On-line automatic decoupling and parallel control method of power modules of modular active power filter

Abstract

The invention provides an online automatic splitting and paralleling control method for power modules of a modular active power filter. Through adoption of a wireless control strategy, power modules of the modular active power filter APF are mutually independent and do not communicate with each other. According to the modular APF, the automatic online splitting and paralleling control over the power modules is realized based on harmonic load change condition and a device operation efficiency optimization rule. According to the method, the automatic splitting and paralleling control over the power modules is automatically realized according to the harmonic load change, the capacity configuration of a device is optimized, the power loss of the device is reduced, and the operation efficiencyof the device is improved. Through adoption of the wireless paralleling control strategy, the modules do not communicate with each other, so the defects that relatively many system communication connection wires exist, the control is complex, the hardware cost is high, and particularly the reliability is low in the traditional wire control method are overcome.

Description

technical field [0001] The invention relates to a power module online automatic decoupling and parallel control method of a modular active power filter. Background technique [0002] At present, with the rapid development of power electronic technology, more and more high-power nonlinear power electronic loads are put into the distribution network operation, causing a large number of harmonics to flow into the power grid, seriously affecting the power quality of the distribution network. Taking the fast-growing electric vehicle charging station as an example, the intensive operation of high-power electronic charging devices in the charging station will generate volatility, impact harmonics and reactive current, which seriously deteriorates the power quality of the grid. Therefore, it is necessary to take practical and effective power quality control measures to ensure the safe and reliable operation of the power grid. Due to its advantages of easy capacity expansion, fault ...

AI Technical Summary

Problems solved by technology

This type of control method has a high degree of synchronization and coordination. The main problem is that when the main controller fails, the entire control system will be paralyzed, failure redundancy cannot be achieved, and reliability is poor.

Moreover, there are mutual communication links between modules, on the one hand, it will increase the hardware cost and complexity of the control system; on the other hand, the electromagnetic interference introduced by communication lines will further enhance the interaction between modules, reducing the reliability of the system and module independence

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