CN118017575A - Debugging circuit and method of cascade high-voltage direct-hanging energy storage system - Google Patents
Debugging circuit and method of cascade high-voltage direct-hanging energy storage system Download PDFInfo
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Abstract
The application discloses a debugging circuit and method of a cascade high-voltage direct-hanging energy storage system, wherein the method comprises the following steps: externally connecting various testing devices on a high-voltage direct-hanging energy storage system to be debugged; based on the test signals, control instructions and low-voltage debugging parameters input to the energy storage system, carrying out multiple tests of a low-voltage debugging stage on the energy storage converter subsystem, wherein the tests comprise low-voltage control logic tests based on related components in a debugging circuit of the cascade high-voltage direct-hanging energy storage system; after the low-voltage debugging stage is completed, performing multiple tests on the high-voltage debugging stage of the energy storage converter subsystem based on a control instruction and high-voltage debugging parameters input to the energy storage system; acquiring two sets of energy storage systems which finish a low-voltage debugging stage and a high-voltage debugging stage, and carrying out high-current inspection and debugging on the two sets of energy storage systems based on a pair-by-pair mode. The method improves the efficiency and the safety of debugging the cascade high-voltage direct-hanging energy storage system.
Description
Technical Field
The application relates to the technical field of energy storage equipment, in particular to a debugging circuit and method of a cascading type high-voltage direct-hanging energy storage system.
Background
With the development of energy storage technology, the cascade high-voltage direct-hanging energy storage technology has been widely applied to many scenes such as fire energy storage frequency modulation, new energy matched energy storage, power grid side energy storage, user side energy storage and the like by virtue of various technical advantages. In order to further build the application project of the high-capacity cascade high-voltage direct-hanging energy storage system, popularize and build a large-scale high-voltage cascade energy storage power station, ensure the high efficiency and high quality of the cascade high-voltage direct-hanging energy storage system product, and further optimize the debugging process of the cascade high-voltage direct-hanging energy storage system.
In the related art, the debugging scheme for the cascade high-voltage direct-hanging energy storage system mainly comprises the following two steps: first, focusing on the function test of the energy storage sub-module, when the energy storage sub-module of the high-voltage direct-hanging energy storage equipment is tested, a cascading full-bridge type structure is used for generating test current, the charge state and the voltage of the sub-module are regulated based on carrier phase-shifting modulation, and the test that the energy storage sub-module accords with the actual system operation working condition is completed. However, the method is only suitable for debugging a single power unit, cannot be suitable for checking the whole system level, and has low debugging efficiency.
Secondly, a debugging method for simulating the battery is adopted, different power supply scenes are adapted by constructing different electric connection modes, and the complete machine test of the high-voltage cascade energy storage converter under the condition of no battery cluster is realized. For example, a test system comprising n isolated DC/DC power modules is constructed to realize a bidirectional DC/DC conversion function. However, although the debugging method can simulate the actual working condition of the energy storage system, the newly-added testing equipment greatly improves the debugging cost and the debugging risk, and the method cannot be directly used for testing in the complete set of the energy storage system, so that various equipment faults are easy to occur, and the debugging progress is influenced.
Therefore, in the related art, the system-level in-plant debugging scheme for the cascade high-voltage direct-hanging energy storage system is still not mature enough, the debugging efficiency is low, and the debugging risk is high, so that the problem to be solved is urgent at present.
Disclosure of Invention
The object of the present application is to solve at least to some extent one of the above-mentioned technical problems.
Therefore, a first object of the present application is to provide a debug circuit of a cascaded high-voltage direct-hanging energy storage system. By using the circuit for debugging, the efficiency of debugging the cascade high-voltage direct-hanging energy storage system can be improved, and the comprehensiveness, safety and reliability of debugging are improved.
The second purpose of the application is to provide a debugging method of the cascade type high-voltage direct-hanging energy storage system.
A third object of the present application is to propose a non-transitory computer readable storage medium.
To achieve the above objective, an embodiment of a first aspect of the present application provides a debug circuit of a cascaded high-voltage direct-hanging energy storage system, each component in the debug circuit is a component of the high-voltage direct-hanging energy storage system to be debugged, the debug circuit includes three-phase branches, each phase branch includes: the device comprises a first high-voltage alternating current breaker, a second high-voltage alternating current breaker, a grounding disconnecting link, an alternating current bypass contactor, an alternating current soft start resistor, an alternating current reactor and a plurality of power unit chain links,
The second end of the first high-voltage alternating current breaker is connected with the first end of the second high-voltage alternating current breaker, and the second end of the second high-voltage alternating current breaker is respectively connected with the grounding disconnecting link, the alternating current bypass contactor and the first end of the alternating current soft start resistor;
The second end of the grounding disconnecting link is grounded, and the alternating current bypass contactor is connected with the second end of the alternating current soft start resistor and then connected with the first end of the alternating current reactor;
The power unit chain links in each phase branch are overlapped in series to form a power unit chain link string, the second end of the alternating current reactor is connected with the first end of the first power unit chain link in the power unit chain link string, and the second end of the last power unit chain link in each power unit chain link string is connected.
In addition, the debugging circuit of the cascade high-voltage direct-hanging energy storage system provided by the embodiment of the application has the following additional technical characteristics:
optionally, in some embodiments, the power unit link comprises: the full-bridge power device comprises 1 full-bridge power unit, a direct-current voltage-stabilizing capacitor, a voltage-equalizing resistor, a smoothing reactor, a first direct-current contactor, a second direct-current contactor, a pre-charging resistor and two isolating switches, wherein the two isolating switches are connected with an energy storage battery cluster unit.
Optionally, in some embodiments, the full bridge power unit includes 4 insulated gate bipolar transistor IGBTs and 4 diodes, each diode being antiparallel with a corresponding insulated gate bipolar transistor IGBT; and the first ends of the first high-voltage alternating current circuit breakers in each phase of branch circuit are respectively connected with corresponding in-plant high-voltage buses.
In order to achieve the above object, an embodiment of a second aspect of the present invention provides a method for debugging a cascaded high-voltage direct-hanging energy storage system, where the method is applied to a debugging circuit of the cascaded high-voltage direct-hanging energy storage system of the first aspect, and the method includes:
Externally connecting various testing devices on the high-voltage direct-hanging energy storage system to be debugged, so as to input corresponding testing signals when the energy storage converter subsystem of the high-voltage direct-hanging energy storage system is subjected to multi-stage debugging;
Performing multiple tests of a low-voltage debugging stage on the energy storage converter subsystem based on a test signal, a control instruction and a low-voltage debugging parameter which are input to the energy storage system, wherein the multiple tests of the low-voltage debugging stage comprise low-voltage control logic tests performed based on related components in a debugging circuit of the cascade high-voltage direct-hanging energy storage system;
After the low-voltage debugging phase is completed, performing multiple tests of the high-voltage debugging phase on the energy storage converter subsystem based on a control instruction and high-voltage debugging parameters input to an energy storage system, wherein the multiple tests of the high-voltage debugging phase comprise high-voltage control logic tests and low-power operation tests based on related components in the debugging circuit;
Acquiring two sets of energy storage systems which finish the low-voltage debugging stage and the high-voltage debugging stage, and carrying out high-current inspection and debugging on the two sets of energy storage systems based on a pair-by-pair mode.
In addition, the debugging method of the cascade high-voltage direct-hanging energy storage system provided by the embodiment of the application has the following additional technical characteristics:
Optionally, in some embodiments, the multiple checking of the low-voltage debug phase further comprises: voltage transformer inspection, hall inspection, current hardware quick-break protection inspection, travel switch inspection, optical fiber communication inspection and fault tripping inspection, wherein, voltage transformer inspection includes: detecting whether interphase resistance values of an outer wiring and an inner wiring of the voltage transformer meet requirements; and applying a preset alternating voltage signal to the wiring position on the inner side of the voltage transformer through the voltage output module, and detecting whether the three-phase voltage of the energy storage converter subsystem is a rated voltage value.
Optionally, in some embodiments, the low voltage control logic verification based on related components in a debug circuit of the cascaded high voltage direct-hang energy storage system includes: the isolating switch is controlled to be in an off state, the low-voltage debugging parameters are set on the energy storage system, a high-voltage cable connected to the system is disconnected, and the first high-voltage alternating current circuit breaker is switched to a working position; and after the energy storage system is reset, the energy storage system is controlled to enter a standby state, and working state switching conditions of the first direct current contactor, the second high-voltage alternating current breaker and the alternating current bypass contactor are detected.
Optionally, in some embodiments, the multiple checking of the high voltage debug phase further comprises: primary main loop wiring state inspection, mutual-inductor and hall sensor phase sequence inspection and uninterrupted power source state inspection, high voltage control logic inspection based on relevant subassembly in the debug circuit includes: closing a secondary power supply of the energy storage system, controlling the isolating switch to be in a closed state, setting the high-voltage debugging parameters on the energy storage system, and switching the first high-voltage alternating current circuit breaker to a working position; and after the energy storage system is reset, the energy storage system is controlled to enter a standby state, working state switching conditions of the first direct current contactor, the second high-voltage alternating current breaker and the alternating current bypass contactor are detected, and whether the three-phase voltage of the energy storage converter subsystem is a rated voltage value is detected.
Optionally, in some embodiments, the low power operation check includes: setting the energy storage system to operate in a short time with zero power, and gradually increasing the operation time until the energy storage system is in a stable operation state; and gradually increasing the output power of the energy storage system, and controlling the energy storage system to sequentially run for a preset time at a plurality of preset power points in a small power interval.
Optionally, in some embodiments, the performing high current verification commissioning of the two sets of energy storage systems in a pair-wise manner includes: the primary main loops of the two sets of energy storage systems are connected to the same section of high-voltage bus; accessing a current transformer of a second energy storage system to an energy storage converter subsystem of a first energy storage system to sample current, controlling the second energy storage system to operate in a conventional power control mode, and controlling the first energy storage system to operate in a reactive power compensation mode; and controlling the energy storage converter subsystem of the first energy storage system to start to run in a 0-power state, starting the second energy storage system, gradually increasing the reactive power of the second energy storage system in a stepwise increasing mode, and detecting the reactive power change condition and the working state of the first energy storage system.
To achieve the above object, an embodiment of a third aspect of the present invention provides a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements a method for debugging a cascaded high-voltage direct-hanging energy storage system according to any one of the embodiments of the second aspect.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects:
After the cascading high-voltage direct-hanging energy storage system is completed in a complete set, the debugging of the battery cluster subsystem is not involved, and the functional test of the high-voltage direct-hanging energy storage system can be completed by only sequentially carrying out various tests in a low-voltage debugging stage, a high-voltage debugging stage and a high-current debugging stage based on a debugging circuit built by the high-voltage direct-hanging energy storage system. Through the debugging in the three stages, the function of the cascade high-voltage direct-hanging energy storage system can be tested in all directions, the potential risk of the high-voltage direct-hanging energy storage system can be gradually checked through debugging in sequence according to the preset sequence, the loss caused by faults is reduced, and the debugging safety is enhanced. Meanwhile, different steps can be executed according to different debugging requirements, and the whole system is directly debugged, so that the debugging period is shortened. Therefore, the application improves the efficiency of debugging the cascade high-voltage direct-hanging energy storage system, improves the comprehensiveness, safety and reliability of debugging, can be suitable for various scenes and is easy to implement.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
Fig. 1 is a schematic structural diagram of a debug circuit of a cascaded high-voltage direct-hanging energy storage system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a power unit link according to an embodiment of the present application;
FIG. 3 is a flowchart of a method for debugging a cascade high-voltage direct-hanging energy storage system according to an embodiment of the present application;
Fig. 4 is a schematic diagram of a debugging method of a cascade high-voltage direct-hanging energy storage system according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
In the embodiment of the application, the high-capacity cascade high-voltage direct-hanging energy storage system adopts a cascade topological structure and a control algorithm, and each phase can be subjected to series phase shifting superposition by a plurality of H-bridge energy storage converter units (namely power unit chain links), so that the system can be directly connected with a 6kV/10kV/35kV power grid without a step-up transformer. Compared with the traditional low-voltage scheme, the single-machine power of the system is greatly improved, the rated output power range of the single-machine is 5 MW-50 MW, and the system is particularly suitable for high-voltage high-capacity energy storage application occasions such as power grid side energy storage peak regulation and frequency modulation power stations, thermal power unit combined AGC frequency modulation and new energy power station permeability improvement.
At present, a system-level factory debugging scheme for a cascading high-voltage direct-hanging energy storage system is not mature enough, a complete debugging scheme is lacked, the debugging efficiency is low, and the debugging risk is high. Therefore, the application provides a debugging method for a cascading type high-voltage direct-hanging energy storage system, when the energy storage system is completed in a complete set, the debugging of the battery system is not needed, and only logic test, sampling test, voltage test and current test are needed to complete the function inspection of the high-voltage direct-hanging energy storage system, and the debugging of the battery system can be used for standby according to project progress, so that the debugging efficiency is greatly improved, and the safe and reliable operation of the energy storage system is ensured.
The following describes a debugging circuit and a method of a cascading type high-voltage direct-hanging energy storage system according to an embodiment of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a debug circuit of a cascaded high-voltage direct-hanging energy storage system according to an embodiment of the present application, where each component in the debug circuit is a component of the high-voltage direct-hanging energy storage system to be debugged, and the debug circuit includes three-phase branches, each phase branch includes the same component and the connection modes of the components are the same, so, for simplifying the description, one branch in fig. 1 is selected for labeling and explanation.
As shown in fig. 1, each phase leg includes: the first high-voltage alternating current breaker QF 1, the second high-voltage alternating current breaker QF 2, the grounding switch K 1, the alternating current bypass contactor K 2, the alternating current soft start resistor R P, the alternating current reactor L 0 and the plurality of power unit links SM i, i=1, 2 … N, N are any positive integers. The hall element 10 is present on a certain connection line between the plurality of power unit links.
It should be noted that the high-voltage direct-hanging energy storage system (may be simply referred to as an energy storage system in the present application) itself includes a plurality of subsystems such as an energy storage converter (Power Conversion System, abbreviated as a PCS) subsystem, an energy storage battery subsystem, and a fire protection subsystem. The PCS subsystem is a power conversion and control core of the energy storage system, the application mainly aims at the part to be debugged, and the battery subsystem is regarded as a direct current source, and the debugging of the battery inside the battery cluster is not involved. And as described above, each phase of the energy storage system can be overlapped by serially shifting phase of a plurality of power unit links, so the application utilizes the above components in the energy storage system itself to build a main circuit for debugging the cascade high-voltage direct-hanging energy storage system shown in fig. 1, and the method for debugging the PCS subsystem can be executed by using the circuit.
With continued reference to fig. 1, in each leg, the second end of the first high voltage ac breaker QF 1 is connected to the first end of the second high voltage ac breaker QF 2, and the second end of the second high voltage ac breaker QF 2 is connected to the first ends of the ground knife K 1, the ac bypass contactor K 2, and the ac soft start resistor R P, respectively. The second end of the grounding switch K 1 is grounded, and after the AC bypass contactor K 2 is connected with the second end of the AC soft start resistor R P, the second end of the grounding switch K 1 is connected with the first end of the AC reactor L 0.
The plurality of power unit links in each phase leg are stacked in series to form a power unit link string, the second end of the ac reactor L 0 is connected to the first end of the first power unit link (i.e., SM 1) in the power unit link string in the current leg, and the second end of the last power unit link (i.e., SM N) in each power unit link string is connected. N is determined according to the actual parameters of the energy storage system.
In one embodiment of the application, as shown in FIG. 2, each power cell link comprises: the full-bridge power unit comprises 1 full-bridge power unit, a direct-current voltage stabilizing capacitor C 1, an M omega-level voltage equalizing resistor R m, a smoothing reactor L 1, a first direct-current contactor J 1, a second direct-current contactor J 2, a pre-charging resistor R 1 and two isolating switches K m.
The two isolating switches K m are connected with an energy storage battery cluster unit, and the energy storage battery cluster unit comprises a battery and a battery internal resistance R. The connection manner of the rest of the components in the power unit link is shown in fig. 2, and will not be described herein. Each full-bridge power unit consists of 4 full-control device Insulated Gate Bipolar Transistors (IGBTs) and diodes which are antiparallel with each IGBT, namely, the 4 Insulated Gate Bipolar Transistors (IGBTs) and the 4 diodes are divided into 4 groups, and the diodes in each group are antiparallel with the corresponding Insulated Gate Bipolar Transistors (IGBTs). V 0 and I 0 are the input voltage and input current, respectively, of the present link.
In one embodiment of the application, the circuit can be applied to in-plant commissioning of the high voltage direct-hang energy storage system prior to delivery, so that the circuit can be connected to an in-plant high voltage bus when power is supplied to the circuit. For example, as shown in fig. 1, the first end of the first ac high-voltage breaker QF 1 in each phase leg is connected to a corresponding high-voltage bus in the plant (i.e., a corresponding one of the three-phase high-voltage buses V sa、Vsb and V sc).
Therefore, the debugging circuit shown in fig. 1 can be regarded as a part of the high-voltage direct-hanging energy storage system based on the construction mode, and when the debugging circuit is used for debugging the high-voltage direct-hanging energy storage system, the state of related components in the circuit can be controlled, and the debugging can be performed by combining the modes of issuing control instructions, externally connecting test signals and the like.
In summary, the debugging circuit of the cascade high-voltage direct-hanging energy storage system can complete the functional test of the high-voltage direct-hanging energy storage system, can perform omnibearing test on the function of the cascade high-voltage direct-hanging energy storage system, and enhances the safety of debugging.
In order to more clearly illustrate a specific implementation process of debugging the cascade high-voltage direct-hanging energy storage system through the debugging circuit of the embodiment, a method for debugging the cascade high-voltage direct-hanging energy storage system provided by the embodiment of the application is used for describing in detail. The method is applied to the debugging circuit of the cascade high-voltage direct-hanging energy storage system in the embodiment, namely the debugging method of the cascade high-voltage direct-hanging energy storage system can control the debugging circuit in the implementation to realize the debugging function.
Fig. 3 is a flowchart of a method for debugging a cascade high-voltage direct-hanging energy storage system according to an embodiment of the present application, as shown in fig. 3, the method includes the following steps:
Step S301, a plurality of testing devices are externally connected to the high-voltage direct-hanging energy storage system to be debugged, so that corresponding testing signals are input when the energy storage converter subsystem of the high-voltage direct-hanging energy storage system is subjected to multi-stage debugging.
It should be noted that, as shown in fig. 4, the debugging method of the present application is mainly divided into three stages: the debugging process of the debugging method does not involve an energy storage battery cluster unit, can realize the test of the function of the whole set of energy storage converter, and can flexibly adjust test items in the debugging process according to actual debugging requirements.
Specifically, in the debugging process, external test signals are needed for some tests besides controlling the opening and closing of components such as a breaker and the like in the high-voltage direct-hanging energy storage system and issuing control instructions to the energy storage system. Therefore, before the debugging of each stage, various testing devices can be externally connected to the high-voltage direct-hanging energy storage system to be debugged at present, so that corresponding testing signals are input when the energy storage converter subsystem of the high-voltage direct-hanging energy storage system is debugged at different stages. For example, the external various testing devices may be a voltage output module, a current output module, various sensors, etc. to input a test voltage signal, a test current signal, etc. to the energy storage system during the low voltage debugging phase.
In one embodiment of the application, before debugging, the primary main loop of the energy storage system can be strictly checked, including connection, phase sequence, insulation, power supply and other states of equipment such as a switch cabinet, a starting cabinet, a split-phase container, a power unit chain link and the like of the energy storage system, wiring checking is performed on the secondary control loop, and downloading of a test program is completed.
Step S302, performing multiple tests of a low-voltage debugging stage on the energy storage converter subsystem based on test signals, control instructions and low-voltage debugging parameters input to the energy storage system, wherein the multiple tests of the low-voltage debugging stage comprise low-voltage control logic tests based on related components in a debugging circuit of the cascade high-voltage direct-hanging energy storage system.
Specifically, when the application is used for debugging, the low-voltage debugging stage is firstly carried out, and a plurality of tests can be sequentially carried out according to a preset sequence in the low-voltage debugging stage, for example, PCS main circuit test, control logic test, sampling test and the like can be realized. The low voltage debugging stage comprises the step of utilizing the debugging circuit of the cascade high voltage direct hanging energy storage system in the embodiment to carry out low voltage control logic test, controlling related components in the debugging circuit, and detecting state changes of other certain components to detect whether the low voltage control logic is normal or not.
