Method for adjusting reactive power of capacitor and apparatus therefor

Abstract

The invention is a method for adjusting reactive power of capacitance. It connects the reactive compensating capacitance group C and assistant transformer TB secondary windings in series or in equivalent series, they and the primary windings of TB are connected to the same bus; makes the electric network voltage added on the capacitance group C, the other hand the TB secondary windings generates additional electric potential to add on the capacitance group C reversely; the two ends voltage of capacitance group C is the mould of electric potential difference of electric network voltage and additional electric potential; it uses thyristor switch device VT2 to change the tapping turn number of TB secondary windings, in order to change the turn number rate of the TB first and secondary windings and the electric potential, further changes the voltage of two ends of capacitance group C and the reactive power. The price is low, the control is simple, and it is easy to be realized, the permissible voltage is high, the control grades can reach 80.

Description

technical field [0001] The invention relates to an adjustment method and a used device for capacitor reactive power compensation. Background technique [0002] Capacitive reactive power compensation is the most common compensation device used by various electrical loads in the power network to adjust voltage and improve power factor, and it is also a reactive power supply commonly used in power systems. But at present, mechanical circuit breaker switching capacitor banks (MSC) are almost all used in China, which has the following problems. When the circuit breaker is switched on, the inrush current is large, which not only affects the power grid, but also increases the electrical wear of the circuit breaker contacts. Frequent operation is not allowed, and it can only adapt to slowly changing loads. If the grid voltage fluctuates greatly and the fluctuation frequency is high, especially for railway electric traction, electric arc furnace, rolling mill, oil field pumping unit...

AI Technical Summary

Problems solved by technology

This device requires two transformers, although the total capacity is only 60% of the rated capacity of the compensation device, which still increases the cost of the device

In addition, the thyristor switching device of the Russian CKY has different junctions during the level change process, resulting in the flow of the thyristor switch current at different levels, and its direction is changed, resulting in the complexity of the level change control, thus hindering the development of the Russian CKY. Promote application

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