APF current prediction control method for self-adaptive regulation of direct-current-side voltage based on internet

Abstract

The invention belongs to the technical field of current prediction and discloses an APF current prediction control method for self-adaptive regulation of direct-current-side voltage based on internet. A dynamically compensated current signal is connected with a server through a signal line, and the server transmits the signal to a power grid monitoring terminal through the internet to achieve real-time monitoring. Timely sending of predicting results to the terminal is achieved through the internet, convenience is brought to a worker for timely knowing, and the operating safety and stability of equipment are improved. The method is achieved based on prediction control, does not need a complicated modulation link of a PWM method, and a structure is simple. Self-adaptive regulation of APF direct-current-side voltage is achieved, the direct-current-side voltage can be adjusted according to compensating current and power grid voltage in real time, smaller current ripples and power loss are kept while APF output performance is ensured, and the APF compensating performance.

Description

technical field [0001] The invention belongs to the technical field of current prediction, and in particular relates to an Internet-based DC side voltage self-adaptive adjustment APF current prediction control method. Background technique [0002] Harmonic or reactive currents generated by nonlinear loads will degrade the power quality of the power grid, affect social production and life, and cause economic losses. In the case of complex and time-varying harmonic or reactive current components, the traditional LC passive filter is increasingly unable to meet the power quality requirements of the power system. The active power filter (Active Power Filter, APF) effectively overcomes the shortcomings of the traditional method and has become an important way to compensate harmonic or reactive current. It injects a compensation current opposite to the direction of the current to be compensated into the grid, so that the power supply only outputs The fundamental wave current or t...

AI Technical Summary

Problems solved by technology

[0003] To sum up, the problem in the existing technology is that the traditional control method of AP cannot dynamically adjust the DC side voltage, which leads to the decline of APF compensation performance when the power system working condition changes.

Images