A Method of Inverter Power Control Based on Equivalent Input Disturbance

Abstract

The invention provides an inverter power control method based on equivalent input interference, which includes: simplifying the grid-connected inverter circuit, and obtaining each electrical quantity of the circuit according to the simplified circuit, and harmonizing the voltage drop The wave quantity is regarded as the external disturbance quantity, and the external disturbance quantity can be equivalent to the disturbance existing in the control input channel by the equivalent input disturbance method, and the system state space expression including the equivalent input disturbance quantity is obtained; based on the single-phase pq theory, the The voltage and current on the grid side get its virtual signal through the orthogonal signal generator, so as to obtain the calculation formula of the reference current signal. According to the actual measured voltage and current on the grid side and the requirements of MPPT / LVRT, the reference value of the power injected into the grid by the system is obtained, and the given power reference value is obtained. The actual reference current signal of the inverter current controller is obtained; the current controller is designed based on the EID method. Beneficial effects of the present invention: the designed current controller can ensure stable active power / reactive power flow between the microgrid and the public grid.

Description

technical field [0001] The invention relates to the technical field of microgrid power control, in particular to an inverter power control method based on equivalent input disturbance. Background technique [0002] With the increase of power demand in today's society, the traditional centralized power grid has risks such as high power supply pressure and high energy loss. As a small integrated energy system, the micro-grid uses distributed power to generate power, which can greatly reduce the power supply pressure of the traditional power grid. [0003] With the current maturity of renewable energy power generation technology and the trend of cost reduction, the penetration rate of microgrid in the distribution network is on the rise, making microgrid grid-connected face the challenge of how to ensure reliable, sustainable and stable operation. At the same time, the public grid Fluctuating factors such as voltage drop on the side will also affect the stable operation of micr...

AI Technical Summary

Problems solved by technology

[0003] With the current maturity of renewable energy power generation technology and the trend of cost reduction, the penetration rate of microgrid in the distribution network is on the rise, making microgrid grid-connected face the challenge of how to ensure reliable, sustainable and stable operation. At the same time, the public grid Fluctuating factors such as voltage drop on the side will also affect the stable operation of microgrid grid-connected power generation

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