CN116454945B - Fire-storage hybrid power station cooperative operation method and device based on battery energy storage system - Google Patents

Fire-storage hybrid power station cooperative operation method and device based on battery energy storage system Download PDF

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CN116454945B
CN116454945B CN202310397173.0A CN202310397173A CN116454945B CN 116454945 B CN116454945 B CN 116454945B CN 202310397173 A CN202310397173 A CN 202310397173A CN 116454945 B CN116454945 B CN 116454945B
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bess
agc
thermal power
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power generating
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CN116454945A (en
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薛晓岑
陈沛
高希
张新松
马子云
顾北萍
朱晨旭
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Nantong University
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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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel generators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention provides a method, a device, equipment and a storage medium for collaborative operation of a fire-storage hybrid power station based on a battery energy storage system, wherein the method comprises the following steps: dividing a Battery Energy Storage System (BESS) into two parts of BESS with equal capacity, and respectively connecting the two parts of BESS to a thermal power unit system; wherein, the two BESS parts are always in different charge and discharge states; and determining a demand dispatching direction based on an AGC instruction issued by a dispatching center, and selecting BESS with the current charge and discharge state matched with the demand dispatching direction from the two BESS to assist the thermal power generating unit system to perform AGC instruction response. The control strategy fully considers the cooperative operation between the thermal power unit and the BESS, and can fully exert the BESS frequency modulation advantage, thereby effectively improving the secondary frequency modulation performance of the fire-storage hybrid power station based on the battery energy storage system.

Description

Fire-storage hybrid power station cooperative operation method and device based on battery energy storage system
Technical Field
The invention relates to the technical field of secondary frequency modulation of thermal power plants, in particular to a method, a device, equipment and a storage medium for collaborative operation of a fire-storage hybrid power station based on a battery energy storage system.
Background
With the gradual exhaustion of fossil fuels and the increasing increase of environmental pollution, the development of new energy sources represented by wind and light is a common knowledge in all countries of the world. Under the background of large-scale grid connection of new energy sources such as wind and light, the electric power system presents novel characteristics such as high new energy source permeability, high power electronization, and the like, and the weak inertia and random fluctuation of the electric power system obviously increase the frequency modulation pressure of the traditional thermal power generating unit, so that the safety of the power grid is greatly threatened. The rapid development of the battery energy storage technology provides a new technology choice for assisting the thermal power generating unit to participate in secondary frequency modulation by utilizing the BESS (Battery energy storage systems, battery energy storage system) and relieving the frequency modulation pressure of the power grid.
Aiming at the problem that BESS participates in secondary frequency modulation, the scheme recorded in the prior literature does not consider the cooperative operation between a thermal power unit and the BESS, can not fully exert the advantage of BESS frequency modulation, has certain limitations, and therefore, a scheme capable of improving the secondary frequency modulation performance of a fire-storage hybrid power station based on a battery energy storage system is needed to be provided.
Disclosure of Invention
The invention aims to provide a method, a device, equipment and a storage medium for collaborative operation of a fire-storage hybrid power station based on a battery energy storage system, so as to solve the technical problems, and further improve the secondary frequency modulation performance of the fire-storage hybrid power station based on the battery energy storage system.
In order to solve the technical problems, the invention provides a fire-storage hybrid power station cooperative operation method based on a battery energy storage system, which comprises the following steps:
dividing a battery energy storage system into two parts of BESS, and respectively connecting the two parts of BESS to a thermal power unit system; wherein, the two BESS parts are always in different charge and discharge states;
and determining a demand dispatching direction based on an AGC instruction issued by a dispatching center, and selecting BESS with the current charge and discharge state matched with the demand dispatching direction from the two BESS to assist the thermal power generating unit system to perform AGC instruction response.
Further, the determining a demand dispatching direction based on the AGC instruction issued by the dispatching center selects a BESS with a current charge and discharge state matched with the demand dispatching direction from the two BESS, and assists the thermal power generating unit system to perform AGC instruction response, including:
if the AGC command issued by the dispatching center is judged to be an ascending command, determining the current demand dispatching direction as the unit output increasing direction, and selecting the BESS in a discharging state to assist the thermal power unit system to carry out AGC command response;
if the AGC command issued by the dispatching center is judged to be a descending command, the current demand dispatching direction is determined to be the unit output force reduction, and the BESS in the charging state is selected to assist the thermal power unit system to carry out AGC command response.
Further, the method for collaborative operation of the fire-storage hybrid power station based on the battery energy storage system further comprises the following steps:
if the AGC command issued by the dispatching center is judged to be an ascending command, the maximum capacity of the frequency modulator is controlled to increase the output of the thermal power unit;
if the AGC command issued by the dispatching center is judged to be a lowering command, the maximum capacity of the frequency modulator is controlled to reduce the output of the thermal power unit.
Further, the battery energy storage system is divided into two parts of BESS, specifically:
the battery energy storage system is divided into two parts of BESS with equal capacity.
Further, the method for collaborative operation of the fire-storage hybrid power station based on the battery energy storage system further comprises the following steps:
and if any part of the BESs is monitored to be fully charged or fully discharged, switching the charging and discharging states of the part of the BESs.
Further, if it is detected that any part of the bes is fully charged or fully discharged, the charging and discharging states of the part of the bes are switched, specifically:
if any part of BESS is monitored to be fully charged or fully discharged, the charging and discharging states of the part of BESS are switched, and the charging and discharging states of the other part of BESS are synchronously switched.
Further, the determining a demand dispatching direction based on the AGC instruction issued by the dispatching center selects a BESS with a current charge and discharge state matched with the demand dispatching direction from the two BESS, and assists the thermal power generating unit system to perform AGC instruction response, which specifically includes:
the first part BESS and the second part BESS are respectively in a discharging state and a charging state at the issuing time of the AGC command i;
after receiving the AGC ascending instruction, the thermal power generating unit immediately climbs up at the maximum climbing speed v up Increasing the power generation output, responding to the AGC rising instruction, and according to the response effectThe following three cases can be distinguished:
the first condition indicates that the thermal power generating unit can track the target output of the upper AGC command i in the duration of the AGC command i, and the power generating output P g,t Expressed as:
wherein P is g,t Generating power for the thermal power generating unit at the time t; i is an AGC instruction index; t (T) s,i Starting time of AGC command i; t (T) 1,i Tracking the moment of the output of the upper AGC command target in the duration of the AGC command period i for the thermal power generating unit; t (T) s,i+1 The issuing time of the next AGC command is given; p0 g, i is the generated output of the thermal power unit at the time of issuing the AGC command i; p (P) AGC,i Target output for AGC instruction i;
the second condition indicates that the thermal power generating unit cannot track the up AGC command in the duration of the AGC command i, but can track the target output of the up AGC command i before the next AGC command is issued, and the power generating unit generates the output P g,t Expressed as:
wherein T is 2,i Tracking the moment of the target output of the upper AGC command i before the next AGC command is issued for the thermal power generating unit;
the third condition indicates that the thermal power generating unit still cannot track the target output of the upper AGC command i when the next AGC command is issued, and the power generating output P of the thermal power generating unit g,t Expressed as:
for the AGC ascending instruction, on the basis of response of the thermal power generating unit, the second part BESS in a charging state stands by, and the first part BESS in a discharging state is controlled to assist the thermal power generating unit to participate in secondary frequency modulation, and the discharging power is expressed as:
in the formula, PI b, t is the discharge power of the first part BESS before the next AGC instruction is issued; PI dmax, t is the maximum discharge power that the first portion BESS can provide at time t, expressed as:
wherein P is dis Rated discharge power per unit capacity BESS; e (E) c The BESS total capacity of the thermal power plant is accessed; η (eta) d Is the discharge efficiency; delta T is the cooperative control period length; s is S min The minimum allowable value of the BESS charge state is set; s is S Ⅰ,t The state of charge at time t for the first portion BESS is expressed as:
wherein S is Ⅰ,t-1 The state of charge at time t-1 for the first portion BESS; PI b, t-1 is the discharge power of the first portion BESS at time t-1;
after receiving the AGC lowering instruction, the thermal power generating unit immediately climbs down at the maximum climbing speed v down The power generation output is reduced, the AGC lowering instruction is responded, and according to the response effect, the three conditions are divided as follows:
the first condition indicates that the thermal power generating unit can track the target output of the upper AGC command i in the duration of the AGC command i, and the power generating output P g,t Expressed as:
the second case indicates that the thermal power generating unit cannot track the AGC up command in the duration of the AGC command i, butThe target output of the upper AGC command i can be tracked before the next AGC command is issued, and the target output generates the output P g,t Expressed as:
