RESEARCH ON PRIMARY FREQUENCY REGULATION SCHEME OF WATER-WIND-SOLAR COMPLEMENTARY SYSTEM
New energy increases in proportion year after year in Yunan Power Grid.In order to solve the frequency problem caused by the integration of new energy into the grid,this paper proposed a frequency regulation strategy in consideration of complementary water,wind and light.First,a simple system mathematical model with wind,water,light and charge was established.Secondly,by combining the algebraic differential equations corresponding to water turbine,wind turbine,photovoltaic,and their frequency regulation strategy with the system network equations on the basis of DC power flow,the frequency domain analytical expressions for the frequency response of water turbines,wind turbines,and photovoltaic grid connected nodes under load disturbances were derived.According to the analytical formula of the impact of frequency regulation dead zone and frequency regulation control parameter on the system frequency,a joint frequency modulation scheme for water solar complementary systems was proposed.A simulation model of the four machine system and the actual power grid was built in the simulation software PSD-BPA to verify the effectiveness and feasibility of the frequency regulation scheme.The simulation results in multiple scenarios indicate that this method can improve the system's primary frequency regulation ability.
renewable energyfrequency responsedroop controlwater-wind-solar complementary system dead zoneswater hammer effect
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