CN211785819U - Bidirectional DC-DC converter test platform - Google Patents
Bidirectional DC-DC converter test platform Download PDFInfo
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- CN211785819U CN211785819U CN201921589782.1U CN201921589782U CN211785819U CN 211785819 U CN211785819 U CN 211785819U CN 201921589782 U CN201921589782 U CN 201921589782U CN 211785819 U CN211785819 U CN 211785819U
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Abstract
The embodiment of the utility model provides a two-way DC-DC converter test platform, including first two-way DC-DC converter cabinet, the two-way DC-DC converter cabinet of second, first PWM rectifier cabinet, second PWM rectifier cabinet, control cabinet and input power. The control console acquires a first test parameter of the second bidirectional DC-DC converter cabinet and obtains a first test result, and acquires a second test parameter of the first bidirectional DC-DC converter cabinet and obtains a second test result. The electric energy obtained by the second PWM rectifier cabinet from the input power supply passes through the second bidirectional DC-DC converter cabinet and the first bidirectional DC-DC converter cabinet and 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, so that the examination test of the high-capacity bidirectional DC-DC converter during boosting or reducing is realized under the limited power supply and load capacity.
Description
Technical Field
The embodiment of the utility model provides a relate to electricity technical field, especially, relate to a two-way direct current-direct current (DC-DC) converter test platform.
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.
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 boosting or voltage reduction of a high-capacity bidirectional DC-DC converter is a problem to be solved urgently by the technical personnel in the field at present.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a two-way DC-DC converter test platform to overcome prior art under limited power and load capacity, can't realize the problem of the two-way DC-DC converter examination test of large capacity when stepping up or stepping down.
On the one hand, the embodiment of the utility model provides a two-way DC-DC converter test platform, including first two-way DC-DC converter cabinet, second 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 second bidirectional DC-DC converter cabinet, the second end of the second bidirectional DC-DC converter cabinet is connected with the first end of the first bidirectional DC-DC converter cabinet, and the second end of the first bidirectional DC-DC converter cabinet is connected with the second end of the first PWM rectifier cabinet;
the console is respectively connected with the first bidirectional DC-DC converter cabinet, the second bidirectional DC-DC converter cabinet, the first PWM rectifier cabinet and the second PWM rectifier cabinet, and is used for controlling the second bidirectional DC-DC converter cabinet to operate in a boost mode, the first bidirectional DC-DC converter cabinet to operate in a buck mode, the second PWM rectifier cabinet to operate in a rectification mode and the first PWM rectifier cabinet to operate in an inversion mode;
the control console is further used for acquiring a first test parameter when the second bidirectional DC-DC converter cabinet operates in a boost mode and a second test parameter when the first bidirectional DC-DC converter cabinet operates in a buck mode, obtaining a first test result of the second bidirectional DC-DC converter cabinet according to the first test parameter and obtaining a second test result of the first bidirectional DC-DC converter cabinet according to the second 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 second bidirectional DC-DC converter cabinet according to the first test parameters includes:
and obtaining a first test result of the second 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 a 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 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 obtaining a second test result of the first bidirectional DC-DC converter cabinet according to the second test parameter includes:
and obtaining a second test result of the first bidirectional DC-DC converter cabinet 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 comprises a second power examination result, a second energy efficiency examination result, a second current-voltage ripple rate examination result, a second current-voltage error examination result and a second ambient 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 second bidirectional DC-DC converter cabinet is configured to maintain the voltage value of the second end of the second bidirectional DC-DC converter cabinet at a second constant voltage through a voltage-current dual closed-loop control manner.
Optionally, the first bidirectional DC-DC converter cabinet is configured to maintain a current value of the second end of the first bidirectional DC-DC converter cabinet at a first constant current through a current closed-loop control manner.
Optionally, the first PWM rectifier cabinet is configured to maintain the voltage value of the second end of the first PWM rectifier cabinet at a third constant voltage in a voltage-current dual closed-loop control manner.
Optionally, the method further comprises:
the control console is further used for controlling the first bidirectional DC-DC converter cabinet to operate in a boost mode, controlling the second bidirectional DC-DC converter cabinet to operate in a buck mode, controlling the first PWM rectifier cabinet to operate in a rectification mode, and controlling the second PWM rectifier cabinet to operate in an inversion mode;
the control console is further used for acquiring a third test parameter when the first bidirectional DC-DC converter cabinet operates in a boost mode and a fourth test parameter when the second bidirectional DC-DC converter cabinet operates in a buck mode, obtaining a third test result of the first bidirectional DC-DC converter cabinet according to the third test parameter and obtaining a fourth test result of the second bidirectional DC-DC converter cabinet according to the fourth test parameter.
