Grounding fault full compensation method for controllable current source with inductance compensation
A technology for compensating current and grounding faults, applied in the field of power systems, can solve problems such as electric shock, and achieve the effects of simple system structure, strong stability, and easy control
Active Publication Date: 2019-05-28
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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[0003] This application provides a ground fault full compensation method of a controllable current source with inductance compensation to solve the problem that the arc suppression coil can only compensate reactive current, and there is still ground residual current after compensation, because the residual current contains certain overcompensation induction current and Active current, there is still the problem of electric shock risk
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[0014] The method of this application can be used for figure 1 In the circuit shown, the circuit includes A-phase power supply Ua, B-phase power supply Ub, C-phase power supply Uc, switch K and controllable voltage source U0, A-phase power supply Ua, B-phase power supply Ub and The C-phase power supply Uc is distributed in positive sequence.
[0015] Phase A phase power supply Ua and corresponding single-phase ground distribution impedance Z C connected to form a phase A phase power supply branch; B phase phase power supply Ub and the corresponding single-phase ground distribution impedance Z C Connect to form B-phase phase power supply branch; C-phase phase power supply Uc and corresponding single-phase ground distributed impedance Z C connected to form a C-phase power supply branch.
[0016] A-phase power supply branch, B-phase power supply branch, C-phase power supply branch, controllable current source Ik and compensation inductive reactance Z between neutral point and ...
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The invention provides a grounding fault full compensation method for a controllable current source with inductance compensation. When a single-phase grounding fault happens to a power distribution network system, a compensation inductor compensates for a grounding capacitive current, and the controllable current source compensates for a grounding residual current, thereby avoiding the full compensation of the grounding current, and protecting a person from being electrically shocked. Moreover, the system is simple in structure, the control is easy to control and the stability is high. The method provides a principle calculation method and a control method for grounding fault current full compensation engineering application based on the controllable current source, and a controllable current source full compensation device can be developed on the basis of the grounding fault current full compensation system.
Description
technical field [0001] The present application relates to the field of power systems, in particular to a method for fully compensating ground faults of a controllable current source with inductance compensation. Background technique [0002] my country's low-voltage distribution network generally adopts small current grounding methods, including the neutral point ungrounded method or the neutral point grounded method through the arc suppression coil. When the neutral point is not grounded, the grounding arc cannot be extinguished by itself, and the safety of personnel and operation cannot be guaranteed. When the neutral point is grounded through the arc-suppression coil, the grounding arc can be partially extinguished by itself due to the reactive current compensated by the arc-suppression coil, but the arc-suppression coil can only compensate for the reactive current, and there is still a grounding residual current after compensation. The residual current includes a certai...
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IPC IPC(8): H02H9/08
Inventor 刘红文王科张恭源赵现平
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST