A full compensation tracking compensation method of controllable voltage source based on fault phase-to-phase voltage
A compensation tracking and phase voltage technology, which is applied in the field of electric power system, can solve problems such as grounding residual current at the grounding point, and achieve the effect of preventing electric shock risk, small current residual, and simple tracking compensation method
Active Publication Date: 2020-10-30
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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[0003] This application provides a controllable voltage source full compensation tracking compensation method based on the phase-to-phase voltage of the fault to solve the problem that the system can operate with faults, but there is still a certain grounding residual current at the grounding point, and there is still a risk of personal electric shock
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[0012] The method of this application can be applied in the ground current full compensation circuit of the controllable voltage source, see figure 1 , the application provides a controllable voltage source full compensation tracking compensation method based on fault phase-to-phase voltage, the method includes:
[0013] Step 11: When a single-phase-to-ground fault occurs in the distribution network system, control the controllable voltage source to initially compensate the target voltage for voltage compensation.
[0014] Step 12: Obtain the effective value of the phase voltage of the ground phase.
[0015] Step 13: According to the effective value of the phase voltage of the ground phase, it is judged whether the single-phase ground fault current is eliminated, and if the ground fault current is not eliminated, perform step 14.
[0016] Specifically, if the effective value of the phase voltage of the ground phase is within a preset effective value range, the single-phase gr...
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The invention provides a fault phase voltage-based full-compensation tracing compensation method of a controllable voltage source. After a single-phase grounding fault occurs in a power distribution network system, the controllable voltage source outputs a certain compensation target voltage for grounding current compensation, a phase angle and amplitude of the compensation target voltage are constantly adjusted, an effective value of a fault phase voltage approximate to 0, and the purpose of full compensation on a grounding point current is finally achieved; and moreover, the grounding pointcurrent is relatively small in residual, an electric shock risk is prevented, and a rapid, effective, simple and convenient tracing compensation method is provided for achieving full compensation on the grounding current of the controllable voltage source.
Description
technical field [0001] The present application relates to the technical field of electric power systems, and in particular to a tracking compensation method for full compensation of controllable voltage sources based on faulty phase-to-phase voltages. Background technique [0002] In the power grid system, especially in the medium and low voltage distribution network system, the single-phase ground fault accounts for the absolute majority of the total number of faults. The neutral point grounding methods of the medium and low voltage distribution network mainly include the neutral point non-grounding method, the neutral point grounding method through the arc suppression coil or the neutral point grounding method through a low-value resistance. In the neutral point ungrounded mode, the ground current is not compensated and operates with a fault, which poses a risk of personal electric shock. When the neutral point is grounded through the arc-suppression coil, the arc-suppres...
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IPC IPC(8): H02H9/08
Inventor 刘红文王科柴晨超杨庆
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST