A Compensation Voltage Determination Method for Full Compensation of Ground Current of Controllable Voltage Source
A technology for compensating voltage and grounding current, applied in the direction of measuring electricity, measuring electrical variables, short-circuit testing, etc., it can solve the problems of difficulty in applying the distribution network system, and the method of determining the compensation voltage is complicated, and achieves the effect of fast calculation method.
Active Publication Date: 2020-05-29
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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[0003] This application provides a compensation voltage determination method for full compensation of the ground current of a controllable voltage source to solve the problem that the existing compensation voltage determination method for full current compensation is complicated and difficult to apply to the actual distribution network system
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[0022] See figure 1 This application provides a method for determining the compensation voltage for the full compensation of the ground current of the controllable voltage source, which is applied to the ground fault current compensation of the distribution network using the controllable voltage source. The specific circuit includes a controllable voltage source, a transformer, and The three-phase power source is connected to the three-phase power source through a transformer. Preferably, the controllable voltage source is connected in parallel with an arc suppression coil, the specific circuit can be found in figure 2 , Where U A , U B And U C It is the A, B and C phases of the three-phase voltage.
[0023] See image 3 In another embodiment of the present application, based on the above circuit, a method for determining a compensation voltage for full compensation of a controllable voltage source ground current is provided, which includes the following steps:
[0024] Step 31:...
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The invention provides a method for determining a compensation voltage for full compensation of the grounding current of a controllable voltage source. The method comprises steps that a voltage amplitude and a phase angle of an initial voltage of a target phase are acquired; the controllable voltage source is controlled for outputting an initial detection voltage, and a voltage amplitude and a phase angle of the initial detection voltage are acquired; the phase of the initial detection voltage is adjusted, and a corresponding phase angle of the target phase is measured; an absolute value of difference between the phase angle of the initial phase voltage of the target phase and the measured phase angle of the target phase is calculated; whether the absolute value is less than a preset threshold is determined, if yes, a voltage amplitude and a phase angle of a compensation voltage of the controllable voltage source are calculated and obtained, if not, the progress jumps to the step of adjusting the phase of the initial detection voltage. The method is advantaged in that under various topologies for full compensation of the grounding current of the controllable voltage source, a compensation output value of the controllable voltage source in single-phase grounding connection can be calculated quickly and accurately, the calculation method is fast, effective and simple, and the method can be well applied to a practical distribution network system.
Description
Technical field [0001] This application relates to the technical field of single-phase grounding full compensation of power grids, and in particular to a method for determining compensation voltage for full compensation of ground current of a controllable voltage source. Background technique [0002] In power grid systems, especially in low- and medium-voltage distribution grid systems, single-phase ground faults account 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 ungrounded method, the neutral point grounding method through the arc suppression coil, or the neutral point grounding method through a low-value resistance. When the neutral point is not grounded, the grounding current is not compensated and it runs with a fault, and there is a risk of personal electric shock. When the neutral point is grounded by the arc suppression coil, the arc suppre...
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IPC IPC(8): G01R31/52G01R31/08
CPCG01R31/086G01R31/088G01R31/50
Inventor 刘红文王科
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST