On-line modeling and simulation method for grid-connected inverter loss
A simulation method and inverter technology, applied in the direction of AC network circuit, single-network parallel feeding arrangement, circuit device, etc., can solve the problems of inaccurate and unfavorable inverter system-level efficiency research, online analysis, etc., and achieve the model Simple and accurate effects
Active Publication Date: 2018-12-21
HEFEI UNIV OF TECH
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[0007] The purpose of the present invention is to solve the cumbersome and inaccurate calculation process of the inverter loss, it is difficult to analyze the loss online, it is not conducive to the research on the efficiency of the inverter system level, and it is impossible to analyze the power loss caused by the control algorithm.
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[0027] In this embodiment, a 500KW grid-connected inverter system in the simulation software Matlab / Simulink is taken as an example to illustrate an online modeling and simulation method of grid-connected inverter losses. The steps of this embodiment are as follows.
[0028] First follow in the simulation software Matlab / Simulink figure 1 Build the loss modeling topology of the grid-connected inverter proposed by the present invention. Use Universal bridge / ideal switch (universal bridge arm / ideal switch module) and capacitance and inductance module to form an inverter simulation model. In the inverter simulation model, the grid-connected inverter switching frequency ω sw =6000π(rad / s), fundamental frequency ω 0 =100π(rad / s), using LCL filtering, L1 is 0.1mH; L2 is 0.05mH; C is 200μF. The DC side of the inverter simulation model is connected with a DC power source, such as photovoltaic modules, wind turbines, etc., and the DC side voltage U dc =650(V). Three AC voltage source...
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The invention provides a loss on-line modeling and simulation method of a grid-connected inverter. The method comprises the following steps of connecting an ideal controlled current source simulation model in parallel between an inverter simulation model and a power grid simulation model to simulate power loss of the grid-connected inverter, wherein a current phase of an ideal controlled current source is the same as the current of an inverter grid side, a step of calculating an effective value I' of the current of the ideal controlled current source comprises the following steps of measuring an efficiency curve of the grid-connected inverter simulation model; detecting a power grid voltage in real time, acquiring an effectively value Up, detecting a power grid current in real time, acquiring an effective value Ig and phase difference Theta between the effective value Up and the effective value Ig, and calculating a power point x of the grid-connected inverter working at present; and calculating the effective valve I' of an output current of the ideal controlled current source. By the method, the loss of the inverter in a current working condition can be simulated on line, on-line analysis of the loss is achieved, the mutual influence of the loss and control of the inverter can be achieved, thus, the influence of a control algorithm on the loss can be analyzed, and the method is simple and accurate.
Description
Technical field [0001] The invention relates to a grid-connected inverter loss simulation method, in particular to a grid-connected inverter loss online modeling simulation method that can analyze the inverter loss online. Background technique [0002] Inverter loss research is directly related to the efficiency and reliability of the inverter. Accurate calculation of inverter loss is very important for heat dissipation design, device parameters and system optimization. Therefore, inverter loss modeling has always been an important research direction in the field of power electronics. In the study of inverter loss modeling, there has been a document "Li Xiang, Ma Chaoqun, Liang Qi. Loss modeling and analysis of high-power photovoltaic inverters[J].Power Electronics,2014,01:12 -14.", "Hong Feng, Shan Renzhong, Wang Huizhen, Yan Yangguang. A new method for inverter loss analysis and calculation[J]. Proceedings of the Chinese Society of Electrical Engineering, 2008,15:72-78." etc. ...
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IPC IPC(8): H02J3/38
CPCH02J3/38H02J2203/20
Inventor 李飞奚霁仲张兴吴凡刘朋
Owner HEFEI UNIV OF TECH