CN110021930B - Large-scale energy storage participation power grid partition control method and system - Google Patents

Abstract

The invention discloses a method and a system for participating in power grid partition control through large-scale energy storage, wherein the method comprises the following steps: adopting a partition setting control mode to carry out centralized control on the energy storage power stations in the partitions, and formulating distribution strategies of the energy storage power stations in the partitions according to respective partition control targets and partition attributes; the energy storage power station uploads a self attribute value to the partition; and the energy storage power station participates in centralized control of the subarea. The invention realizes the centralized control of the energy storage power station through the subareas and the reasonable charge and discharge power control of the energy storage power station, thereby realizing the consideration of the economic benefit, the subarea balance and the safety control of the energy storage power station.

Description

A method and system for large-scale energy storage to participate in grid partition control

technical field

The invention belongs to the field of power system control, and more specifically, the invention relates to a method and system for large-scale energy storage to participate in grid partition control.

Background technique

The 220kV subregional operation of the provincial power grid and related network analysis and optimization are the fundamental measures to limit short-circuit current. At present, the provincial power grid companies use the 500kV grid as the main network to undertake the power transmission between subregions, and the 220kV power supply lines in each subregion are used for power transmission. An independent network structure forming a radial or partial ring network. Each sub-grid is relatively independent in normal mode, can support each other, and meet the requirements of 500kV main transformer and 220kV line steady state N-1 and N-2.

With the implementation of policies such as industrial structure adjustment and energy conservation and emission reduction, the power grid gradually eliminates outdated production capacity and shuts down old thermal power units. The characteristics of mature electrochemical energy storage technology and short construction period have become the primary choice for power grid replacement power. Through the construction of large-scale energy storage power stations, the power grid is used to make up for the tense situation of power supply after the decommissioning of thermal power plants. The power output characteristics of energy storage are significantly different from conventional power sources, with fast charge-discharge conversion and command tracking capabilities. For the energy storage power station connected to the 10kV distribution network on a large scale, it is of great significance to solve the balance of power generation and consumption and section safety through the centralized control of provincial regulation, peak shaving and valley filling and power dispatching.

Document 1 "Research on Automatic Power Generation Control Strategies Involving Energy Storage Resources Participation" (Chinese Journal of Electrical Engineering, Vol. 34, No. 29, Page 5080, 2014) discloses two control strategies for energy storage resources to participate in AGC. According to the size of the regional regulation demand (ARR), the dynamic distribution ratio coefficient of energy storage is determined. When the ARR is in the emergency area, the energy storage assumes a larger proportion of regulation; the other is to divide the frequency regulation demand into high-frequency part and low-frequency part, respectively. It is borne by energy storage resources and traditional units to give full play to the advantages of each frequency regulation resource and improve the effect of frequency regulation control.

The two control strategies for energy storage resources to participate in AGC proposed in Literature 1 focus on solving the distribution strategy of energy storage and conventional power in real-time grid operation when participating in regional control deviation (ACE) adjustment, and this strategy uses energy storage in modeling. It is equivalent to a conventional unit, without considering the constraints of the remaining power of the energy storage or the state of charge (SOC, State Of Charge), and the regulated power between the energy storage power stations is allocated according to the adjustable capacity, and the SOC of the energy storage power station is not taken into account. Impact.

Document 2 "Research on the Optimization Strategy of Constant Power Peak Shaving and Valley Filling in Battery Energy Storage Systems" (Power Grid Technology Vol. 36, Issue 9, Page 232) discloses an optimization model and solution algorithm for constant power peak shaving and valley filling of battery energy storage systems. It can quickly solve the charging and discharging strategy of the battery energy storage system under the condition that the battery is charged once a day and discharged many times, and can be quickly optimized before the day. On the basis of constant power charging and discharging, changing the model parameters in the real-time control stage can flexibly control the charging and discharging of the battery, and realize the function of peak shaving and valley filling.

In the real-time control strategy for peak shaving described in Reference 2, in the real-time control phase, the starting time of charging and discharging is determined by the threshold of real-time load; the calculation of charging and discharging power is based on the previously optimized charging and discharging energy divided by the charging and discharging time. Due to the relatively small proportion of energy storage system load, this strategy still uses the strategy of "one charge and one discharge" to assist in grid peak regulation.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve at least one of the above technical problems. On the basis of the centralized control of provincial dispatch, a method and system for large-scale energy storage to participate in grid partition control are proposed, the relationship between energy storage power stations and partitions is established, and the grid control is taken into account. Control objectives for districts and partitions.

