Friendly Load Control Scheme with Importance Degree and Intention

With intermittent renewable power generator increasing, it is difficult for microgrid to maintain power generation and demand balance only rely on micro generators control due to power generation randomness. As an important controllable resource, friendly power electronics loads (FPELs), e.g. air conditioners, water heater, can be introduced to improve reliability and stability of microgrid. A friendly load control scheme considering importance degree and intention of loads was proposed to introduce FPELs into power generation and demand balance of microgrid. In microgrid, frequency can indicate power generation and demand balance. When the frequency below and near its minimum value, it means that the power generation is near to rated capacity. Friendly load control scheme can trigger the FPELs to reduce their power consumption according trigger signal preset for every FPEL. The load power was controlled along with frequency deviation, importance degree and intention of loads. This control scheme can automatically introduce the loads in power generation and demand balance control of microgrid. It can save reserve capacity of energy storage and reduce investment of microgrid. Simulation results show the effectiveness of the proposed control scheme.