CN211505719U - Test platform for energy storage bidirectional DC-DC converter - Google Patents
Test platform for energy storage bidirectional DC-DC converter Download PDFInfo
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- CN211505719U CN211505719U CN201921589784.0U CN201921589784U CN211505719U CN 211505719 U CN211505719 U CN 211505719U CN 201921589784 U CN201921589784 U CN 201921589784U CN 211505719 U CN211505719 U CN 211505719U
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Abstract
The embodiment of the utility model provides a test platform for two-way DC-DC converter of energy storage, including two-way DC-DC converter cabinet, first PWM rectifier cabinet, second PWM rectifier cabinet, control cabinet and input power, the control cabinet is through gathering the first test parameter of two-way DC-DC converter cabinet when step-down mode operation and obtaining first test result. In the test process, electric energy obtained by the second PWM rectifier cabinet from the input power supply passes through the bidirectional DC-DC converter cabinet and then is fed back to the input power supply through the first PWM rectifier cabinet, the obtained electric energy and the fed-back electric energy are mutually offset, the requirement on the capacity of a power grid is reduced, and the problem of examination and test on the high-capacity bidirectional DC-DC converter during voltage reduction under the condition of low loss is solved.
Description
Technical Field
The embodiment of the utility model provides a relate to electricity technical field, especially relate to a test platform for two-way DC-DC converter of energy storage.
Background
In recent years, bidirectional DC-DC converters have been widely used in the fields of new energy, aerospace, traffic, communication, industrial control, and the like, and in general, the bidirectional DC-DC converters are used in cooperation with energy storage devices.
Before the bidirectional DC-DC converter is put into application, the bidirectional DC-DC converter needs to be comprehensively examined and tested. Only under the condition of passing through comprehensive examination and test, the bidirectional DC-DC converter can be actually deployed so as to ensure that the bidirectional DC-DC converter can safely and reliably operate. For a low-power bidirectional DC-DC converter, the power supply and the load capacity can easily meet the requirements, so the examination and the test are relatively easy. However, for medium-and large-capacity bidirectional DC-DC converters (especially those with a power supply and load capacity above the Megawatt (MW) level), it is difficult to achieve a full-scale examination test of the bidirectional DC-DC converter due to the limitations of the power supply and the load capacity.
Under the condition of limited power supply and load capacity, the realization of examination test on the high-capacity bidirectional DC-DC converter in voltage reduction is a problem to be solved urgently by technical personnel in the field at present.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a test platform for two-way DC-DC converter of energy storage to overcome prior art under limited power and load capacity, can't realize the problem of the examination test to the two-way DC-DC converter of large capacity when stepping down.
On one hand, the embodiment of the utility model provides a test platform for two-way DC-DC converter of energy storage, including two-way DC-DC converter cabinet, first pulse width modulation PWM rectifier cabinet, second PWM rectifier cabinet, control cabinet and input power;
the input power supply is respectively connected with the first end of the first PWM rectifier cabinet and the first end of the second PWM rectifier cabinet;
the second end of the second PWM rectifier cabinet is connected with the first end of the bidirectional DC-DC converter cabinet, and the second end of the bidirectional DC-DC converter cabinet is connected with the second end of the first PWM rectifier cabinet;
the control console is respectively connected with the bidirectional DC-DC converter cabinet, the first PWM rectifier cabinet and the second PWM rectifier cabinet, and is used for controlling the bidirectional DC-DC converter cabinet to operate in a voltage reduction mode, controlling the second PWM rectifier cabinet to operate in a rectification mode, controlling the first PWM rectifier cabinet to operate in an inversion mode, and controlling the voltage of the second end of the first PWM rectifier cabinet to be maintained within a preset voltage range when the bidirectional DC-DC converter cabinet operates in the inversion mode;
the control console is further used for acquiring a first test parameter of the bidirectional DC-DC converter cabinet when the bidirectional DC-DC converter cabinet operates in a voltage reduction mode, and obtaining a first test result of the bidirectional DC-DC converter cabinet according to the first test parameter.
Optionally, the input power source includes a low-voltage power grid, a low-voltage power distribution cabinet and an isolation transformer, and the input power source is configured to provide power to the first PWM rectifier cabinet and the second PWM rectifier cabinet.
Optionally, the isolation transformer is a three-winding transformer;
the input power supply is connected with the first end of the first PWM rectifier cabinet and the first end of the second PWM rectifier cabinet respectively, and comprises:
and the first end of the first PWM rectifier cabinet and the first end of the second PWM rectifier cabinet are respectively connected with the two windings on the secondary side of the isolation transformer.
Optionally, the first test parameters include a first input instantaneous current, a first input instantaneous voltage, a first output instantaneous current, a first output instantaneous voltage, and a first ambient temperature, and the obtaining a first test result of the bidirectional DC-DC converter cabinet according to the first test parameters includes:
and obtaining a first test result of the bidirectional DC-DC converter cabinet according to the first input instantaneous current, the first input instantaneous voltage, the first output instantaneous current, the first output instantaneous voltage and the first environment temperature, wherein the first test result comprises a first power examination result, a first energy efficiency examination result, a first current-voltage ripple rate examination result, a first current-voltage error examination result and a first environment temperature examination result.
Optionally, the second PWM rectifier cabinet is configured to maintain the voltage value of the second end of the second PWM rectifier cabinet at a first constant voltage in a voltage-current dual closed-loop control manner.
Optionally, the bidirectional DC-DC converter cabinet is configured to maintain a current value of the second end of the bidirectional DC-DC converter cabinet at a first constant current through a current closed-loop control manner.
Optionally, the controlling the first PWM rectifier cabinet to operate in an inverter mode, and controlling the voltage of the second end of the first PWM rectifier cabinet to be maintained within a preset voltage range when the first PWM rectifier cabinet operates in the inverter mode includes:
controlling the first PWM rectifier cabinet to operate in an inversion mode, and controlling the voltage of the second end of the first PWM rectifier cabinet to be increased from a first voltage to a second voltage according to a preset capacitance value, and the collected current and the initial voltage of the second end of the first PWM rectifier cabinet when the first PWM rectifier cabinet operates in the inversion mode, wherein the first voltage and the second voltage are voltages within the preset voltage range;
the preset voltage range is set according to the test requirement.
