Thyristor Controlled Capacitors with Continuous Adjustment of Single-phase Reactive Power

Abstract

The invention discloses a single-phase reactive continuously adjustable thyristor control capacitor. The thyristor control capacitor comprises a hardware circuit module, a measuring and filtering module and a control system module; wherein the hardware circuit module comprises a set of thyristors which are connected reversely in parallel, and a set of a reactor, a capacitor and a resistor; the thyristors, the reactor, the capacitor and the resistor are mutually connected in series; and a continuously adjustable reactive power can be imported in a power grid system, thus improving the operation voltage level of the system and the improving the systems stability. The measuring and filtering module is used for sampling and filtering the voltage and current of the system; results are output to the control system module for adjustment; the control system module can control the hardware circuit module according to the feedback values obtained by the measuring and filtering module; and therefore, a hardware circuit can output an expected reactive power. According to the thyristor control capacitor provided by the invention, the capacitive reactive power can be adjusted continuously; reactive cancellation is unnecessary; the reactive waste is reduced; the used inductance is relatively low; the capacitance is relatively high; the size can be reduced effectively; and the investment cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of reactive power compensation for low-voltage power grids, in particular to a thyristor-controlled capacitor with continuously adjustable single-phase reactive power. Background technique [0002] Reactive power is very important to the operation of the power supply system and the load. The impedance of the power system network components is mainly inductive, that is, in order to transmit active power, it is necessary to require a phase difference between the voltage of the power transmitting end and the power receiving end. In order to transmit Reactive power requires a difference in amplitude between the two ends of the voltage. Most network components consume reactive power, and most loads consume reactive power. The main function of reactive power compensation is to improve the power factor to reduce equipment capacity and power loss. , Stabilize the voltage and improve the quality of power supply. [...

AI Technical Summary

Problems solved by technology

Therefore, whether it is TCR+FC or TCR+TSC, it will cause huge waste and greatly increase the investment cost.

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