Power substation inverter: structure, principle and application.
I. Introduction. With the continuous development of the modern power system, power substations have become an important component. As one of the key equipment in the power substation, the inverter has the important function of converting direct current energy into alternating current energy. This article will introduce in detail the structure, principle and application of power substation inverter in power system.
Second, the structure of the inverter of the power substation.
The inverter of the power substation is mainly composed of semiconductor switching devices, filter circuits, transformers, etc. Among them, semiconductor switching devices are the core part of the inverter, including transistors, field effect transistors, etc. The filter circuit is used to suppress the harmonic component of the output current and ensure the quality of the output AC. The transformer is used to convert the voltage level, so that the inverter can adapt to the different levels of power demand.
3. The working principle of the inverter of the power substation.
The working principle of an electric substation inverter is to convert direct current energy into alternating current energy. In the inverter, the semiconductor switching device switches with a certain control law, so that the output of the inverter obtains an alternating current of a different frequency and voltage level than the input. Normally, the control law of the inverter adopts waveforms such as sine wave or square wave to ensure the quality of the output AC.
Fourth, the application of power substation inverter.
Power substation inverters are widely used in the power system, mainly including the following aspects:
1.New energy grid-connected: With the continuous development of new energy power generation, power substation inverters have been widely used in new energy grid-connected systems. The inverter can convert the direct current generated by the new energy into alternating current and connect it to the grid, increasing the proportion of renewable energy in the power system.
2.Power quality improvement: Power substation inverters can be used to improve power quality, such as voltage fluctuations, harmonic interference, and other issues. The inverter can suppress the harmonic components and improve the power quality by controlling the output current.
3.Energy storage system: Power substation inverters are also widely used in energy storage systems. Devices such as batteries in energy storage systems typically output direct current, and inverters can convert direct current into alternating current for applications such as load regulation and energy in the power system.
4.Industrial power supply: power substation inverters can also be used in the field of industrial power supply. In industrial production, various equipment needs to use different levels of voltage and frequency, and the inverter can convert direct current into corresponding alternating current according to the demand to meet the power demand of different equipment.
5.EV charging piles: With the popularity of electric vehicles, power substation inverters have also been applied in EV charging piles. The inverter can convert direct current into alternating current to provide power for electric vehicle charging piles and realize fast charging of electric vehicles.
V. Conclusions. As one of the key equipment in the power system, the inverter of power substation has a wide range of application prospects. With the continuous development of the power system and the continuous progress of new energy technology, the demand for power substation inverters will continue to grow. In the future, inverter technology will continue to develop, continuously improve the performance of conversion efficiency, reduce costs, improve reliability, etc., and make greater contributions to the sustainable development of the power system.