Why is the harmonic current on the null line mainly three times? This is due to two reasons: (1) Among the harmonic components generated by single-phase rectifier circuit, the third harmonic is the largest, and the distortion rate of the third harmonic usually reaches more than 80%. (2) The harmonic current of other times will have the effect of canceling on the zero line, onl...
3 phase load current imbalance In three phase systems, current unbalance is defined as the maximum deviation of any phase current from average divided by average current. Current unbalance can occur due to reasons within the control of the end user or outside the control of end user. Some of the reasons for current unbalance (or imbalance) are: Source voltage from the electric utility is unbalance...
Research background Because the value of harmonic loss is smaller than that of fundamental loss and the calculation is difficult, it is generally ignored in the theoretical calculation of line loss. However, with the development of power electronics technology, the nature of power generation and electrical equipment is becoming increasingly complex, and various nonlinear components put into ...
With the development of society and the increase of demand for electricity, Reactive power compensation technology has developed rapidly, including Static VAR Compensation and Dynamic Reactive Power compensation, and has gained rich operating experience. However, some problems have also been exposed in practice. Some reactive power compensation devices are inconvenient to move, and the equipment m...
The utility model patent discloses an Enhanced Active Power Filter with a three-phase unbalance adjustment function. The IGBT converter of the Enhanced Active Power Filter is a three-level three-phase four-wire four-arm PWM transformer. The fourth bridge arm is connected in parallel with the remaining three bridge arms, and the midpoint of the fourth bridge arm is connected to the neutra...
The existing power grid is usually equipped with a large number of nonlinear electronic components. These nonlinear electronic components will generate corresponding harmonics during the working process, among which high-order harmonics will interfere with the electrical equipment in the power grid and seriously affect the power supply. Power quality in the grid. In order to reduce the adverse eff...
Due to the rapid development of power electronic technology, the nonlinear characteristics of industrial and agricultural power loads, especially transportation and civil electrical products are becoming more and more serious, and the power factor of users is also declining. Therefore, reactive power compensation devices are more and more widely used. The power compensation device is used to suppl...
What is the power quality problems at sites with welding machines? The most common power quality problems associated with welding machines are voltage sags, harmonic pollution, and electromagnetic interference. Voltage sags can cause the welding machine to operate at a lower than expected output, resulting in poor weld quality. Harmonic distortion pollution can cause interference with other equipm...
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