CN114167272B - Flexible direct current converter valve steady-state operation test device and method - Google Patents
Flexible direct current converter valve steady-state operation test device and method Download PDFInfo
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- CN114167272B CN114167272B CN202111464273.8A CN202111464273A CN114167272B CN 114167272 B CN114167272 B CN 114167272B CN 202111464273 A CN202111464273 A CN 202111464273A CN 114167272 B CN114167272 B CN 114167272B
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- 239000003990 capacitor Substances 0.000 claims description 40
- 238000010998 test method Methods 0.000 abstract description 8
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
Abstract
The embodiment of the invention provides a steady-state operation test device and a steady-state operation test method for a flexible direct-current converter valve, wherein the device comprises a first resonant circuit, a second resonant circuit, a pressure-bearing circuit, a high-voltage direct-current power supply, a first sample valve and a second sample valve; the first end of the first resonant circuit is connected with the high-voltage direct current power supply, the second end of the first resonant circuit is connected with the input end of the pressure-bearing circuit, the first output end and the second output end of the pressure-bearing circuit are respectively connected with the first sample valve and the second sample valve, the first end of the second resonant circuit is connected with the first output end of the pressure-bearing circuit, and the second end of the second resonant circuit is connected with the second output end of the pressure-bearing circuit. The device combines the first resonant circuit and the second resonant circuit, separates AC and DC voltage from current, and can directly use a high-voltage DC power supply to supplement energy for the sample valve. The structure is simple, the high-voltage direct-current power supply does not need to be regulated for multiple times, and the wide applicability is realized. The device carries out steady-state operation test to two converter valves simultaneously, promotes test efficiency.
Description
Technical Field
The embodiment of the invention relates to the technical field of flexible direct current transmission and power electronic application, in particular to a steady-state operation test method and device for a flexible direct current converter valve, computer equipment and a storage medium.
Background
The flexible direct current transmission is used as a new generation direct current transmission technology, has unique advantages in operation performance compared with alternating current transmission and traditional direct current transmission, and is a high-voltage direct current transmission technology based on a converter valve modulation technology by adopting full-control devices such as IGBT. The reliability of the converter valve is one of determining factors for ensuring the reliable operation of the flexible direct current transmission system, so that the steady-state operation test of the converter valve is an important link in the production process of the converter valve.
The current method for steady-state operation test of the converter valves is quite many, the first method is to divide two groups of converter valves to be towed into test accompanying valves and tested valves, and provide a voltage source on the direct current side of each power module of the test accompanying valves, and only the tested valves participate in the test of the specified stress in each test, so that the test efficiency is reduced; the second is that the bottommost module of the test accompanying valve provides a direct current voltage source, the switching frequency of the method is obviously increased, the thermal stress is larger, but a power module is specially made for a steady-state operation test to carry out an auxiliary test; thirdly, the converter valve is supplemented by the additional energy supplementing bridge arm, but additionally the additional energy supplementing bridge arm is complicated to control, and the complexity of the system is increased; and the fourth method adopts alternating current to directly supplement energy, requires the same amplitude frequency of the alternating current and test working condition, and requires fine adjustment of alternating current voltage along with the change of modulation degree in the test process, so that the operation difficulty is high.
Disclosure of Invention
The embodiment of the invention provides a steady-state operation test method and device for a flexible direct-current converter valve, computer equipment and a storage medium, so as to improve the efficiency of steady-state operation test of a sample valve.
In a first aspect, an embodiment of the present invention provides a steady-state operation test device for a flexible dc converter valve, including a first resonant circuit, a second resonant circuit, a pressure-bearing circuit, a high-voltage dc power supply, a first sample valve and a second sample valve;
the first end of the first resonant circuit is connected with the high-voltage direct current power supply, the second end of the first resonant circuit is connected with the input end of the pressure-bearing circuit, the first output end and the second output end of the pressure-bearing circuit are respectively connected with the first sample valve and the second sample valve, the first end of the second resonant circuit is connected with the first output end of the pressure-bearing circuit, and the second end of the second resonant circuit is connected with the second output end of the pressure-bearing circuit.
Optionally, the first resonant circuit includes a first inductor and a first capacitor;
the first end of the first capacitor is connected with the high-voltage direct-current power supply, and the second end of the first capacitor is connected with the input end of the pressure-bearing circuit;
the first end of the first inductor is connected with the high-voltage direct-current power supply, and the second end of the first inductor is connected with the input end of the pressure-bearing circuit;
and the resonant frequency of the first resonant circuit is the rated frequency preset by the first sample valve and the second sample valve.
Optionally, the second resonant circuit includes a second inductor and a second capacitor;
the first end of the second capacitor is connected with the first sample valve, and the second end of the second capacitor is connected with the first end of the second inductor;
the second end of the second inductor is connected with the second sample valve;
and the resonant frequency of the second resonant circuit is the rated frequency preset by the first sample valve and the second sample valve.
Optionally, the pressure-bearing circuit comprises a third inductor and a fourth inductor;
the first end of the third inductor is connected with the first sample valve and the first end of the second resonant circuit respectively, and the second end of the third inductor is connected with the second end of the first resonant circuit;
the first end of the fourth inductor is connected with the second end of the first resonant circuit, and the second end of the fourth inductor is connected with the second sample valve and the second end of the second resonant circuit respectively.
Optionally, the high-voltage direct-current power supply comprises an uncontrolled rectifier bridge, an adjustable transformer and an alternating-current power supply;
one end of the alternating current power supply is grounded, and the other end of the alternating current power supply is connected with the input end of the adjustable transformer;
the output end of the adjustable transformer is connected with the input end of the uncontrolled rectifier bridge;
the grounding end of the uncontrolled rectifier bridge is grounded, and the output end of the uncontrolled rectifier bridge is connected with the first end of the first resonant circuit.
Optionally, the high-voltage direct-current power supply further comprises a switch;
the first end of the switch is connected with the adjustable transformer, and the second end of the switch is connected with the output end of the alternating current power supply.
Optionally, the first sample valve and the second sample valve each include a plurality of power modules connected in series.
Alternatively, the power module may be a half-bridge power module or a full-bridge power module.
In a second aspect, the embodiment of the invention further provides a steady-state operation test method of the flexible direct current converter valve, wherein a charging stage is provided before the test starts, and the charging stage comprises the following steps:
regulating an adjustable transformer in the high-voltage direct-current power supply to output zero voltage;
the high-voltage direct-current power supply is slowly boosted until the voltage of the current high-voltage direct-current power supply is the preset rated direct-current voltage, and the capacitor voltage of the power module in the first sample valve and the second sample valve reaches half of the preset rated capacitor voltage.
Optionally, a steady-state operation test method of the flexible direct current converter valve further includes: after the charging stage is completed, the first sample valve and the second sample valve unlock all the power modules so that the power modules enter a working state;
the first sample valve and the second sample valve slowly reduce the input power modules until the number of the input power modules is half of the total number of the power modules;
sinusoidal modulation signals are respectively added into the first sample valve and the second sample valve so as to control the current in the first sample valve and the second sample valve to be a preset current specified value.
The embodiment of the invention provides a steady-state operation test device and a steady-state operation test method for a flexible direct-current converter valve, wherein the device comprises a first resonant circuit, a second resonant circuit, a pressure-bearing circuit, a high-voltage direct-current power supply, a first sample valve and a second sample valve; the first end of the first resonant circuit is connected with the high-voltage direct current power supply, the second end of the first resonant circuit is connected with the input end of the pressure-bearing circuit, the first output end and the second output end of the pressure-bearing circuit are respectively connected with the first sample valve and the second sample valve, the first end of the second resonant circuit is connected with the first output end of the pressure-bearing circuit, and the second end of the second resonant circuit is connected with the second output end of the pressure-bearing circuit. The device combines the first resonant circuit and the second resonant circuit, separates AC and DC voltage from current, and can directly use a high-voltage DC power supply to supplement energy for the sample valve. The device has simple structure, the high-voltage direct-current power supply does not need to be regulated for multiple times, and the device has wide applicability. In addition, the device can simultaneously perform steady-state operation tests on the two converter valves, and the efficiency of the steady-state operation tests is greatly improved.
Drawings
FIG. 1 is a schematic structural diagram of a steady-state operation test device for a flexible DC converter valve according to a first embodiment of the present invention;
FIG. 2 is a circuit diagram of a steady-state operation test device for a flexible DC converter valve according to an embodiment of the invention;
fig. 3 is a flowchart of a steady-state operation test method of a flexible direct current converter valve according to a second embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a block diagram of a steady-state operation test device for a flexible dc converter valve according to a first embodiment of the present invention, as shown in fig. 1, the steady-state operation test device for a flexible dc converter valve may specifically include a first resonant circuit 101, a second resonant circuit 102, a pressure-bearing circuit 103, a high-voltage dc power supply 104, a first sample valve 105, and a second sample valve 106;
the first end of the first resonant circuit 101 is connected to the high-voltage dc power supply 104, the second end of the first resonant circuit 101 is connected to the input end of the pressure-bearing circuit 103, the first output end and the second output end of the pressure-bearing circuit 103 are respectively connected to the first sample valve 105 and the second sample valve 106, the first end of the second resonant circuit 102 is connected to the first output end of the pressure-bearing circuit 103, and the second end of the second resonant circuit 102 is connected to the second output end of the pressure-bearing circuit 103.
Specifically, the first resonant circuit 101 plays a role of ac/dc isolation in the whole device, and the first resonant circuit 101 isolates the voltage ac component in the first sample valve 105 and the second sample valve 106 from the dc component of the hvdc power source 104. Illustratively, the first resonant circuit 101 is used to remove the effect of the ac component of the voltage on the hvdc power source 104, such that the average capacitance voltage of the power modules in the first sample valve 105 and the second sample valve 106 is determined by the hvdc power source 104.
Exemplary, typical run test currents consist of a direct current component, a power frequency component, and other harmonics. The second resonant circuit 102 is between the first sample valve 105 and the second sample valve 106, so that the voltages between the first sample valve 105 and the second sample valve 106 are substantially the same, and the specifications of the soft straight valve type test are more easily satisfied.
The high-voltage direct-current power supply 104 supplies power to the first sample valve 105 and the second sample valve 106.
The pressure-bearing circuit 103 bears a part of the voltage drop for the first sample valve 105 and the second sample valve 106, so that the voltage drop of the direct current flowing through the pressure-bearing circuit 103 to the first sample valve 105 and the second sample valve 106 is small.
The first sample valve 105 and the second sample valve 106 are converter valves that require steady state operation tests.
The embodiment of the invention provides a steady-state operation test device of a flexible direct current converter valve, which comprises a first resonant circuit, a second resonant circuit, a pressure-bearing circuit, a high-voltage direct current power supply, a first sample valve and a second sample valve; the first end of the first resonant circuit is connected with the high-voltage direct current power supply, the second end of the first resonant circuit is connected with the input end of the pressure-bearing circuit, the first output end and the second output end of the pressure-bearing circuit are respectively connected with the first sample valve and the second sample valve, the first end of the second resonant circuit is connected with the first output end of the pressure-bearing circuit, and the second end of the second resonant circuit is connected with the second output end of the pressure-bearing circuit. The device combines the first resonant circuit and the second resonant circuit, separates AC and DC voltage from current, and can directly use a high-voltage DC power supply to supplement energy for the sample valve. The device has simple structure, the high-voltage direct-current power supply does not need to be regulated for multiple times, and the device has wide applicability. In addition, the device can simultaneously perform steady-state operation tests on the two converter valves, and the efficiency of the steady-state operation tests is greatly improved.
In the present embodiment, the circuits of the first resonant circuit 101, the second resonant circuit 102, the pressure-bearing circuit 103, the hvdc power source 104, the first sample valve 105 and the second sample valve 106 are merely examples, and are not limited thereto.
Fig. 2 is a circuit diagram of a steady-state operation test device for a flexible direct current converter valve according to an embodiment of the present invention, where, as shown in fig. 2, a first resonant circuit includes a first inductor L0 and a first capacitor C0.
The first end of the first capacitor C0 is connected with a high-voltage direct-current power supply, and the second end of the first capacitor C0 is connected with the input end of the pressure-bearing circuit; the first end of the first inductor L0 is connected with a high-voltage direct-current power supply, and the second end of the first inductor L0 is connected with the input end of the pressure-bearing circuit; the resonance frequency of the first resonance circuit is the rated frequency preset by the first sample valve and the second sample valve.
Illustratively, a first end of a first capacitor C0 in the first resonant circuit is connected to a first end of a first inductor L0, a second end of the first capacitor C0 is connected to a second end of the first inductor L0, that is, the first capacitor C0 and the first inductor L0 are in a parallel relationship, and a resonant frequency of the first resonant circuit is set to rated operating frequencies of the first sample valve and the second sample valve. The first resonant circuit (parallel resonant circuit) composed of the first capacitor C0 and the first inductor L0 isolates alternating current components in the first sample valve and the second sample valve from direct current components in the high-voltage direct current power supply, so that current ripple of the high-voltage direct current power supply is effectively reduced, and the high-voltage direct current power supply can stably supply power to power modules in the first sample valve and the second sample valve without being influenced. And the control flow in the steady-state operation test is obviously simplified, and the complexity of the steady-state operation test is reduced.
It should be noted that, the structure of the first resonant circuit in the foregoing embodiment is an exemplary illustration of the embodiment of the present invention, and in other embodiments of the present invention, the first resonant circuit may also include resonant circuits of other elements, which is not limited herein.
In some embodiments of the invention, the second resonant circuit includes a second inductance L2 and a second capacitance C2, as illustrated by way of example in fig. 2.
The first end of the second capacitor C2 is connected with the first sample valve, and the second end of the second capacitor C2 is connected with the first end of the second inductor L2; the second end of the second inductor L2 is connected with a second sample valve; the resonance frequency of the second resonance circuit is the rated frequency preset by the first sample valve and the second sample valve.
Illustratively, the second end of the second capacitor C2 is connected to the first end of the second inductor L2, that is, the second capacitor C2 and the second inductor L2 are in a series relationship, and the resonant frequency of the second resonant circuit is set to the rated operating frequencies of the first sample valve and the second sample valve. A second resonance circuit (series resonance circuit) is constituted by the second capacitor C2 and the second inductance L2 so that the voltage drop of the circuit connected between the first sample valve and the second sample valve becomes small. The second resonance circuit has little influence on the port voltages of the first sample valve and the ground two sample valves to the ground, so that the two sample valves can simultaneously perform steady-state operation tests, and the two sample valves performing the tests can meet the type test standard, thereby improving the efficiency of the steady-state operation tests.
It should be noted that, the structure of the second resonant circuit in the above embodiment is an exemplary illustration of the embodiment of the present invention, and in other embodiments of the present invention, the second resonant circuit may also include resonant circuits of other elements, which is not limited herein.
In some embodiments of the invention, the tank circuit includes a third inductance L11 and a fourth inductance L12, as illustrated by way of example in fig. 2.
The first end of the third inductor L11 is connected with the first end of the first sample valve and the first end of the second resonant circuit respectively, and the second end of the third inductor L11 is connected with the second end of the first resonant circuit; the first end of the fourth inductor L12 is connected with the second end of the first resonant circuit, and the second end of the fourth inductor L12 is connected with the second sample valve and the second end of the second resonant circuit respectively.
