Abstract
This study introduces a supercapacitor hybrid energy storage system in a wind-solar hybrid power generation system, which can remarkably increase the energy storage capacity and output power of the system. In the specific solution, this study combines the distributed power generation system and the hybrid energy storage system, while using the static reactive power compensation system and the conductance-fuzzy dual-mode control method to increase output power in stages. At the same time, the optimal configuration model of the wind-solar hybrid power generation system is established using MATLAB/Simulink software. The output power of the microgrid to the wind-photovoltaic hybrid power generation system is calculated by simulation, and the optimization process of each component of the system is simulated. This study mainly uses the static reactive power compensation system and the conductance-fuzzy dual-mode control method to optimize the wind-solar hybrid power generation system. Using MATLAB software simulation verifies the feasibility and rationality of the optimal configuration of the system.
Highlights
The development and utilization of wind energy and solar energy has become indispensable in the field of renewable energy
According to reactive power theory, Static Var Generator (SVG) unit and the grid are free of loss in power exchange; the total instantaneous power of the grid is fixed and does not produce energy loss in the compensator [18]
Simulation parameters: wind speed V 10 m/s and random wind ±2 m/s, as shown in Figures 6 and 7. e results show that, in wind farms, SVG devices can remarkably reduce the output power fluctuation caused by random wind
Summary
China’s 13th Five-Year Plan for Energy Development points out that “the developing speed of renewable energy such as hydropower, wind energy, and solar energy should be accelerated.” Among these energy sources, the development and utilization of wind energy and solar energy has become indispensable in the field of renewable energy. To increase the capacity of renewable energy, grid-connected wind-solar hybrid energy storage systems have become popular due to the technological maturity of both forms of power [1]. Considering that the power output of wind-solar hybrid energy storage system should achieve an ideally steady level, dispatchable energy storage is introduced. 2. Mathematical Model is section introduces system structure of the wind-solar hybrid energy storage system. Mathematical models are given with respect to photovoltaic cell, wind turbines, supercapacitors, output power of inverters, and converters. In the course of this work, capacitive values and voltages correspond to both sides of the capacitor, and ΔW represents the supercapacitor energy change in the equivalent circuit (ΔW is the integration of Pc (t) with t) within the interval [t (n − 1), t (n + 1)]. Uc (t) is capacitor voltage. e series resistance of the capacitor is Rs. e measured value for the capacitor is
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