Optionally, the first PWM rectifier cabinet is configured to maintain the voltage value of the second end of the first PWM rectifier cabinet within the preset voltage range in a voltage-current dual closed-loop control manner.
Optionally, the method further comprises:
the control console is further used for controlling the bidirectional DC-DC converter cabinet to operate in a boost mode, controlling the second PWM rectifier cabinet to operate in an inversion mode, controlling the first PWM rectifier cabinet to operate in a rectification mode, and controlling the voltage of the second end of the first PWM rectifier cabinet to be maintained within a preset voltage range when the bidirectional DC-DC converter cabinet operates in the rectification mode;
the control console is further used for acquiring second test parameters of the bidirectional DC-DC converter cabinet when the bidirectional DC-DC converter cabinet operates in a boost mode, and obtaining a second test result of the bidirectional DC-DC converter cabinet according to the second test parameters.
The embodiment of the utility model provides a test platform for two-way DC-DC converter of energy storage, including two-way DC-DC converter cabinet, first PWM rectifier cabinet, second PWM rectifier cabinet, control cabinet and input power supply, the control cabinet is through controlling two-way DC-DC converter cabinet, first PWM rectifier cabinet and second PWM rectifier cabinet are moved under different modes, gather the first test parameter of two-way DC-DC converter cabinet when step-down mode moves simultaneously to obtain the first test result of two-way DC-DC converter cabinet when step-down mode moves according to first test parameter. In the test process, electric energy obtained by the second PWM rectifier cabinet from the input power supply passes through the bidirectional DC-DC converter cabinet and then is fed back to the input power supply through the first PWM rectifier cabinet, the obtained electric energy and the fed-back electric energy are mutually offset, the requirement on the capacity of a power grid is reduced, and therefore the problem of examination and test of the high-capacity bidirectional DC-DC converter during voltage reduction under the condition of limited power supply and load capacity is solved.
Drawings
Fig. 1 is a schematic structural diagram of a test platform of a bidirectional DC-DC converter for energy storage according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another testing platform for a bidirectional DC-DC converter for energy storage according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a voltage-current double closed-loop control method according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a current closed-loop control method according to an embodiment of the present invention;
fig. 5 is a schematic flowchart illustrating a testing method of a bidirectional DC-DC converter for energy storage according to an embodiment of the present invention;
fig. 6 is a schematic flowchart of a testing method for a bidirectional DC-DC converter for energy storage according to an embodiment of the present invention.
Detailed Description
The test of the bidirectional DC-DC converter is mainly to collect operation parameters including but not limited to current, voltage, ambient temperature and the like in the boosting and reducing processes of the bidirectional DC-DC converter, based on the operation parameters, various test results in the boosting and reducing processes are obtained through formula conversion, the test results jointly form a comprehensive test of the bidirectional DC-DC converter, and the test results include but not limited to: the power assessment result, the energy efficiency assessment result, the current-voltage ripple rate assessment result, the current-voltage error assessment result, the environment temperature assessment result and the like.
The technical solutions of the embodiments of the present invention will be described below with reference to several specific embodiments.
Fig. 1 is the embodiment of the utility model provides a test platform structure sketch map for two-way DC-DC converter of energy storage, as shown in fig. 1, including two-way DC-DC converter cabinet 1, first PWM rectifier cabinet 2, second PWM rectifier cabinet 3, control cabinet 4 and input power source 5.
The input power source 5 is connected 31 to the first terminal 21 of the first PWM rectifier cabinet 2 and the first terminal of the second PWM rectifier cabinet 3, respectively.
The second end 32 of the second PWM rectifier cabinet 3 is connected to the first end 11 of the bidirectional DC-DC converter cabinet 1, and the second end 12 of the bidirectional DC-DC converter cabinet 1 is connected to the second end 22 of the first PWM rectifier cabinet 2.
The control console 4 is respectively connected with the bidirectional DC-DC converter cabinet 1, the first PWM rectifier cabinet 1 and the second PWM rectifier cabinet 1, and the control console 1 is configured to control the bidirectional DC-DC converter cabinet 1 to operate in a buck mode, control the second PWM rectifier cabinet 3 to operate in a rectification mode, control the first PWM rectifier cabinet 2 to operate in an inverter mode, and control the voltage of the second end 22 of the first PWM rectifier cabinet 2 to be maintained within a preset voltage range when operating in the inverter mode.
The console 4 is further configured to acquire a first test parameter of the bidirectional DC-DC converter cabinet 1 when operating in the buck mode, and obtain a first test result of the bidirectional DC-DC converter cabinet 1 according to the first test parameter.
In this embodiment, the input power source is an ac power source, which may be a low-voltage power grid, and the input voltage is 380V and the frequency is 50 Hz.
Wherein, the control cabinet control two-way DC-DC converter cabinet, second PWM rectifier cabinet and first PWM rectifier cabinet are respectively in step-down mode, rectification mode, contravariant mode operation, and the step-down mode means: converting the higher direct current voltage into a required lower direct current voltage mode, wherein the corresponding boosting mode is as follows: a mode for converting the lower DC voltage to a desired higher DC voltage; the operation of the bidirectional DC-DC converter in boost mode or buck mode is the basic function of the bidirectional DC-DC converter. The rectification mode is as follows: the process of converting alternating current into direct current is in a rectification mode; the inversion mode corresponds to the rectification mode, which means that the process of converting direct current into alternating current is the inversion mode.
The current flows as follows: firstly, the second PWM rectifier cabinet operates in a rectification mode, and converts alternating current of an input power supply into direct current with direct current voltage V1; secondly, the bidirectional DC-DC converter cabinet operates in a voltage reduction mode, and converts the direct-current voltage V1 into a voltage range X, wherein the voltage value in X is smaller than V1; and finally, the first PWM rectifier cabinet operates in an inversion mode, and converts the direct current into alternating current which is fed back to the alternating current power grid. The control console further obtains a first test result when the bidirectional DC-DC converter cabinet is subjected to voltage reduction by acquiring a first test parameter of the bidirectional DC-DC converter cabinet. Meanwhile, electric energy obtained by the second PWM rectifier cabinet from the input power supply passes through the bidirectional DC-DC converter cabinet and then is fed back to the input power supply through the first PWM rectifier cabinet, the obtained electric energy and the fed-back electric energy are mutually offset, and the requirement on the capacity of a power grid is reduced.
Fig. 2 is a schematic structural diagram of another testing platform for a bidirectional DC-DC converter for energy storage according to an embodiment of the present invention, as shown in fig. 2, including:
the input power source 5 comprises a low voltage grid 51, a low voltage distribution cabinet 52 and an isolation transformer 53, and the input power source 5 is used for supplying power to the first PWM rectifier cabinet 2 and the second PWM rectifier cabinet 3.
The low-voltage power distribution cabinet can protect a circuit and prevent personnel and equipment from being damaged by providing alternating current with 380V rated voltage and 50Hz frequency by a low-voltage power grid, for example, the 380V rated voltage and the 50Hz frequency of the low-voltage power distribution cabinet; the isolation transformer functions mainly in transformation and isolation, and the capacity of the isolation transformer is 500kVA for example.
Optionally, the isolation transformer is a three-winding transformer.
The input power source 5 is connected 31 to the first end 21 of the first PWM rectifier cabinet 2 and the first end of the second PWM rectifier cabinet 3, respectively, and includes:
the first terminal 21 of the first PWM rectifier cabinet 2 and the first terminal 31 of the second PWM rectifier cabinet 3 are connected to two windings on the secondary side of the isolation transformer 53, respectively.
Each phase of the three-winding transformer has three windings, and after one winding is connected with an alternating current power supply, the other two windings induce different electric potentials. In this embodiment, one winding of the three-winding transformer is connected to the ac power output by the low-voltage distribution cabinet, and the other two windings on the secondary side are respectively connected to the first end 21 of the first PWM rectifier cabinet 2 and the first end 31 of the second PWM rectifier cabinet 3.
Optionally, the bidirectional DC-DC converter cabinet includes a bidirectional DC-DC converter and a bidirectional DC-DC controller, the first PWM rectifier cabinet includes a first PWM rectifier and a first PWM controller, the second PWM rectifier cabinet includes a second PWM rectifier and a second PWM controller, and the console is connected to the bidirectional DC-DC converter cabinet, the first PWM rectifier cabinet and the second PWM rectifier cabinet, respectively, including:
the console is connected with the bidirectional DC-DC controller, the first PWM controller and the second PWM controller respectively.
Optionally, the console is a Personal Computer (PC), and the PC is connected to the bidirectional DC-DC converter cabinet, the first PWM rectifier cabinet and the second PWM rectifier cabinet respectively.
Optionally, the first test parameters include a first input instantaneous current, a first input instantaneous voltage, a first output instantaneous current, a first output instantaneous voltage, and a first ambient temperature, and the first test result of the bidirectional DC-DC converter cabinet 1 is obtained according to the first test parameters, including:
obtaining a first test result of the bidirectional DC-DC converter cabinet 1 according to the first input instantaneous current, the first input instantaneous voltage, the first output instantaneous current, the first output instantaneous voltage and the first environment temperature, wherein the first test result comprises a first power check result, a first energy efficiency check result, a first current-voltage ripple rate check result, a first current-voltage error check result and a first environment temperature check result.
In the above embodiment, the first power checking result in the first test result is calculated by the first output instantaneous voltage and the first output instantaneous current, and the calculation formula is as the following formula (1):
P(t)＝u(t)×i(t) (1)
during voltage reduction, P (t) is power at time t, u (t) is first output instantaneous voltage at time t, and i (t) is first output instantaneous current at time t.
The first energy efficiency assessment result in the first test result is calculated by the first input instantaneous voltage, the first input instantaneous current, the first output instantaneous voltage and the first output instantaneous current, and the calculation formula is as the following formula (2):
wherein E isinInputting electric energy for the bidirectional DC-DC converter cabinet; eoutFor outputting electric energy; i.e. i1、u1A first input instantaneous current and a first input instantaneous voltage, respectively; i.e. i2、u2A first output instantaneous current and a first output instantaneous voltage, respectively; t is t1、t2The start and end times of the test, respectively.
The first current-voltage ripple rate assessment result in the first test result is calculated by the first output instantaneous current and the first output instantaneous voltage, and the calculation formula is as the following formula (3):
wherein, the delta I% and the delta U% are respectively a current ripple rate and a voltage ripple rate; delta I and delta U are respectively a current ripple peak value and a voltage ripple peak value; i is0、U0Current average and voltage average, respectively, Δ I, Δ U, I0And U0Can be calculated by the first output instantaneous current and the first output instantaneous voltage.
The first current-voltage error checking result in the first test result is obtained by calculating a first output instantaneous current, a first output instantaneous voltage, a first constant current and a second constant voltage, and the calculation formula is as the following formula (4):
wherein, I1、I2Respectively a first output instantaneous current and a first constant current, U1、U2Respectively a first output instantaneous voltage and a second constant voltage.
The first environmental temperature assessment result in the first test result is obtained by the following method:
and obtaining an environment temperature assessment result during boosting according to the first environment temperature.
By the calculation method, a first test result of the bidirectional DC-DC converter cabinet in voltage reduction can be obtained.
Optionally, the second PWM rectifier cabinet 3 is configured to maintain the voltage value of the second terminal 32 of the second PWM rectifier cabinet 3 at the first constant voltage by a voltage-current dual closed loop control manner.
The voltage-current double closed loop control mode is used for controlling the voltage of the second end 42 of the second PWM rectifier cabinet 4 to be constant. Fig. 3 is a schematic circuit diagram of a voltage-current dual closed-loop control method according to an embodiment of the present invention, as shown in fig. 3, including: the control circuit comprises a current inner loop and a voltage outer loop, in which voltage outer loop Udc_refIs a preset first constant voltage, UdcFor the measured output voltage feedback value, the difference between the two is adjusted by Proportional Integral (PI) to obtain a charge-discharge current instruction i of the current inner loopsc_refAt electricityIn the in-stream ring, iscAnd comparing the modulation wave with a carrier triangular wave by a PWM modulation module to obtain a control pulse of the switching tube, and regulating the actual voltage value to be stabilized near a preset first constant voltage by the control pulse.
Optionally, the bidirectional DC-DC converter cabinet 1 is configured to maintain the current value at the second end 12 of the bidirectional DC-DC converter cabinet 1 at the first constant current through a current closed-loop control manner.
The current closed loop control mode is used for controlling the current of the second end 12 of the bidirectional DC-DC converter cabinet 1 to be constant. Fig. 4 is a schematic circuit diagram of a current closed-loop control method according to an embodiment of the present invention, as shown in fig. 4, including: the control circuit is a current inner loop isc_refIs a predetermined first constant current iscAnd comparing the modulation wave with a carrier triangular wave by a PWM modulation module to obtain a control pulse of the switching tube, and regulating the actual current value to be stabilized near a preset first current by the control pulse.
Optionally, controlling the first PWM rectifier cabinet 2 to operate in the inverter mode, and controlling the voltage of the second end 22 of the first PWM rectifier cabinet 2 to be maintained within a preset voltage range when operating in the inverter mode includes:
controlling the first PWM rectifier cabinet to operate in an inversion mode, and controlling the voltage of the second end of the first PWM rectifier cabinet to be increased from a first voltage to a second voltage according to a preset capacitance value, and the acquired current and initial voltage of the second end of the first PWM rectifier cabinet when the first PWM rectifier cabinet operates in the inversion mode, wherein the first voltage and the second voltage are voltages within a preset voltage range;
the preset voltage range is set according to the test requirement.
Generally, for testing a bidirectional DC-DC converter cabinet, a super capacitor needs to be connected to the rear end of the bidirectional DC-DC converter cabinet, and test parameters of the bidirectional DC-DC converter cabinet under different capacitance values are met by setting a plurality of capacitance values of the super capacitor. For example, when the capacitance value is C1, when the terminal voltage of the super capacitor needs to be tested to be charged and discharged within a preset range, the test parameters of the bidirectional DC-DC converter cabinet; and when the capacitance value is C2, testing the test parameters of the bidirectional DC-DC converter cabinet when the end voltage of the super capacitor is charged and discharged within a preset range.
In this embodiment, the first PWM rectifier cabinet is used to simulate the super capacitor, and the preset voltage of the second terminal of the first PWM rectifier cabinet is used to simulate the terminal voltage of the super capacitor. In this embodiment, by setting the capacitance C of the simulated super capacitor and the collected current and initial voltage of the second end of the first PWM rectifier cabinet, the preset voltage of the second end of the first PWM rectifier cabinet at the time t is calculated, and the calculation formula (5) is as follows:
wherein U (t) is a preset voltage of the second end at time t, namely the end voltage of the simulated super capacitor, C is a preset capacitance value of the simulated super capacitor, and U (t)0) In order to simulate the initial voltage of the super capacitor, i (t) is the collected current of the second end of the first PWM rectifier cabinet at the time t.
After the preset capacitance value of the simulated super capacitor is given, the voltage value (voltage value increase) of the terminal voltage of the super capacitor with the capacitance value during charging or discharging (charging in this case) along with the time increase can be calculated through the formula (5), and the terminal voltage change of the super capacitor is simulated by controlling the voltage of the second end of the first PWM rectifier cabinet to follow the voltage value along with the time increase in real time. And the terminal voltage of the analog super capacitor is within a preset range.
For example, given the capacitance value of the supercapacitor to be tested is C1, the test results of the bidirectional DC-DC converter cabinet are tested. The terminal voltage value of the super capacitor at the time t can be calculated and obtained to be U (t) through the simulated capacitance value C1 of the super capacitor and the lower limit X1 of the voltage range X of the collected current and the initial voltage of the second end of the first PWM rectifier cabinet, and the terminal voltage of the super capacitor is simulated to be increased to the upper limit X2 of the voltage range X along with the time through controlling the voltage of the second end of the first PWM rectifier cabinet to be U (t) in real time. At the moment, by collecting the test parameters of the bidirectional DC-DC converter cabinet, the test result of the bidirectional DC-DC converter cabinet is further obtained when the capacitance value of the super capacitor is C1 and the voltage variation range is X.
By the method, the super capacitor with any capacity can be simulated, and the test range is widened.
Optionally, the first PWM rectifier cabinet is configured to maintain the voltage value of the second end 22 of the first PWM rectifier cabinet 2 within a preset voltage range through a voltage-current dual closed-loop control manner.
The voltage-current double closed loop control mode is used for controlling the voltage of the second end 22 of the first PWM rectifier cabinet 2 to be constant within a preset voltage range. The voltage and current double closed loop control mode is the same as that of the second PWM rectifier cabinet, and the description is omitted.
Fig. 1 shows the bidirectional DC-DC converter cabinet 1 operating in a buck mode, the second PWM rectifier cabinet 3 operating in a rectification mode, and the first PWM rectifier cabinet 2 operating in an inverter mode, which in an alternative embodiment further includes:
the console 4 is further configured to control the bidirectional DC-DC converter cabinet 1 to operate in a boost mode, the second PWM rectifier cabinet 3 to operate in an inverter mode, the first PWM rectifier cabinet 2 to operate in a rectification mode, and the second end 22 of the first PWM rectifier cabinet 2 to maintain a voltage within a preset voltage range when operating in the rectification mode.
The control console is further used for acquiring second test parameters of the bidirectional DC-DC converter cabinet 1 when the bidirectional DC-DC converter cabinet 1 operates in the boost mode, and obtaining a second test result of the bidirectional DC-DC converter cabinet 1 according to the second test parameters.
The flowing process of the current is as follows: firstly, a first PWM rectifier cabinet operates in a rectification mode, alternating current of an input power supply is converted into direct current, and the direct current voltage is within a preset voltage range X; secondly, the bidirectional DC-DC converter cabinet operates in a boost mode, and the direct current voltage is increased to a direct current voltage V2, wherein V2 is larger than any voltage value in X; and finally, the second PWM rectifier cabinet operates in an inversion mode, and converts the direct current into alternating current and feeds the alternating current back to the alternating current power grid. And the control console further obtains a second test result when the bidirectional DC-DC converter cabinet is boosted by acquiring the test parameters of the bidirectional DC-DC converter cabinet. The embodiment combines the first test result to obtain a comprehensive test result of the bidirectional DC-DC converter cabinet during voltage boosting and voltage dropping.
According to the embodiment, through a test process, the comprehensive test results of the bidirectional DC-DC converter cabinet during voltage boosting and voltage reducing can be obtained, and the problem that the high-capacity bidirectional DC-DC converter is subjected to examination and test during voltage boosting and voltage reducing under the condition of limited power supply and load capacity is solved.
