CN109884434B - Joint debugging test method, system and medium for battery energy storage power station system - Google Patents
Joint debugging test method, system and medium for battery energy storage power station system Download PDFInfo
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Abstract
The invention discloses a joint debugging test method, a system and a medium for a battery energy storage power station system, which comprises the steps of determining the safe operation boundary condition of a battery stack; determining safety boundary conditions of a BMS system and a PCS system by using the safety operation boundary conditions of the cell stack; a test flow step of matching the joint debugging unit to determine a joint debugging range and generate joint debugging; and sequentially executing the test flow steps, monitoring the switch state information in the executing process, and sending an alarm signal when the switch state information is not matched with the safe operation boundary conditions of the battery stack or the safe boundary conditions of the BMS system and the PCS system. The invention can assist the debugging work of the energy storage power station to be smoothly carried out, ensures that the system joint debugging test of the energy storage power station runs in a safe working range, assists the testing personnel to realize automatic management and monitoring on the debugging process, and improves the efficiency and the safety of the debugging of the energy storage power station.
Description
Technical Field
The invention relates to a subsystem joint debugging method in the construction process of a battery energy storage power station at the power grid side of a power system, in particular to a joint debugging test method, a system and a medium for a battery energy storage power station system.
Background
With the development of battery technology, the technology of electrochemical energy storage power stations of lithium ion batteries is becoming mature and the economy is gradually improved, and the large-scale application of the battery energy storage power stations is started on the power grid side at present. The battery energy storage power station is internally divided into an Energy Management System (EMS), a Power Conversion System (PCS), a battery pack and a corresponding Battery Management System (BMS). In the battery energy storage power station at the power grid side, the number of the single battery cores is large, and because the danger of the electrochemical battery is high, the state monitoring of each single battery core is needed, so that the remote measurement and remote signaling data volume of the energy storage power station is large. In addition, unlike conventional power stations, battery storage power stations can operate in both charging and discharging states, with more complex internal control logic. The combined effect of the factors enables the debugging workload of the energy storage power station system to be increased remarkably compared with that of a conventional substation. The quality of the debugging work of the energy storage power station directly determines the reliability of the power station. If the defects in the internal control logic of the energy storage power station cannot be found in the debugging stage, the defects will cause adverse effects on the safe, stable, economical and reliable operation of the power grid after the power grid is put into operation.
In order to ensure the smooth grid connection of the battery energy storage power station on the newly-built power grid side, the internal equipment and the composition system of the energy storage power station need to be comprehensively debugged, and the debugging work can be specifically divided into three stages, namely a single system debugging stage, a subsystem joint debugging stage and an energy storage power station integral starting debugging stage. The single system debugging stage is mainly used for testing whether the design of the single equipment meets relevant standards. The joint debugging stage of the subsystems is mainly used for testing whether the communication between the systems is correct and whether the control logic is reasonable. And the integral starting and debugging stage is mainly used for testing whether the integral characteristics of the energy storage power station meet the relevant requirements of grid-connected operation. Through the debugging process, the function and performance of the single equipment, the complete system and the total station system in the energy storage power station can be tested, and the overall design of the energy storage power station is ensured to meet the relevant standards.
For example, chinese patent application No. 201611208933.5 discloses a method and a device for debugging an energy storage converter, in which a control program of the energy storage converter can be tested without interfering with its normal operation by comparing a relevant parameter and an address issued to the energy storage converter by an upper computer of the debugging device with a feedback value corresponding to the energy storage converter. The method provided by the patent is only limited to a software system for testing the energy storage converter, and although the software debugging efficiency of the energy storage converter in the PCS system can be improved, the method does not relate to the joint debugging between a hardware system of the energy storage converter and a subsystem related to the hardware system.
Chinese patent application No. 201721614251.4 discloses a BMS debugging device including an upper computer, a fault simulation apparatus, and a communication module including a CAN bus analyzer and a dual channel communication board. The patent discusses a method for debugging the BMS system of the energy storage unit by using the device, and the BMS testing efficiency and precision can be improved by using the device. Although this patent has solved the monomer debugging of BMS module in the energy storage station, but only be applicable to the module test before dispatching from the factory, more do not relate to the field debugging after the BMS installation and the joint debugging test between BMS and PCS, EMS.
Chinese patent application No. 201810106390.9 discloses a system and method for commissioning an Energy Storage System (ESS). The patent discusses an abstracted energy storage system debugging step, and the debugging method focuses on testing the running state of related equipment and performing fault treatment in the energy storage system debugging process. The invention does not relate to the evaluation of the debugging conditions of the energy storage system, the management of the debugging process and the monitoring of the debugging process. However, in the debugging process of the energy storage power station on the power grid side, in order to ensure the safety of the electrochemical cell, the PCS and other devices, the test conditions in the debugging process need to be fully evaluated, and the efficiency and the safety of the debugging work can be further improved through the management and the monitoring of the debugging process.
At present, the construction scale of an energy storage power station is continuously enlarged, the number of devices needing to be debugged in the power station is continuously increased, the corresponding debugging workload is gradually increased, and the safety risk in the debugging process is also improved. The existing energy storage power station debugging work is completely processed manually, the risks of low repeated labor efficiency and easy carelessness of safety risk supervision exist, and the efficiency and the safety of energy storage power station debugging are restricted by the factors.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the invention provides a joint debugging test method, a joint debugging test system and a joint debugging test medium for a battery energy storage power station system.
In order to solve the technical problems, the invention adopts the technical scheme that:
a joint debugging test method for a battery energy storage power station system comprises the following implementation steps:
1) determining a safe operation boundary condition of the battery stack;
2) determining safety boundary conditions of a BMS system and a PCS system by using the safety operation boundary conditions of the cell stack;
3) a test flow step of matching the joint debugging unit to determine a joint debugging range and generate joint debugging;
4) and sequentially executing the test flow steps, monitoring the switch state information in the executing process, and sending an alarm signal when the switch state information is not matched with the safe operation boundary conditions of the battery stack or the safe boundary conditions of the BMS system and the PCS system.
Optionally, the detailed step of determining the safe operation boundary condition of the cell stack in step 1) includes:
1.1) reading battery design parameters and parameter measurement precision information of a BMS system and a PCS system, wherein the battery design parameters comprise battery and PCS system design parameter values, battery state of charge parameters and field environment parameters;
1.2) obtaining a relation curve cluster of the open-circuit voltage and the SOC of the battery cell under the specified environmental parameters according to the read battery design parameters;
1.3) comparing the acquired cell open-circuit voltage of the installation site with the relation curve cluster, and estimating the open-circuit voltage and the state of charge (SOC) of the single cell;
1.4) estimating the open-circuit voltage and the SOC of the whole battery stack according to the open-circuit voltage and the SOC of the single battery cell;
1.5) determining the boundary conditions of the open-circuit voltage and the SOC of the whole cell stack according to the parameter measurement accuracy of the BMS system and the PCS system to serve as the boundary conditions of the safe operation of the cell stack.
Optionally, the functional expression of the open-circuit voltage and the state of charge SOC of the whole cell stack estimated in step 1.4) is as shown in formula (1);
in the formula (1), SsocIs the SOC state of the cell stack, Bsoc_iThe open-circuit voltage and the state of charge SOC of each ith monomer cell, n is the number of the monomer cells, C is the rated capacity of the monomer cellstotalIs the rated capacity of the entire stack.
Optionally, the boundary conditions for determining the open-circuit voltage and the state of charge SOC of the entire cell stack in step 1.5) include a lower boundary of (10% + x%) and an upper boundary of (90% -x%), where x% is the parameter measurement accuracy of the BMS system and the PCS system.
Optionally, the detailed steps of step 2) include:
2.1) obtaining the chargeable and dischargeable capacity of the cell stack according to the integral open-circuit voltage, the SOC (state of charge) and boundary conditions of the cell stack, using the chargeable and dischargeable capacity of the cell stack as power constraint of a cell stack charge-discharge test, and dividing the chargeable and dischargeable capacity of the cell stack by corresponding charge-discharge power to obtain time constraint of the cell stack charge-discharge test;
2.2) obtaining the corresponding maximum and minimum values of the open-circuit voltage of the battery by utilizing the power constraint and the duration constraint of the charge-discharge test of the battery stack, wherein the voltage values are respectively used as the fixed values of overvoltage and undervoltage protection of the BMS system and used as the safety boundary conditions of the BMS system;
and 2.3) obtaining the maximum and minimum direct current bus voltage temporary protection constant values of the PCS system according to the overvoltage and undervoltage protection constant values of the BMS system and using the maximum and minimum direct current bus voltage temporary protection constant values as the safety boundary conditions of the PCS system.
Optionally, the detailed steps of step 3) include:
3.1) reading primary system wiring information of the battery energy storage power station system;
3.2) determining whether the joint debugging type of the joint debugging test adopts a 'drag joint debugging' mode or a 'grid-connected joint debugging' mode according to the primary system wiring information, and skipping to execute the step 3.3 if the 'grid-connected joint debugging' mode is adopted); if the mode of 'drag and drag joint debugging' is adopted, skipping to execute the step 3.4);
3.3) generating a required grid-connected joint debugging test step according to an energy storage unit grid-connected process, wherein the energy storage unit grid-connected process comprises a system state confirmation stage before test, a no-load impact two-winding dry-type transformer stage, a battery stack grid-connected stage, an energy storage converter start-stop test stage and an energy storage unit grid-connected test stage; skipping to execute the step 4);
and 3.4) automatically matching the joint debugging unit according to the set debugging unit range, generating a required 'drag joint debugging' test flow, and skipping to execute the step 4).
Optionally, the detailed step of automatically matching the joint debugging unit according to the set debugging unit range in step 3.4) includes:
3.4.1) determining the type of the 'twin drag tone', and jumping to execute the step 3.4.2 if the type is in a 'one-to-one' mode); if the type is in a one-to-many mode, skipping to execute the step 3.4.3); the one-to-one mode refers to that two energy storage converters are connected, one of the two energy storage converters works in a voltage source mode, and the other energy storage converter works in a power control mode, the one-to-many mode refers to that a plurality of energy storage converters are connected in parallel, one of the energy storage converters works in the voltage source mode, and the rest of the energy storage converters all work in the power control mode;
3.4.2) setting a joint debugging unit to work in a voltage source mode, wherein the voltage source mode is a constant-frequency and constant-voltage mode, and the energy storage converter outputs alternating-current voltage with constant amplitude and frequency in the constant-frequency and constant-voltage mode; setting another joint debugging unit to work in a power control mode, wherein the energy storage converter outputs constant active power and reactive power in the power control mode; finishing;
3.4.3) setting a joint debugging unit to work in a voltage source mode, wherein the voltage source mode is specifically a constant-frequency constant-voltage mode, and the energy storage converter outputs alternating-current voltage with constant amplitude and frequency in the constant-frequency constant-voltage mode; setting other united debugging sets to work in a power control mode, wherein the energy storage and current transformation output constant active power and reactive power in the power control mode; and (6) ending.
Optionally, the detailed steps of step 4) include:
4.1) reading the joint debugging test flow and the safe operation boundary conditions of the joint debugging test, and reading the state of a joint debugging switch in the battery energy storage power station system in real time;
4.2) judging whether the switch action is normal according to the joint debugging switch state and the switch state corresponding to different steps of the joint debugging test flow, if the switch action is normal, skipping to execute the next switch action, otherwise, generating and outputting corresponding alarm information;
4.3) reading the electric quantity of the direct current side and the alternating current side of the PCS;
4.4) acquiring charge and discharge power, charge and discharge time and cell stack voltage through alternating current and direct current side electric quantity operation, comparing the charge and discharge power, the charge and discharge time and the cell stack voltage with a safe operation boundary condition of a joint debugging test to judge whether the joint debugging system meets the safe operation boundary, and if the safe operation boundary is met, skipping to execute the step 4.1) circularly reading the switch state of the joint debugging system and entering the next monitoring period; otherwise, if the judgment result is 'no', generating and outputting corresponding alarm information.
The invention also provides a joint debugging test system for a battery energy storage power station system, which comprises a computer device, wherein the computer device is programmed to execute the steps of the joint debugging test method for the battery energy storage power station system, or a storage medium of the computer device is stored with a computer program which is programmed to execute the joint debugging test method for the battery energy storage power station system.
The present invention also provides a computer readable storage medium having stored thereon a computer program programmed to execute the aforementioned joint debugging test method for a battery energy storage power station system of the present invention.
Compared with the prior art, the invention has the following advantages:
the invention can realize the joint debugging test of the battery energy storage power station system, can estimate the battery characteristics, the initial state, the environmental parameters and other factors through the safe boundary condition to determine the safe operation boundary required to be met by the debugging test, and can effectively improve the safety of equipment in the joint debugging test; the debugging process automatic generation module automatically generates a debugging test system structure and a corresponding debugging process according to the system primary wiring information, so that the debugging process can be effectively standardized, and the debugging efficiency is improved; through the real-time monitoring of the test state real-time monitoring module on the joint debugging test, the potential dangerous situation in the test process can be effectively controlled, the efficiency and the safety of the construction and debugging of the energy storage power station can be effectively improved, and the safety and the reliability of the battery energy storage power station are guaranteed.
Drawings
FIG. 1 is a schematic diagram of a basic flow of a method according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart of generating boundary conditions in the embodiment of the present invention.
Fig. 3 is a schematic flow chart of a joint debugging test procedure in the embodiment of the present invention.
Fig. 4 is a schematic flow chart of performing a test procedure and monitoring a switch state according to an embodiment of the present invention.
Fig. 5 is a "one-to-one" wiring example in the embodiment of the present invention.
Fig. 6 is an example of a "one-to-many" connection in an embodiment of the present invention.
Fig. 7 is a schematic diagram of a basic frame structure of a system according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.
It should be understood that the following examples are only for illustrating the present invention, but not for limiting the scope of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the implementation steps of the joint debugging test method for the battery energy storage power station system in this embodiment include:
1) determining a safe operation boundary condition of the battery stack;
2) determining safety boundary conditions of a BMS system and a PCS system by using the safety operation boundary conditions of the cell stack;
3) a test flow step of matching the joint debugging unit to determine a joint debugging range and generate joint debugging;
4) and sequentially executing the test flow steps, monitoring the switch state information in the executing process, and sending an alarm signal when the switch state information is not matched with the safe operation boundary conditions of the battery stack or the safe boundary conditions of the BMS system and the PCS system.