the third condition indicates that the thermal power generating unit still cannot track the target output of the upper AGC command i when the next AGC command is issued, and the power generating output P of the thermal power generating unit g,t Expressed as:
for the AGC lowering instruction, on the basis of response of the thermal power generating unit, the first part BESS in a discharging state stands by, and the second part BESS in a charging state is controlled to charge to assist the thermal power generating unit to respond to the AGC instruction, which is expressed as:
wherein PII b, t is the charging power of the second part BESS before the next AGC instruction is issued; PII cmax, t is the maximum charge power that the second portion BESS can provide at time t, expressed as:
wherein P is ch Rated charge power for a unit capacity BESS; η (eta) c Is the charging efficiency; s is S max Is the maximum allowable value of the charge state; s is S ⅠI,t For the state of charge of the second portion BESS at time t, it is calculated by:
wherein S is ⅠI,t-1 Is the second partThe charge state of the sub BESS at the time t-1; PII b, t-1 is the charging power of the second portion BESS at time t-1.
The invention also provides a fire-storage hybrid power station cooperative operation device based on the battery energy storage system, which comprises:
the system dividing module is used for dividing the battery energy storage system into two parts of BESS and respectively connecting the two parts of BESS to the thermal power unit system; wherein, the two BESS parts are always in different charge and discharge states;
and the response frequency modulation module is used for determining a demand dispatching direction based on an AGC instruction issued by a dispatching center, selecting BESS with the current charge and discharge state matched with the demand dispatching direction from the two BESS, and assisting the thermal power generating unit system to respond to the AGC instruction.
The invention also provides a terminal device, which comprises a processor and a memory storing a computer program, wherein the processor realizes the fire-storage hybrid power station cooperative operation method based on the battery energy storage system when executing the computer program.
The invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the fire-storage hybrid power station co-operation method based on the battery energy storage system of any one of the above.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method, a device, equipment and a storage medium for collaborative operation of a fire-storage hybrid power station based on a battery energy storage system, wherein the method comprises the following steps: dividing a battery energy storage system into two parts of BESS, and respectively connecting the two parts of BESS to a thermal power unit system; wherein, the two BESS parts are always in different charge and discharge states; and determining a demand dispatching direction based on an AGC instruction issued by a dispatching center, and selecting BESS with the current charge and discharge state matched with the demand dispatching direction from the two BESS to assist the thermal power generating unit system to perform AGC instruction response. The control strategy fully considers the cooperative operation between the thermal power unit and the BESS, and can fully exert the BESS frequency modulation advantage, thereby effectively improving the secondary frequency modulation performance of the fire-storage hybrid power station based on the battery energy storage system.
Drawings
FIG. 1 is a schematic flow chart of a method for collaborative operation of a fire-storage hybrid power station based on a battery energy storage system provided by the invention;
FIG. 2 is a schematic diagram of a fire-storage hybrid power station topology provided by the present invention;
fig. 3 is a schematic diagram of a charge-discharge state switching strategy of the battery energy storage system provided by the invention;
FIG. 4 is a schematic diagram of three situations of a thermal power generating unit responding to an AGC up command;
FIG. 5 is a schematic diagram of three situations of a thermal power generating unit responding to an AGC lowering command;
fig. 6 is a schematic diagram of an AGC instruction issued within 5 minutes of a dispatch center provided by the present invention;
FIG. 7 is a schematic diagram of the generated output of the thermal power generating unit in response to an AGC command;
FIG. 8 is a schematic diagram of charge and discharge power of BESS for assisting secondary frequency modulation of a thermal power unit;
FIG. 9 is a schematic diagram of the output of the fire-storage hybrid power station provided by the present invention;
fig. 10 is a schematic structural diagram of a fire-storage hybrid power station cooperative operation device based on a battery energy storage system.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, an embodiment of the present invention provides a method for collaborative operation of a fire-storage hybrid power station based on a battery energy storage system, which may include the steps of:
s1, dividing a battery energy storage system into two parts of BESS, and respectively connecting the two parts of BESS to a thermal power unit system; wherein, the two BESS parts are always in different charge and discharge states;
s2, determining a demand dispatching direction based on an AGC instruction issued by a dispatching center, selecting BESS with the current charge and discharge state matched with the demand dispatching direction from the two BESS, and assisting the thermal power generating unit system to respond to the AGC instruction.
