CN110323760B - Energy storage system output oscillation suppression method and suppressor - Google Patents
Energy storage system output oscillation suppression method and suppressor Download PDFInfo
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- CN110323760B CN110323760B CN201910386291.5A CN201910386291A CN110323760B CN 110323760 B CN110323760 B CN 110323760B CN 201910386291 A CN201910386291 A CN 201910386291A CN 110323760 B CN110323760 B CN 110323760B
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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Abstract
The application provides an energy storage system output oscillation suppression method and a suppressor, wherein the method comprises the following steps: and executing a first oscillation control strategy when the energy storage battery pack feeds back the temperature value in real time, and executing a second oscillation control strategy when the energy storage battery pack feeds back the over-temperature protection signal in real time. The technical scheme that this application provided feeds back BAMS with group battery operation or outage state, and according to group battery operation or outage state distribution power output to improve group battery management strategy, restrain the energy storage system and exert oneself and vibrate, make energy storage system be adapted to electric power frequency modulation operating mode, prevent that energy storage system from exerting oneself power and vibrate.
Description
Technical Field
The application relates to the technical field of power grids, in particular to an output oscillation suppression method and an output oscillation suppressor for an energy storage system.
Background
According to the requirements of a scheduling protocol, a large grid-connected unit needs to participate in the frequency modulation of the power system, namely, the output power is increased or reduced in time according to a scheduling control instruction of the power system, and the balance of the overall generated energy and the power consumption of the power system is ensured, so that the stable operation of a power grid is ensured. Various types of units are required to participate in frequency modulation according to requirements and are included in a power supply assessment range. In recent years, a thermal power and energy storage combined frequency modulation mode is rapidly popularized and applied. The thermal power and energy storage combined frequency modulation technology can give full play to respective advantages of a traditional unit and an energy storage device, and can quickly respond to a power system frequency modulation instruction. Under the frequency modulation application environment, the energy storage system bears most of short-time output changes required by frequency modulation.
The traditional energy storage system is formed by connecting energy storage battery packs in series and parallel in a large scale, a battery management system BMS and a battery pack SOC estimation method are adopted, and a certain control strategy is applied to distribute power to the battery packs in a balanced mode. The strategy can ensure the balance of each battery pack of the system and ensure the charge and discharge level of the battery pack under certain operating environment.
The thermal power and energy storage combined frequency modulation application scene is different from a common energy storage application scene, due to the frequency modulation requirement, an AGC (automatic gain control) can frequently give instructions, and an energy storage system is matched with a thermal power unit to perform combined action. The energy storage system is not fully charged and discharged, the average electric quantity is about 50% for a long time, but the energy storage system frequently acts in a short time, and the energy storage system is often in a large-current charging and discharging state. The conventional battery management system BMS and the SOC estimation method can distribute power to the battery pack in a balanced manner based on the electric quantity balance of the battery pack, and in addition, the battery pack is subjected to over-temperature protection. However, the existing method cannot be completely adapted to the working condition of thermal-electric energy storage combined frequency modulation, and has the following problems.
Under the working condition of thermal power and electrical energy storage combined frequency modulation, the unit and the energy storage system quickly respond to a power system frequency modulation instruction, wherein the energy storage system bears most of short-time output changes required by frequency modulation. Therefore, compared with the working condition of the operation of a common energy storage battery, the energy storage system can be frequently in the working conditions of large-current charging and large-current discharging, and the battery pack is subjected to over-temperature protection. Specifically, power system frequency modulation instruction is given, and each group battery is given under the BMS charge-discharge power instruction, and group battery heavy current charges or discharges, leads to the group battery intensification overheated, and group battery management module starts protection program, and absorption/output power reduces to 0, and the temperature reduces. When the temperature is reduced to the safe range, the BMS command is executed again, and the absorption/output power is recovered to be normal. And the battery pack is heated and overheated, protection is triggered, and the absorption/output power is reduced to 0. The battery pack is cycled in this manner, causing the overall absorbed/output power oscillation of the energy storage system, which may cause part of the electrical connection loop to oscillate. Therefore, power oscillations of the energy storage system need to be eliminated.