Optionally, the second test parameter includes a second input instantaneous current, a second input instantaneous voltage, a second output instantaneous current, a second output instantaneous voltage, and a second ambient temperature, and the second test result of the bidirectional DC-DC converter cabinet 1 is obtained according to the second test parameter, which includes:
and obtaining a second test result of the bidirectional DC-DC converter cabinet 1 according to the second input instantaneous current, the second input instantaneous voltage, the second output instantaneous current, the second output instantaneous voltage and the second ambient temperature, wherein the second test result includes but is not limited to a second power check result, a second energy efficiency check result, a second current-voltage ripple rate check result, a second current-voltage error check result and a second ambient temperature check result.
The second test parameters include a second input instantaneous current, a second input instantaneous voltage, a second output instantaneous current, a second output instantaneous voltage, and a second ambient temperature, which are different from the first test parameters in that: the first test parameter is a parameter collected for the bidirectional DC-DC converter cabinet operating in buck mode, and the second test parameter is a parameter collected for the bidirectional DC-DC converter cabinet operating in boost mode. Therefore, in the second test result, the second power check result, the second energy efficiency check result, the second current-voltage ripple rate check result, the second current-voltage error check result, and the second environment temperature check result are calculated from the second input instantaneous current, the second input instantaneous voltage, the second output instantaneous current, the second output instantaneous voltage, and the second environment temperature, and the calculation formula can calculate the second test parameter by replacing the second test parameter with the first test parameter in the first test result calculation formula, which is not described herein again.
And obtaining a second test result of the bidirectional DC-DC converter cabinet during boosting through a calculation method which is the same as the first test result.
Optionally, the second PWM rectifier cabinet 3 is configured to maintain the voltage value of the second terminal 32 of the second PWM rectifier cabinet 3 at a second constant voltage through a voltage-current dual closed-loop control manner.
The second constant voltage may be the same as or different from the first constant voltage.
Optionally, the bidirectional DC-DC converter cabinet 1 is configured to maintain the current value at the second end 12 of the bidirectional DC-DC converter cabinet 1 at the second constant current through a current closed-loop control manner.
The second constant current may be the same as or different from the first constant current.
Optionally, controlling the first PWM rectifier cabinet 2 to operate in the rectification mode, and controlling the voltage of the second end 22 of the first PWM rectifier cabinet 2 to be maintained within a preset voltage range when operating in the rectification mode includes:
controlling the first PWM rectifier cabinet to operate in a rectification mode, and controlling the voltage of the second end of the first PWM rectifier cabinet to be reduced from a second voltage to a first voltage according to a preset capacitance value, and the collected current and the initial voltage of the second end of the first PWM rectifier cabinet when the first PWM rectifier cabinet operates in the rectification mode, wherein the first voltage and the second voltage are voltages within a preset voltage range;
the preset voltage range is set according to the test requirement.
In this embodiment, when the first PWM rectifier cabinet operates in the inverter mode, the voltage of the second end of the first PWM rectifier cabinet is controlled to be maintained within the same preset voltage range, which is not described herein again. The difference is that the above process simulates a charging process of the super capacitor, the voltage at the second end of the first PWM rectifier cabinet increases with time, and the embodiment simulates a discharging process of the super capacitor, and the voltage at the second end of the first PWM rectifier cabinet decreases with time.
By the method, the super capacitor with any capacity can be simulated, and the test range is widened.
Optionally, the first PWM rectifier cabinet is configured to maintain the voltage value of the second end 22 of the first PWM rectifier cabinet 2 within a preset voltage range through a voltage-current dual closed-loop control manner.
The voltage-current double closed loop control mode is used for controlling the voltage of the second end 22 of the first PWM rectifier cabinet 2 to be constant within a preset voltage range. The voltage and current double closed loop control mode is the same as that of the second PWM rectifier cabinet, and the description is omitted.
Fig. 5 is a schematic flow chart of a testing method for a bidirectional DC-DC converter for energy storage provided in an embodiment of the present invention, as shown in fig. 5, the method is applied to a testing platform for a bidirectional DC-DC converter for energy storage, the platform includes a bidirectional DC-DC converter cabinet 1, a first PWM rectifier cabinet 2, a second PWM rectifier cabinet 3, a console 4 and an input power supply 5, and the method includes:
s101, the console 4 sends a first configuration instruction to the second PWM rectifier cabinet 3, and the first configuration instruction is used for configuring the second PWM rectifier cabinet 3 to operate in a rectification mode.
And S102, the console 4 sends a second configuration instruction to the bidirectional DC-DC converter cabinet 1, and the second configuration instruction is used for configuring the bidirectional DC-DC converter cabinet 1 to operate in a voltage reduction mode.
And S103, the console 4 sends a third configuration instruction to the first PWM rectifier cabinet 2, and the third configuration instruction is used for configuring the first PWM rectifier cabinet 2 to operate in an inversion mode.
And S104, the console 4 sends a first control instruction to the bidirectional DC-DC converter cabinet 1, and the first control instruction is used for indicating the bidirectional DC-DC converter cabinet 1 to start to operate.
And S105, the console 4 sends a second control instruction to the first PWM rectifier cabinet 2, and the second control instruction is used for indicating the first PWM rectifier cabinet 2 to start running.
S106, the console 4 sends a third control instruction to the second PWM rectifier cabinet 3, and the third control instruction is used for indicating the second PWM rectifier cabinet 3 to start running.
S107, the control console 4 collects first test parameters of the bidirectional DC-DC converter cabinet 1 when the bidirectional DC-DC converter cabinet 1 operates in a voltage reduction mode, and obtains a first test result of the bidirectional DC-DC converter cabinet 1 according to the first test parameters.
In step S101, the first configuration command instructs the second PWM rectifier cabinet to adopt a voltage-current dual closed-loop control mode, and a preset output voltage V1 is input to the voltage-current dual closed-loop control circuit, and after adjustment, the second end of the second PWM rectifier cabinet outputs a dc voltage with a voltage value of V1.
In step S103, a third configuration command instructs the first PWM rectifier cabinet to adopt a voltage-current double closed-loop control mode, and a preset output voltage is input to the voltage-current double closed-loop control circuit, after adjustment, the second end of the first PWM rectifier cabinet outputs a DC voltage, the voltage value is within a preset voltage range X, because the second end of the first PWM rectifier cabinet is connected to the second end of the bidirectional DC-DC converter, the voltage at the second end of the bidirectional DC-DC converter is also X, and the voltage values in X are both less than V1, that is, the bidirectional DC-DC converter operates in a buck mode.
Meanwhile, in step S102, the second configuration command instructs the bidirectional DC-DC converter cabinet to adopt a current closed-loop control mode, and a preset output current is input to the current double closed-loop control circuit, and after adjustment, the bidirectional DC-DC converter cabinet outputs a constant current, and the system power is controlled by the constant current and X.
The execution sequence of steps S101-S103 may be arbitrarily interchanged, or may be executed simultaneously.
The execution sequence of steps S104-S105 may not be sequential, or may be executed simultaneously.
The current flows as follows: firstly, the second PWM rectifier cabinet operates in a rectification mode, and converts alternating current of an input power supply into direct current with direct current voltage V1; secondly, the bidirectional DC-DC converter cabinet operates in a voltage reduction mode, and converts the direct-current voltage V1 into a voltage range X, wherein the voltage value in X is smaller than V1; and finally, the first PWM rectifier cabinet operates in an inversion mode, and converts the direct current into alternating current which is fed back to the alternating current power grid. The control console further obtains a first test result when the bidirectional DC-DC converter cabinet is subjected to voltage reduction by acquiring a first test parameter of the bidirectional DC-DC converter cabinet. Meanwhile, electric energy obtained by the second PWM rectifier cabinet from the input power supply passes through the bidirectional DC-DC converter cabinet and then is fed back to the input power supply through the first PWM rectifier cabinet, and the obtained electric energy and the fed-back electric energy are mutually offset.
Optionally, the first test parameters include a first input instantaneous current, a first input instantaneous voltage, a first output instantaneous current, a first output instantaneous voltage, and a first ambient temperature, and the first test result of the bidirectional DC-DC converter cabinet 1 is obtained according to the first test parameters, including:
obtaining a first test result of the bidirectional DC-DC converter cabinet 1 according to the first input instantaneous current, the first input instantaneous voltage, the first output instantaneous current, the first output instantaneous voltage and the first environment temperature, wherein the first test result comprises a first power check result, a first energy efficiency check result, a first current-voltage ripple rate check result, a first current-voltage error check result and a first environment temperature check result.
The calculation methods of the first power assessment result, the first energy efficiency assessment result, the first current-voltage ripple rate assessment result, the first current-voltage error assessment result, and the first environment temperature assessment result in the first test result are the same as those described in the first test result, and are not repeated herein.
By the calculation method of the first test result, the first test result of the bidirectional DC-DC converter cabinet in voltage reduction can be obtained.
Optionally, the first configuration instruction is further configured to configure the second PWM rectifier cabinet 3 to maintain the voltage value at the second end 32 of the second PWM rectifier cabinet 3 at the first constant voltage through a voltage-current dual closed-loop control manner.
The voltage-current double closed loop control mode is used for controlling the voltage of the second end 32 of the second PWM rectifier cabinet 3 to be constant. The voltage and current double closed loop control mode is the same as that of the second PWM rectifier cabinet, and the description is omitted.
Optionally, the second configuration instruction is further configured to configure the bidirectional DC-DC converter cabinet 1 to maintain the current value of the second end 12 of the bidirectional DC-DC converter cabinet 1 at the first constant current through a current closed-loop control manner.
The current closed loop control mode is used for controlling the current of the second end 12 of the bidirectional DC-DC converter cabinet 1 to be constant. The current closed-loop control mode is the same as that of the bidirectional DC-DC converter cabinet, and is not described again.
Optionally, before the console collects a first test parameter when the bidirectional DC-DC converter cabinet operates in the buck mode, the method further includes:
s108, the console sends a fourth control instruction to the first PWM rectifier cabinet, the fourth control instruction is used for controlling the first PWM rectifier cabinet to operate in an inversion mode, and controlling the voltage of the second end of the first PWM rectifier cabinet to be increased from the first voltage to the second voltage according to a preset capacitance value and the collected current and initial voltage of the second end of the first PWM rectifier cabinet when the first PWM rectifier cabinet operates in the inversion mode, and the first voltage and the second voltage are voltages within a preset voltage range;
the preset voltage range is set according to the test requirement.
In one possible implementation manner, the first voltage is a lowest voltage of a preset voltage range, the second voltage is a highest voltage of the preset voltage range, and the initial voltage is the first voltage.
In another possible implementation, the first voltage and the second voltage are within a preset voltage range but not at the end of the preset voltage range, and the initial voltage is the first voltage.
The principle of controlling the first PWM rectifier cabinet to operate in the inversion mode and controlling the voltage of the second end of the first PWM rectifier cabinet to be maintained within the preset voltage range when the first PWM rectifier cabinet operates in the inversion mode is the same as the above-mentioned principle, and details are not repeated herein.
Optionally, the first voltage is configured by a third configuration instruction, and the third configuration instruction is further configured to configure the first PWM rectifier cabinet to maintain the voltage value of the second terminal of the first PWM rectifier cabinet at the first voltage in a voltage-current dual closed-loop control manner.
The voltage-current double closed loop control mode is used for controlling the voltage of the second end 22 of the first PWM rectifier cabinet 2 to be constant at the first voltage. The voltage and current double closed loop control mode is the same as that of the second PWM rectifier cabinet, and the description is omitted.
Fig. 6 is a schematic flow chart of a testing method for a bidirectional DC-DC converter for energy storage according to another embodiment of the present invention, and on the basis of fig. 5, as shown in fig. 6, the method further includes:
s201, the console 4 sends a fourth configuration instruction to the first PWM rectifier cabinet 2, where the fourth configuration instruction is used to configure the first PWM rectifier cabinet 2 to operate in the rectification mode.
S202, the console 4 sends a fifth configuration instruction to the bidirectional DC-DC converter cabinet 1, and the fifth configuration instruction is used for configuring the bidirectional DC-DC converter cabinet 1 to operate in a boost mode.
S203, the console 4 sends a sixth configuration instruction to the second PWM rectifier cabinet 3, where the sixth configuration instruction is used to configure the second PWM rectifier cabinet 3 to operate in the inverter mode.