The third inductor L11 and the fourth inductor L12 are symmetrically arranged in the circuit, the third inductor L11 and the fourth inductor L12 are respectively connected with the first sample valve and the second sample valve, and when the direct current output by the first resonant circuit passes through the third inductor L11 and the fourth inductor L12, the voltage drop of the direct current flowing out becomes very small, so that the direct current flowing into the first sample valve and the second sample valve meets the type test standard requirement.
It should be noted that the structure of the voltage-bearing circuit in the above embodiment is an exemplary description of the embodiment of the present invention, and in other embodiments of the present invention, the voltage-bearing circuit may also include voltage-bearing circuits of other elements, which is not limited herein.
In some embodiments of the invention, the high voltage dc power supply includes an uncontrolled rectifier bridge, an adjustable transformer, an ac power supply, as illustrated by way of example in fig. 2.
One end of the alternating current power supply is grounded, and the other end of the alternating current power supply is connected with the input end of the adjustable transformer; the output end of the adjustable transformer is connected with the input end of the uncontrolled rectifier bridge; the grounding end of the uncontrolled rectifier bridge is grounded, and the output end of the uncontrolled rectifier bridge is connected with the first end of the first resonant circuit.
The uncontrolled rectifier bridge uses six diodes to rectify the input voltage so as to make the current waveform output by the uncontrolled rectifier bridge smooth. The adjustable transformer changes the alternating voltage and current with a certain value into another voltage and current with the same frequency or different values.
The ac power supply inputs ac voltage with a certain value into the adjustable transformer, and the adjustable transformer processes the input ac voltage and then transmits the processed ac voltage to the uncontrolled rectifier bridge, and the uncontrolled rectifier bridge rectifies the voltage, so as to provide smooth dc voltage for the steady-state operation test circuit.
The direct current voltage in the steady-state operation test is not changed generally, and is generally equal to the sum of capacitance voltages of the sample valves participating in the test.
It should be noted that, the structure of the dc power supply in the above embodiment is an exemplary illustration of the embodiment of the present invention, and in other embodiments of the present invention, the dc power supply may also include other elements, which is not limited herein.
In some embodiments of the invention, the exemplary, high voltage dc power supply further includes a switch, as shown in fig. 2.
The first end of the switch is connected with the adjustable transformer, and the second end of the switch is connected with the output end of the alternating current power supply.
The switch is arranged in the steady-state operation test device of the flexible direct-current converter valve, so that a tester can control whether the steady-state operation test works or not, the safety of arrangement can be ensured, and energy sources can be saved.
The invention is by way of example only and the form of the switch is not limited.
In some embodiments of the present invention, as illustrated in fig. 2, the first sample valve and the second sample valve each include a plurality of power modules connected in series.
As shown in fig. 2, a plurality of power modules are connected in series in one sample valve, specifically, a first end of a first power module in a first sample valve is connected with a first end of a third inductor L11, a second end of a last power module in the first sample valve is grounded, and ports of the other power modules are connected in series one by one.
It should be noted that the structure of the sample valve in the above embodiment is an exemplary description of the embodiments of the present invention, and in other embodiments of the present invention, the sample valve may be formed by other types of power modules in a certain form, and the present invention is not limited herein.
In some embodiments of the invention, the power module may be a half bridge power module or a full bridge power module, as illustrated by way of example in fig. 2. The structure and working principle of the full-bridge power module and the half-bridge power module are well known to those skilled in the art, and the embodiments of the present invention are not described herein again.
The input or the cut-out of the power module is controlled by controlling the on or the off of an insulated gate bipolar transistor in the trigger power module, so that the sample valve outputs the required voltage.
The present invention is by way of example only and is not limited thereto.
Example two
Fig. 3 is a flowchart of a steady-state operation test method of a flexible dc converter valve according to a second embodiment of the present invention, where the present embodiment may be adapted to improve the efficiency of a steady-state operation test of a sample valve, and the method may be performed by a steady-state operation test device of a flexible dc converter valve, and specifically includes the following steps:
the charging phase is carried out before the test begins:
step 201, the adjustable transformer in the high-voltage direct-current power supply is adjusted to output zero voltage.
And (3) regulating the adjustable transformer of the high-voltage direct-current power supply to output of 0, namely initializing a steady-state operation test circuit of the flexible direct-current converter valve.
The present embodiment is merely an example and is not limited thereto.
Step 202, the high-voltage direct current power supply slowly boosts until the voltage of the current high-voltage direct current power supply is the preset rated direct current voltage, and the capacitor voltage of the power module in the first sample valve and the capacitor voltage of the power module in the second sample valve reach half of the preset rated capacitor voltage.
The adjustable transformer is adjusted, so that the high-voltage direct-current power supply is slowly boosted until the voltage of the high-voltage direct-current power supply is a preset rated direct-current voltage; the capacitor voltage of the power module in the first sample valve and the capacitor voltage of the power module in the second sample valve reach half of the preset rated capacitor voltage, so that the direct current component accords with the type test specification. At this time, the power modules in the first sample valve and the second sample valve are connected in series to share the voltage from the high-voltage direct-current power supply. The rated direct current voltage is the sum of rated capacitor voltages of all power modules in one sample valve.
In the foregoing embodiments, the capacitor voltage of the power module achieved by the first sample valve and the second sample valve is an exemplary illustration of the embodiments of the present invention, and in other embodiments of the present invention, the first sample valve and the second sample valve may reach other predetermined capacitor voltage values after the boost of the dc power supply, which is not limited herein.
In some embodiments of the invention, after the charging phase of the first and second sample valves is completed, the method further comprises the steps of:
step 203, the first sample valve and the second sample valve unlock all the power modules, so that the power modules enter a working state.
And changing the specific insulated gate bipolar transistors in all the power modules in the first sample valve and the second sample valve into a conducting state so as to unlock the power modules, wherein all the power modules are put into operation.
The present embodiment is merely an example and is not limited thereto.
Step 204, the first sample valve and the second sample valve slowly reduce the input power modules until the number of the input power modules is half of the total number of the power modules.
And changing the insulated gate bipolar transistors in part of the power modules in the first sample valve and the second sample valve into an off state so as to reduce the input power modules until the number of the power modules is half of the total number of the original power modules, wherein the capacitor voltage of all the power modules in the first sample valve and the second sample valve reaches the preset rated capacitor voltage.
The embodiment is only used for illustrating the operation process of the input power module in the steady-state operation test, and is not limited.
Step 205, sinusoidal modulation signals are respectively added to the first sample valve and the second sample valve to control the current in the first sample valve and the second sample valve to be a preset current specified value.
And adding alternating current components meeting the type test specification into the first sample valve and the second sample valve, and exemplarily, respectively adding sinusoidal modulation signals into the first sample valve and the second sample valve to enable the current in the first sample valve and the second sample valve to be a preset current specified value so as to perform steady-state operation test on the sample valve and check whether the sample valve can perform steady-state operation.
The present embodiment is merely an example, and the generation process of the sinusoidal modulation signal is not limited.
It should be noted that, for simplicity of description, the method embodiments are shown as a series of acts, but it should be understood by those skilled in the art that the embodiments are not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred embodiments, and that the acts are not necessarily required by the embodiments of the invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (7)
1. The steady-state operation test device for the flexible direct-current converter valve is characterized by comprising a first resonant circuit, a second resonant circuit, a pressure-bearing circuit, a high-voltage direct-current power supply, a first sample valve and a second sample valve;
the first end of the first resonant circuit is connected with the high-voltage direct current power supply, the second end of the first resonant circuit is connected with the input end of the pressure-bearing circuit, the first output end and the second output end of the pressure-bearing circuit are respectively connected with the first sample valve and the second sample valve, the first end of the second resonant circuit is connected with the first output end of the pressure-bearing circuit, and the second end of the second resonant circuit is connected with the second output end of the pressure-bearing circuit;
the first resonant circuit comprises a first inductor and a first capacitor;
the first end of the first capacitor is connected with the high-voltage direct-current power supply, and the second end of the first capacitor is connected with the input end of the pressure-bearing circuit;
the first end of the first inductor is connected with the high-voltage direct-current power supply, and the second end of the first inductor is connected with the input end of the pressure-bearing circuit;
the resonance frequency of the first resonance circuit is the rated frequency preset by the first sample valve and the second sample valve;
the second resonant circuit comprises a second inductor and a second capacitor;
the first end of the second capacitor is connected with the first sample valve, and the second end of the second capacitor is connected with the first end of the second inductor;
the second end of the second inductor is connected with the second sample valve;
and the resonance frequency of the second resonance circuit is the rated frequency preset by the first sample valve and the second sample valve.
2. The apparatus of claim 1, wherein the voltage-bearing circuit comprises a third inductance and a fourth inductance;
the first end of the third inductor is connected with the first end of the first sample valve and the first end of the second resonant circuit respectively, and the second end of the third inductor is connected with the second end of the first resonant circuit;
the first end of the fourth inductor is connected with the second end of the first resonant circuit, and the second end of the fourth inductor is respectively connected with the second sample valve and the second end of the second resonant circuit.
3. The apparatus of claim 1, wherein the high voltage dc power source comprises an uncontrolled rectifier bridge, an adjustable transformer, an ac power source;
one end of the alternating current power supply is grounded, and the other end of the alternating current power supply is connected with the input end of the adjustable transformer;
the output end of the adjustable transformer is connected with the input end of the uncontrolled rectifier bridge;
the grounding end of the uncontrolled rectifier bridge is grounded, and the output end of the uncontrolled rectifier bridge is connected with the first end of the first resonant circuit.
4. The apparatus of claim 3, wherein the high voltage dc power supply further comprises a switch;
the first end of the switch is connected with the adjustable transformer, and the second end of the switch is connected with the output end of the alternating current power supply.
5. The apparatus of claim 4, wherein the first and second sample valves each comprise a plurality of power modules connected in series.
6. The apparatus of claim 5, wherein the power module is a half-bridge power module or a full-bridge power module.
7. A method for testing steady-state operation of a flexible direct current converter valve, characterized in that, based on the device for testing steady-state operation of a flexible direct current converter valve according to claim 6, a charging phase is provided before the test starts, and the charging phase comprises:
regulating an adjustable transformer in the high-voltage direct-current power supply to output zero voltage;
the high-voltage direct-current power supply is slowly boosted until the voltage of the current high-voltage direct-current power supply is the preset rated direct-current voltage, and the capacitor voltage of the power module in the first sample valve and the capacitor voltage of the power module in the second sample valve reach half of the preset rated capacitor voltage;
after the charging stage is completed, the first sample valve and the second sample valve unlock all the power modules so that the power modules enter a working state;
the first sample valve and the second sample valve slowly reduce the input power modules until the number of the input power modules is half of the total number of the power modules;
sinusoidal modulation signals are respectively added to the first sample valve and the second sample valve to control the current in the first sample valve and the second sample valve to be a preset current specified value so as to perform steady-state operation tests on the first sample valve and the second sample valve, and whether the first sample valve and the second sample valve can perform steady-state operation is checked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111464273.8A CN114167272B (en) | 2021-12-03 | 2021-12-03 | Flexible direct current converter valve steady-state operation test device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111464273.8A CN114167272B (en) | 2021-12-03 | 2021-12-03 | Flexible direct current converter valve steady-state operation test device and method |
Publications (2)
| Publication Number | Publication Date |
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