The embodiment of the utility model provides a two-way DC-DC converter test platform, including first two-way DC-DC converter cabinet, the two-way DC-DC converter cabinet of second, first PWM rectifier cabinet, second PWM rectifier cabinet, control cabinet and input power. The control console controls the bidirectional DC-DC converter cabinet and the PWM rectifier cabinet to operate in different modes, collects first test parameters of the second bidirectional DC-DC converter cabinet in the boost mode, and obtains a first test result based on the first test parameters. And acquiring a second test parameter of the first bidirectional DC-DC converter cabinet when the first bidirectional DC-DC converter cabinet operates in the voltage reduction mode, and obtaining a second test result based on the second test parameter. The electric energy obtained by the second PWM rectifier cabinet from the input power supply passes through the second bidirectional DC-DC converter cabinet and the first bidirectional DC-DC converter cabinet and 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, so that the examination test of the high-capacity bidirectional DC-DC converter during boosting or reducing is realized under the limited power supply and load capacity.
Drawings
Fig. 1 is a bidirectional DC-DC converter testing platform provided in an embodiment of the present invention;
fig. 2 is another bidirectional DC-DC converter testing platform provided in the 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 testing method for a bidirectional DC-DC converter according to an embodiment of the present invention;
fig. 6 is another testing method for a bidirectional DC-DC converter 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 a test platform for a bidirectional DC-DC converter provided by an embodiment of the present invention, as shown in fig. 1, the test platform includes a first bidirectional DC-DC converter cabinet 1, a second bidirectional DC-DC converter cabinet 2, a first PWM rectifier cabinet 3, a second PWM rectifier cabinet 4, a console 5 and an input power supply 6.
An input power source 6 is connected 41 to the first terminal 31 of the first PWM rectifier cabinet 3 and the first terminal of the second PWM rectifier cabinet 4, respectively.
The second end 42 of the second PWM rectifier cabinet 4 is connected 21 to the first end of the second bidirectional DC-DC converter cabinet 2, the second end 22 of the second bidirectional DC-DC converter cabinet 2 is connected 11 to the first end of the first bidirectional DC-DC converter cabinet 1, and the second end 12 of the first bidirectional DC-DC converter cabinet 1 is connected 32 to the second end of the first PWM rectifier cabinet 3.
The console 5 is respectively connected with the first bidirectional DC-DC converter cabinet 1, the second bidirectional DC-DC converter cabinet 2, the first PWM rectifier cabinet 3 and the second PWM rectifier cabinet 4, and the console 5 is used for controlling the second bidirectional DC-DC converter cabinet 2 to operate in a boost mode, and controlling the first bidirectional DC-DC converter cabinet 1 to operate in a buck mode, and controlling the second PWM rectifier cabinet 4 to operate in a rectification mode, and controlling the first PWM rectifier cabinet 3 to operate in an inversion mode.
The console 5 is further configured to acquire a first test parameter when the second bidirectional DC-DC converter cabinet 2 operates in the boost mode and a second test parameter when the first bidirectional DC-DC converter cabinet 1 operates in the buck mode, obtain a first test result of the second bidirectional DC-DC converter cabinet 2 according to the first test parameter, and obtain a second test result of the first bidirectional DC-DC converter cabinet 1 according to the second test parameter.
In this embodiment, the input power source refers to an ac power source, and may be, for example, an ac power source with a voltage of 380V and a frequency of 50Hz, which is input by a low-voltage power grid.
The control console controls the second bidirectional DC-DC converter cabinet, the first bidirectional DC-DC converter cabinet, the second PWM rectifier cabinet and the first PWM rectifier cabinet to operate in a boosting mode, a voltage reduction mode, a rectification mode and an inversion mode respectively. The boost mode is: a mode for converting the lower DC voltage to a desired higher DC voltage; the pressure reduction mode is as follows: the higher dc voltage is converted to the required lower dc voltage mode. 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 second bidirectional DC-DC converter cabinet operates in a boost mode to boost the DC voltage V1 to the DC voltage V2, wherein V2 is greater than V1; furthermore, the first bidirectional DC-DC converter cabinet operates in a buck mode, and converts the DC voltage V2 into a DC voltage V3, where V3 is smaller than V2, and V3 and V1 may be the same or different; 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 second bidirectional DC-DC converter cabinet is boosted and a second test result when the first bidirectional DC-DC converter cabinet is reduced by acquiring test parameters of the first bidirectional DC-DC converter cabinet and the second bidirectional DC-DC converter cabinet.
In this embodiment, a test result of the bidirectional DC-DC converter cabinet during voltage boosting or voltage dropping can be obtained only through one test process. And the electric energy obtained by the second PWM rectifier cabinet from the input power supply passes through the second bidirectional DC-DC converter cabinet and the first bidirectional DC-DC converter cabinet and 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, so that the examination test of the high-capacity bidirectional DC-DC converter during boosting or reducing the voltage is realized under the limited power supply and load capacity.
Fig. 2 is another bidirectional DC-DC converter testing platform provided in the embodiment of the present invention, on the basis of fig. 1, as shown in fig. 2, further including:
the input power source comprises a low-voltage power grid 61, a low-voltage power distribution cabinet 62 and an isolation transformer 63, and the input power source 6 is used for supplying power to the first PWM rectifier cabinet 3 and the second PWM rectifier cabinet 4.
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 63 is a three-winding transformer.
