Abstract
With the rapid increase of photovoltaic (PV) penetration and distributed grid access, photovoltaic generation (PVG)-integrated multi-area power systems may be disturbed by more uncertain factors, such as PVG, grid-tie inverter parameters, and resonance. These uncertain factors will exacerbate the frequency fluctuations of PVG integrated multi-area interconnected power systems. For such system, this paper proposes a load frequency control (LFC) strategy based on double equivalent-input-disturbance (EID) controllers. The PVG linear model and the multi-area interconnected power system linear model were established, respectively, and the disturbances were caused by grid voltage fluctuations in PVG subsystem and PV output power fluctuation and load change in multi-area interconnected power system. In PVG subsystems and multi-area interconnected power systems, two EID controllers add differently estimated equivalent system disturbances, which has the same effect as the actual disturbance, to the input channel to compensate for the impact of actual disturbances. The simulation results in MATLAB/Simulink show that the frequency deviation range of the proposed double EID method is 6% of FA-PI method and 7% of conventional PI method, respectively, when the grid voltage fluctuation and load disturbance exist. The double EID method can better compensate for the effects of external disturbances, suppress frequency fluctuations, and make the system more stable.
Highlights
With the rapid development of economy and society, people’s demand for electricity is increasing day by day
One of the EID controllers was used in photovoltaic generation (PVG) subsystems to maintain stable output power by load fluctuations, this paper proposes a double EID strategy to control the frequency stability of the suppressing grid voltage fluctuations and controlling the output current of the inverter
This paper proposed a load frequency control (LFC) strategy for a photovoltaic generation (PVG)-integrated multi-area interconnected power system based on double-equivalent-input disturbance (EID) controllers
Summary
With the rapid development of economy and society, people’s demand for electricity is increasing day by day. In order to meet the needs of production and life, regional grids have become increasingly interdependent and interactive and the power quality of power supply and distribution systems has become increasingly important. A large-scale interconnected power system consists of many interconnected subsystems (so called control areas), which are connected to each other by tie lines. Each area has its own generator or generator sets to meet its own load demand and power interchange needs with neighbours [1]. If the power of an area fluctuates due to load fluctuations, communication link delays and failures, the frequency stability of the entire system will be destroyed. In order to Energies 2020, 13, 6103; doi:10.3390/en13226103 www.mdpi.com/journal/energies
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