As shown in fig. 2, the detailed steps of determining the safe operation boundary conditions of the stack in step 1) include:
1.1) reading battery design parameters and parameter measurement precision information of a BMS system and a PCS system, wherein the battery design parameters comprise battery and PCS system design parameter values (including rated voltage, alternating voltage rated frequency, rated current and rated capacity), battery state of charge parameters and field environment parameters (including cell temperature and cell open-circuit voltage);
1.2) obtaining a relation curve cluster of the open-circuit voltage and the SOC of the battery cell under the specified environmental parameters according to the read battery design parameters;
1.3) comparing the acquired cell open-circuit voltage of the installation site with the relation curve cluster, and estimating the open-circuit voltage and the state of charge (SOC) of the single cell;
1.4) estimating the open-circuit voltage and the SOC of the whole battery stack according to the open-circuit voltage and the SOC of the single battery cell;
1.5) determining the boundary conditions of the open-circuit voltage and the SOC of the whole cell stack according to the parameter measurement accuracy of the BMS system and the PCS system to serve as the boundary conditions of the safe operation of the cell stack.
In this embodiment, the expression of the function of the open-circuit voltage and the state of charge SOC of the entire cell stack estimated in step 1.4) is as shown in formula (1);
in the formula (1), SsocIs the SOC state of the cell stack, Bsoc_iThe open-circuit voltage and the state of charge SOC of each ith monomer cell, n is the number of the monomer cells, C is the rated capacity of the monomer cellstotalIs the rated capacity of the entire stack.
In this embodiment, the boundary conditions for determining the open-circuit voltage and the state of charge SOC of the entire cell stack in step 1.5) include that the lower boundary is (10% + x%), and the upper boundary is (90% -x%), where x% is the parameter measurement accuracy of the BMS system and the PCS system.
As shown in fig. 2, the detailed steps of step 2) include:
2.1) obtaining the chargeable and dischargeable capacity of the cell stack according to the integral open-circuit voltage, the SOC (state of charge) and boundary conditions of the cell stack, using the chargeable and dischargeable capacity of the cell stack as power constraint of a cell stack charge-discharge test, and dividing the chargeable and dischargeable capacity of the cell stack by corresponding charge-discharge power to obtain time constraint of the cell stack charge-discharge test;
2.2) obtaining the corresponding maximum and minimum values of the open-circuit voltage of the battery by utilizing the power constraint and the duration constraint of the charge-discharge test of the battery stack, wherein the voltage values are respectively used as the fixed values of overvoltage and undervoltage protection of the BMS system and used as the safety boundary conditions of the BMS system;
and 2.3) obtaining the maximum and minimum direct current bus voltage temporary protection constant values of the PCS system according to the overvoltage and undervoltage protection constant values of the BMS system and using the maximum and minimum direct current bus voltage temporary protection constant values as the safety boundary conditions of the PCS system.
As shown in fig. 3, the detailed steps of step 3) include:
3.1) reading primary system wiring information of the battery energy storage power station system;
3.2) determining whether the joint debugging type of the joint debugging test adopts a 'drag joint debugging' mode or a 'grid-connected joint debugging' mode according to the primary system wiring information, and skipping to execute the step 3.3 if the 'grid-connected joint debugging' mode is adopted); if the mode of 'drag and drag joint debugging' is adopted, skipping to execute the step 3.4);
3.3) generating a required grid-connected joint debugging test step according to an energy storage unit grid-connected process, wherein the energy storage unit grid-connected process comprises a system state confirmation stage before test, a no-load impact two-winding dry-type transformer stage, a battery stack grid-connected stage, an energy storage converter start-stop test stage and an energy storage unit grid-connected test stage; skipping to execute the step 4); the generation process of the required grid-connected joint debugging test step is mainly determined according to the requirements of different test stages, if the system state before the test is confirmed, the related equipment state to be detected is automatically generated, and if the no-load impact two-winding dry-type transformer is in a stage, the switch action sequence is determined according to a main wiring diagram of the system, and the like, and different test processes can be generated according to different requirements;
and 3.4) automatically matching the joint debugging unit according to the set debugging unit range, generating a required 'drag joint debugging' test flow, and skipping to execute the step 4).
In this embodiment, the detailed step of automatically matching the joint debugging unit according to the set debugging unit range in step 3.4) includes:
3.4.1) determining the type of the 'twin drag tone', and jumping to execute the step 3.4.2 if the type is in a 'one-to-one' mode); if the type is in a one-to-many mode, skipping to execute the step 3.4.3); the one-to-one mode refers to that two energy storage converters are connected, one of the two energy storage converters works in a voltage source mode, and the other energy storage converter works in a power control mode, the one-to-many mode refers to that a plurality of energy storage converters are connected in parallel, one of the energy storage converters works in the voltage source mode, and the rest of the energy storage converters all work in the power control mode;
3.4.2) setting a joint debugging unit to work in a voltage source mode, wherein the voltage source mode is a constant-frequency and constant-voltage mode, and the energy storage converter outputs alternating-current voltage with constant amplitude and frequency in the constant-frequency and constant-voltage mode; setting another joint debugging unit to work in a power control mode, wherein the energy storage converter outputs constant active power and reactive power in the power control mode; finishing;
3.4.3) setting a joint debugging unit to work in a voltage source mode, wherein the voltage source mode is specifically a constant-frequency constant-voltage mode, and the energy storage converter outputs alternating-current voltage with constant amplitude and frequency in the constant-frequency constant-voltage mode; setting other united debugging sets to work in a power control mode, wherein the energy storage and current transformation output constant active power and reactive power in the power control mode; and (6) ending.
To further describe the working principle of automatically matching the joint debugging unit according to the set debugging unit range in detail, the process of automatically matching the joint debugging unit according to the set debugging unit range by using the "twin-trailed joint debugging" test of a certain energy storage power station will be listed in detail below. In order to generate the test procedure of "twin-trawling" the primary wiring diagram of the energy storage power station is read, taking a power station with four energy storage units as an example, where each energy storage unit includes two sets of PCS systems, a battery stack and a BMS system corresponding to the battery stack, and the primary wiring is as shown in fig. 5. According to the different modes of the "twin trawling combined modulation", the combined modulation unit matching unit 21 can match the units participating in the "twin trawling combined modulation" according to the principle of "one-to-one" (so-called "one-to-one", i.e. two energy storage converters are connected, one of them works in a voltage source mode, and the other works in a power control mode) or "one-to-many" (so-called "one-to-many", i.e. a plurality of energy storage converters are connected in parallel, one works in a voltage source mode, and the other works in a power control mode).
Fig. 4 and 5 show examples of "twin drag joint debugging" unit combinations of "one-to-one" and "one-to-one", respectively. As shown in fig. 4, in the "one-to-one" twin-trawling "unit connection, in this embodiment, the VSC1-1 is set to operate in the VF mode (i.e., the constant-frequency constant-voltage mode in which the energy storage converter outputs ac voltage with constant amplitude and frequency), and the VSC2-1 operates in the PQ mode (i.e., the constant-power control mode in which the energy storage converter outputs constant active power and constant frequencyReactive power). As shown in fig. 5, in the unit wiring of the "one-to-many" twin-drag simultaneous dispatching ", VSC is set in the present embodiment1-1Operating in VF mode, VSC2-1To VSC4-2Operating in the PQ mode.
Taking "one-to-one" shown in fig. 4 as an example, after outputting a corresponding "pair-to-drag joint debugging" system wiring mode, a specific debugging step is generated according to a system main wiring and an equipment number, wherein the debugging step specifically comprises: (I) a system state confirmation stage before the test (the stage mainly ensures that the determined state of the relevant unit equipment meets the joint debugging test); (II) an energy storage converter no-load starting stage (the stage mainly comprises that an energy storage unit AC side switch participating in joint regulation is disconnected, a DC side is connected to a battery stack, and the energy storage converter realizes no-load starting); (III) the energy storage converter is provided with a transformer in a no-load starting stage (the stage mainly determines the joint debugging units and corresponding main wiring, and the energy storage converter works in a VF mode to carry out no-load impact on the transformer at the AC side of each unit); (IV) a start-stop test stage of the twin-towed system (in the stage, the working modes of relevant units are required to be set respectively, relevant equipment is sequentially accessed into the joint debugging system according to the test flow and the equipment number according to the determination of the joint debugging units and the corresponding main wiring, and the start-stop test of the whole system is realized); and (V) a function test stage of the joint debugging system (the test stage is consistent with the wiring topology of the previous stage, and after each device is connected into the system according to the test process, the charging and discharging test of the energy storage unit is started, and the test of the related system of the energy storage unit is realized at the same time).
As shown in fig. 6, the detailed steps of step 4) include:
4.1) reading the joint debugging test flow and the safe operation boundary conditions of the joint debugging test, and reading the state of a joint debugging switch in the battery energy storage power station system in real time;
4.2) judging whether the switch action is normal according to the joint debugging switch state and the switch state corresponding to different steps of the joint debugging test flow, if the switch action is normal, skipping to execute the next switch action, otherwise, generating and outputting corresponding alarm information;
4.3) reading the electric quantity of the direct current side and the alternating current side of the PCS;
4.4) acquiring charge and discharge power, charge and discharge time and cell stack voltage through alternating current and direct current side electric quantity operation, comparing the charge and discharge power, the charge and discharge time and the cell stack voltage with a safe operation boundary condition of a joint debugging test to judge whether the joint debugging system meets the safe operation boundary, and if the safe operation boundary is met, skipping to execute the step 4.1) circularly reading the switch state of the joint debugging system and entering the next monitoring period; otherwise, if the judgment result is 'no', generating and outputting corresponding alarm information.
In this embodiment, the alarm information that can be output in the test state is specifically shown in table 1.
Table 1: and the alarm information table can output the test state.
In addition, the present embodiment further provides a joint debugging test system for a battery energy storage power station system, which includes a computer device programmed to execute the steps of the joint debugging test method for the battery energy storage power station system of the present embodiment, or a storage medium of the computer device having a computer program stored thereon programmed to execute the joint debugging test method for the battery energy storage power station system of the present embodiment.
The embodiment also provides a system completely corresponding to the joint debugging test method for the battery energy storage power station system, and the steps of the joint debugging test method for the battery energy storage power station system are respectively realized through different program units. As shown in fig. 7, the core program modules of the joint debugging test system for the battery energy storage power station system in this embodiment include a safety boundary condition intelligent estimation module 1, a debugging process automatic generation module 2, and a test state real-time monitoring module 3, and data or information interaction is performed between the program modules and with the outside through a data storage unit 4 and a human-computer interaction unit 5. The intelligent safe boundary condition estimation module 1 is internally provided with a battery operation boundary condition estimation unit and a PCS operation boundary condition estimation unit and is used for calculating the safe operation boundary condition of the joint debugging test; the debugging flow automatic generation module 2 is internally provided with an automatic joint debugging test flow generation unit and an automatic joint debugging unit matching unit and is used for generating a debugging flow of a joint debugging test; the test state real-time monitoring module 3 is internally provided with a switch element monitoring unit, a PCS and battery state monitoring unit and an intelligent alarm unit and is used for monitoring the state of equipment in debugging in real time and realizing intelligent alarm; the data storage unit 4 is used for storing input data of the three modules and the human-computer interaction unit 5; the man-machine interaction unit 5 is used for realizing the interaction between the test personnel and the support system. The system comprises three core modules: the intelligent safety boundary condition estimation module 1 intelligently calculates an operation boundary corresponding to a joint debugging test by acquiring information such as test environment parameters, equipment parameters, battery factory data and the like; the debugging flow automatic generation module 2 utilizes a primary wiring diagram and power of the battery energy storage power station to convert the primary wiring diagram and the power into a set system electrical wiring diagram, a battery pile energy storage unit electrical wiring diagram and a test boundary condition intelligent estimation module to output results to automatically generate an energy storage unit debugging test participation unit and a test flow; the test state real-time monitoring module 3 prevents the joint debugging test from exceeding a related protection boundary by monitoring the alternating current/direct current electric quantity, the switching state and the battery stack state in the joint debugging test in real time. Through the system, the debugging progress of the construction of the energy storage power station on the power grid side can be accelerated, and the debugging risk is reduced.
In this embodiment, the intelligent safety margin condition estimation module 1 includes a battery operation safety margin estimation unit 11 and a PCS operation margin estimation unit 12 for calculating the battery test operation safety margin condition. When the battery safety boundary estimation device is used, the input end of the battery operation safety boundary estimation unit 11 is connected with the data storage unit 4 and used for reading a battery and PCS design parameter value, a battery charge state parameter and a field environment parameter, and a BMS system and PCS system measurement precision parameter; the output end of the battery operation safety boundary estimation unit 11 is respectively connected with the PCS operation boundary estimation unit 12 and the data storage unit 4, the first output end is used for outputting the charge-discharge power and time constraint information of the battery stack to the PCS operation boundary estimation unit 12, and the second output end is used for storing the calculated BMS temporary protection fixed value to the data storage unit 4; the PCS operation boundary estimation unit 12 has an input terminal connected to the battery operation safety boundary estimation unit 11 for reading the stack charge-discharge boundary limit condition, and an output terminal connected to the data storage unit 4 for storing the PCS system temporary protection setting value to the data storage unit 4.
In this embodiment, the debugging process automatic generation module 2 includes an associated debugging unit matching unit 21 for determining an associated debugging range and a test process automatic generation unit 22 for determining a debugging step. In use, the input end of the joint debugging unit matching unit 21 is connected with the data storage unit 4 and used for reading the primary system wiring diagram of the energy storage station and the states of the battery compartments stored in the data storage unit 4; the output end is connected with the test flow automatic generation unit 22 and used for transmitting the range of the joint debugging unit to the test flow automatic generation unit 22; the input end of the test flow automatic generation unit 22 is connected with the joint debugging unit matching unit 21 and used for reading the range of the joint debugging unit; the output end is connected with the data storage unit 4 and used for storing the automatically generated test flow into the data storage unit 4.