The input power source 6 is connected 41 to the first end 31 of the first PWM rectifier cabinet 3 and the first end of the second PWM rectifier cabinet 4, respectively, and includes:
the first terminal 31 of the first PWM rectifier cabinet 3 and the first terminal 41 of the second PWM rectifier cabinet 4 are connected to two windings on the secondary side of the isolation transformer 63, 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 31 of the first PWM rectifier cabinet 3 and the first end 41 of the second PWM rectifier cabinet 4.
Optionally, the first bidirectional DC-DC converter cabinet includes a first bidirectional DC-DC converter and a first bidirectional DC-DC controller, the second bidirectional DC-DC converter cabinet includes a second bidirectional DC-DC converter and a second 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 first bidirectional DC-DC converter cabinet, the second bidirectional DC-DC converter cabinet, the first PWM rectifier cabinet and the second PWM rectifier cabinet, respectively, and includes:
the console is connected with the first bidirectional DC-DC controller, the second 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 first bidirectional DC-DC converter cabinet, the second 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 obtaining a first test result of the second bidirectional DC-DC converter cabinet 2 according to the first test parameters includes:
and obtaining a first test result of the second bidirectional DC-DC converter cabinet 2 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 includes but is not limited to 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.
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 boosting, P (t) is power at the time t, u (t) is first output instantaneous voltage at the time t, and i (t) is first output instantaneous current at the 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 to a second 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 second bidirectional DC-DC converter cabinet during boosting can be obtained.
Optionally, 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, and the obtaining a second test result of the first bidirectional DC-DC converter cabinet 1 according to the second test parameters includes:
and obtaining a second test result of the first 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 acquired when the second bidirectional DC-DC converter cabinet operates in the boost mode, and the second test parameter is a parameter acquired when the first bidirectional DC-DC converter cabinet operates in the buck mode. Therefore, in the second test result, the second power examination result, the second energy efficiency examination result, the second current-voltage ripple rate examination result, the second current-voltage error examination result, and the second environment temperature examination 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 calculation formula of the first test result, which is not described herein again.
And obtaining a second test result of the first bidirectional DC-DC converter cabinet during voltage reduction by using the same calculation method as the first test result.
Optionally, the second PWM rectifier cabinet 4 is configured to maintain the voltage value of the second terminal 42 of the second PWM rectifier cabinet 4 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 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_refIn the current inner loop, 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 second bidirectional DC-DC converter cabinet 2 is configured to maintain the voltage value at the second end 22 of the second bidirectional DC-DC converter cabinet 2 at a second constant voltage by means of a voltage-current dual closed-loop control.
The voltage-current double closed loop control mode is used for controlling the voltage of the second end 22 of the second bidirectional DC-DC converter cabinet 2 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 first bidirectional DC-DC converter cabinet 1 is configured to maintain the current value of the second end 12 of the first bidirectional DC-DC converter cabinet 1 at a 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 first 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, the first PWM rectifier cabinet 3 is configured to maintain the voltage value of the second terminal 32 of the first PWM rectifier cabinet 3 at the third 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 first 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.
Fig. 1 shows the second bidirectional DC-DC converter cabinet 2 operating in the boost mode, the first bidirectional DC-DC converter cabinet 1 operating in the buck mode, the second PWM rectifier cabinet 4 operating in the rectification mode, and the first PWM rectifier cabinet 3 operating in the inverter mode, which in an alternative embodiment further includes:
the control console 5 is further used for controlling the first bidirectional DC-DC converter cabinet 1 to operate in a boost mode, controlling the second bidirectional DC-DC converter cabinet 2 to operate in a buck mode, controlling the first PWM rectifier cabinet 3 to operate in a rectification mode, and controlling the second PWM rectifier cabinet 4 to operate in an inversion mode;
the console 5 is further configured to acquire a third test parameter when the first bidirectional DC-DC converter cabinet 1 operates in the boost mode and a fourth test parameter when the second bidirectional DC-DC converter cabinet 2 operates in the buck mode, obtain a third test result of the first bidirectional DC-DC converter cabinet 1 according to the third test parameter, and obtain a fourth test result of the second bidirectional DC-DC converter cabinet 2 according to the fourth test parameter.
The flowing process of the current is as follows: firstly, a first PWM rectifier cabinet operates in a rectification mode, and converts alternating current of an input power supply into direct current with direct current voltage V4; secondly, the first bidirectional DC-DC converter cabinet operates in a boost mode to boost the DC voltage V4 to the DC voltage V5, wherein V5 is greater than V4; the second bidirectional DC-DC converter cabinet operates in a buck mode to convert the DC voltage V5 into a DC voltage V6, where V6 is smaller than V5, and V6 and V4 may be the same or different; 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. The control console further obtains a third test result when the first bidirectional DC-DC converter cabinet is boosted and a fourth test result when the second bidirectional DC-DC converter cabinet is reduced by acquiring test parameters of the first bidirectional DC-DC converter cabinet and the second bidirectional DC-DC converter cabinet. In this embodiment, the first test result and the fourth test result are combined to obtain the overall test result of the second bidirectional DC-DC converter cabinet during voltage boosting and voltage dropping, and the second test result and the third test result are combined to obtain the overall test result of the first bidirectional DC-DC converter cabinet during voltage boosting and voltage dropping.
