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In recent years, photovoltaic has generation become the most popular renewable energy basedgenerations. However, this power generation cannot supply constant electric power output andsometimes cause the imbalance between supply and demand. To alleviate the mentioned problem, anumber of Heat Pump Water Heaters (HPWH) and Electric Vehicles (EV) are used as new controlequipment for Load Frequency Control (LFC) in order to suppress the frequency fluctuation caused bysuch a large amount of renewable energy sources. However, Due to the system uncertainties such assystem parameters variation, the conventional controllers which are designed without taking systemuncertainties into account in the controller design may lose the control effect and fail to damp thefrequency deviation. This will affect the quality of supply and may deteriorate the system stability.This paper proposes, A New load frequency control (LFC) using the coefficient diagram method(CDM) technique in the presence of variable solar power & thermal power have been presented. TheCDM technique has been designed such that the effect of the uncertainty due to governor and turbineparameters variation and variable solar power & load disturbance is reduced. Digital simulations for apower system are provided to validate the effectiveness of the proposed scheme. A performancecomparison between the proposed and a conventional integral control scheme is carried out confirmingthe superiority of the proposed CDM technique in smart power system

ROBUST LOAD FREQUENCY CONTROL APPROACH FOR SMART POWER SYSTEMS CONCERNING ELECTRIC VEHICLES AND HEAT PUMP WATER HEATERS