For realizing above technical purpose, the present invention adopts following technical scheme:

A method for large-scale energy storage to participate in power grid partition control, which includes implementing conventional automatic power generation control of provincial power grids with the goal of maintaining regional control deviations in the control area to meet control performance assessment requirements, and further comprising:

The energy storage power station uploads its own attribute value to the partition where it is located;

The partition implements centralized control of the energy storage power stations in the partition through the preset control mode;

The partition formulates the power distribution strategy among the energy storage power stations in the partition according to the control objectives of each partition, the partition attributes, and the attribute values uploaded by the energy storage power stations in the partition.

In the above technical solution, further, the centralized control of the energy storage power stations in the partition by the partition through the preset control mode includes:

When the partition is set to discharge mode, the energy storage power station in the partition discharges with the maximum discharge power;

When the partition is set to charging mode, the energy storage power station in the partition is charged with the maximum charging power;

When the partition is set to normal mode, the energy storage power stations in the partition automatically track the power distribution results between the energy storage power stations specified in the partition.

Further, the energy storage power station participates in the centralized control of the partition where it is located through a preset working mode, and the preset mode includes: a charging mode, a discharging mode and a base point mode;

In the charging mode, if the regional adjustment demand is positive, and it is in the sub-emergency area or the emergency area, the 0-power command is executed; in other cases, the charging is performed at the maximum charging power until the battery is fully charged;

In the discharge mode, if the regional adjustment demand is negative, and it is in the sub-emergency area or the emergency area, the 0-power command is executed; in other cases, the discharge is performed at the maximum discharge power until the power is discharged;

In the base point mode, the base point power is automatically tracked, and the base point power is derived from the distribution result of the partition control target.

Preferably, the partition attributes include: partition name, control mode, control target, distribution strategy, total output of energy storage power stations in the partition, number of controllable power stations, number of uncontrollable power stations, total output of controllable power stations, and uncontrollable power stations Total output, state of charge of zonal energy storage, and installed capacity.

Preferably, the attribute value of the energy storage power station itself includes: SOC measurement uploaded by the energy storage power station, upper and lower limits of SOC, maximum charging power, maximum discharging power, maximum charging power time, maximum discharging power time, charging lock, discharge lock, The attributes of charging completion and discharge completion, as well as the control area and partition to which the energy storage power station belongs.

Further, according to the control objectives of each partition, the partition attributes, and the attribute values uploaded by the energy storage power stations, the method for formulating the allocation strategy between the energy storage power stations in the partition is as follows:

1) Count the active power of the uncontrollable energy storage power station in the partition and calculate the total power of the uncontrollable energy storage power station;

2) Subtract the total power of the uncontrollable energy storage power station from the partition control target as the total adjustment capacity of the controllable energy storage power station in the partition;

3) Sort each controllable energy storage power station according to the total adjustment capacity of the partition. If the total adjustment capacity is positive, the active power will be sorted in descending order; if the total adjustment capacity is negative, the active power will be sorted in ascending order. the order of sorting;

If the total regulation capacity of the partition is greater than 0 and the active power of the energy storage power station i is less than 0, the control target P _des,i of the energy storage power station is:

Among them, P _reg is the total regulation capacity of the partition; P _gen,i is the active power of the energy storage power station i;

If the total regulation capacity of the partition is less than 0 and the active power of the energy storage power station i is greater than 0, the control objective P _des,i of the energy storage power station is:

5) The regulation capacity _Preg,i that has been called by the energy storage power station i is:

P _reg,i =P _des,i -P _gen,i (3),

The total adjustment capacity of the partition minus the adjustment capacity called by the energy storage power station i is used to update the total adjustment capacity of the partition, and its expression is:

_Preg ' = _{Preg - Preg,i} (4),

where _Preg ' is the updated total adjustment capacity of the partition.

