Integrated power quality adjustment control method and device

Abstract

The invention relates to a unified power quality control approach and the device thereof. The device comprises a parallel converting-bridge, a series converting-bridge, a DC power source as well as a third converting-bridge. The approach comprises the steps that: the compensation for a variable value to gain a power grid; the compensation for a voltage distortion as well as a target current value and the change ratio of both the voltage distortion and the target current value are input taken as a controller; the fuzzy control rule base and membership function parameter to be adjusted are selected as antibodies; the optimized important parameter of the fuzzy controller is realized through an immunity genetic algorithm; a SVPWM drive signal is generated and drives the series / parallel active filter power component; the difference value of the required capacitor voltage value and the actual capacitor voltage tested by a Hall sensor is applied to a PI algorithm; the SVPWM drive signal is generated again to drive the third converting-bridge power component. The invention combines the genetic algorithm, the immunity algorithm and the fuzzy algorithm; therefore, the robustness and the dynamic-static performance of the controller have been remarkably enhanced.

Description

technical field [0001] The invention relates to an AC power distribution technology, and further relates to a unified power quality adjustment control method and device. Background technique [0002] In recent years, with the rapid development of power electronic technology, various power electronic devices have been widely used in power systems, industries, transportation and households. While improving people's production and quality of life, they have also added a lot of power to the power grid. Non-linear loads, especially the widespread use of large-capacity converter equipment, lead to the injection of a large number of harmonics into the grid, distorting the grid voltage and current waveforms. The deteriorating power quality of the power grid in turn seriously threatens the safe operation and normal use of user equipment, especially for those highly automated equipment such as frequency conversion speed control equipment, robots, automated production lines, precision ...

AI Technical Summary

Problems solved by technology

But there are still some problems: because the membership function and the fuzzy control rules are not relatively independent but interrelated, so to obtain a high-performance fuzzy controller, both should be optimized at the same time, but there is also the problem of too large a search space. , and the defects of the standard genetic algorithm, such as premature convergence and inability to maintain the diversity of individuals, also affect the correctness and effectiveness of these optimal designs

Images