CN110286273B - Test circuit and method for voltage response test under rated current of thyristor converter - Google Patents
Test circuit and method for voltage response test under rated current of thyristor converter Download PDFInfo
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- CN110286273B CN110286273B CN201910408421.0A CN201910408421A CN110286273B CN 110286273 B CN110286273 B CN 110286273B CN 201910408421 A CN201910408421 A CN 201910408421A CN 110286273 B CN110286273 B CN 110286273B
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Abstract
The invention discloses a test circuit and a test method for a voltage response test of a thyristor converter under rated current. The invention utilizes the principle that the current of the converter rises when positive voltage is applied and falls when negative voltage is applied, firstly utilizes current closed-loop control to ensure that the converter stably runs at 80 percent of rated current, and then controls the output current of the converter to reach the rated value in the process of applying full voltage to carry out voltage response, thereby realizing the test of detecting the voltage response characteristic of the converter under the rated current.
Description
Technical Field
The invention relates to the technical field of thyristor converter testing, in particular to a testing circuit and a testing method for a voltage response test of a thyristor converter under rated current.
Background
ITER (International thermonuclear fusion Experimental reactor) is the superconducting Tokamak device which has the largest and most profound influence in the world at present. An ITER polar field converter unit is an important subsystem of magnetic confinement fusion reactor engineering, is powered by a 66kV bus of a pulse power supply system, and transmits controllable direct-current voltage to a polar field superconducting coil for plasma breakdown and plasma current configuration control.
Each polar field converter unit consists of four thyristors and six pulse wave converters and can perform 12-pulse wave and four-quadrant operation. Each six-pulse-wave converter can output rated current of 27.5kA and rated on-load voltage of 1.05 kV. According to the ITER system requirement, when the input voltage of the rectifier transformer varies in the range of 62 kV-72 kV, the polar field converter should have a symmetric voltage response that achieves full range variation of voltage (± 1.05kV) in a time not exceeding 2 cycles (40ms), and requires the symmetric voltage response of the converter to be detected at rated current.
In order to meet the ITER requirement, a detection method of firstly carrying out current closed loop and then carrying out voltage open loop control is provided for an ITER polar field converter voltage response test, the converter is enabled to operate under 0.8 times of rated current by utilizing the current closed loop control, the response condition of the converter in the full voltage range is detected by utilizing the voltage open loop, and the output current of the converter can reach the rated value in the voltage step change process.
A testing method for a voltage response test of a thyristor converter under rated current is important for testing the voltage response characteristic of the ITER converter under rated current.
Disclosure of Invention
The invention aims to make up for the defects of the prior art and provides a test circuit and a test method for a voltage response test of a thyristor converter under a rated current.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the test circuit for voltage response test of thyristor converter under rated current includes autotransformer T1Breaker CB, alternating-current isolating switch AS, grounding switch ES and rectifier transformer T2Thyristor converter CU to be tested, controller C, direct-current reactor L, direct-current isolating switch DS and load LdSaid auto-coupling transformerPressure device T1The input end of the autotransformer T1 is connected with a 110kV power grid, and the output end of the autotransformer T1 is connected to the rectifier transformer T sequentially through the circuit breaker CB and the alternating current isolating switch AS2Input terminal of, rectifier transformer T2The output end of the DC-DC converter is connected with the input end of the thyristor converter CU, and the DC reactor L, the DC isolating switch DS and the load LdThe controller C is connected between the positive output end and the negative output end of the thyristor six-pulse-wave converter CU in series, and the controller C is connected with the control end of the thyristor six-pulse-wave converter CU through an analog signal port.
And the controller C controls the operation of the thyristor converter CU according to the reference waveform requirement.
