A Control Method of Controllable Current Source Grounding Full Compensation with Inductance Compensation
A control method and current source technology, applied in the field of power systems, can solve problems such as grounding residual current, achieve the effects of easy control, simple system structure, and avoid contact risks
Active Publication Date: 2020-04-24
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology
[0003] This application provides a control method for full compensation of the grounding of a controllable current source with inductance compensation to solve the problem that the grounding arc is partially self-contained due to the reactive current compensated by the arc-suppression coil when the neutral point is grounded through the arc-suppression coil. Off, but the arc suppression coil can only compensate for reactive current, and there is still the problem of grounding residual current after compensation
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[0036] The method of this application can be used for figure 1 In the circuit shown, the circuit includes A-phase power supply, B-phase power supply, and C-phase power supply; the three-phase phase power supplies are respectively connected to the grounding transformer 9 and the corresponding distributed capacitance 10 to the ground. The grounding transformer 9 is connected in series with the compensation inductance 5 and the damping resistor 6; the two ends of the damping resistor 6 are connected in parallel with the second switch 8; one end of the damping resistor 6 and a part of the damping resistor are connected in parallel with the first switch 7. The grounding transformer 9 is also connected in series with the controllable current source 1 , and a voltage sensor 3 and a current sensor 2 are connected in series between the grounding transformer 9 and the controllable current source 1 . The current sensor 2 and the voltage sensor 3 are respectively connected to the control ...
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The invention provides a method for controlling grounding full compensation of a controllable current source with inductance compensation. According to the method, the compensation current when a three-phase fault occurs in any phase of three phases can be accurately and quickly calculated so as to control the current source to accurately output compensation current when a phase has a single-phaseground fault, the ground residual current can be quickly compensated, the ground current can be fully compensated, the risk of personnel contact can be avoided, the method has the advantages of simple system structure, easy control and high stability, a principle calculation method and a control method are provided for the grounding fault current full compensation engineering application based onthe controllable current source, and a controllable current source full compensation device can be developed on the basis of the invention.
Description
technical field [0001] The present application relates to the field of electric power systems, and in particular to a control method for grounding full compensation of a controllable current source with inductance compensation. 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. When the system capacitive current exceeds a certain value, the grounding arc cannot be extinguished by itself when a single-phase grounding fault occurs, resulting in arc overvoltage and other secondary hazards. 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 pe...
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IPC IPC(8): H02H9/02H02J3/26
CPCY02E40/50
Inventor 刘红文王科张恭源赵现平
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST