CN109921403B - Controllable current source earth fault full compensation method without inductance compensation - Google Patents
Controllable current source earth fault full compensation method without inductance compensation Download PDFInfo
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- CN109921403B CN109921403B CN201910259671.2A CN201910259671A CN109921403B CN 109921403 B CN109921403 B CN 109921403B CN 201910259671 A CN201910259671 A CN 201910259671A CN 109921403 B CN109921403 B CN 109921403B
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Abstract
The application provides a controllable current source earth fault full compensation method without inductance compensation, which comprises the steps of obtaining three-phase voltage and corresponding single-phase earth distribution impedance under the normal operation of a power distribution network system; judging whether the power distribution network system has single-phase earth faults or not, and if the power distribution network system has single-phase earth faults, determining the earth phase with the single-phase earth faults; calculating to obtain compensation current according to a preset formula according to single-phase corresponding distributed impedance corresponding to grounding and phase voltage of a grounding phase under normal operation of a power distribution network system; and controlling the controllable current source to output according to the compensation current until the single-phase grounding process is finished. The system has the advantages of simple system structure, easy control and strong stability, provides a principle calculation method and a control method for realizing the ground fault current full compensation engineering application based on the controllable current source, and can develop a controllable current source full compensation system or device on the basis of the invention.
Description
Technical Field
The application relates to the field of power systems, in particular to a controllable current source ground fault full compensation method without inductance compensation.
Background
Low-voltage power distribution networks in China generally adopt a low-current grounding mode, including a neutral point ungrounded mode or a neutral point arc suppression coil grounding mode. When the neutral point is not grounded, the grounding electric arc cannot be extinguished by self, and the personnel safety and the operation safety cannot be guaranteed. Under the mode that the neutral point is grounded through the arc suppression coil, part of the grounding arc can be automatically extinguished under the reactive current effect compensated by the arc suppression coil, but the arc suppression coil can only compensate the reactive current, and the grounding residual current still exists after compensation. Residual current contains certain overcompensation inductive current and active current, and the risk of electric shock of people still exists. The purpose of completely extinguishing the electric arc can be achieved by fully compensating the grounding current, so that the zero current compensation method is a reliable and safe single-phase grounding fault treatment means. At present, the research of grounding current full compensation is mostly realized on the basis of accessing a current source at a neutral point, and the loop structure and the method are complex and difficult to be practically applied.
Disclosure of Invention
The application provides a controllable current source ground fault full compensation method without inductance compensation, and aims to solve the problems that the research of ground current full compensation is mostly realized based on the fact that a current source is connected to a neutral point, the loop structure and the method are complex, and practical application is difficult.
The application provides a controllable current source earth fault full compensation method without inductance compensation, which comprises the following steps:
acquiring three-phase voltage and corresponding single-phase ground distribution impedance under normal operation of a power distribution network system;
judging whether the power distribution network system has single-phase earth fault, and if the power distribution network system has single-phase earth fault, determining the earth phase with the single-phase earth fault;
calculating to obtain compensation current according to a preset formula according to the single-phase corresponding distributed impedance corresponding to the grounding and the phase voltage of the grounding phase under the normal operation of the power distribution network system;
and controlling the controllable current source to output according to the compensation current until the single-phase grounding process is finished.
According to the technical scheme, the ground current full compensation method of the controllable current source without inductance compensation is realized based on the controllable current source, the system is simple in structure, easy to control and high in stability, a principle calculation method and a control method are provided for realizing the ground fault current full compensation engineering application based on the controllable current source, and a controllable current source full compensation system or device can be developed on the basis of the method.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a circuit diagram of a controllable current source ground fault full compensation circuit without inductive compensation applied in the present invention;
fig. 2 is a flowchart of a method for fully compensating for a ground fault of a controllable current source without inductive compensation according to the present application.
Detailed Description
The method of the present application can be used in the circuit shown in fig. 1, where the circuit includes an a-phase power supply Ua, a B-phase power supply Ub, a C-phase power supply Uc, a switch K, and a controllable voltage source U0, and the a-phase power supply Ua, the B-phase power supply Ub, and the C-phase power supply Uc are distributed in a positive sequence.
A-phase power supply Ua and corresponding single-phase ground distributed impedance ZCConnecting to form an A-phase power supply branch; b-phase power source Ub and corresponding single-phase ground distributed impedance ZCConnecting to form a B-phase power supply branch circuit; c-phase power source Uc and corresponding single-phase ground distributed impedance ZCConnecting to form a C-phase power supply branch; corresponding single-phase to ground distributed impedance Z in a phase power supply branch with a single-phase ground faultCAnd the upper part is connected with a grounding transition resistor Zd in parallel.
The phase A power supply branch, the phase B power supply branch and the phase C power supply branch are connected in parallel, a neutral point N is formed at the connection position of the phase A power supply Ua, the phase B power supply Ub and the phase C power supply Uc, and corresponding single-phase earth distributed impedance ZCThe connection part is grounded; the neutral point N is connected with the controllable current source Ik in series and then is grounded.
Referring to fig. 2, the present application provides a method for fully compensating a ground fault of a controllable current source without inductance compensation, the method comprising:
step 21: acquiring three-phase voltage and corresponding single-phase ground distribution impedance under normal operation of a power distribution network system;
step 22: and (4) judging whether the power distribution network system has single-phase earth fault, and if the power distribution network system has single-phase earth fault, executing the step (23).
Step 23: the earth phase in which the single-phase earth fault occurs is determined.
Specifically, a zero sequence voltage value and a bus voltage value corresponding to a three-phase power supply are obtained; and if the zero sequence voltage value corresponding to the three-phase power supply is in the range of the preset voltage value, determining the lagging phase of the phase where the highest phase voltage value is located in the three-phase power transmission line as the grounding phase.
Step 24: and calculating to obtain the compensation current according to a preset formula according to the single-phase corresponding distributed impedance corresponding to the grounding and the phase voltage of the grounding phase under the normal operation of the power distribution network system. The reference direction of the compensation current is the direction from the ground to the neutral point of the power distribution system.
The preset formula is
Wherein, IkTo compensate for the current, ZCIn order to ground the corresponding single-phase distributed impedance,
the phase voltage of the grounding phase under the normal operation of the power distribution network system.
Step 25: and controlling the controllable current source to output according to the compensation current until the single-phase grounding process is finished.
According to the technical scheme, the ground current full compensation method of the controllable current source without inductance compensation is realized based on the controllable current source, the system is simple in structure, easy to control and high in stability, a principle calculation method and a control method are provided for realizing the ground fault current full compensation engineering application based on the controllable current source, and a controllable current source full compensation system or device can be developed on the basis of the method.
Claims (3)
1. A method for fully compensating a ground fault of a controllable current source without inductance compensation, the method comprising:
acquiring three-phase voltage and corresponding single-phase ground distribution impedance under normal operation of a power distribution network system;
judging whether the power distribution network system has single-phase earth fault, and if the power distribution network system has single-phase earth fault, determining the earth phase with the single-phase earth fault;
calculating to obtain compensation current according to a preset formula according to the single-phase corresponding distributed impedance corresponding to the grounding and the phase voltage of the grounding phase under the normal operation of the power distribution network system; the preset formula is
Wherein, IkTo compensate for the current, ZCIn order to ground the corresponding single-phase distributed impedance,
the phase voltage is the phase voltage of the grounding phase under the normal operation of the power distribution network system;
and controlling the controllable current source to output according to the compensation current until the single-phase grounding process is finished.
2. The method of claim 1, wherein the reference direction of the compensation current is a direction pointing from ground to a neutral point of the power distribution system.
3. The method of claim 1, wherein the determining a ground phase in which a single-phase ground fault occurs comprises,
acquiring a zero sequence voltage value and a bus voltage value corresponding to a three-phase power supply;
and if the zero sequence voltage value corresponding to the three-phase power supply is in the range of the preset voltage value, determining the lagging phase of the phase where the highest phase voltage value is located in the three-phase power transmission line as the grounding phase.
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| CN110261720B (en) * | 2019-08-06 | 2021-01-29 | 云南电网有限责任公司电力科学研究院 | Single-phase grounding judgment method and device for power distribution network grounding fault |
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