And S204, the console 4 sends a fifth control instruction to the bidirectional DC-DC converter cabinet 1, and the fifth control instruction is used for indicating the bidirectional DC-DC converter cabinet 1 to start to operate.
And S205, the console 4 sends a sixth control instruction to the second PWM rectifier cabinet 3, and the sixth control instruction is used for indicating the second PWM rectifier cabinet 3 to start running.
S206, the console 4 sends a seventh control instruction to the first PWM rectifier cabinet 2, where the seventh control instruction is used to instruct the first PWM rectifier cabinet 2 to start operation.
And S207, the console 4 acquires a second test parameter of the bidirectional DC-DC converter cabinet 1 when the bidirectional DC-DC converter cabinet 1 operates in the boost mode, and a second test result of the bidirectional DC-DC converter cabinet 1 is obtained according to the second test parameter.
In step S201, the fourth configuration command instructs the first PWM rectifier cabinet to adopt a voltage-current dual closed-loop control mode, and input a preset output voltage to the voltage-current dual closed-loop control circuit, and after adjustment, the second end of the second PWM rectifier cabinet outputs a dc voltage, where the voltage value is within the preset voltage range X.
In step S203, the sixth configuration command instructs the second PWM rectifier cabinet to adopt a voltage-current double closed loop control mode, and a preset output voltage is input to the voltage-current double closed loop control circuit, and after adjustment, the second PWM rectifier cabinet outputs a DC voltage V2, and since the second PWM rectifier cabinet is connected to the second end of the bidirectional DC-DC converter, the voltage at the second end of the bidirectional DC-DC converter is also V2, and V2 is greater than any voltage value of X, that is, the bidirectional DC-DC converter operates in a boost mode.
Meanwhile, in step S202, the fifth configuration command instructs the bidirectional DC-DC converter cabinet to adopt a current closed-loop control mode, and a preset output current is input to the current double closed-loop control circuit, and after adjustment, the bidirectional DC-DC converter cabinet outputs a constant current, and the system power is controlled by the constant current and X.
The execution sequence of steps S201 to S203 may be arbitrarily interchanged, or may be executed simultaneously.
The execution sequence of steps S204-S205 may not be sequential, or may be executed simultaneously.
The flowing process of the current is as follows: firstly, a first PWM rectifier cabinet operates in a rectification mode, alternating current of an input power supply is converted into direct current, and the direct current voltage is within a preset voltage range X; secondly, the bidirectional DC-DC converter cabinet operates in a boost mode, and the direct current voltage is increased to a direct current voltage V2, wherein V2 is larger than any voltage value in X; and finally, the second PWM rectifier cabinet operates in an inversion mode, and converts the direct current into alternating current and feeds the alternating current back to the alternating current power grid. And the control console further obtains a second test result when the bidirectional DC-DC converter cabinet is boosted by acquiring the test parameters of the bidirectional DC-DC converter cabinet. The embodiment combines the first test result to obtain a comprehensive test result of the bidirectional DC-DC converter cabinet during voltage boosting and voltage dropping.
According to the embodiment, through a test process, the comprehensive test results of the bidirectional DC-DC converter cabinet during voltage boosting and voltage reducing can be obtained, and the problem that the high-capacity bidirectional DC-DC converter is subjected to examination and test during voltage boosting and voltage reducing under the condition of limited power supply and load capacity is solved.
Optionally, the second test parameter includes a second input instantaneous current, a second input instantaneous voltage, a second output instantaneous current, a second output instantaneous voltage, and a second ambient temperature, and the second test result of the bidirectional DC-DC converter cabinet 1 is obtained according to the second test parameter, which includes:
and obtaining a second test result of the bidirectional DC-DC converter cabinet 1 according to the second input instantaneous current, the second input instantaneous voltage, the second output instantaneous current, the second output instantaneous voltage and the second ambient temperature, wherein the second test result includes but is not limited to a second power check result, a second energy efficiency check result, a second current-voltage ripple rate check result, a second current-voltage error check result and a second ambient temperature check result.
The second test parameters include a second input instantaneous current, a second input instantaneous voltage, a second output instantaneous current, a second output instantaneous voltage, and a second ambient temperature, which are different from the first test parameters in that: the first test parameter is a parameter collected for the bidirectional DC-DC converter cabinet operating in buck mode, and the second test parameter is a parameter collected for the bidirectional DC-DC converter cabinet operating in boost mode. Therefore, in the second test result, the second power check result, the second energy efficiency check result, the second current-voltage ripple rate check result, the second current-voltage error check result, and the second environment temperature check result are calculated from the second input instantaneous current, the second input instantaneous voltage, the second output instantaneous current, the second output instantaneous voltage, and the second environment temperature, and the calculation formula can calculate the second test parameter by replacing the second test parameter with the first test parameter in the first test result calculation formula, which is not described herein again.
And obtaining a second test result of the bidirectional DC-DC converter cabinet during boosting through a calculation method which is the same as the first test result.
Optionally, the second PWM rectifier cabinet 3 is configured to maintain the voltage value of the second terminal 32 of the second PWM rectifier cabinet 3 at a second constant voltage through a voltage-current dual closed-loop control manner.
The second constant voltage may be the same as or different from the first constant voltage.
Optionally, the bidirectional DC-DC converter cabinet 1 is configured to maintain the current value at the second end 12 of the bidirectional DC-DC converter cabinet 1 at the second constant current through a current closed-loop control manner.
The second constant current may be the same as or different from the first constant current.
Optionally, before the console collects a second test parameter when the bidirectional DC-DC converter cabinet operates in the boost mode, the method further includes:
s208, the console sends an eighth control instruction to the first PWM rectifier cabinet, wherein the eighth control instruction is used for controlling the first PWM rectifier cabinet to operate in a rectification mode, and controlling the voltage of the second end of the first PWM rectifier cabinet to be reduced from the second voltage to the first voltage according to a preset capacitance value, and the collected current and the initial voltage of the second end of the first PWM rectifier cabinet when the first PWM rectifier cabinet operates in the rectification mode, and the first voltage and the second voltage are voltages within a preset voltage range;
the preset voltage range is set according to the test requirement.
