Load Simulator with Power Recovery Capability Based on Voltage Source Converter-Inverter Set

This paper proposes a load simulator with power-recovery capability. The load simulator consists of a converter-inverter set with a DSP controller for system control and PWM pulse generation. The converter operates as a universal load to model the linear load and the non-linear load, while the inverter feeds the energy back to the power source with harmonic compensation. The operation of proposed system was analyzed through simulations with PSCAD/EMTDC, and the feasibility of hardware implementation was confirmed through experimental works with a 20 kVA prototype. The load simulator can save the electric energy that should be consumed to test performance of the power quality compensator and power equipment.