A testing method for a voltage response test of a thyristor converter under rated current comprises the following steps:
(1) firstly, a current closed-loop control mode is adopted, the thyristor converter CU is enabled to stably operate under 80% of rated current, then the control mode is switched into voltage open-loop control, and in the voltage response process, the output current of the thyristor converter CU reaches the rated value;
(2) in voltage open-loop control, positive and negative maximum voltages should be applied 2 times each to detect the symmetrical voltage response of the full range of voltage variation;
(3) according to the system parameters, loop parameters and load parameters of the test circuit, calculating the time for applying positive voltage and negative voltage during voltage open-loop control, and the time t for applying positive voltage1The negative voltage application time t depends on the time when the output current of the thyristor six-pulse current transformer CU rises from 80 percent of rated current to rated current2Depending on the time when the output current of the thyristor six-pulse current transformer CU drops from the rated current to a certain current value, the time t when the positive voltage is applied again3Depending on the time when a certain current value rises to the rated current again, the time for applying the negative voltage again is not limited, and the output current of the thyristor converter CU is reduced to 0, namely the thyristor converter CU stops working;
(4) the controller adopts a CSS operation interface, and sets a converter operation Mode and a control Mode thereof in a Set Mode window of the CSS operation interface, wherein a combination Mode represents a hybrid control Mode which can realize current control and voltage control; presetting a test waveform in a Preset waveform window of a CSS operation interface, wherein if CB Mode is 1, the Preset waveform is current control, and if CB Mode is 2, the Preset waveform is voltage control;
(5) the test is started by comparing preset reference waveforms in real time and adopting a control mode of first current closed-loop control and then voltage open-loop control;
(6) real-time detection of output current IdLet a t0Setting t for the time of steady-state operation of the converter under 80% rated current0In order to ensure that the converter enters steady-state operation, the current closed-loop control is changed into voltage open-loop control, voltage step response is carried out, and after 80% of rated current of the converter CU is reached, timing is reached to t0Switching the current closed-loop control into a voltage open-loop control mode according to time t1Applying a positive maximum voltage to cause an output current IdRated current of the converter CU is achieved; the voltage being stepped from a positive maximum to a negative maximum and being timed by time t2Maintaining a negative maximum voltage to output a current IdDropping to a certain current value; the voltage is stepped from a negative maximum to a positive maximum again at a time t3Maintaining a positive maximum voltage to output a current IdAfter the rated current of the converter CU is reached; maintaining the negative maximum voltage again until the converter CU outputs the current IdAnd (5) reducing to 0, stopping the operation of the control program and ending the test.
The invention has the advantages that: before the voltage response, controlling the converter to stably operate at 80% of rated current; by utilizing the principle that the current of the converter with the positive voltage is increased and the current of the converter with the negative voltage is decreased, the output current of the converter is controlled to reach the rated current in the process of applying the full voltage to carry out voltage response, so that the test for detecting the voltage response characteristic of the converter under the rated current is realized.
Drawings
Fig. 1 is a test circuit for voltage response test of a thyristor converter.
Fig. 2 is a circuit topology of a thyristor converter.
Fig. 3 is a schematic diagram of a control circuit.
FIG. 4 is a block diagram of a method of the present invention.
FIG. 5 is an operation interface of the preset reference waveform.
Fig. 6 is a preset reference waveform of the voltage response test.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in FIG. 1, a test circuit for voltage response test of thyristor converter under rated current comprises an autotransformer T1Breaker CB, alternating-current isolating switch AS, grounding switch ES and rectifier transformer T2Converter CU and controller C, direct current reactor L, direct current isolating switch DS and load L thereofdSaid autotransformer T1The input end of the rectifier is connected with a 110kV power grid, and the output end of the rectifier is connected to a rectifier transformer T through a circuit breaker CB and an alternating current isolating switch AS2Input terminal of, rectifier transformer T2The output end of the DC reactor is connected with a current transformer CU, the DC reactor L, the DC isolating switch DS and the load LdAnd the series connection is formed between the positive output end and the negative output end of the current transformer CU. The controller C controls the operation of the thyristor converter CU according to the reference waveform requirements.
The autotransformer T1The rated capacity of the transformer is 100MVA, the transformation ratio is 110 kV/80-12 kV, and the autotransformer is in a 110kV/62kV gear position in the test. The rectifier transformer T2Has a rated capacity of 41MVA and a transformation ratio of 66kV/1.05 kV. The inductance value of the direct current reactor L is 250 muH, and the resistance value is 300 muomega. The load LdThe inductance value of (2) was 5mH, and the resistance value was 2.5 m.OMEGA..
