PCS active/reactive control system

The utility model discloses a PCS (Power Conversion System) active/reactive control system, comprising a current generator, a phase-locked loop, a grid side voltage converter, a three-phase current converter, a voltage transformer, a current transformer, two PI (Proportional-Integral) controllers, a coordinate converter, and an SVPWM (Space Vector Pulse Width Modulation) generator; wherein, through the above assemblies, a PWM (Pulse Width Modulation) control signal for controlling a power switch tube of a power grid is generated, so as to realize active/reactive decoupling control of the PCS; a control method comprises the steps of model reduction, coordinate transformation, current outer loop control, SVPWM modulation, etc. The PCS active/reactive control system of the utility model has the advantages of enabling the PCS to stably output or absorb designated active power and reactive power, realizing bidirectional flow of energy, etc.