In one possible implementation manner, the first voltage is a lowest voltage of a preset voltage range, the second voltage is a highest voltage of the preset voltage range, and the initial voltage is the second voltage.
In another possible implementation, the first voltage and the second voltage are within a preset voltage range but not at the end of the preset voltage range, and the initial voltage is the second voltage.
In this embodiment, when the first PWM rectifier cabinet operates in the inverter mode, the voltage of the second end of the first PWM rectifier cabinet is controlled to be maintained within the same preset voltage range, which is not described herein again. The difference is that the above process simulates a charging process of the super capacitor, the voltage at the second end of the first PWM rectifier cabinet increases with time, and the embodiment simulates a discharging process of the super capacitor, and the voltage at the second end of the first PWM rectifier cabinet decreases with time.
Optionally, the second voltage is configured by a fourth configuration instruction, and the fourth configuration instruction is further configured to configure the first PWM rectifier cabinet to maintain the voltage value of the second end of the first PWM rectifier cabinet at the second voltage in a voltage-current dual closed-loop control manner.
The voltage-current double closed loop control mode is used for controlling the voltage of the second end 22 of the first PWM rectifier cabinet 2 to be constant at a second voltage. The voltage and current double closed loop control mode is the same as that of the second PWM rectifier cabinet, and the description is omitted.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (9)
1. A test platform for a bidirectional DC-DC converter for energy storage is characterized in that:
the bidirectional DC-DC converter comprises a bidirectional DC-DC converter cabinet, a first pulse width modulation rectifier cabinet, a second pulse width modulation rectifier cabinet, a control console and an input power supply;
the input power supply is respectively connected with the first end of the first pulse width modulation rectifier cabinet and the first end of the second pulse width modulation rectifier cabinet;
the second end of the second PWM rectifier cabinet is connected with the first end of the bidirectional DC-DC converter cabinet, and the second end of the bidirectional DC-DC converter cabinet is connected with the second end of the first PWM rectifier cabinet;
the control console is respectively connected with the bidirectional DC-DC converter cabinet, the first pulse width modulation rectifier cabinet and the second pulse width modulation rectifier cabinet, and is used for controlling the bidirectional DC-DC converter cabinet to operate in a voltage reduction mode, controlling the second pulse width modulation rectifier cabinet to operate in a rectification mode, controlling the first pulse width modulation rectifier cabinet to operate in an inversion mode, and controlling the voltage of the second end of the first pulse width modulation rectifier cabinet to be maintained within a preset voltage range when the bidirectional DC-DC converter cabinet operates in the inversion mode;
the control console is further used for acquiring a first test parameter of the bidirectional DC-DC converter cabinet when the bidirectional DC-DC converter cabinet operates in a voltage reduction mode, and obtaining a first test result of the bidirectional DC-DC converter cabinet according to the first test parameter.
2. The test platform of claim 1,
the input power supply comprises a low-voltage power grid, a low-voltage power distribution cabinet and an isolation transformer, and is used for supplying power to the first pulse width modulation rectifier cabinet and the second pulse width modulation rectifier cabinet.
3. The test platform of claim 2, wherein the isolation transformer is a three-winding transformer;
the input power supply is respectively connected with the first end of the first pulse width modulation rectifier cabinet and the first end of the second pulse width modulation rectifier cabinet, and comprises:
and the first end of the first pulse width modulation rectifier cabinet and the first end of the second pulse width modulation rectifier cabinet are respectively connected with two windings on the secondary side of the isolation transformer.
4. The test platform of claim 1, wherein the first test parameters include a first input instantaneous current, a first input instantaneous voltage, a first output instantaneous current, a first output instantaneous voltage, and a first ambient temperature, and wherein obtaining a first test result of the bidirectional DC-DC converter cabinet according to the first test parameters comprises:
and obtaining a first test result of the bidirectional DC-DC converter cabinet according to the first input instantaneous current, the first input instantaneous voltage, the first output instantaneous current, the first output instantaneous voltage and the first environment temperature, wherein the first test result comprises a first power examination result, a first energy efficiency examination result, a first current-voltage ripple rate examination result, a first current-voltage error examination result and a first environment temperature examination result.
5. The test platform of claim 1,
and the second pulse width modulation rectifier cabinet is used for maintaining the voltage value of the second end of the second pulse width modulation rectifier cabinet at a first constant voltage in a voltage and current double closed-loop control mode.
6. The test platform of claim 1,
the bidirectional DC-DC converter cabinet is used for maintaining the current value of the second end of the bidirectional DC-DC converter cabinet at a first constant current in a current closed-loop control mode.
7. The test platform of claim 1, wherein the controlling the first pwm rectifier cabinet to operate in an inverter mode and the controlling the voltage at the second end of the first pwm rectifier cabinet to maintain within a preset voltage range when operating in the inverter mode comprises:
controlling the first PWM rectifier cabinet to operate in an inversion mode, and controlling the voltage of the second end of the first PWM rectifier cabinet to be increased from a first voltage to a second voltage according to a preset capacitance value, and the collected current and the initial voltage of the second end of the first PWM rectifier cabinet when the first PWM rectifier cabinet operates in the inversion mode, wherein the first voltage and the second voltage are voltages within a preset voltage range;
the preset voltage range is set according to the test requirement.
8. The test platform of claim 7,
the first PWM rectifier cabinet is used for maintaining the voltage value of the second end of the first PWM rectifier cabinet within the preset voltage range in a voltage and current double closed-loop control mode.
9. The test platform of any one of claims 1-8, further comprising:
the control console is further used for controlling the bidirectional DC-DC converter cabinet to operate in a boosting mode, controlling the second pulse width modulation rectifier cabinet to operate in an inversion mode, controlling the first pulse width modulation rectifier cabinet to operate in a rectification mode, and controlling the voltage of the second end of the first pulse width modulation rectifier cabinet to be maintained within a preset voltage range when the bidirectional DC-DC converter cabinet operates in the rectification mode;
the control console is further used for acquiring second test parameters of the bidirectional DC-DC converter cabinet when the bidirectional DC-DC converter cabinet operates in a boost mode, and obtaining a second test result of the bidirectional DC-DC converter cabinet according to the second test parameters.
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| CN112540245A (en) * | 2019-09-23 | 2021-03-23 | 北京千驷驭电气有限公司 | Test platform and test method for energy storage bidirectional DC-DC converter |
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