The converter CU is a three-phase bridge type fully-controlled rectifying circuit composed of thyristors, as shown in figure 2, and is composed of 6 bridge arms, each bridge arm is formed by connecting 12 thyristor branches in parallel, and each thyristor branch is connected with a fast fuse in series. a. b and c are three-phase alternating current input terminals, g is a control signal input terminal, and the plus and minus respectively represent a direct current positive output terminal and a direct current negative output terminal of the converter.
The controller C adopts an autonomously developed DSP controller (TMS320F2812), and as shown in fig. 3, its input is a synchronous signal of the input voltage of the rectifier transformer, and its output 6 control signals are respectively connected to the thyristor control signal input terminals g of the 6 arms of the converter CU after passing through the operational amplifier.
As shown in fig. 4, a method for testing voltage response test of a thyristor converter under rated current includes the following steps:
(1) firstly, current closed-loop control is utilized to enable the converter CU to stably operate for 180ms under the current of 22kA, the control mode is switched from the current closed-loop control to voltage open-loop control, and in the process of full-voltage response, the output current of the converter CU reaches 27.5 kA;
(2) in voltage open loop control, positive and negative maximum voltages should be applied 2 times each to detect a symmetrical voltage response over the full range of voltage variation.
(3) According to the system parameters, loop parameters and load parameters of the test circuit, calculating the time for applying positive voltage and negative voltage during voltage open-loop control, and the time t for applying positive voltage1Depending on the time it takes for the converter CU output current to rise from 22kA to 27.5 kA; time t of applying negative voltage2Depending on the time required for the converter CU output current to drop from 27.5kA to 15 kA; time t of re-applying positive voltage3Depending on the time it takes for the converter output current to rise again from 15kA to 27.5 kA; and (5) applying the negative voltage again until the output current of the converter CU is reduced to 0, stopping the operation of the control program, and ending the test. Calculating the time t of applying positive voltage for the first time based on the system parameters, loop parameters and load parameters of the integrated test platform of the high-power electrical test center of the plasma physical research institute1At 25ms, a first application of negative voltage for a time t2At 75ms, the voltage is applied again for a time t3Is 80 ms.
(4) The controller adopts a CSS (control system studio) operation interface, and information such as a converter operation mode (a single-bridge, parallel or four-quadrant operation mode), a control mode (a current control mode, a voltage control mode and a hybrid control mode), PID (proportion integration differentiation) parameters of feedback control, a preset test waveform, an AC/DC isolating switch state and the like can be set on the CSS operation interface. Both Set Mode window and Preset waveform window are visible on the CSS operating interface.
In the CSS operating interface of the controller, Ctrl Mode of the Set Mode window selects the combined control Mode (combination Mode), a Preset test waveform in the Preset waveform window thereof is shown in fig. 5, where the time(s) column indicates time (in units of s), PresetV indicates a Preset value, and if CB Mode is 1, the Preset PresetV value is current (in units of a), and if CB Mode is 2, the Preset PresetV value is voltage (in units of V). Referring to FIG. 6, the control interface is preset with a test waveform as shown in FIG. 5, where t0Is 180ms, t1Is 25ms, t2Is 75ms, t380ms, 80% Idn 22000A, UmIs 1050V, -Umis-1050V.
(5) The test is started by comparing preset reference waveforms in real time and adopting a control mode of first current closed-loop control and then voltage open-loop control;
(6) real-time detection of output current IdWhen the current reaches 22kA, timing is started, the current closed-loop control is changed into voltage open-loop control for timing 180ms, and the positive maximum voltage is applied for 25ms to output the current IdUp to 27.5 kA; the voltage is stepped from the positive maximum value to the negative maximum value, and the negative maximum voltage is maintained for 75ms, so that the output current IdDown to 15 kA; the voltage is stepped from the negative maximum value to the positive maximum value, and the positive maximum voltage is maintained for 80ms again, so that the output current IdUp to 27.5 kA; maintaining the negative maximum voltage again until the converter CU outputs the current IdAnd (5) reducing to 0, stopping the operation of the control program and ending the test.
