc≤P0≤0, which indicates that the energy storage converter is in the charging or shutdown state at this time, and T nc <T k , then the actual maximum power that can be reduced, ΔP↓, of the energy storage converters in this group is 0.

[0115] If the above actual charge-discharge power is greater than 0, and the sustainable time of the above maximum charging power is less than the above preset maximum charge-discharge demand time constant, then the above maximum discharge power is taken as the above actual maximum power that can be reduced;

[0116] Schematically, if 0 < P0, which indicates that the energy storage converter is in the discharging state at this time, and T nc <T k , then the actual maximum power that can be reduced, ΔP↓, of the energy storage converters in this group is P0.

[0117] If the sustainable time of the above maximum charging power is not less than the above preset maximum charge-discharge demand time constant, then the sum of the above maximum charging power and the above actual charge-discharge power is taken as the above actual maximum power that can be reduced.

[0118] Schematically, if T nc >T k , then the actual maximum power that can be reduced, ΔP↓, of the energy storage converters in this group is P nc +P0.

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

[0120] In another preferred embodiment, the above-mentioned determining the active power target command value for each group of energy storage converters according to the above-mentioned second power data and the control command quantity includes:

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

[0122] Comparing the above-mentioned power reduction control command quantity with the above-mentioned second sum of each group of energy storage converters, and determining the active power target command value for each group of energy storage converters according to the comparison result and the above-mentioned second power data.

[0123] Specifically, the above-mentioned comparing the above-mentioned power reduction control command quantity with the above-mentioned second sum of each group of energy storage converters, and determining the active power target command value for each group of energy storage converters according to the comparison result and the above-mentioned second power data includes:

[0124] Comparing the above-mentioned power reduction control command quantity with the above-mentioned 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 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 a final second adjustment amount is obtained. The energy storage converters of each group corresponding to the final second adjustment amount are used as second target energy storage converters, and the difference between the actual discharge power of each second target energy storage converter and the actual maximum fallback power is used as the active power target instruction value of each second target energy storage converter.

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

[0128] The second target instruction calculation operation is:

[0129] Get the current group number; the initial group number 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, an instruction with an active power target instruction value equal to the actual charge and discharge power is sent to the remaining groups of energy storage converters, which 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 based on the second power data and the control command amount.

[0134] For example, let's assume that a substation A has 30 energy storage converters, each with a maximum charging power of 2.5MW and a maximum discharging power of 3MW. The maximum battery charge capacity is 3MWh, the state of charge is 500‰, the actual charge and discharge power is 0, and the maximum charge and discharge demand time is 20 minutes. The maximum discharge power duration, maximum charging power duration, actual maximum power reduction, and actual maximum power increase values ​​of the substation's energy storage converters can be calculated 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] Plant Station Number of PCS simulation groups Maximum power boost Σ△P↑ Maximum power reduction Σ△P↓ Station A 30 30*3＝90 30*2.5＝75

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

[0141] When a power increase command of 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 converters (90MW), when performing the first target instruction calculation operation, when the 20th group of energy storage converters 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 converters in the group corresponding to the first adjustment amount is adjusted from 0 to 3MW. For the remaining 10 groups of energy storage converters, 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 the energy storage converter groups;

[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 adjusting of the current active power value according to the active power target command value includes:

[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 converters in the current group is 5 MW, the energy storage converters in this group will respond within 100 ms and adjust the active power to 5 MW.

[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 Type Remark 1 Grid-connected status Bool 1 grid-connected, 0 non-grid-connected 2 Active power Int32 Unit: kW (discharge is positive, charge 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] Upon receiving a control command from the interface control terminal, the energy storage converter must immediately adjust the battery power to the target value as required by the command until it receives a "reset" signal (number 2 in Table 4) from the interface control terminal. During this period, control commands from other systems within the station must not take precedence over 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 embodiment, the present invention provides a corresponding method embodiment.

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

[0156] Step S101: Obtaining current first power data and control command values; wherein the first power data includes actual charge and discharge power, maximum charge power, maximum discharge power, maximum battery charge capacity, and state of charge; and the control command values ​​include a boost control command value and a drop control command value.

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

[0158] Step S102: Calculating current second power data based on the current first power data; wherein the second power data includes: an actual maximum power that can be reduced and an 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 the energy storage converters based on the current second power data and the control command amount, and transmits the active power target command value of each group of the 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 the energy storage converters through the ring network switch, so that each group of the 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 stabilization 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; 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 converters is determined through the second power data and the control command quantity, and the active power target value is distributed to each group of energy storage converters through the interface control terminal and the ring network switch. The energy storage converter is adjusted according to the obtained active power target value.