Disclosure of Invention
The application provides an energy storage system output oscillation suppression method and an energy storage system output oscillation suppressor, which are used for eliminating power oscillation of an energy storage system.
In view of the above, a first aspect of the present application provides a method for suppressing output oscillation of an energy storage system, including:
executing a first oscillation control strategy when the energy storage battery pack feeds back a temperature value in real time, and executing a second oscillation control strategy when the energy storage battery pack feeds back an over-temperature protection signal in real time;
the first oscillation control strategy comprises the following steps:
a1, receiving and analyzing the battery pack temperature and protection information of the BAMS battery pack management system;
a2, judging whether the temperature of the battery pack is greater than a preset threshold TH, if so, executing step A3, and if not, executing step A5;
a3, starting battery pack protection, setting the battery pack to stop merging, and calculating by the BMS to ignore the battery pack;
a4, judging whether the temperature of the battery pack stopped to be merged is smaller than a preset threshold TL, if so, executing a step A5, and if not, executing a step A3;
a5, setting the battery pack to be merged and carrying out BMS charge and discharge power calculation;
the second oscillation control strategy comprises the following steps:
b1, receiving and analyzing the protection information of the BAMS battery stack management system;
b2, detecting whether the battery pack enters temperature protection, if so, executing a step B3, and if not, executing a step B5;
b3, starting battery pack protection, setting the battery pack to stop merging, and calculating by the BMS to ignore the battery pack;
b4, judging whether the temperature protection time for stopping the merged battery pack from entering is greater than a preset threshold Tset, if so, executing a step B5, and if not, executing a step B3;
and B5, setting the battery pack to be integrated and carrying out BMS charge and discharge power calculation.
Preferably, the step a3 is specifically:
and setting the battery pack to stop merging operation, controlling the port power to be 0, and feeding back to the BAMS.
Preferably, the step B3 is specifically:
and setting the battery pack to stop merging operation, controlling the port power to be 0, and feeding back to the BAMS.
The second aspect of the present application provides a method for suppressing and debugging output oscillation of an energy storage system, including:
s1, starting the test;
s2, calling the current BMS control strategy;
s3, carrying out experimental test and obtaining preset parameters;
s4, detecting whether the preset parameters are in the preset range, if so, generating a test report and finishing, otherwise, executing a step S5;
s5, evaluating and calculating a preset threshold Tset or a preset threshold TL according to the test result;
and S6, adding the energy storage system output oscillation suppression method of the first aspect to the current BMS control strategy, and returning to execute the step S3.
Preferably, the step S5 includes:
calculating a preset threshold value TL according to a preset threshold value TL calculation formula;
the preset threshold TL is calculated by the formula:
TL＝TH-K1*f/T；
wherein, TH is the temperature protection value set by the battery factory, f is the frequency of the whole output oscillation, T is the estimated temperature reduction coefficient, and K1 is the preset first adjustment coefficient.
Preferably, the step S5 includes:
calculating a preset threshold value Tset according to a preset threshold value Tset calculation formula;
the preset threshold Tset is calculated according to the formula:
Tset＝K2*f/T；
wherein f is the frequency of the whole output oscillation, T is the estimated temperature drop coefficient, and K2 is a preset second adjustment coefficient.
The third aspect of the present application provides an energy storage system output oscillation suppressor, where the energy storage system output oscillation suppressor is connected to a battery stack management system of an energy storage system, and is configured to execute the energy storage system output oscillation suppression method of the first aspect or execute the energy storage system output oscillation suppression debugging method of the second aspect.
Preferably, the battery stack management system is connected with the data acquisition and monitoring control system, the background server and the energy storage converter through the first switch.
Preferably, the battery stack management system is connected with the battery cluster management system through a second switch;
the battery cluster management system is connected with the battery management unit.
Preferably, the battery management unit is used for completing the functions of single battery voltage acquisition, multipoint temperature acquisition and battery pack balance control.
According to the technical scheme, the method has the following advantages:
the application provides an energy storage system output oscillation suppression method and a suppressor, wherein the method comprises the following steps: and executing a first oscillation control strategy when the energy storage battery pack feeds back the temperature value in real time, and executing a second oscillation control strategy when the energy storage battery pack feeds back the over-temperature protection signal in real time. The technical scheme that this application provided feeds back BAMS with group battery operation or outage state, and according to group battery operation or outage state distribution power output to improve group battery management strategy, restrain the energy storage system and exert oneself and vibrate, make energy storage system be adapted to electric power frequency modulation operating mode, prevent that energy storage system from exerting oneself power and vibrate.
Drawings
In order to illustrate the embodiments of the present application more clearly, the drawings that are needed for describing the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive exercise.
Fig. 1 is a schematic diagram of an embodiment of an energy storage system output oscillation suppressor provided in the present application;
fig. 2 is a flowchart of a first strategy in an embodiment of a method for suppressing oscillation of output of an energy storage system according to the present disclosure;
fig. 3 is a flowchart of a second strategy in an embodiment of a method for suppressing oscillation of output of an energy storage system according to the present application;
fig. 4 is a flowchart illustrating an embodiment of a method for debugging output oscillation suppression of an energy storage system according to the present application;
wherein the reference numerals are:
1. a data acquisition And monitoring Control system SCADA (Supervisory Control And DataAcquisition); 2. a background server; 3. energy storage converter PCS (Power conversion System); 4. battery array management system bams (battery array management system); 5. the energy storage system output oscillation suppressor hardware; 6. a first switch; 7. a second switch; 8. BCMS is a battery cluster management system; 9. the BMU is a battery management unit.
Detailed Description
The application provides an energy storage system output oscillation suppression method and an energy storage system output oscillation suppressor, which are used for eliminating power oscillation of an energy storage system.
In order to make the objects, features and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
First, partial nouns or terms appearing in the description of the embodiments of the present application are applicable to the following explanations:
an energy storage system: the energy storage system is formed by a reasonable structure and is connected with a thermal power generating set bus in parallel to form a thermal power energy storage combined frequency modulation generating set. The power regulation method is used for power grid frequency regulation and needs to respond to power increase and decrease instructions sent by a power grid dispatching mechanism in time. The energy storage system can realize bidirectional rapid adjustment of power increase and decrease, power needs to be increased in a power grid, and the energy storage system enters a discharge state and increases the power provided by the power grid together with the generator; the power of the power grid needs to be reduced, the energy storage system enters a charging state, partial power of the generator is absorbed, and the power provided for the power grid is reduced. The system response time is fast, and the adjustment precision is accurate.
Thermal power and energy storage combined frequency modulation: the large grid-connected unit needs to participate in the frequency modulation of the power system, and the output of the unit is adjusted in time according to the output adjusting instruction of the power system. The thermal power generating unit has a large adjusting range, but the adjusting speed is low, the response time is long, and the adjusting precision is not ideal. Although the energy storage battery pack is high in cost and small in adjusting capacity, the adjusting speed is high, positive and negative bidirectional rapid adjustment can be achieved, the response time is short, and the adjusting precision is accurate. The thermal power and electric energy storage combined frequency modulation technology can fully exert respective advantages of the traditional unit and the energy storage device.
SCADA: a data acquisition And monitoring Control system (Supervisory Control And DataAcquisition);
PCS: a Power Conversion System;
BAMS: a battery array management system (battery array management system);
BCMS: a battery cluster management system (battery cluster management system);
BMU: a battery management unit (battery management unit);
referring to fig. 1, in an embodiment of an energy storage system output oscillation suppressor provided in the present application, an energy storage system output oscillation suppressor 5 is connected to a cell stack management system 4 of an energy storage system, and is configured to execute the energy storage system output oscillation suppression method of the first aspect or execute the energy storage system output oscillation suppression debugging method of the second aspect.
The battery stack management system 4 is connected with the data acquisition and monitoring control system 1, the background server 2 and the energy storage converter 3 through the first switch 6.
The battery stack management system 4 is connected with a battery cluster management system 8 through a second switch 7;
the battery cluster management system 8 is connected to a battery management unit 9.
The battery management unit 9 is used for completing the functions of single battery voltage acquisition, multipoint temperature acquisition and battery pack balance control.
The energy storage system in the present application adopts a layered 3-layer management system, as shown in fig. 1, which includes
Bottom layer: a plurality of Battery Management Units (BMUs) mainly complete the functions of single battery voltage acquisition, multipoint temperature acquisition and battery pack balance control.
Middle layer: the system comprises a plurality of Battery Cluster Management Systems (BCMS) and a plurality of BMUs, wherein the BCMS is responsible for managing all BMUs in 1 battery string, the BCMS is responsible for total voltage acquisition, charging and discharging current acquisition, electric leakage detection and fault alarm of the battery string, calculating the percentage of the residual electric quantity of the battery and the health degree of the battery, realizing high-voltage management and completing the balance control of the whole battery string under the cooperation of the BMUs.
Top layer: the battery stack management system BAMS is responsible for managing all BCMSs of 1 energy storage converter PCS corresponding to battery system units, collects data information and alarms of all batteries, collects, statistically analyzes and processes the information of the battery system units, and reports the battery system information and the alarms to a data acquisition and monitoring control system SCADA and the energy storage converter PCS to realize PCS optimal control. The energy storage system output oscillation suppressor hardware interacts with battery stack management system BAMS (battery array management system) information of the energy storage system to provide battery pack running or shutdown state information for the BAMS. Wherein the energy storage system output oscillation suppressor hardware and BAMS communication interface mainly includes: and the temperature information and the protection information of the BAMS battery pack are transmitted to the energy storage system output oscillation suppressor hardware in real time, and the energy storage system output oscillation suppressor hardware feeds back the running or shutdown state of the battery pack to the BAMS. The BAMS distributes output according to the running or outage state of the battery pack, so that the management strategy of the battery pack is improved, and the output oscillation of an energy storage system is inhibited.
Referring to fig. 2 and fig. 3, the present application provides a method for suppressing oscillation output of an energy storage system, including:
executing a first oscillation control strategy when the energy storage battery pack feeds back a temperature value in real time, and executing a second oscillation control strategy when the energy storage battery pack feeds back an over-temperature protection signal in real time;
the first oscillation control strategy is shown in fig. 2, and the second oscillation control strategy is shown in fig. 3; the implementation of the method is implemented according to the condition of the energy storage battery pack, if the energy storage battery pack feeds back the temperature value in real time, the first strategy for inhibiting the output oscillation of the energy storage system in the figure 2 is adopted, and if the energy storage battery pack can only feed back an over-temperature protection signal, the second strategy for inhibiting the output oscillation of the energy storage system in the figure 3 is adopted.
Referring to fig. 2, the oscillation control strategy one includes:
a1, receiving and analyzing the battery pack temperature and protection information of the BAMS battery pack management system;
after the energy storage system receives the AGC frequency modulation command, the battery management system BMS calculates and distributes power adjustment quantity (namely BMS command) to each battery pack according to the frequency modulation command.
A2, judging whether the temperature of the battery pack is greater than a preset threshold TH, if so, executing step A3, and if not, executing step A5;
a3, starting battery pack protection, setting the battery pack to stop merging, and calculating by the BMS to ignore the battery pack;
step a3 may be: and setting the battery pack to stop merging operation, controlling the port power to be 0, and feeding back to the BAMS.
A4, judging whether the temperature of the battery pack stopped to be merged is smaller than a preset threshold TL, if so, executing a step A5, and if not, executing a step A3;
a5, setting the battery pack to be merged and carrying out BMS charge and discharge power calculation;
and (4) removing the protection of the battery pack, merging the battery pack, normally running and carrying out BMS charge and discharge power calculation.
