Simulation of Direct Power Control of Photovoltaic Inverter under Unbalanced Voltage
In order to effectively avoid the fluctuation of photovoltaic inverter under unbalanced voltage,this arti-cle presented a method of controlling the direct power of photovoltaic inverter under unbalanced voltage.Firstly,we analyzed the characteristics of the photovoltaic inverter,and then designed the filter parameters of the DC side and AC side through three-phase inverter topology.Under the unbalanced voltage,we built a mathematical model under grid connected mode of the inverter,thus obtaining the influence of unbalanced voltage on the photovoltaic inverter.Fur-thermore,we used regulating parameters to adjust the natural oscillation frequency in real time,and thus to accurately extract the positive and negative sequence components and phase information.Meanwhile,we used the multi-objective coordinated control method to construct a multi-objective function.After that,the particle swarm algorithm was also used to optimize the function and output the optimal coordination coefficient,thus making the photovoltaic inverter work in the optimal state.Finally,we realized the direct power control of photovoltaic inverter.Simulation results show that the proposed method can accurately extract harmonic components and maintain certain stability in power control.
Under unbalanced voltagePhotovoltaic inverterDirect power controlRegulating parameterParti-cle Swarm Optimization
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