The topology of the photovoltaic inverter system is introduced, and the mathematical model based on the filter inverter is established. For the convenience of analysis, the equations in the abc three-phase stationary coordinate system are reduced to the mathematical equations in the dq two-phase rotating coordinate system. The control structure and control parameter design of the inverter are briefly introduced.
Starting from the principle of the filter, the principle of single L-type and LCL filter is compared and analyzed. In the design method, compared with the traditional step-by-step design method, the parameter design of the new LCL filter based on particle swarm optimization is selected. Finally, the correctness of the parameter design of the LCL filter and the inverter voltage control strategy of the photovoltaic integrated into the distribution network are verified by simulation analysis.
In the grid-connected photovoltaic power generation system, the photovoltaic array is removed as the power generation device, and the grid-connected inverter is an important device for realizing the operation of the entire photovoltaic power generation system. It is the core link of the high-quality power supply to the power grid, and its control strategy is optimized. It is of great significance to improve the power generation efficiency of the entire photovoltaic system.
At present, inverter classification mainly includes DC voltage power supply type and DC current power supply type, isolated type and non-isolated type, etc. [1]. At present, voltage-type grid-connected inverters are widely used in the application field. When the inverter is working, harmonics will be generated due to the action at the switch, and the output current of the grid will be injected with additional harmonics [2-3].
In order to ensure the power quality of the grid connection, the harmonics must be processed. The existing solution is to install a filter between the grid side and the inverter [4], and the common filters are L-type and LCL type. How to select and determine the specific design method of the filter has become the focus of current research on photovoltaic system control.
In this paper, the mathematical topology and inverter control strategy of photovoltaic power generation system and the design method of photovoltaic inverter LCL filter parameters are studied. The voltage and current double closed loop inverter control strategy is optimized, and the filter principle of the filter is applied. And performance analysis.
According to the specified filter parameter design requirements, the filter parameter design is optimized. Finally, the simulation platform of the photovoltaic power generation system is established, which provides the simulation implementation for the theoretical verification of this paper.
Figure 2 S-domain model of the filter
in conclusion
In this paper, the mathematical topology and inverter control strategy of photovoltaic power generation system and the design method of photovoltaic inverter LCL filter parameters are studied. The voltage and current double closed loop inverter control strategy is optimized, and the filter principle of the filter is applied. And performance analysis.
According to the specified filter parameter design requirements, the filter parameter design is optimized. Finally, the parameter design of the LCL filter and the correct voltage control strategy of the inverter incorporated into the distribution network are verified by simulation analysis. Sex.
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