V/f-PQ type micro-grid inverter power supply with hysteretic characteristics

Abstract

The invention discloses a V / f-PQ type micro-grid inverter power supply with hysteretic characteristics. The V / f-PQ type micro-grid inverter power supply comprises a signal input module, a V / f-PQ hysteretic control module, a double-feedback decoupling PWM (pulse width modulation) control module, an output driving module and a VSC main circuit, wherein the signal input module respectively outputs received first voltage signals and current signals, the V / f-PQ hysteretic control module outputs frequency signals or active power signals and reactive power signals or second voltage signals to the double-feedback decoupling PWM control module after processing the received first voltage signals and the first current signals, the double-feedback decoupling PWM control module outputs a PWM control pulse to the output driving module, the output driving module outputs driving signals to the VSC main circuit, and when the VSC main circuit receives the driving signals, the externally input direct current is converted into alternating current to be output. The V / f-PQ type micro-grid inverter power supply has the advantages that different threshold values and loop width are set for different power supplies, the false triggering possibly caused on a controller by normal fluctuation of a system can be effectively avoided, and the power supply is prevented from fluctuating and repeatedly changing in the range of a certain value.

Description

technical field [0001] The invention relates to the field of micro-grid control, in particular to a V / f-PQ type micro-grid inverter power supply with hysteresis characteristics. Background technique [0002] Conventional grids have grown rapidly over the past few decades as demand for electricity continues to grow. However, due to its high cost, difficult operation, fuel shortage, and increasing environmental pollution, the development of environmentally friendly, flexible, and renewable energy-based distributed power generation technologies has been promoted. In order to give full play to the advantages of distributed power generation and solve the contradictions between the large power grid and it, the distributed power generation system is generally interconnected to form a micro-grid. However, with the access of the microgrid, some new problems have emerged, mainly in what kind of control method the microgrid adopts in the island operation mode to maintain the stable op...

AI Technical Summary

Problems solved by technology

However, this switching will cause a large frequency or voltage disturbance, the operation flexibility is insufficient, and the controller is prone to false triggering

Images