It should be noted that, aiming at the problem that the BESS participates in secondary frequency modulation, a BESS control strategy based on fuzzy control is provided in literature, namely a battery energy storage system auxiliary AGC frequency modulation method based on fuzzy control (protection and control of electric power system, 2015, 43 rd, 8 th and 81-87 th), which can remarkably reduce frequency deviation and tie-line exchange power deviation. The second literature (protection and control of electric power system, 2019, volume 47, 22, 89-97) also provides a control strategy for assisting secondary frequency modulation of a thermal power unit based on fuzzy control and BESS (battery operated control system) and recovering the BESS charge state by using the residual frequency modulation capacity of the thermal power unit when the frequency deviation is smaller. The third literature (report of China Motor engineering, volume 41, 10, 3383-3391+3664) provides a BESS time-interval control strategy considering the checking performance, and the secondary frequency modulation of the thermal power generating unit is assisted by reasonably controlling the BESS charging and discharging power and the action time, so that the frequency modulation income is improved. However, these methods do not fully consider the cooperative operation between the thermal power generating unit and the BESS, and have certain limitations.
Aiming at the defects existing in the prior art, the embodiment of the invention provides a secondary frequency modulation cooperative operation strategy of a fire-storage hybrid power station based on a battery energy storage system (Battery energy storage systems, BESS). The BESS is divided into two parts with equal capacity and connected into a thermal power plant (called BESS I and BESS II), the two parts are always in different charge and discharge states in operation, and the thermal power unit is assisted to respond to an automatic power generation control (Automatic generation control, AGC) instruction issued by a dispatching center through the cooperative operation between the thermal power unit and the BESS, so that the secondary frequency modulation performance is obviously improved.
The embodiment of the invention can be realized by the following steps:
1. the battery energy storage system (Battery energy storage systems, BESS) is divided into two parts with equal capacity and connected into a thermal power plant (called BESS I and BESS II), the two parts are always in different charge and discharge states, an automatic power generation control (Automatic generation control, AGC) instruction of the thermal power unit is assisted to respond to different adjustment directions, if a dispatching center requires the thermal power unit to increase the power generation output, the AGC instruction is an ascending instruction, otherwise, the corresponding AGC instruction is a descending instruction. As shown in fig. 2.
2. When the dispatching center issues an AGC (automatic gain control) ascending instruction, the output of the thermal power unit is increased by controlling the frequency modulator, the maximum capacity responds to the AGC ascending instruction, and meanwhile, the BESS in a discharging state discharges to assist the thermal power unit to respond to the AGC ascending instruction; when the dispatching center issues the AGC lowering command, the output of the thermal power generating unit is reduced by controlling the frequency modulator, the maximum capacity responds to the AGC lowering command, and meanwhile, the BESS charging in the charging state assists the thermal power generating unit to respond to the AGC lowering command. In operation, once any part of BESS is fully charged or fully discharged, the charging and discharging states of the BESS should be switched immediately, in addition, in order to ensure that the two parts of BESS are always in different charging and discharging states, AGC instructions of the thermal power generating unit in response to different adjusting directions can be assisted at any time, and the charging and discharging states of the other part of BESS should be switched synchronously, and the specific view is shown in figure 3. For convenience of description, assume that bessi and bessi are in a discharge state and a charge state, respectively, at the time of issuing AGC instruction i.
After receiving the AGC ascending instruction, the thermal power generating unit immediately climbs up at the maximum climbing speed v up The increase of the generated power, the response of the AGC boost command, and the response effect can be divided into three cases as shown in fig. 4, as shown in formulas (1) to (3), respectively:
equation (1) shows that the thermal power generating unit can track the target output of the upper AGC command i within the duration of the AGC command i, and generates the output P g,t The specific formula is as follows:
in formula (1): p (P) g,t Generating power for the thermal power generating unit at the time t; i is an AGC instruction index; t (T) s,i Starting time of AGC command i; t (T) 1,i Tracking the moment of the output of the upper AGC command target in the duration of the AGC command period i for the thermal power generating unit; t (T) s,i+1 The issuing time of the next AGC command (namely AGC command i+1); p0 g, i is the generated output of the thermal power unit at the time of issuing the AGC command i; p (P) AGC,i The target force for AGC command i.
Equation (2) indicates that the thermal power generating unit cannot track the upper AGC up command within the duration of the AGC command i, but can track the target output of the upper AGC command i before the next AGC command (i.e. AGC command i+1) is issued, which generates the output force P g,t The specific formula is as follows:
in formula (2): t (T) 2,i The method is used for tracking the moment of the target output of the upper AGC command i before the next AGC command (namely AGC command i+1) is issued for the thermal power generating unit.
Equation (3) shows that the thermal power generating unit still cannot track the target output of the upper AGC command i when the next AGC command (namely AGC command i+1) is issued, and generates the output P g,t The specific formula is as follows:
as can be seen from formulas (1) to (3): under the three conditions, the target output of the AGC ascending instruction cannot be tracked instantaneously only by the thermal power generating unit, so that the BESS discharge is needed to assist the thermal power generating unit to respond to the AGC instruction. Therefore, the BESS II in a charging state stands by, and the BESS I in a discharging state discharges to assist the thermal power unit to participate in secondary frequency modulation, wherein the discharging power is shown as formula (4):
in the formula (4), PI b, t is the discharge power of the bessi before the next AGC instruction (i.e., AGC instruction i+1) is issued; PI dmax, t is the maximum discharge power that bessi can provide at time t, as shown in equation (5):
in the formula (5), P dis Rated discharge power per unit capacity BESS; e (E) c The BESS total capacity of the thermal power plant is accessed; η (eta) d Is the discharge efficiency; delta T is the cooperative control period length; s is S min The minimum allowable value of the BESS charge state is set; s is S Ⅰ,t The state of charge of BESS I at time t is shown in equation (6):
in the formula (6), S Ⅰ,t-1 The state of charge of the battery BESS I at time t-1; PI b, t-1 is the discharge power of BESS I at time t-1.
After receiving the AGC lowering instruction, the thermal power generating unit immediately climbs down at the maximum climbing speed v down The reduction of the generated power, the response to the AGC down command, and the response effect can be divided into three cases as shown in fig. 5, as shown in formulas (7) to (9), respectively:
equation (7) shows that the thermal power generating unit can track the target output of the upper AGC command i within the duration of the AGC command i, and generates the output P g,t The specific formula is as follows:
equation (8) shows that the thermal power generating unit cannot track the upper AGC up command within the duration of the AGC command i, but can track the target output of the upper AGC command i before the next AGC command (i.e. AGC command i+1) is issued, which generates the output force P g,t The specific formula is as follows:
equation (9) shows that the thermal power generating unit still cannot track the target output of the upper AGC command i when the next AGC command (namely AGC command i+1) is issued, and generates the output P g,t The specific formula is as follows:
from formulas (7) to (9), it can be seen that: under the three conditions, the target output of the AGC lowering command cannot be tracked instantaneously only by the thermal power generating unit, so that BESS charging is needed to assist the thermal power generating unit to respond to the AGC command. Therefore, at this time, the BESS i in the discharging state stands by, and the BESS ii in the charging state charges the auxiliary thermal power unit in response to the AGC instruction, specifically as shown in the following formula:
in the formula (10), PII b, t is the charging power of the bessii before the next AGC instruction (i.e. AGC instruction i+1) issues; PII cmax, t is the maximum charging power that BESS II can provide at time t, and is specifically shown in the following formula:
in the formula (11), P ch Rated charge power for a unit capacity BESS; η (eta) c Is the charging efficiency; s is S max Is the maximum allowable value of the charge state; s is S ⅠI,t For the state of charge of BESS II at time t, it can be calculated by:
in the formula (12), S ⅠI,t-1 The state of charge of BESS II at time t-1; PII b, t-1 is the charging power of BESS II at time t-1.