The test signal input to the energy storage system may be a signal input to the energy storage system through the test device connected to the external device in the previous step, for example, a test voltage signal. The control instructions may be instructions sent to the energy storage system using a controller included in the PCS subsystem. The low-voltage debugging parameter can be a control parameter which is input to the energy storage system by utilizing a man-machine interaction interface of the energy storage system and used for detecting low-voltage control logic.
In one embodiment of the application, the multiple checks of the low voltage debug phase further comprise: voltage transformer inspection, hall inspection, current hardware quick-break protection inspection, travel switch inspection, optical fiber communication inspection and fault tripping inspection, and all the inspection are sequentially carried out in the low-voltage debugging stage according to the sequence. The various checks performed during the low voltage debug phase are described in detail below.
As an example, when the voltage transformer is tested, the method comprises the following steps: detecting whether interphase resistance values of an outer wiring and an inner wiring of the voltage transformer meet requirements; and applying a preset alternating voltage signal to the wiring position on the inner side of the voltage transformer through the voltage output module, and detecting whether the three-phase voltage of the energy storage converter subsystem is a rated voltage value.
Specifically, when a voltage transformer (PotentialTransformer, abbreviated as PT) is carried out, a circuit connected to the PT cabinet is disconnected, the inter-phase resistance value of the PT outer side wiring is measured through a multimeter resistor rail, and is normally close to 0 ohm, and the inter-phase resistance of the PT inner side wiring reaches more than 10 kiloohms. Then, using the voltage output module, three-phase AC57.7V ac voltage signals are added at the PT inner wiring, where both U AB、UBC and U CA should be able to be observed on the PCS display device as rated line voltage values.
In this example, when the hall test is performed, the current output module applies the current to the A, B and the hall element 10 of the three phases C of the PCS subsystem respectively, so that the phase sequence and the numerical value of the three phases of current are observed on the PCS display device correctly under normal conditions.
In this example, when the current hardware quick-break protection is performed, according to the parameter configuration of the sampling plate, the voltage or the current value triggering the hardware quick-break protection is directly applied to the secondary input side of the hall, and the sliding resistor is adjusted to a state of just triggering the protection.
When the travel switches contained in the container, the cabinet door and other equipment are checked, the travel switches of the container, the cabinet door and other equipment are connected in series, the state of the travel switches is monitored at the moment of the PCS subsystem, and if the door opening operation is executed in operation, the emergency stop protection of the PCS subsystem can be triggered.
When the optical fiber communication inspection is performed in the example, the energy storage converter and the power unit chain link are subjected to instant communication through the optical fiber, and the consistency of the optical fiber communication is ensured by a mode of pulling out and inserting the optical fiber head to confirm the state of the optical fiber.
When fault trip checking is performed: before formally debugging, the shutdown action of the PCS subsystem can be triggered when the fault is confirmed by simulating the fault, so that the safety of debugging operation is ensured.
In this example, the low voltage logic test is performed, comprising the steps of: the disconnecting switch is controlled to be in a disconnection state, low-voltage debugging parameters are set on the energy storage system, a high-voltage cable connected by the system is disconnected, and the first high-voltage alternating current circuit breaker is switched to a working position; and after the energy storage system is reset, the energy storage system is controlled to enter a standby state, and working state switching conditions of the first direct current contactor, the second high-voltage alternating current breaker and the alternating current bypass contactor are detected.
Specifically, firstly, the disconnecting switch Km is confirmed to be in an off state, low-voltage debugging parameters are set through a human-computer interaction interface of the system, the fact that the cascade high-voltage direct-hanging energy storage system is not connected to a high-voltage cable is confirmed, and QF 1 is set at a working position (namely a closing state). Then, after resetting the energy storage system, controlling the energy storage system to operate in a standby state, and when the energy storage system operates in the standby state according to the low-voltage debugging parameters, if the inspection result is normal, the switching conditions of the working states of all the components can be observed in sequence as follows: j 1 is closed, J 2 is closed, J 1 is opened, QF 2 is closed, K 2 is closed, and then a standby indicator light is lighted. Further, restarting operation, and observing that the energy storage system fan is started and the running indicator light is turned on;
And finally, stopping the machine through a stop button on the energy storage system after the low-voltage test is finished, and turning on a stop indicator lamp.
Thus, a low voltage debugging phase is completed, which is the basis for the subsequent high voltage debugging work.
Step S303, after the low voltage debugging phase is completed, performing multiple tests of the high voltage debugging phase on the energy storage converter subsystem based on the control instruction and the high voltage debugging parameter input to the energy storage system, wherein the multiple tests of the high voltage debugging phase comprise high voltage control logic tests and low power operation tests based on related components in the debugging circuit.
Specifically, after the low-voltage debugging stage is completed, the high-voltage debugging stage is entered, and multiple tests can be sequentially performed in the high-voltage debugging stage according to a preset sequence, for example, the voltage withstand test of the PCS main loop, the rated value verification of a system control strategy, the detection of the whole set of high-voltage control logic and the like can be realized. The high voltage debugging stage comprises high voltage control logic inspection by using the debugging circuit of the cascade type high voltage direct hanging energy storage system in the embodiment, and detecting whether the high voltage control logic is normal or not by controlling related components in the debugging circuit and detecting state changes of other certain components.
The mode of inputting the control instruction and the high-voltage debugging parameter into the energy storage system may refer to the mode of the low-voltage debugging stage in the above embodiment, and the implementation principle is the same, which is not repeated here.
In one embodiment of the application, the multiple checks of the high voltage debug phase further comprise: and after each inspection is sequentially performed in the high-voltage debugging stage according to the sequence, the high-voltage control logic inspection and the low-power operation inspection are performed. The following describes in detail the various tests performed during the high voltage commissioning phase.
As an example, primary main loop wiring verification is performed first, i.e., primary main loop wiring is carefully checked before high voltage commissioning is powered on, ensuring accurate wiring and reliable insulation. Then, the phase sequence of the PT, the current transformer (CurrentTransformer, CT for short) and the Hall sensor is checked and confirmed to be normal, and as the energy storage system needs to be connected with high voltage in the stage and needs to be controlled according to the electric quantity data sampled by the PT, the CT and the Hall sensor, whether the sensor can work normally or not is checked firstly so as to ensure the normal operation of the system.
In this example, when an Uninterruptible Power Supply (UPS) status is checked, it is confirmed that the UPS device is started and in an online inversion output state, and if the control power is completely lost during high-voltage operation, the energy storage device is damaged, and the UPS device is turned on to play a key role in the reliability of the overall operation of the energy storage device.
In this example, the high voltage control logic verification based on the relevant components in the debug circuitry includes: firstly closing a secondary power supply of the energy storage system, controlling the isolating switch to be in a closed state, setting the high-voltage debugging parameters on the energy storage system, and switching the first high-voltage alternating current circuit breaker to a working position; and then controlling the energy storage system to enter a standby state after being reset, detecting working state switching conditions of the first direct current contactor, the second high-voltage alternating current breaker and the alternating current bypass contactor, and detecting whether the three-phase voltage of the energy storage converter subsystem is a rated voltage value.
Specifically, the operation parameters of the energy storage system are set firstly, and the method specifically comprises the steps of checking and confirming that the secondary power supply of the energy storage system is completely closed, closing the isolating switch K m, setting the high-voltage operation parameters of the PCS subsystem through the man-machine interaction interface of the system, and setting the QF 1 at a working position (namely a closing state). Then, performing system self-checking in a standby state, specifically including resetting the energy storage system, controlling the energy storage system to operate in the standby state, and when the energy storage system operates in the standby state according to the high-voltage debugging parameters, if the checking result is normal, sequentially observing that the working state switching conditions of each component are as follows: j 1 on, J 2 on, J 1 off, QF 2 on, K 2 on, and the dc side capacitor voltage rises to a voltage value that does not control the current state. At this time, if the system checks normally, it should be able to observe that U AB、UBC and U CA are both rated line voltage values on the PCS display device. The "standby" indicator light then lights up.
In this example, the low power operation and the aging test are performed, including the steps of: firstly, setting an energy storage system to operate in a short time with zero power, and gradually increasing the operation time until the energy storage system is in a stable operation state; then, the output power of the energy storage system is gradually increased, and the energy storage system is controlled to sequentially operate at a plurality of preset power points in a small power interval for a preset time period.
Specifically, according to the controller included in the PCS subsystem, the entire energy storage system can be controlled to achieve different power outputs, and because the debugging process of the present application does not involve a battery, the energy storage system can be controlled to run in reactive power. When the test is specifically performed, the energy storage system is set to perform short-time operation with zero power, namely the operation duration is within a preset shorter duration, and the operation indicator lamp is detected to be turned on at the moment. Then, observing the state of the energy storage system under the short-time operation with zero power, and gradually increasing the operation time until the energy storage system can stably operate for a long time. Further, the output power of the energy storage system is gradually increased, and the output power is ensured to be low power below a preset threshold, for example, by increasing the inductive reactive power of the energy storage system, the energy storage system is operated for 5min at each power point of-500 kVar, -300kVar, 0, 300kVar, 500kVar and the like in a small power interval.
And finally, when the high-voltage debugging and inspection are finished, rapidly discharging the capacitor in the energy storage system by pressing an emergency stop button and adopting a low-voltage debugging method.
Thus, a high voltage debugging phase is completed, and the voltage withstanding and sampling control of the PCS subsystem are comprehensively checked in the debugging phase.
Step S304, two sets of energy storage systems which finish a low-voltage debugging stage and a high-voltage debugging stage are obtained, and high-current inspection and debugging are carried out on the two sets of energy storage systems based on a pair-by-pair mode.
Specifically, the high-current testing and debugging stage is entered after the high-voltage debugging stage is completed, and the high-current testing and debugging stage can only run in a small power range because the high-voltage debugging stage is limited by the load of the high-voltage bus in the factory, so that the high-current testing and debugging is performed in the step to test the high-current operation capability of the PCS subsystem, and the high-current operation capability of the PCS subsystem can meet the actual field operation working condition. The reactive power of the towing operation is checked by adopting the two sets of high-voltage direct-hanging energy storage systems in the debugging stage.
In one embodiment of the application, the method for carrying out high-current inspection and debugging on two sets of energy storage systems based on a pair-wise mode comprises the following steps: firstly, connecting primary main loops of two sets of energy storage systems to the same section of high-voltage bus; then, a current transformer of the second energy storage system is connected to an energy storage converter subsystem of the first energy storage system to sample current, the second energy storage system is controlled to operate in a conventional power control mode, and the first energy storage system is controlled to operate in a reactive power compensation mode; and then controlling the energy storage converter subsystem of the first energy storage system to start to operate in a 0-power state, starting the second energy storage system, gradually increasing the reactive power of the second energy storage system in a stepwise increasing mode, and detecting the reactive power change condition and the working state of the first energy storage system.
Specifically, in this embodiment, the primary main loop wiring inspection is performed first, that is, after the two sets of energy storage systems are debugged in the above two stages, the primary main loop is connected to the same section of high-voltage bus, so that the large-current opposite-dragging debugging can be performed. Then, the CT of the system No. 2 is confirmed to be connected to the system No.1 for sampling, namely, a CT current sampling signal of the PCS subsystem No. 2 is connected to the PCS subsystem of the system No.1, so that the PCS subsystem of the system No.1 performs compensation control. Setting debugging parameters of the two sets of energy storage systems, operating the PCS subsystem of the No. 2 system in a conventional power control mode, operating the PCS subsystem of the No.1 system in a reactive power compensation mode, and enabling the power of the No.1 system to follow the power of the No. 2 system.
Further, the running power is adjusted stepwise, and when the specific implementation is performed, the PCS subsystem of the No. 1 system is started first, and the PCS subsystem is controlled to run in a 0 power state. And starting the PCS subsystem of the No.2 system, setting the reactive power of the No.2 PCS subsystem to be 10% of rated reactive power as a step, and gradually increasing the reactive power to the rated reactive power for operation. In the control state, if the test is passed, the test result is that the reactive power of the PCS subsystem of the No. 1 system is increased along with the change of the No.2 system, and the states of the two sets of PCS subsystems are inductive and capacitive, and the two sets of PCS subsystems are in complementary working states.
And finally, after the large-current debugging is finished, gradually reducing the power of the PCS subsystem of the No. 2 system to 0, controlling the two sets of energy storage systems to stop, discharging the capacitors of the two sets of energy storage systems, and finishing the debugging.
Therefore, the PCS subsystem is controlled to operate in a high-current state through high-current inspection and debugging, and the whole system is inspected completely, so that the high-voltage direct-hanging energy storage system is ensured to have factory conditions.
Through the debugging in the three stages, the function of the cascade high-voltage direct-hanging energy storage system is tested in all directions, and the potential risk of the energy storage system can be further checked.
In summary, according to the method for debugging the cascade type high-voltage direct-hanging energy storage system, after the cascade type high-voltage direct-hanging energy storage system is completed, the debugging of the battery cluster subsystem is not involved, and based on a debugging circuit built by the high-voltage direct-hanging energy storage system, the functional test of the high-voltage direct-hanging energy storage system can be completed only by sequentially carrying out various tests in a low-voltage debugging stage, a high-voltage debugging stage and a high-current debugging stage. According to the method, through the debugging in the three stages, the functions of the cascade high-voltage direct-hanging energy storage system can be tested in all directions, the potential risks of the high-voltage direct-hanging energy storage system can be gradually checked through debugging in sequence according to the preset sequence, the loss caused by faults is reduced, and the debugging safety is enhanced. Meanwhile, different steps can be executed according to different debugging requirements, and the whole system is directly debugged, so that the debugging period is shortened. Therefore, the method improves the efficiency of debugging the cascade high-voltage direct-hanging energy storage system, improves the comprehensiveness, safety and reliability of debugging, can be suitable for various scenes and is easy to implement.
In order to achieve the foregoing embodiments, the present application further provides a non-transitory computer readable storage medium storing a computer program, where the computer program when executed by a processor implements a debugging method of a cascaded high-voltage direct-hanging energy storage system according to the foregoing embodiments of the present application.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In addition, in the description of the present application, the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (10)
1. The utility model provides a debugging circuit of energy storage system is hung to cascaded high voltage, its characterized in that, every subassembly in the debugging circuit is the high voltage that waits to debug directly hangs the energy storage system itself, the debugging circuit includes three-phase branch road, and every looks branch road includes: the device comprises a first high-voltage alternating current breaker, a second high-voltage alternating current breaker, a grounding disconnecting link, an alternating current bypass contactor, an alternating current soft start resistor, an alternating current reactor and a plurality of power unit chain links,
The second end of the first high-voltage alternating current breaker is connected with the first end of the second high-voltage alternating current breaker, and the second end of the second high-voltage alternating current breaker is respectively connected with the grounding disconnecting link, the alternating current bypass contactor and the first end of the alternating current soft start resistor;
The second end of the grounding disconnecting link is grounded, and the alternating current bypass contactor is connected with the second end of the alternating current soft start resistor and then connected with the first end of the alternating current reactor;
The power unit chain links in each phase branch are overlapped in series to form a power unit chain link string, the second end of the alternating current reactor is connected with the first end of the first power unit chain link in the power unit chain link string, and the second end of the last power unit chain link in each power unit chain link string is connected.
2. The circuit of claim 1, wherein the power cell link comprises: the full-bridge power unit comprises 1 full-bridge power unit, a direct-current voltage-stabilizing capacitor, a voltage-equalizing resistor, a smoothing reactor, a first direct-current contactor, a second direct-current contactor, a pre-charging resistor and two isolating switches,
The two isolating switches are connected with the energy storage battery cluster unit.
3. The circuit of claim 2, wherein the full bridge power cell comprises 4 insulated gate bipolar transistor IGBTs and 4 diodes, each diode being antiparallel with a corresponding insulated gate bipolar transistor IGBT;
and the first ends of the first high-voltage alternating current circuit breakers in each phase of branch circuit are respectively connected with corresponding in-plant high-voltage buses.
4. A method for debugging a cascade high-voltage direct-hanging energy storage system, which is applied to the debugging circuit of the cascade high-voltage direct-hanging energy storage system as claimed in any one of claims 1 to 3, and comprises the following steps:
Externally connecting various testing devices on the high-voltage direct-hanging energy storage system to be debugged, so as to input corresponding testing signals when the energy storage converter subsystem of the high-voltage direct-hanging energy storage system is subjected to multi-stage debugging;
Performing multiple tests of a low-voltage debugging stage on the energy storage converter subsystem based on a test signal, a control instruction and a low-voltage debugging parameter which are input to the energy storage system, wherein the multiple tests of the low-voltage debugging stage comprise low-voltage control logic tests performed based on related components in a debugging circuit of the cascade high-voltage direct-hanging energy storage system;
After the low-voltage debugging phase is completed, performing multiple tests of the high-voltage debugging phase on the energy storage converter subsystem based on a control instruction and high-voltage debugging parameters input to an energy storage system, wherein the multiple tests of the high-voltage debugging phase comprise high-voltage control logic tests and low-power operation tests based on related components in the debugging circuit;
Acquiring two sets of energy storage systems which finish the low-voltage debugging stage and the high-voltage debugging stage, and carrying out high-current inspection and debugging on the two sets of energy storage systems based on a pair-by-pair mode.
5. The method of claim 4, wherein the multiple checks of the low-voltage debug phase further comprise: voltage transformer inspection, hall inspection, current hardware quick-break protection inspection, travel switch inspection, optical fiber communication inspection and fault tripping inspection, wherein, voltage transformer inspection includes:
Detecting whether interphase resistance values of an outer wiring and an inner wiring of the voltage transformer meet requirements;
and applying a preset alternating voltage signal to the wiring position on the inner side of the voltage transformer through the voltage output module, and detecting whether the three-phase voltage of the energy storage converter subsystem is a rated voltage value.
6. The method of claim 4, wherein the low voltage control logic verification by the relevant component in the debug circuitry of the cascaded high voltage direct connect energy storage system comprises:
the isolating switch is controlled to be in an off state, the low-voltage debugging parameters are set on the energy storage system, a high-voltage cable connected to the system is disconnected, and the first high-voltage alternating current circuit breaker is switched to a working position;
and after the energy storage system is reset, the energy storage system is controlled to enter a standby state, and working state switching conditions of the first direct current contactor, the second high-voltage alternating current breaker and the alternating current bypass contactor are detected.
7. The method of claim 4, wherein the multiple verifications of the high pressure commissioning phase further comprise: primary main loop wiring state inspection, mutual-inductor and hall sensor phase sequence inspection and uninterrupted power source state inspection, high voltage control logic inspection based on relevant subassembly in the debug circuit includes:
Closing a secondary power supply of the energy storage system, controlling the isolating switch to be in a closed state, setting the high-voltage debugging parameters on the energy storage system, and switching the first high-voltage alternating current circuit breaker to a working position;
And after the energy storage system is reset, the energy storage system is controlled to enter a standby state, working state switching conditions of the first direct current contactor, the second high-voltage alternating current breaker and the alternating current bypass contactor are detected, and whether the three-phase voltage of the energy storage converter subsystem is a rated voltage value is detected.
8. The method of claim 7, wherein the low power operation check comprises:
Setting the energy storage system to operate in a short time with zero power, and gradually increasing the operation time until the energy storage system is in a stable operation state;
And gradually increasing the output power of the energy storage system, and controlling the energy storage system to sequentially run for a preset time at a plurality of preset power points in a small power interval.
9. The method of claim 4, wherein the performing high current verification commissioning of the two sets of energy storage systems based on a pair-wise approach comprises:
the primary main loops of the two sets of energy storage systems are connected to the same section of high-voltage bus;
Accessing a current transformer of a second energy storage system to an energy storage converter subsystem of a first energy storage system to sample current, controlling the second energy storage system to operate in a conventional power control mode, and controlling the first energy storage system to operate in a reactive power compensation mode;
And controlling the energy storage converter subsystem of the first energy storage system to start to run in a 0-power state, starting the second energy storage system, gradually increasing the reactive power of the second energy storage system in a stepwise increasing mode, and detecting the reactive power change condition and the working state of the first energy storage system.
10. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements a method of commissioning a cascaded high voltage direct-hang energy storage system according to any one of claims 4-9.
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