According to the embodiment, the comprehensive test results of the two bidirectional DC-DC converter cabinets in boosting and reducing can be obtained only through one test process, and the test efficiency is improved.
Optionally, the third test parameter includes a third input instantaneous current, a third input instantaneous voltage, a third output instantaneous current, a third output instantaneous voltage, and a third ambient temperature, and the obtaining a third test result of the first bidirectional DC-DC converter cabinet 1 according to the third test parameter includes:
and obtaining a third test result of the first bidirectional DC-DC converter cabinet 1 according to the third input instantaneous current, the third input instantaneous voltage, the third output instantaneous current, the third output instantaneous voltage and the third environment temperature, wherein the third test result includes but is not limited to a third power check result, a third energy efficiency check result, a third current-voltage ripple rate check result, a third current-voltage error check result and a third environment temperature check result.
The third test parameters include a third input instantaneous current, a third input instantaneous voltage, a third output instantaneous current, a third output instantaneous voltage, and a third ambient temperature, which differ from the first test parameters by: the first test parameter is a parameter acquired when the second bidirectional DC-DC converter cabinet operates in the boost mode, and the third test parameter is a parameter acquired when the first bidirectional DC-DC converter cabinet operates in the boost mode. Therefore, in the third test result, the third power check result, the third energy efficiency check result, the third current-voltage ripple rate check result, the third current-voltage error check result, and the third ambient temperature check result are calculated from the third input instantaneous current, the third input instantaneous voltage, the third output instantaneous current, the third output instantaneous voltage, and the third ambient temperature, and the calculation formula can calculate the third test parameter by replacing the third test parameter with the first test parameter in the first test result calculation formula, which is not described herein again.
And obtaining a third test result of the first bidirectional DC-DC converter cabinet during boosting through a calculation method which is the same as the first test result.
Optionally, the fourth test parameter includes a fourth input instantaneous current, a fourth input instantaneous voltage, a fourth output instantaneous current, a fourth output instantaneous voltage, and a fourth ambient temperature, and the obtaining a fourth test result of the second bidirectional DC-DC converter cabinet 2 according to the fourth test parameter includes:
and obtaining a fourth test result of the second bidirectional DC-DC converter cabinet 2 according to the fourth input instantaneous current, the fourth input instantaneous voltage, the fourth output instantaneous current, the fourth output instantaneous voltage and the fourth ambient temperature, wherein the fourth test result includes but is not limited to a fourth power examination result, a fourth energy efficiency examination result, a fourth current-voltage ripple rate examination result, a fourth current-voltage error examination result and a fourth ambient temperature examination result.
The fourth test parameters include a fourth input instantaneous current, a fourth input instantaneous voltage, a fourth output instantaneous current, a fourth output instantaneous voltage, and a fourth ambient temperature, which are different from the first test parameters in that: the first test parameter is a parameter collected for the second bidirectional DC-DC converter cabinet operating in boost mode, and the fourth test parameter is a parameter collected for the second bidirectional DC-DC converter cabinet operating in buck mode. Therefore, in the fourth test result, the fourth power examination result, the fourth energy efficiency examination result, the fourth current-voltage ripple rate examination result, the fourth current-voltage error examination result, and the fourth ambient temperature examination result are calculated from the fourth input instantaneous current, the fourth input instantaneous voltage, the fourth output instantaneous current, the fourth output instantaneous voltage, and the fourth ambient temperature, and the calculation formula can calculate the fourth test parameter by replacing the fourth test parameter with the first test parameter in the calculation formula of the first test result, which is not described herein again.
And obtaining a fourth test result of the second bidirectional DC-DC converter cabinet during voltage reduction by using the same calculation method as the first test result.
Optionally, the second PWM rectifier cabinet 4 is configured to maintain the voltage value of the second end 42 of the second PWM rectifier cabinet 4 at a fourth constant voltage through a voltage-current dual closed-loop control manner.
The fourth constant voltage may be the same as or different from the first constant voltage.
Optionally, the second bidirectional DC-DC converter cabinet 2 is configured to maintain the voltage value at the second end 22 of the second bidirectional DC-DC converter cabinet 2 at a fifth constant voltage in a voltage-current dual closed-loop control manner.
The fifth constant voltage may be the same as or different from the second constant voltage.
Optionally, the first bidirectional DC-DC converter cabinet 1 is configured to maintain the current value of the second end 12 of the first 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, the first PWM rectifier cabinet 3 is configured to maintain the voltage value of the second terminal 32 of the first PWM rectifier cabinet 3 at the sixth constant voltage in a voltage-current dual closed-loop control manner.
The sixth constant voltage may be the same as or different from the third constant voltage.
Fig. 5 is a schematic flow chart of a bidirectional DC-DC converter testing method provided in the embodiment of the present invention, as shown in fig. 5, the method is applied to a bidirectional DC-DC converter testing platform, the testing platform includes a first bidirectional DC-DC converter cabinet, a second bidirectional DC-DC converter cabinet, a first PWM rectifier cabinet, a second PWM rectifier cabinet, a console and an input power source, and the method includes:
s101, the console sends a first configuration instruction to the second PWM rectifier cabinet, and the first configuration instruction is used for configuring the second PWM rectifier cabinet to operate in a rectification mode.
And S102, the console sends a second configuration instruction to the second bidirectional DC-DC converter cabinet, and the second configuration instruction is used for configuring the second bidirectional DC-DC converter cabinet to operate in a boost mode.
S103, the console sends a third configuration instruction to the first bidirectional DC-DC converter cabinet, and the third configuration instruction is used for configuring the first bidirectional DC-DC converter cabinet to operate in a voltage reduction mode.
And S104, the console sends a fourth configuration instruction to the first PWM rectifier cabinet, and the fourth configuration instruction is used for configuring the first PWM rectifier cabinet to operate in an inversion mode.
And S105, the console sends a first control instruction to the second bidirectional DC-DC converter cabinet, and the first control instruction is used for indicating the second bidirectional DC-DC converter cabinet to start and operate.
And S106, the console sends a second control instruction to the first bidirectional DC-DC converter cabinet, and the second control instruction is used for indicating the first bidirectional DC-DC converter cabinet to start to operate.
And S107, the console sends a third control instruction to the first PWM rectifier cabinet, and the third control instruction is used for indicating the first PWM rectifier cabinet to start running.
And S108, the console sends a fourth control instruction to the second PWM rectifier cabinet, and the fourth control instruction is used for indicating the second PWM rectifier cabinet to start running.
S109, the console collects first test parameters of the second bidirectional DC-DC converter cabinet when the second bidirectional DC-DC converter cabinet operates in a boosting mode and second test parameters of the first bidirectional DC-DC converter cabinet when the first bidirectional DC-DC converter cabinet operates in a voltage reduction mode, obtains a first test result of the second bidirectional DC-DC converter cabinet according to the first test parameters, and obtains a second test result of the first bidirectional DC-DC converter cabinet according to the second 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 S102, the second configuration command instructs the second bidirectional DC-DC converter cabinet to adopt a voltage-current dual closed-loop control mode, so as to input a preset output voltage V2 to the voltage-current dual closed-loop control circuit, and after regulation, the second end of the second bidirectional DC-DC converter cabinet outputs a DC voltage with a voltage value of V2 and V2 being greater than V1, that is, the second bidirectional DC-DC converter cabinet operates in a boost mode.
The output voltage of the second terminal of the first bidirectional DC-DC converter cabinet is determined by the first PWM rectifier cabinet, in step 104, the fourth configuration command instructs the first PWM rectifier cabinet to adopt a voltage-current double closed loop control mode, a preset output voltage V3 is input to the voltage-current double closed loop control circuit, after regulation, the second terminal of the first PWM rectifier cabinet outputs a DC voltage with a voltage value of V3, since the second terminal of the first PWM rectifier cabinet is connected with the second terminal of the first bidirectional DC-DC converter, the voltage of the second terminal of the first bidirectional DC-DC converter cabinet is also V3, and V3 is smaller than V2, that is, the first bidirectional DC-DC converter cabinet operates in a buck mode.
Meanwhile, in step S103, the third configuration command instructs the first bidirectional DC-DC converter cabinet to adopt a current closed-loop control mode, and a preset output current is input to the current dual closed-loop control circuit, and after adjustment, the first bidirectional DC-DC converter cabinet outputs a constant current, and the power of the system is controlled to be constant by the constant current and the voltage V3.
The execution sequence of steps S101-S104 may be arbitrarily interchanged, or may be executed simultaneously.
The execution sequence of steps S105-S107 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 second bidirectional DC-DC converter cabinet operates in a boost mode to boost the DC voltage V1 to the DC voltage V2, wherein V2 is greater than V1; furthermore, the first bidirectional DC-DC converter cabinet operates in a buck mode, and converts the DC voltage V2 into a DC voltage V3, where V3 is smaller than V2, and V3 and V1 may be the same or different; 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 second bidirectional DC-DC converter cabinet is boosted and a second test result when the first bidirectional DC-DC converter cabinet is reduced by acquiring test parameters of the first bidirectional DC-DC converter cabinet and the second bidirectional DC-DC converter cabinet.
In this embodiment, a test result of the bidirectional DC-DC converter cabinet during voltage boosting or voltage dropping can be obtained only through one test process. And the electric energy obtained by the second PWM rectifier cabinet from the input power supply passes through the second bidirectional DC-DC converter cabinet and the first bidirectional DC-DC converter cabinet and 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, so that the examination test of the high-capacity bidirectional DC-DC converter during boosting or reducing the voltage is realized under the limited power supply and load capacity.
Optionally, the first test parameter includes 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 second bidirectional DC-DC converter cabinet according to the first test parameter includes:
and obtaining a first test result of the second 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.
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 second bidirectional DC-DC converter cabinet during boosting can be obtained.
