CN110021930B - Large-scale energy storage participation power grid partition control method and system - Google Patents
Large-scale energy storage participation power grid partition control method and system Download PDFInfo
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- H—ELECTRICITY
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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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
Technical Field
The invention belongs to the field of power system control, and particularly relates to a large-scale energy storage participation power grid partition control method and system.
Background
The provincial power grid 220kV subarea division operation and related network analysis optimization are basic measures for limiting short-circuit current, each provincial power grid company takes a 500kV net rack as a main network at present to undertake power transmission among subareas, and a 220kV power supply circuit in each subarea forms an independent network structure of a radial or local ring network. The subarea power grids are relatively independent in a normal mode, can support each other, and meet the requirements of a 500kV main transformer and 220kV line steady state N-1 and N-2.
With the implementation of policy and policies such as industrial structure adjustment, energy conservation and emission reduction, the power grid gradually eliminates the backward capacity and shuts down the old thermal power generating unit, the characteristics of mature electrochemical energy storage technology and short construction period become the primary choice of the power grid alternative power supply, and part of provincial power grids are built through large-scale energy storage power stations and used for making up the situation of power supply situation shortage after thermal power retirement. The power output characteristic of the stored energy is obviously different from that of a conventional power supply, and the energy storage device has the capability of quick charge-discharge conversion and instruction tracking. For an energy storage power station which is accessed to a 10kV power distribution network in a large scale, the method has great significance for solving the problems of subarea power generation and utilization balance and section safety through provincial and dispatching centralized control, peak clipping and valley filling and electric energy dispatching.
The literature, "research on automatic power generation control strategies with energy storage resource participation" (34, 29, 5080, vol. 2014 in the Chinese electro-mechanical engineering newspaper), discloses two control strategies with energy storage resource participation in AGC, wherein one control strategy is to determine a dynamic distribution proportion coefficient of energy storage according to the regional regulation demand (ARR) of a power grid, and the energy storage bears a large regulation proportion when the ARR is in an emergency zone; the other method is to divide the frequency modulation requirement into a high-frequency part and a low-frequency part which are respectively borne by energy storage resources and a traditional unit so as to fully exert the advantages of each frequency modulation resource and improve the frequency modulation control effect.
Two control strategies Of energy storage resource participation AGC provided by the document are mainly used for solving the distribution strategy Of energy storage and a conventional power supply in participation Of regional control deviation (ACE) adjustment in real-time operation Of a power grid, the strategy is used for enabling the energy storage to be equivalent to a conventional unit in modeling, the constraint condition Of the energy storage residual electric quantity or the State Of Charge (SOC) is not considered, the adjusting power between the energy storage power stations is distributed according to the adjustable capacity, and the influence Of the adjusting power on the SOC Of the energy storage power stations is not considered.
The document two, "research on constant-power peak clipping and valley filling optimization strategies for battery energy storage systems" (36 th volume, 9 th page 232 of power grid technology) discloses a constant-power peak clipping and valley filling optimization model and a solving algorithm for a battery energy storage system, which can quickly solve the charging and discharging strategies for the battery energy storage system under the conditions that the battery is charged 1 time a day and discharged for multiple times, and can quickly perform day-ahead optimization. On the basis of constant-power charging and discharging, the charging and discharging of the battery can be flexibly controlled by changing the model parameters in a real-time control stage, and the functions of peak clipping and valley filling are realized.
In the peak shaving real-time control strategy described in the document two, the charging and discharging start time is determined by a real-time load threshold value in a real-time control stage; the charge and discharge power is calculated by dividing the charge and discharge energy optimized in the day ahead by the charge and discharge time. Because the proportion of the stored energy to the system load is smaller than that of the stored energy, the strategy still assists in participating in the peak load regulation of the power grid by a 'charging and discharging' strategy.
Disclosure of Invention
The invention aims to solve the technical problems in at least one aspect, provides a method and a system for controlling the large-scale energy storage participation of a power grid in a partitioned mode on the basis of provincial dispatching centralized control, establishes the corresponding relation between an energy storage power station and a partition, and gives consideration to the control targets of the power grid control area and the partition.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
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 method comprises the following steps that the partitions carry out centralized control on energy storage power stations in the partitions through a preset control mode;
and the subareas make power distribution strategies 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.
In the above technical solution, further, the centralized control of the energy storage power station in the partition by the preset control mode includes:
when the subareas are set to be in the 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.
Further, the energy storage power station participates in the centralized control of the partition through a preset working mode, wherein the preset 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 pattern automatically tracks a base point power derived from the allocation result of the partition control target.
Preferably, the partition attribute includes: 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.
Preferably, the energy storage power station property values include: 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.