The updated total adjustment capacity of the partition is taken as the total adjustment capacity of the partition, and returns to 4) iteration until the allocation of the total adjustment capacity of the partition ends or there is no energy storage power station that is opposite to the total adjustment capacity of the partition available for calling;

6) If the total adjustment capacity of the partition still remains, recalculate the control target of all controllable energy storage power stations; the distribution coefficient of each controllable energy storage power station is:

If the total adjustment capacity of the partition is greater than 0,

If the total adjustment capacity of the partition is less than 0,

In the formula, _ki is the distribution coefficient of the energy storage power station; soc _max is the upper limit of the SOC of the energy storage power station; soc _now is the measured value of the SOC of the energy storage power station; soc _min is the lower limit of the SOC of the energy storage power station;

7) Sort the distribution coefficients in descending order. If the total adjustment capacity of the partition is greater than 0, the energy storage power stations will be called in order according to the maximum discharge power; if the total adjustment capacity of the partition is greater than 0, the energy storage power stations will be called in order according to the maximum charging power. call until the call ends;

8) Calculate and update the control objectives of each energy storage power station in a rolling manner according to a fixed period.

Preferably, when the partition and the control area control the energy storage power station at the same time, the priority of the partition is higher than that of the control area.

In another aspect, the present invention provides a system for large-scale energy storage to participate in grid partition control, comprising: a control area, a partition, and an energy storage power station;

The control area is used to implement the conventional automatic power generation control of the provincial power grid with the goal of maintaining the regional control deviation ACE of the control area to meet the control performance assessment requirements;

The energy storage power station uploads its own attribute value to the partition where it is located;

The partition is used to formulate a distribution strategy of the energy storage power station in the partition according to the control target of each partition, the attributes of the energy storage power station in the partition, and the attribute value uploaded by the energy storage power station in the partition;

The partition is also used to implement centralized control of the energy storage power stations in the partition through a preset control mode.

The beneficial effects obtained by the present invention:

1. The present invention is aimed at the partition of the power grid connected to the large-scale energy storage power station. Through the corresponding relationship between the energy storage power station and the partition, the centralized control of the energy storage power station is realized through the partition, so as to meet the balance of power generation and consumption under normal conditions of the partition and emergency situations. Section safety requirements under the following;

2. The partitioned control mode proposed by the present invention can meet the requirements of rapid power adjustment and precise control;

3. The energy storage power station participates in the partition control work mode, and realizes the rolling update of the participation and exit of the partition control and the target output in a definite way;

4. According to their respective partition control objectives and partition attributes, the distribution strategy of energy storage power stations in the partition is formulated, taking into account the output status, charging and discharging state conversion, output adjustment, and charging of the controllable and uncontrollable energy storage power stations in the partition. The state (SOC) rolling calculates the allocated capacity of each energy storage power station, which makes the control method more reasonable and reliable.

Description of drawings

Figure 1: Schematic diagram of the dead zone, normal zone, sub-emergency zone and emergency zone for regional adjustment needs;

Fig. 2 is a flow chart of power distribution among energy storage power stations according to a specific embodiment of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

Embodiment: A method for large-scale energy storage to participate in grid partition control, comprising:

To maintain the regional control deviation of this control area to meet the control performance assessment requirements as the control goal, implement the conventional automatic power generation control of the provincial power grid;

The energy storage power station uploads its own attribute value to the partition where it is located;

The partition implements centralized control of the energy storage power stations in the partition through the preset control mode; the partition formulates the power distribution strategy between the energy storage power stations in the partition according to the control objectives of each partition, the partition attributes, and the attribute values uploaded by the energy storage power stations in the partition.

In the prior art, the regional power grid usually adopts the mode of sub-provincial adjustment and hierarchical management. The basic principle of automatic generation control (AGC, Automatic Generation Control) in the interconnected system is to implement the exchange of power between regions on the premise of ensuring the frequency quality of the system. plan. It is divided into different control areas according to the sub-division, the electrical boundary of each province and the power supply composition. According to the ownership of the power generation unit (power source) in the power grid, the direct regulation unit and the provincial regulation unit are divided, and they are directly dispatched and controlled by the control area to which they belong.

The control goal of the provincial power grid control area is to maintain the regional control error (ACE, Area Control Error) of the control area to meet the control performance assessment requirements. The main assessment standards include A (Criteria A1/A2) standard and CPS (Control Performance Standard) standard . The provincial power grid control area calculates the control area ACE and Area Regulation Requirement (ARR, Area Regulation Requirement) through frequency, planned exchange power, and actual exchange power, and allocates ARR to each unit.

After the 220kV subregion of the provincial power grid is operated, each subregion should ensure the balance of power generation and consumption in this subregion and the safety of key transmission sections, so as to avoid the overload of the 500kV main transformer during the peak load period, and the power flow of the 200kV transmission line in the subregion. The conventional automatic power generation control of the conventional provincial power grid adopts the prior art, which will not be repeated here.

The attributes of the energy storage power station in the specific embodiment include, in addition to the attributes and parameters of the conventional unit, such as the installed capacity, adjustment range, maximum command, adjustment rate, command dead zone, remote controllable signal, etc. SOC measurement, SOC upper and lower limits, maximum charging power, maximum discharging power, maximum charging power time, maximum discharging power time, charging blocking, discharging blocking, charging completion and discharging completion, and other attributes, as well as the control of the manually defined energy storage power station area and the subarea to which it belongs.

The energy storage power station participates in the partition control through the preset working mode. The preset working modes include charging mode, discharging mode, and base point mode. The control mode of the energy storage power station can be automatically switched according to the partition control mode and control target.

The charging mode is: if the regional adjustment demand is positive, and it is in a sub-emergency area or an emergency area, the 0-power command is executed; in other cases, the charging is performed at the maximum charging power until the battery is fully charged;

The discharge mode is: charge according to the maximum discharge power until the power is fully discharged, and try to avoid the discharge behavior from deteriorating the active power balance in the area in an emergency; if the regional adjustment demand is negative, and it is in a sub-emergency area or an emergency area, execute 0 power command; in other cases, the discharge is carried out at the maximum discharge power;

The base point mode is: automatic tracking of the base point power, and the base point power is derived from the allocation result of the partition control target.

Usually, AGC divides ACE into dead zone, normal regulation zone, sub-emergency regulation zone and emergency regulation zone according to the size of regional regulation requirement ARR and a given static threshold value, as shown in Figure 1.

In a specific embodiment, if the partition control mode is "one-key charging", the control mode of each energy storage power station in the partition is automatically changed to "charging mode"; if the partition control mode is "one-key discharge", then each energy storage station in the partition The power station control mode is automatically changed to "discharge mode"; if the zone control mode is "normal" and the control target is not equal to 0, the control mode of each energy storage power station in the zone is automatically converted to "base point mode", and the base point power is determined by the zone according to each zone. According to the control objectives, partition attributes, and attribute values uploaded by the energy storage power stations in the partition, the power distribution strategy between the energy storage power stations in the partition is formulated to obtain the distribution results.

If the working condition of the energy storage power station is abnormal, the energy storage power station can be manually withdrawn from the partition control and switched to other control modes. When the energy storage power station defines the attributes of the control area and the partition at the same time, the energy storage power station can participate in the ACE adjustment of the control area, and can also participate in the centralized control of the partition. When the partition and the control area control the energy storage power station at the same time, the partition takes priority higher than the control area. When the partition has no control requirements, it can participate in the adjustment task of the control area.

The large-scale energy storage power station is connected to the medium and low voltage distribution network and belongs to a certain power grid partition in the provincial network to realize the centralized control of the remote controllable energy storage power station in the partition;

In the specific embodiment, the partition implements centralized control of the energy storage power stations in the partition through a preset control mode, including:

When the partition is set to discharge mode, the energy storage power station in the partition discharges with the maximum discharge power;

When the partition is set to charging mode, the energy storage power station in the partition is charged with the maximum charging power;

When the partition is set to normal mode, the energy storage power stations in the partition automatically track the power distribution results between the energy storage power stations specified in the partition.

Partition control is set by partition control and partition control target. Partition control mode, the way to implement partition centralized control.

In a specific embodiment, the control mode of the partition includes:

The energy storage power station in the "one-key charging" zone is discharged at the maximum discharge power;

The energy storage power station in the "one-key charging" zone is charged with the maximum charging power;

"Normal" is the reset mode of "one-button charging" and "one-button charging". After the mode is switched from "one-button charging" or "one-button charging" to "normal", each energy storage station automatically exits emergency charging and discharging; "normal" ” mode, according to the partition control objectives, the output of each energy storage power station in the partition is automatically allocated and controlled.

