Autonomous frequency response of different types of inverter-interfaced loads

In this paper, fast frequency response ofdifferent types of inverter-interfaced loads is discussed.Two inverter-interfaced loads are considered, and theirshort time-scale response in active power contribution isevaluated. First, a power system including conventionalgenerating units with primary frequency controllers ismodelled with conventional passive loads. Then, thecontrol technique of different active load types, when theyare equipped with droop controllers is discussed. It isshown that when a contingency event occurs, thebehaviour of each load type in controlling frequency andthus their response in active power contribution aredifferent. For the power system with a high demand sidecontribution in the primary frequency control, a suitabledesign consideration is provided in order to keep systemfrequency within threshold operating bound.Furthermore, to analyse the effectiveness of inverterinterfaced loads, their frequency response is compared tothat of conventional generating units, revealing thepotential of inverter-interfaced loads to provideconsiderably faster settling time and smaller overshoot.MATLAB/SIMULINK is utilised to simulate the powersystem