Claims (2)
1. A test method of a test circuit based on a voltage response test under rated current of a thyristor converter is characterized by comprising the following steps: the test circuit for voltage response test under rated current of thyristor converter comprises an autotransformer T1Breaker CB, alternating-current isolating switch AS, grounding switch ES and rectifier transformer T2Thyristor converter CU to be tested, controller C, direct-current reactor L, direct-current isolating switch DS and load LdSaid autotransformer T1Input terminal of 1The output end of the autotransformer T1 is connected to the rectifier transformer T sequentially through the circuit breaker CB and the alternating current isolating switch AS in the 10kV power grid2Input terminal of, rectifier transformer T2The output end of the DC-DC converter is connected with the input end of the thyristor converter CU, and the DC reactor L, the DC isolating switch DS and the load LdThe controller C is connected between the positive output end and the negative output end of the thyristor six-pulse-wave converter CU in series, and is connected with the control end of the thyristor six-pulse-wave converter CU through an analog signal port;
the testing method of the testing circuit based on the voltage response test under the rated current of the thyristor converter comprises the following steps:
(1) firstly, a current closed-loop control mode is adopted, the thyristor converter CU is enabled to stably operate under 80% of rated current, then the control mode is switched into voltage open-loop control, and in the voltage response process, the output current of the thyristor converter CU reaches the rated value;
(2) in voltage open-loop control, positive and negative maximum voltages should be applied 2 times each to detect the symmetrical voltage response of the full range of voltage variation;
(3) according to the system parameters, the loop parameters and the load parameters of the test circuit of the voltage response test under the rated current of the thyristor converter, the time of applying positive voltage and negative voltage during the open-loop control of the voltage is calculated, and the time t of applying positive voltage is calculated1The negative voltage application time t depends on the time when the output current of the thyristor six-pulse current transformer CU rises from 80 percent of rated current to rated current2Depending on the time when the output current of the thyristor six-pulse current transformer CU drops from the rated current to a certain current value, the time t when the positive voltage is applied again3Depending on the time when a certain current value rises to the rated current again, the time for applying the negative voltage again is not limited, and the output current of the thyristor converter CU is reduced to 0, namely the thyristor converter CU stops working;
(4) the controller adopts a CSS operation interface, and sets a converter operation Mode and a control Mode thereof in a Set Mode window of the CSS operation interface, wherein a combination Mode represents a hybrid control Mode which can realize current control and voltage control; presetting a test waveform in a Preset waveform window of a CSS operation interface, wherein if CB Mode is 1, the Preset waveform is current control, and if CB Mode is 2, the Preset waveform is voltage control;
(5) the test is started by comparing preset reference waveforms in real time and adopting a control mode of first current closed-loop control and then voltage open-loop control;
(6) real-time detection of output current IdLet a t0Setting t for the time of steady-state operation of the converter under 80% rated current0In order to ensure that the converter enters steady-state operation, the current closed-loop control is changed into voltage open-loop control, voltage step response is carried out, and after 80% of rated current of the converter CU is reached, timing is reached to t0Switching the current closed-loop control into a voltage open-loop control mode according to time t1Applying a positive maximum voltage to cause an output current IdRated current of the converter CU is achieved; the voltage being stepped from a positive maximum to a negative maximum and being timed by time t2Maintaining a negative maximum voltage to output a current IdDropping to a certain current value; the voltage is stepped from a negative maximum to a positive maximum again at a time t3Maintaining a positive maximum voltage to output a current IdAfter the rated current of the converter CU is reached; maintaining the negative maximum voltage again until the converter CU outputs the current IdAnd (5) reducing to 0, stopping the operation of the control program and ending the test.
2. The method for testing the test circuit of the voltage response test of the thyristor converter under the rated current according to claim 1, wherein the method comprises the following steps: and the controller C controls the operation of the thyristor converter CU according to the reference waveform requirement.
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