The technical scheme provided by the embodiment of the invention is described in detail below in combination with practical application scenes, a certain thermal power plant bears a secondary frequency modulation task in a system, the rated capacity of a unit is 480MW, and the maximum ascending and descending climbing rates are 15MW/min. In order to improve the secondary frequency modulation performance, the BESS of 40MW h is connected into the thermal power plant according to the scheme shown in the figure 2, namely, the capacities of BESS I and BESS II are 20MW h. The technical parameters of BESS per unit capacity (i.e., 1 MW.h) are shown in Table 1.
TABLE 1 BESS technical parameters (1 MW h)
As shown in fig. 6, 5 AGC instructions are issued within 5 minutes from the dispatch center, that is, an AGC instruction is issued at the 0s, 49s, 156s, 196s and 255s respectively, and the instruction properties and the target output are respectively: a command to decrease the target output of 238MW, a command to increase the target output of 248MW, a command to increase the target output of 256MW, a command to increase the target output of 261MW, and a command to decrease the target output of 254 MW.
After receiving the AGC command issued by the dispatching center, the thermal power generating unit immediately adjusts the power generation output through the configured frequency modulator, and tracks the AGC command as far as possible, wherein the power generation output is shown in figure 7. As can be seen from fig. 7: the AGC command issued by the dispatching center cannot be tracked only by the thermal power unit due to the climbing rate and the output range. In order to improve the secondary frequency modulation performance of the thermal power unit, two groups of BESS connected to the thermal power plant are operated in cooperation with the thermal power unit, and the thermal power unit is assisted to respond to AGC instructions in different directions. The charge and discharge power of the two BESS groups and the output of the fire-storage hybrid power station are shown in the accompanying figures 8 and 9 respectively. As can be seen from fig. 8: when the dispatching center issues 5 AGC commands shown in fig. 6, BESS I and BESS II are in discharging and charging states, and the power generating unit is respectively assisted to respond to the AGC up command and the AGC down command. As can be seen from fig. 9: through the cooperative operation of the thermal power generating unit and the BESS, the fire-storage hybrid power station can completely respond to the AGC instruction shown in the figure 6, and the two-frequency modulation performance is obviously enhanced.
It should be noted that, for simplicity of description, the above method or flow embodiments are all described as a series of combinations of acts, but it should be understood by those skilled in the art that the embodiments of the present invention are not limited by the order of acts described, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are all alternative embodiments and that the actions involved are not necessarily required for the embodiments of the present invention.
Referring to fig. 10, the embodiment of the invention further provides a fire-storage hybrid power station cooperative operation device based on a battery energy storage system, which includes:
the system dividing module 1 is used for dividing the battery energy storage system into two parts of BESS and respectively connecting the two parts of BESS to the thermal power unit system; wherein, the two BESS parts are always in different charge and discharge states;
and the response frequency modulation module 2 is used for determining a demand dispatching direction based on an AGC instruction issued by a dispatching center, selecting BESS with the current charge and discharge state matched with the demand dispatching direction from the two BESS, and assisting the thermal power generating unit system to respond to the AGC instruction.
It can be understood that the embodiment of the device corresponds to the embodiment of the method of the invention, and the device for collaborative operation of the fire-storage hybrid power station based on the battery energy storage system provided by the embodiment of the invention can realize the collaborative operation method of the fire-storage hybrid power station based on the battery energy storage system provided by any one of the embodiments of the method of the invention.
The invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the fire-storage hybrid power station co-operation method based on the battery energy storage system of any one of the above.
It should be noted that the above-described apparatus embodiments are merely illustrative, and the units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the device provided by the invention, the connection relation between the modules represents that the modules have communication connection, and can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
It will be clear to those skilled in the art that, for convenience and brevity, the specific working process of the apparatus described above may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
The terminal device may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The terminal device may include, but is not limited to, a processor, a memory.
The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, which is a control center of the terminal device, and which connects various parts of the entire terminal device using various interfaces and lines.
The memory may be used to store the computer program, and the processor may implement various functions of the terminal device by running or executing the computer program stored in the memory and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the use of the cellular phone, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
The storage medium is a computer readable storage medium, and the computer program is stored in the computer readable storage medium, and when executed by a processor, the computer program can implement the steps of the above-mentioned method embodiments. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.

Claims (3)

1. A method for collaborative operation of a fire-storage hybrid power station based on a battery energy storage system, comprising:
dividing a battery energy storage system into two parts of BESS, and respectively connecting the two parts of BESS to a thermal power unit system; wherein, the two BESS parts are always in different charge and discharge states;
determining a demand dispatching direction based on an AGC instruction issued by a dispatching center, selecting BESS with the current charge and discharge state matched with the demand dispatching direction from the two BESS, and assisting the thermal power generating unit system to respond to the AGC instruction;
the method for determining the demand dispatching direction based on the AGC instruction issued by the dispatching center selects BESS with the current charge and discharge state matched with the demand dispatching direction from the two BESS, and assists the thermal power generating unit system to perform AGC instruction response, and comprises the following steps:
if the AGC command issued by the dispatching center is judged to be an ascending command, determining the current demand dispatching direction as the unit output increasing direction, and selecting the BESS in a discharging state to assist the thermal power unit system to carry out AGC command response;
if the AGC command issued by the dispatching center is judged to be a descending command, determining the current demand dispatching direction as a unit output reduction, and selecting BESS in a charging state to assist the thermal power unit system to perform AGC command response;
if the AGC command issued by the dispatching center is judged to be an ascending command, the maximum capacity of the frequency modulator is controlled to increase the output of the thermal power unit;
if the AGC command issued by the dispatching center is judged to be a lowering command, the maximum capacity of the frequency modulator is controlled to reduce the output of the thermal power unit;
the battery energy storage system is divided into two parts of BESS, specifically:
the battery energy storage system is divided into two parts of BESS with equal capacity.
If any part of BESS is monitored to be fully charged or fully discharged, switching the charging and discharging states of the part of BESS;
if it is monitored that any part of the BESS is fully charged or fully discharged, the charging and discharging states of the part of the BESS are switched, specifically:
if any part of BESS is monitored to be fully charged or fully discharged, switching the charging and discharging states of the part of BESS, and synchronously switching the charging and discharging states of the other part of BESS;
the method comprises the steps that the demand dispatching direction is determined based on an AGC instruction issued by a dispatching center, BESS with the current charge and discharge state matched with the demand dispatching direction is selected from two BESS, and the thermal power generating unit system is assisted to respond to the AGC instruction, and specifically comprises the following steps:
the first part BESS and the second part BESS are respectively in a discharging state and a charging state at the issuing time of the AGC command i;
after receiving the AGC ascending instruction, the thermal power generating unit immediately climbs up at the maximum climbing speed v up The power generation output is increased, the AGC rising instruction is responded, and according to the response effect, the power generation output can be divided into the following three conditions:
the first condition indicates that the thermal power generating unit can track the target output of the upper AGC command i in the duration of the AGC command i, and the power generating output P g,t Expressed as:
wherein P is g,t Generating power for the thermal power generating unit at the time t; i is an AGC instruction index; t (T) s,i Starting time of AGC command i; t (T) 1,i Tracking the moment of the output of the upper AGC command target in the duration of the AGC command period i for the thermal power generating unit; t (T) s,i+1 The issuing time of the next AGC command is given; p0 g, i is the generated output of the thermal power unit at the time of issuing the AGC command i; p (P) AGC,i Target output for AGC instruction i;
the second condition indicates that the thermal power generating unit cannot track the up AGC command in the duration of the AGC command i, but can track the target output of the up AGC command i before the next AGC command is issued, and the power generating unit generates the output P g,t Expressed as:
wherein T is 2,i Tracking the moment of the target output of the upper AGC command i before the next AGC command is issued for the thermal power generating unit;
the third condition indicates that the thermal power generating unit still cannot track the target output of the upper AGC command i when the next AGC command is issued, and the power generating output P of the thermal power generating unit g,t Expressed as:
for the AGC ascending instruction, on the basis of response of the thermal power generating unit, the second part BESS in a charging state stands by, and the first part BESS in a discharging state is controlled to assist the thermal power generating unit to participate in secondary frequency modulation, and the discharging power is expressed as:
in the formula, PI b, t is the discharge power of the first part BESS before the next AGC instruction is issued; PI dmax, t is the maximum discharge power that the first portion BESS can provide at time t, expressed as:
wherein P is dis Rated discharge power per unit capacity BESS; e (E) c The BESS total capacity of the thermal power plant is accessed; η (eta) d Is the discharge efficiency; Δt is the cooperative control period length; s is S min The minimum allowable value of the BESS charge state is set; s is S Ⅰ,t The state of charge at time t for the first portion BESS is expressed as:
wherein S is Ⅰ,t-1 The charge at time t-1 for the first portion BESSAn electrical state; PIb, t-1 is the discharge power of the first portion BESS at time t-1;
after receiving the AGC lowering instruction, the thermal power generating unit immediately climbs down at the maximum climbing speed v down The power generation output is reduced, the AGC lowering instruction is responded, and according to the response effect, the three conditions are divided as follows:
the first condition indicates that the thermal power generating unit can track the target output of the upper AGC command i in the duration of the AGC command i, and the power generating output P g,t Expressed as:
the second condition indicates that the thermal power generating unit cannot track the up AGC command in the duration of the AGC command i, but can track the target output of the up AGC command i before the next AGC command is issued, and the power generating unit generates the output P g,t Expressed as:
the third condition indicates that the thermal power generating unit still cannot track the target output of the upper AGC command i when the next AGC command is issued, and the power generating output P of the thermal power generating unit g,t Expressed as:
for the AGC lowering instruction, on the basis of response of the thermal power generating unit, the first part BESS in a discharging state stands by, and the second part BESS in a charging state is controlled to charge to assist the thermal power generating unit to respond to the AGC instruction, which is expressed as:
wherein PII b, t is the charging power of the second part BESS before the next AGC instruction is issued; PII cmax, t is the maximum charge power that the second portion BESS can provide at time t, expressed as:
wherein P is ch Rated charge power for a unit capacity BESS; η (eta) c Is the charging efficiency; s is S max Is the maximum allowable value of the charge state; s is S ⅠI,t For the state of charge of the second portion BESS at time t, it is calculated by:
wherein S is ⅠI,t-1 The state of charge at time t-1 for the second portion BESS; PIIb, t-1 is the charging power of the second portion BESS at time t-1.
2. A terminal device comprising a processor and a memory storing a computer program, characterized in that the processor, when executing the computer program, implements the battery energy storage system based fire-storage hybrid power station co-operation method of claim 1.
3. A non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of co-operating a battery energy storage system based fire-storage hybrid power station as claimed in claim 1.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110535155A (en) * 2019-07-25 2019-12-03 微控物理储能研究开发（深圳）有限公司 Hybrid energy-storing control system and control method for thermoelectricity joint AGC frequency modulation
CN110867878A (en) * 2019-12-16 2020-03-06 上海豫源电力科技有限公司 Control method for energy storage of flywheel energy storage hybrid lithium battery

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110535155A (en) * 2019-07-25 2019-12-03 微控物理储能研究开发（深圳）有限公司 Hybrid energy-storing control system and control method for thermoelectricity joint AGC frequency modulation
CN110867878A (en) * 2019-12-16 2020-03-06 上海豫源电力科技有限公司 Control method for energy storage of flywheel energy storage hybrid lithium battery

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