FIELD: electrical engineering.
SUBSTANCE: invention relates to the field of electrical engineering, in particular to power electronics and can be used to compensate the reactive power at the output and at the input of the power transformer of the substations. Reactive power compensator contains a booster transformer, a voltage inverter with a control system configured with a pulse-width modulation channel of the inverter output voltage and a phase control channel for the output voltage of the inverter, an LC-filter, active rectifier, network reactive power sensor and load voltage deviation sensor, choke, battery of cosine capacitors, comparator, a synchronization block and four-quadrant voltage vector formation, a synchronization unit, and a reactive load current calculation. Elements of the expansion joint are connected as follows. Primary windings of the booster and power transformers of the substation are connected in series and connected to the network. Secondary winding of the power transformer is directly connected to the load, and the secondary winding of the booster transformer through the voltage inverter with an input LC-filter, the active rectifier with an input choke is connected to the secondary winding of the power transformer. Output of the reactive power sensor of the network through the synchronization unit and four-quadrant generation of the boost voltage vector is connected to the phase control channel of the voltage inverter control system. Output of the synchronization unit and calculation of the reactive load current is connected to the control input of a control system configured to pulse-width modulation of the active rectifier. Output of the load voltage deflection sensor is connected to the control input of the pulse-width modulation channel with regulation of the output voltage of the voltage inverter control system, and also through the comparator to the control input of the synchronization unit and the four-quadrant generation of the voltage vector. Battery of cosine capacitors is connected to the network after the current input of the reactive power sensor of the network.
EFFECT: increase the energy efficiency of the power supply system and improve the weight and overall dimensions parameters.
1 cl, 2 dwg
