Adaptive control method of power factor

Abstract

The invention discloses an adaptive control method of a power factor. The adaptive control method comprises the following steps of: generating three voltage reference values by calculating, multiplying the three voltage reference values, taking a product of the three voltage reference values as a current reference value, comparing the current reference value with a direct current bus current, and outputting a calculation result after carrying out current error compensation processing; determining a duty ratio by virtue of the calculation result to form a pulse signal, controlling the make-break operation of a chopper to carry out chopping processing on a direct current voltage rectified and output by a rectifier bridge, generating a smooth direct current bus current and an alternating current input current in a same phase with an alternating current input voltage, improving the power factor, and reducing the current harmonic distortion ratio. A power factor correction method, provided by the invention, can be used for realizing the adaptive control on alternating current power supplies in different frequencies. The adaptive control method of the power factor is applied into variable frequency air conditioner products, and can be suitable for air conditioners based on inputs of 50-Hz and 60-Hz alternating current power supplies; and according to the adaptive control method of the power factor, a design purpose that a development is suitable for multiple types of machines is really achieved, the development period is shortened, and the research and development costs are lowered.

Description

technical field [0001] The invention belongs to the technical field of power system control, and in particular relates to a control method for improving the power factor of the power system. Background technique [0002] In the power system, there are usually two elements in the quantitative measurement of power quality, namely power factor (Power Factor, PF) and total harmonic distortion (Total Harmonic Distortion, THD). Most power electronic equipment will cause different degrees of interference to the power system during the application process, especially the power equipment that needs to be converted, such as rectifiers, UPS systems, frequency conversion drive systems, thyristor systems, etc. The current output after conversion is usually For intermittent, short-lived high-peak current pulses, the resulting circuit loss, total harmonic content and radiated interference will all increase significantly. [0003] In order to improve the utilization rate of the power syste...

AI Technical Summary

Problems solved by technology

For example: my country currently uses 50Hz AC power supply, and the PFC technology proposed for domestic models is only suitable for power factor correction of 50Hz AC power supply

For countries that use 60Hz AC power supply, these PFC technologies are not applicable

This has greatly restricted the application of PFC technology in export products, requiring technicians to redesign the PFC technology suitable for 60Hz AC power supply for export models, resulting in a series of long research and development cycles and low production efficiency. question

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