Further, according to the control target, the partition attribute and the attribute value uploaded by the energy storage power station of each partition, the method for formulating the inter-energy storage power station distribution strategy in the partition 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 serve as 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;
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 the energy storage power station i is obtained;
if the total regulation capacity of the subareas is less than 0 and the active power of the energy storage power station i is largeAt 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 regulation capacity of the energy storage power station i from the total partition regulation capacity to update the total partition regulation capacity, wherein the expression is as follows:
P reg ′＝P reg -P reg,i (4)，
wherein P is reg ' Total Capacity is adjusted for the updated partition.
The updated total partition regulating capacity is used as the total partition regulating capacity, and the step 4) of iteration is returned until the distribution of the total partition regulating capacity is finished or no energy storage power station opposite to the total partition regulating 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 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 lower limit of SOC 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 (4) rolling and calculating and updating the control target of each energy storage power station according to a fixed period.
Preferably, when the energy storage power station is controlled by the subarea and the control area at the same time, the subarea is higher in priority than the control area.
In another aspect, the present invention provides a system for participating in grid partition control of large-scale energy storage, including: 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;
and 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 invention has the following beneficial effects:
1. aiming at power grid subareas accessed by a large-scale energy storage power station, the invention realizes the centralized control of the energy storage power station through the subareas according to the corresponding relation between the energy storage power station and the subareas, and meets the safety requirements of the sections under the conditions of power utilization balance and emergency of the subareas;
2. the control mode of the subarea provided by the invention can meet the requirements of quick power adjustment and accurate control;
3. the energy storage power station participates in a zone control working mode, so that zone control is participated in and quitted in a determined mode, and target output is updated in a rolling mode;
4. the partition sets up the distribution strategy of the energy storage power stations in the partition according to the respective partition control target and partition attributes, calculates the distribution capacity of each energy storage power station according to the output conditions, charging and discharging state conversion, output adjustment and state of charge (SOC) rolling of the controllable and uncontrollable energy storage power stations in the partition, and enables the control method to be more reasonable and reliable.
Drawings
FIG. 1: a dead zone, normal zone, sub-emergency zone and emergency zone schematic diagram of the zone regulation requirements;
FIG. 2: the invention discloses a flow chart for power distribution among energy storage stations.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example (b): a method for controlling large-scale energy storage participation in power grid partition includes:
the control method comprises the steps of taking the condition that the regional control deviation of a control area meets the control performance assessment requirement as a control target, and implementing the conventional automatic power generation control of the provincial power grid;
the energy storage power station uploads a self attribute value to the partition;
the method comprises the following steps that the partitions carry out centralized control on energy storage power stations in the partitions through a preset control mode; and the subareas make power distribution strategies 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.
In the prior art, a local power grid usually adopts a provincial dispatching and hierarchical management mode, and the basic principle of Automatic Generation Control (AGC) in an interconnected system is to execute an inter-regional exchange power plan on the premise of ensuring the frequency quality of the system. And the system is divided into different control areas according to the electric boundaries of the branch regulation and each provincial regulation and the power supply. A direct regulating unit and a provincial regulating unit are divided according to the attribution of the regulating authority of a generator set (power supply) in a power grid, and are directly regulated and controlled by a control area to which the direct regulating unit belongs.
The Control objective of the provincial level power grid Control Area is to maintain the Area Control deviation (ACE) of the Control Area to meet the Control Performance assessment requirement, and the main assessment standards comprise an A (criterion A1/A2) Standard and a CPS (Control Performance Standard) Standard. And the provincial power grid control Area calculates the ACE and the Area Regulation Requirement (ARR) of the control Area through frequency, planned exchange power and actual exchange power, and distributes the ARR to each unit.
After the 220kV subarea operation of the provincial power grid, each subarea should ensure the safety of the electricity generation and utilization balance and the key power transmission section in the subarea so as to avoid the power transmission fault caused by 500kV main transformer overload in the load peak period and 200kV power transmission line tide overrun in the subarea. The conventional automatic power generation control of the conventional provincial power grid adopts the prior art, and details are not described here.
In a specific embodiment, the attributes of the energy storage power station include, in addition to the attributes and parameters of the conventional unit, such as installed capacity, adjustment range, maximum command, adjustment rate, command dead zone, remote controllable signal, the attributes of SOC measurement, SOC upper and lower limits, maximum charging power, maximum discharging power, maximum charging power use time, maximum discharging power use time, charging lockout, discharging lockout, charging completion, discharging completion and the like, which are sent by the energy storage power station, and the control area and the partition area to which the artificially defined energy storage power station belongs.
The energy storage power station participates in the partition control of the preset working modes through the preset working modes, wherein the preset working modes comprise a charging mode, a discharging mode and a base point mode. The control mode of the energy storage power station can be automatically switched according to the zone control mode and the control target.
