Reactive power compensation device
The general power factor for the electrical industry is 0.85 or higher for low voltage and 0.9 or higher for high voltage. To overcome reactive power losses, reactive power compensation devices must be used to solve the problem. The existing reactive power compensation equipment in the power system includes two types: static reactive power compensation devices and dynamic reactive power compensation devices. The former includes parallel capacitors and parallel reactors, while the latter includes synchronous compensators (phase-shifters) and static reactive power dynamic compensation devices (SVS).
The function of a shunt reactor is:
Absorb capacitive current, compensate for capacitive reactive power, and achieve reactive power balance in the system; 2) It can weaken the capacitance effect, limit the increase in power frequency voltage and operating overvoltage of the system. Its disadvantage is the fixed capacity parallel reactor. When the transmission power of the line approaches the natural power, it will cause an excessive decrease in the line voltage and additional active power loss. However, if it is cut off, the line may also experience unacceptable overvoltage due to loss of compensation in some cases.
The improvement method is to use a controllable reactor, which changes the saturation of the iron core (i.e. working point) through the excitation of the control circuit DC, thereby achieving the goal of smooth regulation of reactive power output.
Used in industry
1. Synchronous motor and synchronous phase-shifting camera;
2. Use phase-shifting capacitors;
3.Currently, most of them mainly use phase-shifting capacitors.