In this embodiment, the test state real-time monitoring module 3 includes a switching element monitoring unit 31 for monitoring a switching state in the joint debugging system, a PCS and battery state detecting unit 32 for monitoring states of a PCS and a battery stack, and an intelligent warning unit 33 for sending a warning signal according to an abnormal state of the joint debugging system. In use, the input end of the switch element monitoring unit 31 is connected with the data storage unit 4 and used for reading the switch number and state information in the joint debugging system and the joint debugging test flow information; the output end of the switching element monitoring unit 31 is connected to the intelligent warning unit 33, and is used for transmitting the abnormal state of the switch in the joint debugging system to the intelligent warning unit 33. The input end of the PCS and battery state monitoring unit 32 is connected with the data storage unit 4 and used for reading the safe operation boundary conditions of the joint debugging test and the alternating current and direct current electric quantity in the joint debugging system; the output end of the PCS and battery state monitoring unit 32 is connected with the intelligent alarm unit 33, and the information processed by the AC/DC electric quantity and the safe operation boundary conditions of the joint debugging test are transmitted to the intelligent alarm unit 33; the intelligent warning unit 33 has a first input terminal connected to the switching element monitoring unit 31 and a second input terminal connected to the PCS and battery state monitoring unit 32. Through the two input information, the intelligent warning unit 33 determines whether the joint debugging system is in a normal working state. If the abnormal state exists, the intelligent warning unit 33 will send out corresponding warning information to protect the safety of the devices in the joint debugging system, and the corresponding warning information will be stored in the data storage unit 4 through the output end of the intelligent warning unit 33. In this embodiment, the data storage unit 4 is mainly used for storing data such as information input by the human-computer interaction unit 5, factory parameters of the battery and the PCS, battery operation safety boundary information, temporary protection fixed values of the PCS and BMS systems, a primary connection diagram of the energy storage battery, debugging flow information, switch state information, information of the ac/dc power amount of the joint debugging system, and alarm information.
In this embodiment, the human-computer interaction unit 5 is mainly used to support interaction between the system and a debugging person, such as joint debugging mode selection, partial data entry, and an alarm information display lamp.
The system can effectively estimate the boundary condition of the joint debugging test according to the equipment state through the intelligent safe boundary condition estimation module 1, and provides analysis guidance before the test for the joint debugging; the debugging flow automatic generation module 2 is utilized to automatically generate debugging steps according to a joint debugging mode, so that the workload of debugging personnel is reduced; through test state real-time supervision module 3, can effectively realize the control to the experimental full flow of joint debugging, prevent that human error from leading to the debugging risk to take place, guarantee debugging equipment safety. The invention realizes the system joint debugging work of auxiliary debugging personnel on the energy storage units in the battery energy storage power station, can effectively improve the debugging level of engineering personnel on the energy storage power station, and can effectively shorten the debugging period of a newly-built battery energy storage power station.
In addition, the present embodiment also provides a computer readable storage medium, which stores thereon a computer program programmed to execute the aforementioned joint debugging test method for the battery energy storage power station system of the present embodiment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will 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 of the embodiments of the present invention.
Claims (8)
1. A joint debugging test method for a battery energy storage power station system is characterized by comprising the following implementation steps:
1) determining a safe operation boundary condition of the battery stack;
2) determining safety boundary conditions of a BMS system and a PCS system by using the safety operation boundary conditions of the cell stack;
3) a test flow step of matching the joint debugging unit to determine a joint debugging range and generate joint debugging;
4) the method comprises the following steps of sequentially executing test flow steps, monitoring switch state information in the executing process, and sending an alarm signal when the switch state information is not matched with the safe operation boundary conditions of a battery stack or the safe boundary conditions of a BMS system and a PCS system;
the detailed steps of the step 2) comprise:
2.1) obtaining the chargeable and dischargeable capacity of the cell stack according to the integral open-circuit voltage, the SOC (state of charge) and boundary conditions of the cell stack, using the chargeable and dischargeable capacity of the cell stack as power constraint of a cell stack charge-discharge test, and dividing the chargeable and dischargeable capacity of the cell stack by corresponding charge-discharge power to obtain time constraint of the cell stack charge-discharge test;
2.2) obtaining the corresponding maximum and minimum values of the open-circuit voltage of the battery by utilizing the power constraint and the duration constraint of the charge-discharge test of the battery stack, and taking the maximum and minimum values of the open-circuit voltage of the battery as the fixed values of overvoltage and undervoltage protection of the BMS system respectively and as the safety boundary conditions of the BMS system;
2.3) obtaining the maximum and minimum direct current bus voltage temporary protection fixed values of the PCS system according to the overvoltage and undervoltage protection fixed values of the BMS system and using the maximum and minimum direct current bus voltage temporary protection fixed values as the safety boundary conditions of the PCS system;
the detailed steps of the step 3) comprise:
3.1) reading primary system wiring information of the battery energy storage power station system;
3.2) determining whether the joint debugging type of the joint debugging test adopts a 'drag joint debugging' mode or a 'grid-connected joint debugging' mode according to the primary system wiring information, and skipping to execute the step 3.3 if the 'grid-connected joint debugging' mode is adopted); if the mode of 'drag and drag joint debugging' is adopted, skipping to execute the step 3.4);
3.3) generating a required grid-connected joint debugging test step according to an energy storage unit grid-connected process, wherein the energy storage unit grid-connected process comprises a system state confirmation stage before test, a no-load impact two-winding dry-type transformer stage, a battery stack grid-connected stage, an energy storage converter start-stop test stage and an energy storage unit grid-connected test stage; skipping to execute the step 4);
and 3.4) automatically matching the joint debugging unit according to the set debugging unit range, generating a required 'drag joint debugging' test flow, and skipping to execute the step 4).