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 obtaining a second test result of the first bidirectional DC-DC converter cabinet according to the second test parameter includes:
and obtaining a second test result of the first bidirectional DC-DC converter cabinet 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 comprises 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 acquired when the second bidirectional DC-DC converter cabinet operates in the boost mode, and the second test parameter is a parameter acquired when the first bidirectional DC-DC converter cabinet operates in the buck mode. Therefore, in the second test result, the second power examination result, the second energy efficiency examination result, the second current-voltage ripple rate examination result, the second current-voltage error examination result, and the second environment temperature examination 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 first test parameter by correspondingly replacing the second test parameter with the first test parameter in the calculation formula of the first test result, which is not described herein again.
And obtaining a second test result of the first bidirectional DC-DC converter cabinet during voltage reduction by using the same calculation method as the first test result.
Optionally, the first configuration instruction is further configured to configure the second PWM rectifier cabinet to maintain the voltage value of the second terminal of the second PWM rectifier cabinet at the first constant 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 42 of the second PWM rectifier cabinet 4 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 second bidirectional DC-DC converter cabinet to maintain the voltage value of the second end of the second bidirectional DC-DC converter cabinet at a second 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 22 of the second bidirectional DC-DC converter cabinet 2 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 third configuration instruction is further configured to configure the first bidirectional DC-DC converter cabinet to maintain the current value of the second end of the first bidirectional DC-DC converter cabinet 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 first bidirectional DC-DC converter cabinet 1 to be constant. The current closed loop control method is the same as that of the first bidirectional DC-DC converter cabinet, and is not described again.
Optionally, the fourth 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 third constant 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 32 of the first PWM rectifier cabinet 3 to be constant. The voltage and current double closed loop control mode is the same as the mode of the second PWM rectifier cabinet, and the description is omitted.
Fig. 6 is another testing method for a bidirectional DC-DC converter provided by the embodiment of the present invention, and on the basis of fig. 5, as shown in fig. 6, the testing method further includes:
s201, the console sends a fifth configuration instruction to the first PWM rectifier cabinet, and the fifth configuration instruction is used for configuring the first PWM rectifier cabinet to operate in a rectification mode.
S202, the console sends a sixth configuration instruction to the first bidirectional DC-DC converter cabinet, and the sixth configuration instruction is used for configuring the first bidirectional DC-DC converter cabinet to operate in a boost mode.
S203, the console sends a seventh configuration instruction to the second bidirectional DC-DC converter cabinet, and the seventh configuration instruction is used for configuring the second bidirectional DC-DC converter cabinet to operate in a voltage reduction mode.
And S204, the console sends an eighth configuration instruction to the second PWM rectifier cabinet, and the eighth configuration instruction is used for configuring the second PWM rectifier cabinet to operate in an inversion mode.
S205, the console sends a fifth control instruction to the first bidirectional DC-DC converter cabinet, and the fifth control instruction is used for indicating the first bidirectional DC-DC converter cabinet to start to operate.
S206, the console sends a sixth control instruction to the second bidirectional DC-DC converter cabinet, and the sixth control instruction is used for indicating the second bidirectional DC-DC converter cabinet to start and operate.
And S207, the console sends a seventh control instruction to the second PWM rectifier cabinet, and the seventh control instruction is used for indicating the second PWM rectifier cabinet to start running.
And S208, the console sends an eighth control instruction to the first PWM rectifier cabinet, and the eighth control instruction is used for indicating the first PWM rectifier cabinet to start running.
S209, the console collects a third test parameter when the first bidirectional DC-DC converter cabinet operates in a boost mode and a fourth test parameter when the second bidirectional DC-DC converter cabinet operates in a buck mode, obtains a third test result of the first bidirectional DC-DC converter cabinet according to the third test parameter, and obtains a fourth test result of the second bidirectional DC-DC converter cabinet according to the fourth test parameter.
In step S201, the fifth configuration command instructs the first PWM rectifier cabinet to adopt a voltage-current dual closed-loop control mode, and a preset output voltage V4 is input to the voltage-current dual closed-loop control circuit, and after adjustment, the second end of the first PWM rectifier cabinet outputs a dc voltage with a voltage value of V4.
In step S202, the sixth configuration command instructs the first bidirectional DC-DC converter cabinet to adopt a voltage-current dual closed-loop control mode, and a preset output voltage V5 is input to the voltage-current dual closed-loop control circuit, and after adjustment, the second terminal of the first bidirectional DC-DC converter cabinet outputs a DC voltage with a voltage value of V5 and V5 being greater than V4, that is, the first bidirectional DC-DC converter cabinet operates in a boost mode.
The output voltage of the second terminal of the second bidirectional DC-DC converter cabinet is determined by the second PWM rectifier cabinet, in step S204, the eighth configuration command instructs the second PWM rectifier cabinet to adopt a voltage-current dual closed-loop control manner, a preset output voltage V6 is input to the voltage-current dual closed-loop control circuit, after regulation, the second terminal of the second PWM rectifier cabinet outputs a DC voltage with a voltage value of V6, since the second terminal of the second PWM rectifier cabinet is connected with the second terminal of the second bidirectional DC-DC converter, the voltage of the second terminal of the second bidirectional DC-DC converter is also V6, and V6 is smaller than V5, that is, the bidirectional DC-DC converter cabinet operates in a buck mode.
Meanwhile, in step S203, the seventh configuration command instructs the second 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 being adjusted, the second bidirectional DC-DC converter cabinet outputs a constant current, and the power of the system is controlled to be constant by the constant current and the voltage V6.
The execution sequence of steps S201 to S204 may be arbitrarily interchanged, or may be executed simultaneously.
The execution sequence of steps S205-S207 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, and converts alternating current of an input power supply into direct current with direct current voltage V4; secondly, the first bidirectional DC-DC converter cabinet operates in a boost mode to boost the DC voltage V4 to the DC voltage V5, wherein V5 is greater than V4; the second bidirectional DC-DC converter cabinet operates in a buck mode to convert the DC voltage V5 into a DC voltage V6, where V6 is smaller than V5, and V6 and V4 may be the same or different; 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. The control console further obtains a third test result when the first bidirectional DC-DC converter cabinet is boosted and a fourth test result when the second bidirectional DC-DC converter cabinet is reduced by acquiring test parameters of the first bidirectional DC-DC converter cabinet and the second bidirectional DC-DC converter cabinet. In this embodiment, the first test result and the fourth test result are combined to obtain the overall test result of the second bidirectional DC-DC converter cabinet during voltage boosting and voltage dropping, and the second test result and the third test result are combined to obtain the overall test result of the first bidirectional DC-DC converter cabinet during voltage boosting and voltage dropping.
According to the embodiment, the comprehensive test results of the two bidirectional DC-DC converter cabinets in boosting and reducing can be obtained only through one test process, and the test efficiency is improved.
Optionally, the third test parameter includes a third input instantaneous current, a third input instantaneous voltage, a third output instantaneous current, a third output instantaneous voltage, and a third ambient temperature, and the obtaining a third test result of the first bidirectional DC-DC converter cabinet 1 according to the third test parameter includes:
and obtaining a third test result of the first bidirectional DC-DC converter cabinet 1 according to the third input instantaneous current, the third input instantaneous voltage, the third output instantaneous current, the third output instantaneous voltage and the third environment temperature, wherein the third test result includes but is not limited to a third power check result, a third energy efficiency check result, a third current-voltage ripple rate check result, a third current-voltage error check result and a third environment temperature check result.
The third test parameters include a third input instantaneous current, a third input instantaneous voltage, a third output instantaneous current, a third output instantaneous voltage, and a third ambient temperature, which differ from the first test parameters by: the first test parameter is a parameter acquired when the second bidirectional DC-DC converter cabinet operates in the boost mode, and the third test parameter is a parameter acquired when the first bidirectional DC-DC converter cabinet operates in the boost mode. Therefore, in the third test result, the third power check result, the third energy efficiency check result, the third current-voltage ripple rate check result, the third current-voltage error check result, and the third ambient temperature check result are calculated from the third input instantaneous current, the third input instantaneous voltage, the third output instantaneous current, the third output instantaneous voltage, and the third ambient temperature, and the calculation formula can calculate the third test parameter by replacing the third test parameter with the first test parameter in the first test result calculation formula, which is not described herein again.
And obtaining a third test result of the first bidirectional DC-DC converter cabinet during boosting through a calculation method which is the same as the first test result.
Optionally, the fourth test parameter includes a fourth input instantaneous current, a fourth input instantaneous voltage, a fourth output instantaneous current, a fourth output instantaneous voltage, and a fourth ambient temperature, and the obtaining a fourth test result of the second bidirectional DC-DC converter cabinet 2 according to the fourth test parameter includes:
and obtaining a fourth test result of the second bidirectional DC-DC converter cabinet 2 according to the fourth input instantaneous current, the fourth input instantaneous voltage, the fourth output instantaneous current, the fourth output instantaneous voltage and the fourth ambient temperature, wherein the fourth test result includes but is not limited to a fourth power examination result, a fourth energy efficiency examination result, a fourth current-voltage ripple rate examination result, a fourth current-voltage error examination result and a fourth ambient temperature examination result.
The fourth test parameters include a fourth input instantaneous current, a fourth input instantaneous voltage, a fourth output instantaneous current, a fourth output instantaneous voltage, and a fourth ambient temperature, which are different from the first test parameters in that: the first test parameter is a parameter collected for the second bidirectional DC-DC converter cabinet operating in boost mode, and the fourth test parameter is a parameter collected for the second bidirectional DC-DC converter cabinet operating in buck mode. Therefore, in the fourth test result, the fourth power examination result, the fourth energy efficiency examination result, the fourth current-voltage ripple rate examination result, the fourth current-voltage error examination result, and the fourth ambient temperature examination result are calculated from the fourth input instantaneous current, the fourth input instantaneous voltage, the fourth output instantaneous current, the fourth output instantaneous voltage, and the fourth ambient temperature, and the calculation formula can calculate the fourth test parameter by replacing the fourth test parameter with the first test parameter in the calculation formula of the first test result, which is not described herein again.
And obtaining a fourth test result of the second bidirectional DC-DC converter cabinet during voltage reduction by using the same calculation method as the first test result.
Optionally, the second PWM rectifier cabinet 4 is configured to maintain the voltage value of the second end 42 of the second PWM rectifier cabinet 4 at a fourth constant voltage through a voltage-current dual closed-loop control manner.
The fourth constant voltage may be the same as or different from the first constant voltage.
Optionally, the second bidirectional DC-DC converter cabinet 2 is configured to maintain the voltage value at the second end 22 of the second bidirectional DC-DC converter cabinet 2 at a fifth constant voltage in a voltage-current dual closed-loop control manner.
The fifth constant voltage may be the same as or different from the second constant voltage.
Optionally, the first bidirectional DC-DC converter cabinet 1 is configured to maintain the current value of the second end 12 of the first 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, the first PWM rectifier cabinet 3 is configured to maintain the voltage value of the second terminal 32 of the first PWM rectifier cabinet 3 at the sixth constant voltage in a voltage-current dual closed-loop control manner.
The sixth constant voltage may be the same as or different from the third constant voltage.
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 (10)
1. A bidirectional DC-DC converter test platform is characterized in that:
the system comprises a first bidirectional DC-DC converter cabinet, a second 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 second bidirectional DC-DC converter cabinet, the second end of the second bidirectional DC-DC converter cabinet is connected with the first end of the first bidirectional DC-DC converter cabinet, and the second end of the first bidirectional DC-DC converter cabinet is connected with the second end of the first PWM rectifier cabinet;
the console is respectively connected with the first bidirectional DC-DC converter cabinet, the second 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 second bidirectional DC-DC converter cabinet to operate in a voltage boosting mode, the first bidirectional DC-DC converter cabinet to operate in a voltage reducing mode, the second pulse width modulation rectifier cabinet to operate in a rectifying mode and the first pulse width modulation rectifier cabinet to operate in an inverting mode;
the control console is further used for acquiring a first test parameter when the second bidirectional DC-DC converter cabinet operates in a boost mode and a second test parameter when the first bidirectional DC-DC converter cabinet operates in a buck mode, obtaining a first test result of the second bidirectional DC-DC converter cabinet according to the first test parameter and obtaining a second test result of the first bidirectional DC-DC converter cabinet according to the second 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 comprise 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 second bidirectional DC-DC converter cabinet according to the first test parameters comprises:
and obtaining a first test result of the second 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 a 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, wherein the second test parameters comprise 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 wherein obtaining a second test result of the first bi-directional DC-DC converter cabinet according to the second test parameters comprises:
and obtaining a second test result of the first bidirectional DC-DC converter cabinet 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 comprises a second power examination result, a second energy efficiency examination result, a second current-voltage ripple rate examination result, a second current-voltage error examination result and a second ambient temperature examination result.
6. 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.
7. The test platform of claim 1,
and the second bidirectional DC-DC converter cabinet is used for maintaining the voltage value of the second end of the second bidirectional DC-DC converter cabinet at a second constant voltage in a voltage-current double closed-loop control mode.
8. The test platform of claim 1,
the first bidirectional DC-DC converter cabinet is used for maintaining the current value of the second end of the first bidirectional DC-DC converter cabinet at a first constant current in a current closed-loop control mode.
9. The test platform of claim 1,
the first pulse width modulation rectifier cabinet is used for maintaining the voltage value of the second end of the first pulse width modulation rectifier cabinet at a third constant voltage in a voltage and current double closed loop control mode.
10. The test platform of any one of claims 1-9, further comprising:
the control console is further used for controlling the first bidirectional DC-DC converter cabinet to operate in a boost mode, controlling the second bidirectional DC-DC converter cabinet to operate in a buck mode, controlling the first pulse width modulation rectifier cabinet to operate in a rectification mode, and controlling the second pulse width modulation rectifier cabinet to operate in an inversion mode;
the control console is further used for acquiring a third test parameter when the first bidirectional DC-DC converter cabinet operates in a boost mode and a fourth test parameter when the second bidirectional DC-DC converter cabinet operates in a buck mode, obtaining a third test result of the first bidirectional DC-DC converter cabinet according to the third test parameter and obtaining a fourth test result of the second bidirectional DC-DC converter cabinet according to the fourth test parameter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921589782.1U CN211785819U (en) | 2019-09-23 | 2019-09-23 | Bidirectional DC-DC converter test platform |
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| CN201921589782.1U CN211785819U (en) | 2019-09-23 | 2019-09-23 | Bidirectional DC-DC converter test platform |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114740293A (en) * | 2022-04-02 | 2022-07-12 | 中汽研新能源汽车检验中心(天津)有限公司 | Device for testing transient immunity of low-voltage output port of automobile DC-DC converter |
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2019
- 2019-09-23 CN CN201921589782.1U patent/CN211785819U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114740293A (en) * | 2022-04-02 | 2022-07-12 | 中汽研新能源汽车检验中心(天津)有限公司 | Device for testing transient immunity of low-voltage output port of automobile DC-DC converter |
| CN114740293B (en) * | 2022-04-02 | 2024-03-12 | 中汽研新能源汽车检验中心(天津)有限公司 | Automobile DC-DC converter low-voltage output port transient immunity testing device |
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