Referring to fig. 3, the oscillation control strategy two includes:
b1, receiving and analyzing the protection information of the BAMS battery stack management system;
after the energy storage system receives the AGC frequency modulation command, the battery management system BMS calculates and distributes power adjustment quantity (namely BMS command) to each battery pack according to the frequency modulation command.
B2, detecting whether the battery pack enters temperature protection, if so, executing a step B3, and if not, executing a step B5;
b3, starting battery pack protection, setting the battery pack to stop merging, and calculating by the BMS to ignore the battery pack;
step B3 may be: and setting the battery pack to stop merging operation, controlling the port power to be 0, and feeding back to the BAMS.
B4, judging whether the temperature protection time for stopping the merged battery pack from entering is greater than a preset threshold Tset, if so, executing a step B5, and if not, executing a step B3;
and B5, setting the battery pack to be integrated and carrying out BMS charge and discharge power calculation.
And the battery pack is merged and normally runs, and the BMS charging and discharging power is calculated.
The energy storage system output oscillation suppressor software control strategy comprises two key parameters Tset and TL, and the parameters are obtained through calculation and test of a test method due to different climates, temperatures and application scenes in different regions, so that a control strategy debugging test method is provided for selection of the key parameters, and the most available parameters Tset and TL are obtained through the debugging test.
Referring to fig. 4, the present application provides a method for suppressing and debugging output oscillation of an energy storage system, including:
s1, starting the test;
s2, calling the current BMS control strategy;
and other control strategies are not added, and the original BMS control strategy is maintained. And (5) carrying out test testing under the condition that the system is debugged to be qualified.
S3, carrying out experimental test and obtaining preset parameters;
and (4) test testing, setting working conditions of full power output, half power output, full power absorption and half power absorption, and recording the power output or absorption condition of the energy storage system. (output power, i.e. energy storage system discharge, absorbed power, i.e. energy storage system charge).
S4, detecting whether the preset parameters are in the preset range, if so, generating a test report and finishing (compiling the test report according to the test result, recording detailed parameters and increasing the comparison before and after the control strategy), otherwise, executing the step S5;
through test, the influence of power adjustment is removed, and whether the power fluctuation range is in the expected requirement range is calculated;
s5, evaluating and calculating a preset threshold Tset or a preset threshold TL according to the test result;
step S5 includes:
calculating a preset threshold value TL according to a preset threshold value TL calculation formula;
the preset threshold TL is calculated as:
TL＝TH-K1*f/T；
wherein, TH is the temperature protection value set by the battery factory, f is the frequency of the whole output oscillation, T is the estimated temperature reduction coefficient, and K1 is the preset first adjustment coefficient.
Step S5 includes:
calculating a preset threshold value Tset according to a preset threshold value Tset calculation formula;
the preset threshold Tset is calculated by the formula:
Tset＝K2*f/T；
wherein f is the frequency of the whole output oscillation, T is the estimated temperature drop coefficient, and K2 is a preset second adjustment coefficient.
And evaluating and calculating TH and TL according to the test result. TH is a temperature protection value set by a battery factory. Evaluating the frequency f of the integral output oscillation according to the test result of the step 23; evaluating a temperature reduction coefficient T according to the use environment, namely the time required for reducing the temperature by 1 ℃ after the over-temperature protection action; according to the adjustment coefficient K1, the adjustment coefficient is variable and is suitable for the first control strategy for restraining the output shock of the energy storage system, and TL-TH-K1 f/T is calculated. Or the adjustment coefficient K2 is a variable quantity, and the Tset is calculated to be K2 f/T and is applicable to the second control strategy for restraining the output oscillation of the energy storage system.
And S6, adding the energy storage system output oscillation suppression method to the current BMS control strategy, and returning to execute the step S3.
And adding a software control strategy of the energy storage system output oscillation suppressor, wherein the control strategy is detailed in the steps shown in fig. 2 and fig. 3.
In this application through the energy storage system of thermal power energy storage combined frequency modulation generating set, increase in energy storage system BAMS the energy storage system vibrates the inhibitor that is exerted oneself for energy storage system is adapted to electric power frequency modulation operating mode, prevents that the energy storage system from exerting oneself and appearing the power and vibrate.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (6)
1. An energy storage system output oscillation suppression debugging method is characterized by comprising the following steps:
s1, starting the test;
s2, calling the current BMS control strategy;
s3, carrying out experimental test and obtaining preset parameters; wherein the predetermined parameters include output power of the energy storage system, absorbed power of the energy storage system;
s4, detecting whether the preset parameters are in the preset range, if so, generating a test report and finishing, otherwise, executing a step S5; wherein the preset range comprises the output power fluctuation range and the absorption power fluctuation range;
s5, evaluating and calculating a preset threshold Tset or a preset threshold TL according to the test result;
s6, adding an oscillation control strategy to the current BMS control strategy according to the information fed back by the energy storage battery pack, and returning to execute the step S3;
the adding of the oscillation control strategy to the current BMS control strategy according to the information fed back by the energy storage battery pack comprises:
executing a first oscillation control strategy when the energy storage battery pack feeds back a temperature value in real time, and executing a second oscillation control strategy when the energy storage battery pack feeds back an over-temperature protection signal in real time;
the first oscillation control strategy comprises the following steps:
a1, receiving and analyzing the battery pack temperature and protection information of the BAMS battery pack management system;
a2, judging whether the temperature of the battery pack is greater than a preset threshold TH, if so, executing step A3, and if not, executing step A5;
a3, starting battery pack protection, setting the battery pack to stop merging, and calculating by the BMS to ignore the battery pack;
a4, judging whether the temperature of the battery pack stopped to be merged is smaller than a preset threshold TL, if so, executing a step A5, and if not, executing a step A3;
a5, setting the battery pack to be merged and carrying out BMS charge and discharge power calculation;
the preset threshold value TL is smaller than the preset threshold value TH;
the second oscillation control strategy comprises the following steps:
b1, receiving and analyzing the protection information of the BAMS battery stack management system;
b2, detecting whether the battery pack enters temperature protection, if so, executing a step B3, and if not, executing a step B5;
b3, starting battery pack protection, setting the battery pack to stop merging, and calculating by the BMS to ignore the battery pack;
b4, judging whether the temperature protection time for stopping the merged battery pack from entering is greater than a preset threshold Tset, if so, executing a step B5, and if not, executing a step B3;
and B5, setting the battery pack to be integrated and carrying out BMS charge and discharge power calculation.
2. The energy storage system output oscillation suppression and debugging method according to claim 1, wherein the step a3 specifically comprises:
and setting the battery pack to stop merging operation, controlling the port power to be 0, and feeding back to the BAMS.
3. The energy storage system output oscillation suppression and debugging method according to claim 1, wherein the step B3 specifically comprises:
and setting the battery pack to stop merging operation, controlling the port power to be 0, and feeding back to the BAMS.
4. The method for debugging output oscillation suppression of an energy storage system according to claim 1, wherein the step S5 comprises:
calculating a preset threshold value TL according to a preset threshold value TL calculation formula;
the preset threshold TL is calculated by the formula:
TL＝TH-K1*f/T；
wherein, TH is the temperature protection value set by the battery factory, f is the frequency of the whole output oscillation, T is the estimated temperature reduction coefficient, and K1 is the preset first adjustment coefficient.
5. The method for debugging output oscillation suppression of an energy storage system according to claim 1, wherein the step S5 comprises:
calculating a preset threshold value Tset according to a preset threshold value Tset calculation formula;
the preset threshold Tset is calculated according to the formula:
Tset＝K2*f/T；
wherein f is the frequency of the whole output oscillation, T is the estimated temperature drop coefficient, and K2 is a preset second adjustment coefficient.
6. An energy storage system output oscillation suppressor, which is connected to a cell stack management system of an energy storage system, and is configured to perform the energy storage system output oscillation suppression debugging method according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910386291.5A CN110323760B (en) | 2019-05-09 | 2019-05-09 | Energy storage system output oscillation suppression method and suppressor |
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