The partition control target is the total active power of the energy storage power station accurately controlled by the partition, which is derived from the unbalanced power generation and consumption of the partition, the cross section exceeding the limit or the manual input, so as to realize the precise power control of the energy storage power station in the partition. The uneven amount of power generation and consumption in the sub-region is calculated from the power deviation between the total load and the total power generation in the sub-region; the excess limit of the section is calculated from the deviation between the power flow of the important sending and receiving section and the thermal stability limit of the section that is of concern to the sub-region; the manual input is the amount of dispatching according to the on-site operation. In this case, the input of human decision-making results.

When the partition control mode is "Normal" and the partition control target is not equal to 0, the partition formulates the distribution strategy of the energy storage power stations in the partition according to their respective partition control objectives, partition attributes and the attribute values uploaded by the energy storage power stations in the partition. energy storage power station for power distribution.

Partition attributes include: partition name, control mode, control target, allocation strategy, total output of energy storage power plants in the partition, number of controllable power plants, number of uncontrollable power plants, total output of controllable power plants, total output of uncontrollable power plants, and partition Properties and parameters such as energy storage state of charge (SOC) and installed capacity.

In this embodiment, the power distribution is performed on the energy storage power stations in the partition according to the following steps:

21) Count the active power of the uncontrollable energy storage power station in the statistical zone;

22) Subtract the total power of the uncontrollable energy storage power station in 13) from the partition control target, which is the total adjustment capacity of the controllable energy storage power station in the partition;

23) Rank the controllable energy storage power stations according to the total adjustment capacity of the partition. If the total adjustment capacity is positive, the active power is sorted in descending order; if the total adjustment capacity is negative, the active power is in ascending order. the order of sorting;

24) If the total regulation capacity of the partition is greater than 0 and the active power of the energy storage power station i is less than 0, the control target P _des,i of the energy storage power station is:

Among them, P _reg is the total regulation capacity of the partition; P _gen,i is the active power of the energy storage power station i;

If the total regulation capacity of the partition is less than 0 and the active power of the energy storage power station i is greater than 0, the control objective P _des,i of the energy storage power station is:

25) The regulation capacity _Preg,i that has been called by the energy storage power station i is:

P _reg,i =P _des,i -P _gen,i ,

The total adjustment capacity of the partition minus the adjustment capacity called by the energy storage power station i is used to update the total adjustment capacity of the partition, and its expression is:

_Preg ′= _{Preg − Preg,i} ,

where _Preg ' is the updated total adjustment capacity of the partition.

The updated total adjustment capacity of the partition is taken as the total adjustment capacity of the partition, and returns to 4) iteration until the allocation of the total adjustment capacity of the partition ends or there is no energy storage power station that is opposite to the total adjustment capacity of the partition available for calling;

26) If the total adjustment capacity of the partition still remains, recalculate the control target for all controllable energy storage power stations; the distribution coefficient of each controllable energy storage power station is:

If the total adjustment capacity of the partition is greater than 0,

If the total adjustment capacity of the partition is less than 0,

In the formula, _ki is the distribution coefficient of the energy storage power station; soc _max is the upper limit of the SOC of the energy storage power station; soc _now is the measured value of the SOC of the energy storage power station; soc _min is the lower limit of the SOC of the energy storage power station.

27) Sort the distribution coefficients in descending order. If the total adjustment capacity of the partition is greater than 0, the energy storage power stations are called in order according to the maximum discharge power; call until the call ends.

28) Calculate and update the control objectives of each energy storage power station in a rolling manner according to a fixed period.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several improvements and modifications can be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (8)

1. A control method for large-scale energy storage participation in power grid subareas comprises the following steps of taking the control objective of maintaining the regional control deviation of a control area to meet the control performance assessment requirement, and implementing the conventional automatic power generation control of a provincial power grid, and is characterized by further comprising the following steps:

the energy storage power station uploads a self attribute value to the partition;

the subareas carry out centralized control on the energy storage power stations in the subareas through a preset control mode; the method comprises the following steps that a partition makes a power distribution strategy among energy storage power stations in the partition according to a control target and partition attributes of each partition and attribute values uploaded by the energy storage power stations in the partition;

the method for formulating the distribution strategy among the energy storage power stations in the subareas according to the control targets and the subarea attributes of the subareas and the attribute values uploaded by the energy storage power stations in the subareas comprises the following steps:

1) Counting the active power of the uncontrollable energy storage power stations in the subareas and calculating the sum of the power of the uncontrollable energy storage power stations;

2) Subtracting the sum of the power of the uncontrollable energy storage power station from the zone control target to obtain the total regulating capacity of the controllable energy storage power station in the zone;

3) Sequencing the controllable energy storage power stations according to the total regulation capacity of the subareas, and sequencing the controllable energy storage power stations from small to large according to the active power if the total regulation capacity is positive; if the total regulation capacity is negative, sequencing the active power from high to low;

4) According to the sequencing result, sequentially calling the energy storage power stations with the reverse total partition regulation capacity;

if the total partition regulating capacity is larger than 0 and the active power of the energy storage power station i is smaller than 0, the control target P of the energy storage power station _des,i Comprises the following steps:

wherein P is _reg Adjusting the total capacity for the partition; p is _gen,i The active power of an energy storage power station i is obtained;

if the total adjustment capacity of the subareas is less than 0 and the active power of the energy storage power station i is greater than 0, the control target P of the energy storage power station _des,i Comprises the following steps:

5) Called regulating capacity P of energy storage power station i _reg,i Comprises the following steps:

P _reg,i ＝P _des,i -P _gen,i (3)，

and subtracting the called regulating capacity of the energy storage power station i from the total regulating capacity of the subareas to update the total regulating capacity of the subareas, wherein the expression is as follows:

P _reg ′＝P _reg -P _reg,i (4)，

wherein P is _reg ' Total Capacity for updated partitions;

the updated total partition adjusting capacity is used as the total partition adjusting capacity, and the step 4) of iteration is returned until the distribution of the total partition adjusting capacity is finished or no energy storage power station opposite to the total partition adjusting capacity is available for calling;

6) If the total partition adjusting capacity is still remained, recalculating the control targets of all controllable energy storage power stations; the distribution coefficient of each controllable energy storage power station is as follows:

if the total partition coordination capacity is greater than 0,

if the total adjusted capacity of the partition is less than 0,

in the formula, k _i The distribution coefficient of the energy storage power station; soc _max Is the SOC upper limit of the energy storage power station; soc _now The SOC measured value of the energy storage power station is obtained; soc _min The SOC lower limit of the energy storage power station;

7) Sorting distribution coefficients from large to small, and if the total regulation capacity of the subareas is larger than 0, sequentially calling each energy storage power station according to the maximum discharge power; if the total partition adjusting capacity is larger than 0, the energy storage power stations are sequentially called according to the maximum charging power until the calling is finished;

8) And (4) rolling and calculating and updating the control target of each energy storage power station according to a fixed period.

2. The method for controlling the large-scale energy storage participation power grid in the subareas according to claim 1, wherein the subareas perform centralized control on the energy storage power stations in the subareas through a preset control mode comprises the following steps:

when the subareas are set to be in a discharging mode, the energy storage power stations in the subareas discharge with the maximum discharging power;

when the subareas are set to be in the charging mode, the energy storage power stations in the subareas are charged with the maximum charging power;

when the subareas are set to be in the normal mode, the energy storage power stations in the subareas automatically track the power distribution results among the energy storage power stations set by the subareas.

3. The method for controlling the large-scale energy storage participation power grid partition according to claim 2, wherein the energy storage power station participates in centralized control of the partition in which the energy storage power station is located through a preset working mode, and the preset working mode comprises the following steps: a charge mode, a discharge mode, and a base point mode;

in the charging mode, if the regional regulation requirement is positive and the region is in a secondary emergency region or an emergency region, a power command of 0 is executed; charging at the maximum charging power under the other conditions until the electric quantity is full;

in the discharging mode, if the regional regulation requirement is negative and the regional regulation requirement is in a secondary emergency area or an emergency area, a power command of 0 is executed; discharging with the maximum discharge power under the other conditions until the electric quantity is discharged;

the base point mode automatically tracks a base point power, which is derived from a result of allocation of the partition control target.

4. The method for controlling the large-scale energy storage participation power grid partition according to claim 1, wherein the partition attributes comprise: the method comprises the following steps of partition name, control mode, control target, distribution strategy, total output sum of energy storage power stations in a partition, controllable power station number, uncontrollable power station number, total output sum of controllable power station, total output sum of uncontrollable power station, partition energy storage state of charge and installed capacity.