2. The joint debugging test method for the battery energy storage power station system according to claim 1, wherein the detailed step of determining the safe operation boundary conditions of the battery stacks in the step 1) comprises the following steps:
1.1) reading battery design parameters and parameter measurement precision information of a BMS system and a PCS system, wherein the battery design parameters comprise battery and PCS system design parameter values, battery state of charge parameters and field environment parameters;
1.2) obtaining a relation curve cluster of the open-circuit voltage and the SOC of the battery cell under the specified environmental parameters according to the read battery design parameters;
1.3) comparing the acquired cell open-circuit voltage of the installation site with the relation curve cluster, and estimating the open-circuit voltage and the state of charge (SOC) of the single cell;
1.4) estimating the open-circuit voltage and the SOC of the whole battery stack according to the open-circuit voltage and the SOC of the single battery cell;
1.5) determining the boundary conditions of the open-circuit voltage and the SOC of the whole cell stack according to the parameter measurement accuracy of the BMS system and the PCS system to serve as the boundary conditions of the safe operation of the cell stack.
3. The joint debugging test method for the battery energy storage power station system according to claim 2, characterized in that the functional expression of the open-circuit voltage and the state of charge (SOC) of the whole battery stack in the step 1.4) is estimated as shown in the formula (1);
in the formula (1), SsocIs the SOC state of the cell stack, Bsoc_iThe open-circuit voltage and the state of charge SOC of the ith monomer battery cell, n is the number of the monomer battery cells, C is the rated capacity of the monomer battery cellstotalIs the rated capacity of the entire stack.
4. The joint debugging test method for the battery energy storage power station system according to claim 2, characterized in that the boundary conditions for determining the open-circuit voltage and the state of charge SOC of the whole battery stack in the step 1.5) comprise a lower boundary of (10% + x%) and an upper boundary of (90% -x%), wherein x% is the parameter measurement accuracy of the BMS system and the PCS system.
5. The joint debugging test method for the battery energy storage power station system according to claim 1, wherein the detailed step of automatically matching the joint debugging unit according to the set debugging unit range in the step 3.4) comprises the following steps:
3.4.1) determining the type of the 'twin drag tone', and jumping to execute the step 3.4.2 if the type is in a 'one-to-one' mode); if the type is in a one-to-many mode, skipping to execute the step 3.4.3); the one-to-one mode refers to that two energy storage converters are connected, one of the two energy storage converters works in a voltage source mode, and the other energy storage converter works in a power control mode, the one-to-many mode refers to that a plurality of energy storage converters are connected in parallel, one of the energy storage converters works in the voltage source mode, and the rest of the energy storage converters all work in the power control mode;
3.4.2) setting a joint debugging unit to work in a voltage source mode, wherein the voltage source mode is a constant-frequency and constant-voltage mode, and the energy storage converter outputs alternating-current voltage with constant amplitude and frequency in the constant-frequency and constant-voltage mode; setting another joint debugging unit to work in a power control mode, wherein the energy storage converter outputs constant active power and reactive power in the power control mode; finishing;
3.4.3) setting a joint debugging unit to work in a voltage source mode, wherein the voltage source mode is specifically a constant-frequency constant-voltage mode, and the energy storage converter outputs alternating-current voltage with constant amplitude and frequency in the constant-frequency constant-voltage mode; setting other united debugging sets to work in a power control mode, wherein the energy storage and current transformation output constant active power and reactive power in the power control mode; and (6) ending.
6. The joint debugging test method for the battery energy storage power station system according to claim 1, characterized in that the detailed steps of step 4) comprise:
4.1) reading the joint debugging test flow and the safe operation boundary conditions of the joint debugging test, and reading the state of a joint debugging switch in the battery energy storage power station system in real time;
4.2) judging whether the switch action is normal according to the joint debugging switch state and the switch state corresponding to different steps of the joint debugging test flow, if the switch action is normal, skipping to execute the next switch action, otherwise, generating and outputting corresponding alarm information;
4.3) reading the electric quantity of the direct current side and the alternating current side of the PCS;
4.4) acquiring charge and discharge power, charge and discharge time and cell stack voltage through alternating current and direct current side electric quantity operation, comparing the charge and discharge power, the charge and discharge time and the cell stack voltage with a safe operation boundary condition of a joint debugging test to judge whether the joint debugging system meets the safe operation boundary, and if the safe operation boundary is met, skipping to execute the step 4.1) circularly reading the switch state of the joint debugging system and entering the next monitoring period; otherwise, if the judgment result is 'no', generating and outputting corresponding alarm information.
7. The utility model provides a allies oneself with transfers test system for battery energy storage power station system, includes computer equipment, its characterized in that: the computer device is programmed to execute the steps of the joint debugging test method for the battery energy storage power station system in any one of claims 1-6, or the storage medium of the computer device is stored with a computer program programmed to execute the joint debugging test method for the battery energy storage power station system in any one of claims 1-6.
8. A computer-readable storage medium characterized by: the computer readable storage medium has stored thereon a computer program programmed to execute the joint debugging test method for the battery energy storage power station system according to any of claims 1-6.
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