The charging mode is as follows: if the area regulation requirement is positive and the area is in a secondary emergency area or an emergency area, executing a power command of 0; charging at the maximum charging power under the other conditions until the electric quantity is full;
the discharge mode is as follows: charging according to the maximum discharge power until the electric quantity is discharged, and avoiding the active balance condition of the discharge behavior deterioration region as much as possible under the emergency condition; if the area regulation requirement is negative and the area is in a secondary emergency area or an emergency area, executing a power command of 0; discharging at the maximum discharge power under the other conditions;
the base point pattern is: the base point power is automatically tracked, and the base point power is derived from the distribution result of the partition control target.
Typically, the AGC divides ACE into dead band, normal regulation, sub-emergency regulation and emergency regulation according to the size of the regional regulation demand ARR and a given static threshold, as shown in fig. 1.
In the specific embodiment, if the control mode of the subarea is 'one-key charging', the control mode of each energy storage power station in the subarea is automatically converted into a 'charging mode'; if the partition control mode is 'one-key discharge', the control mode of each energy storage power station in the partition is automatically converted into a 'discharge mode'; and if the control mode of the subarea is normal and the control target is not equal to 0, the control mode of each energy storage power station in the subarea is automatically converted into a base point mode, and the base point power is used for formulating a power distribution strategy among the energy storage power stations in the subarea according to the control target and the subarea attribute of each subarea and the attribute value uploaded by the energy storage power stations in the subarea to obtain a distribution result.
If the working condition of the energy storage power station is abnormal, the energy storage power station can be manually quitted from the zone control and is converted into other control modes. When the energy storage power station defines the attributes of the control area and the subareas at the same time, the energy storage power station can participate in ACE adjustment of the control area and centralized control of the subareas, and when the subareas and the control area control the energy storage power station at the same time, the priority of the subareas is higher than that of the control area. When the partition has no control demand, the partition can participate in the regulation task of the control area.
The large-scale energy storage power station is connected to a medium-low voltage distribution network and belongs to a certain power grid partition in a provincial power grid, and the centralized control of the remote controllable energy storage power station in the partition is realized by the partition;
in the specific embodiment, the step of performing 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.
The control of the partition is set by the partition control and the partition control target. And a partition control mode, which is a mode of implementing partition centralized control.
In a specific embodiment, the control modes of the partitions include:
the energy storage power station in the one-key charging subarea discharges with the maximum discharge power;
the energy storage power stations in the one-key charging subarea are charged with the maximum charging power;
the normal mode is a one-key charging mode and a one-key charging mode, and after the mode is switched from the one-key charging mode or the one-key charging mode to the normal mode, each energy storage power station automatically quits the emergency charging and discharging mode; and in the normal mode, the output of each energy storage power station in the subarea is automatically distributed and controlled according to the subarea control target.
And the target of zone control is the total active power of the energy storage power station accurately controlled by zones, and the total active power is derived from the unbalance amount of electricity generated and used by the zones, the cross section limit increasing amount or manual input amount, so that the accurate power control of the energy storage power station in the zones is realized. The uneven quantity of the power for the subarea power generation is obtained by calculating the power deviation between the total load and the total power generation in the subarea; the cross section more limit is obtained by calculating the deviation between the section flow and the section thermal stability limit which are important to be sent and received and pay attention to in a subarea; the manual input quantity is a manual decision result input by the dispatching according to the field operation working condition.
When the partition control mode is normal and the partition control target is not equal to 0, the partitions formulate distribution strategies of the energy storage power stations in the partitions according to the respective partition control targets, partition attributes and attribute values uploaded by the energy storage power stations in the partitions so as to distribute power to the energy storage power stations in the partitions.
The partition attributes include: 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 (SOC), installed capacity and other attributes and parameters.
In this embodiment, power distribution is performed on the energy storage power stations in the subareas according to the following steps:
21 Active power of an uncontrollable energy storage power station in a subarea is counted;
22 Subtracting the total sum of the power of the uncontrollable energy storage power station in the step 13) from the control target of the subarea to obtain the total adjustment capacity of the controllable energy storage power station in the subarea;
23 Sorting the controllable energy storage power stations according to the total regulation capacity of the subareas, and if the total regulation capacity is positive, sorting the controllable energy storage power stations according to the sequence of active power from small to large; if the total regulation capacity is negative, sequencing the active power from high to low;
24 If the total regulation capacity of the subareas is more 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:
25 Called regulating capacity P of energy storage station i reg,i Comprises the following steps:
P reg,i ＝P des,i -P gen,i ，
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 ，
wherein P is reg ' Total Capacity is adjusted for the updated partition.
The updated total partition regulating capacity is used as the total partition regulating capacity, and the step 4) of iteration is returned until the distribution of the total partition regulating capacity is finished or no energy storage power station opposite to the total partition regulating capacity is available for calling;
26 If the total regulation capacity of the subareas still remains, 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 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 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.
27 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; and if the total partition regulating capacity is larger than 0, sequentially calling the energy storage power stations according to the maximum charging power until the calling is finished.
28 The control targets of the energy storage power stations are calculated and updated according to a fixed period rolling calculation.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations 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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