[0163] By implementing the above-mentioned embodiments of the present invention, the stabilization and 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 is a preferred embodiment 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 coordinated energy storage control system adapted to the grid stabilization defense line, characterized in that: include: Interface control terminal, energy storage execution station stabilization 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 configured to obtain current first power data of each group of energy storage converters and distribute active power target command values ​​of each group of energy storage converters to each group of energy storage converters; wherein the current first power data includes: actual charge and discharge power, maximum charge power, maximum discharge power, maximum battery charge capacity, and state of charge; The energy storage execution station stabilization control device is configured to calculate the current second power data of each group of energy storage converters based on the current first power data, and determine the active power target instruction value of each group of energy storage converters based on the current second power data and the control command amount, so as to transmit the active power target instruction 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 instruction value.

2. The energy storage coordinated control system adapted to the grid stabilization defense line according to claim 1 is characterized in that: The calculating, based on the current first power data, current second power data of each group of energy storage converters includes: Calculate the maximum charging power duration of each group of energy storage converters based on the maximum charge 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 based on the maximum charge capacity of the battery, the state of charge, and the maximum discharge power; Comparing the actual charge and discharge power with the maximum charge power, the maximum charge power duration and a preset maximum charge and discharge demand time value, and determining the actual maximum fallback power according to the comparison result; 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; 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 value, 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 required time value, the inverse of the actual charge and discharge power is used as the actual maximum boostable power; If the maximum discharge power duration is not less than the preset maximum charge and discharge required time value, the difference between the maximum discharge power and the actual charge and discharge power is used 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: The determining, based on the second power data and the control command amount, the active power target instruction value of each group of energy storage converters 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, includes: Comparing the boost 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 charge and discharge 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 boost control command amount is less than the first sum, the energy storage converter groups are numbered in order, and the first target instruction calculation operation is repeatedly performed until the first adjustment amount is not less than the boost control command amount, thereby obtaining a final first adjustment amount; The energy storage converters of each group corresponding to the final first adjustment amount are used as first target energy storage converters, and the sum of the actual discharge power and the actual maximum boostable power of each of the first target energy storage converters is used as the active power target instruction value of each of the first target energy storage converters; The active power target instruction value of the remaining groups of energy storage converters is the actual charge and discharge power; The first target instruction calculation operation is: Get the current group number; the initial group number is the first group; Calculate the sum of the actual maximum boostable powers of 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 charge and discharge power with the maximum charge power, the maximum charge power duration and a preset maximum charge and discharge demand time value, and determining the actual maximum fallback power according to the comparison result includes: If the actual charge and discharge power is not less than the negative value of the maximum charging power and not greater than 0, and the maximum charging power duration is less than the preset maximum charge and discharge demand time, then the actual maximum fallback power 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 required time value, the maximum discharge power is used as the actual maximum fallback power; If the maximum charging power duration is not less than the preset maximum charging and discharging required time value, the sum of the maximum charging power and the actual charging and discharging power is used as the actual maximum fallback power.

7. The energy storage coordinated control system adapted to the grid stabilization defense line according to claim 6, characterized in that: The determining, based on the second power data and the control command amount, the active power target instruction value of each group of energy storage converters includes: Calculating the sum of the actual maximum power that can be reduced in each group of energy storage converters to obtain a second sum; The fallback control command value 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 value 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, includes: 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 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; If the fallback control command amount is less than the second sum, the energy storage converters of each group are numbered in sequence, 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 a final second adjustment amount is obtained. The energy storage converters of each group corresponding to the final second adjustment amount are used as second target energy storage converters, and the difference between the actual discharge power of each second target energy storage converter and the actual maximum fallback power is used as the active power target instruction value of each second target energy storage converter; The active power target instruction value of the remaining groups of energy storage converters is the actual charge and discharge power; The second target instruction calculation operation is: Get the current group number; the initial group number 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 coordinated 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 includes: 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 a control command; wherein the first power data includes: actual charge and discharge power, maximum charge power, maximum discharge power, maximum battery charge capacity, and state of charge; and the control command includes a boost control command and a drop control command; Calculating current second power data based on the current first power data; wherein the second power data includes: an actual maximum power that can be reduced and an actual maximum power that can be increased; Determine active power target command values ​​for each group of energy storage converters based on the current second power data and the control command amount, and transmit the active power target command values ​​for each group of energy storage converters to an interface control terminal, so that the interface control terminal distributes the active power target command values ​​to each group of energy storage converters through a ring network switch, so that each group of energy storage converters is adjusted according to the active power target command values; Among them, 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 inverter; each ring network switch corresponds to a group of energy storage inverters.

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