5. The method for controlling the large-scale energy storage participation power grid partition according to claim 1, wherein the energy storage power station self attribute values comprise: the system comprises SOC measurement, SOC upper and lower limits, maximum charging power, maximum discharging power, maximum charging power time, maximum discharging power time, charging locking, discharging locking, charging completion and discharging completion attributes uploaded by the energy storage power station, and a control area and a partition to which the energy storage power station belongs.

6. The large-scale energy storage participation grid partition control method according to claim 1, wherein the energy storage power station can participate in ACE adjustment of a control area and also can participate in centralized control of a partition where the energy storage power station is located; when the energy storage power station is controlled by the subareas and the control area at the same time, the subarea priority is higher than the control area.

7. The method for controlling the large-scale energy storage participation power grid subareas according to claim 1, wherein the control target of the subareas is derived from the amount of the subarea power generation and utilization unbalance, the cross section excess amount or the manual input amount.

8. A power grid partition control system with participation of large-scale energy storage is characterized by comprising: a control area, a subarea and an energy storage power station;

the control area is used for implementing conventional automatic power generation control of the provincial power grid by taking the control target of maintaining that the area control deviation ACE of the control area meets the control performance assessment requirement;

the energy storage power station uploads the attribute value of the energy storage power station to the partition where the energy storage power station is located;

the subareas are used for making an allocation strategy of the energy storage power stations in the subareas according to the control targets of the subareas, the attributes of the energy storage power stations in the subareas and the attribute values uploaded by the energy storage power stations in the subareas;

the subareas are also used for carrying out centralized control on the energy storage power stations in the subareas through a preset control mode;

the method for making the inter-storage-power-station distribution strategy in the subareas according to the control targets and the subarea attributes of the subareas and the attribute values uploaded by the energy storage power stations in the subareas comprises the following steps:

1) Counting the active power of the uncontrollable energy storage power stations in the subareas and calculating the sum of the power of the uncontrollable energy storage power stations;

2) Subtracting the sum of the power of the uncontrollable energy storage power station from the zone control target to obtain the total regulating capacity of the controllable energy storage power station in the zone;

3) Sequencing the controllable energy storage power stations according to the total regulation capacity of the subareas, and sequencing the controllable energy storage power stations from small to large according to the active power if the total regulation capacity is positive; if the total regulation capacity is negative, sequencing the active power from high to low;

4) According to the sequencing result, sequentially calling the energy storage power stations with the reverse direction of the total regulation capacity of the subareas;

if the total adjustment capacity of the subareas is greater than 0 and the active power of the energy storage power station i is less than 0, the control target P of the energy storage power station _des,i Comprises the following steps:

wherein P is _reg Adjusting the total capacity for the partition; p _gen,i The active power of an energy storage power station i is obtained;

if the total adjustment capacity of the subareas is less than 0 and the active power of the energy storage power station i is greater than 0, the control target P of the energy storage power station _des,i Comprises the following steps:

5) Called regulating capacity P of energy storage power station i _reg,i Comprises the following steps:

P _reg,i ＝P _des,i -P _gen,i (3)，

and subtracting the called regulating capacity of the energy storage power station i from the total regulating capacity of the subareas to update the total regulating capacity of the subareas, wherein the expression is as follows:

P _reg ′＝P _reg -P _reg,i (4)，

wherein P is _reg ' Total Capacity for updated partitions;

the updated total partition adjusting capacity is used as the total partition adjusting capacity, and the step 4) of iteration is returned until the distribution of the total partition adjusting capacity is finished or no energy storage power station opposite to the total partition adjusting capacity is available for calling;

6) If the total partition adjusting capacity is still remained, recalculating the control targets of all controllable energy storage power stations; the distribution coefficient of each controllable energy storage power station is as follows:

if the total partition regulation capacity is greater than 0,

if the total partition adjustment capacity is less than 0,

in the formula, k _i The distribution coefficient of the energy storage power station; soc _max The SOC upper limit of the energy storage power station; soc _now The SOC measured value of the energy storage power station is obtained; soc _min The SOC lower limit of the energy storage power station;

7) Sorting distribution coefficients from large to small, and if the total regulation capacity of the subareas is greater than 0, calling the energy storage power stations in sequence according to the maximum discharge power; if the total partition adjusting capacity is larger than 0, the energy storage power stations are sequentially called according to the maximum charging power until the calling is finished;

8) And rolling and calculating and updating the control targets of the energy storage power stations according to a fixed period.

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