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Reactive power control method for high-voltage direct current transmission system under low-power running condition

A technology for power transmission systems and operating conditions, applied in reactive power compensation, AC network voltage adjustment, etc., can solve the problems of DC current increase, harmonic current increase, frequent switching of AC filters, etc., to avoid frequent switching. Effect

Active Publication Date: 2014-04-02
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the AC bus voltage of the converter station is high, the DC field operates in step-down mode during low-load start-up, the ignition angle increases, and the DC current increases, so that the harmonic current increases accordingly, and the harmonic performance requirements may be put into the AC filter In the small group, the AC bus voltage may exceed the limit value of the AC bus voltage after the input, and the AC bus voltage will cut off the AC filter, resulting in frequent switching of the AC filter

Method used

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  • Reactive power control method for high-voltage direct current transmission system under low-power running condition
  • Reactive power control method for high-voltage direct current transmission system under low-power running condition
  • Reactive power control method for high-voltage direct current transmission system under low-power running condition

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Embodiment

[0024] According to the current operating power level, the pole control selects the appropriate DC voltage to operate, and through the step-down method, increases the ignition angle of the converter, increases the reactive power consumption, and reduces the reactive power provided to the system, so as to adjust the AC field voltage in a suitable range . During the period of low-load reactive power optimization, the DC station controller inputs the AC filter according to the DC current in the step-down mode.

[0025] Please refer to figure 2 As shown, a reactive power control method for low-power operation of a high-voltage direct current transmission system, which mainly involves a reactive power control method suitable for low-power operation of a direct current transmission system, which includes the following steps:

[0026] S101. Before putting in the AC filter, obtain the short-circuit capacity of the converter station, the rated capacity of the AC filter, and the dynam...

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Abstract

The invention discloses a reactive power control method for a high-voltage direct current transmission system under the low-power running condition. The method comprises the following steps of 1, acquiring the short circuit capacity of a converter station, the rated capacity of an alternating current filter, a dynamic reactive value after the alternating current filter is switched in, and alternating current bus voltage variation after the alternating current filter is switched in; 2, if the sum of current alternating current bus voltage and the alternating current bus voltage variation after the alternating current filter is switched in is smaller than an alternating current bus voltage limit value, executing a step 3, otherwise, executing a step 4; 3, switching in the alternating current filter; 4, calculating a maximum allowable load current value according to the switched-in alternating current filter, if a current measured direct current value is smaller than the maximum allowable load current value, inhibiting switching in a next alternating current filter group, otherwise, increasing direct current transmission power or automatically converting the reactive power control method into a manual control mode. By the method, the frequent switch-in of the alternating current filter can be avoided.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a coordinated control method for harmonic performance and voltage control under the condition of low-power operation of a high-voltage direct current transmission system. Background technique [0002] The HVDC power transmission system generally adopts the system reactive power control mode, and the control priority of the reactive power mode is lower than that of the harmonic performance. When the harmonic performance prohibits the removal of the AC filter, the AC filter will not be cut even if the reactive power exceeds the limit. That is, it will not cause frequent switching of the AC filter. When the converter station system is weak, the voltage control mode can also be selected, but the harmonic performance and voltage control have no priority, and they work separately. When the AC bus voltage of the converter station is high, the DC field operates in step-do...

Claims

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Application Information

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IPC IPC(8): H02J3/16
CPCY02E40/34Y02E40/30
Inventor 王振冯鸫彭德辉戴国安郭宏光
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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