FEATURES OF DESIGN THE PART OF POWER ELECTRONICS IN SOLAR GRID ON INVERTERS
In the study of inverters have been identified parameters that affect its performance. One of the parameters is the internal components of the inverter on which the efficiency of its operation depends. The main power component is the Power Stack. The main component of the power module is the IGBT (bipolar insulated gate transistor).
This type of transistor combines the characteristics of two semiconductor devices:
- Bipolar transistor (forms a power channel).
- FET (forms a control channel).
When calculating the efficiency of the inverter, it is necessary to understand how its power part works and how the power time turns the direct current into an alternating current. The operation of the power transistors is controlled by the driver. This unit controls the frequency of opening and closing of the transistors and the output voltage characteristics of the inverter.
To control the inverters the driver receives a signal and sends a command to the power module itself. In this way the output parameters of the inverter are adjusted. To control the output power the inverter used an algorithm to reduce the input power. This is achieved by switching the FEM field operating point from the MPPT point to the operating point closest to the idle mode of the solar panel. Adjustment of the reactive power level is also due to the operation of the power module.
For the inverter to operate its power module must have good cooling. Cooling should ensure that the heat module is removed from the power module, which in turn will prevent the transistor from breaking down. Modern inverters use an active and passive cooling system. Usually passive cooling inverters have a capacity of up to 100 kW. Some manufacturers also have thematic models of water cooled inverters. The power of these inverters is expected to be greater than 2500 kW. Ref. 10, fig. 5.
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