The three-phase load unbalance automatic adjustment device (SPC) is mainly used for the low-voltage power distribution user side to control the three-phase current imbalance, the phase voltage is low and the compensation is reactive, and the power quality is optimized.
Three Phase Load Unbalance Automatic Regulating System
The three-phase load unbalance automatic adjustment device (SPC) is mainly used for the low-voltage power distribution user side to control the three-phase current imbalance, the phase voltage is low and the compensation is reactive, and the power quality is optimized. SPC product specifications cover 50A/35kvar, 75A/50kvar, 150A/100kvar, which can compensate three-phase unbalanced current and reactive power at the same time, achieving continuous and dynamic compensation.
SPC can comprehensively improve the power quality of the station area, as follows:
◎ Solve the three-phase imbalance problem of the distribution network and reduce the line loss;
◎ Stabilize three-phase voltage, improve power supply quality and improve power consumption environment;
◎ Solve the single-phase overload problem of the transformer and improve the operating life of the transformer;
◎ Reactive power balance to improve the effective output capacity of the distribution network;
Three-phase unbalance compensation principle
After the SPC is turned on, the system current is detected in real time by an external current transformer (CT), and the system current information is sent to the internal controller for processing and analysis to determine whether the system is in an unbalanced state, and at the same time, the phases are calculated when the equilibrium state is reached. The current value to be converted is then sent to the internal IGBT and its action is driven to shift the unbalanced current from a phase with a large current to a phase with a small current, and finally to a three-phase equilibrium state.
Principle of reactive power compensation
After the three-phase load unbalance automatic adjusting device is turned on, the external current transformer (CT) is used to detect the load current in real time, and the reactive power content of the load current is analyzed by internal DSP calculation, and then the PWM signal generator is controlled according to the set value. The signal is given to the internal IGBT to enable the inverter to generate the reactive power compensation current that meets the requirements, and finally achieve the purpose of dynamic reactive power compensation.
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