Inverter power control method based on equivalent input interference

Abstract

The invention provides an inverter power control method based on equivalent input interference. The method comprises the following steps of simplifying a grid-connected inverter circuit; obtaining each electrical quantity of the circuit according to the simplified circuit, regarding the voltage drop quantity and the harmonic quantity as the external disturbance quantities, enabling the external disturbance quantities to be equivalent to the disturbance existing in a control input channel by an equivalent input disturbance method, and obtaining a system state space expression containing the equivalent input disturbance quantities; based on a single-phase pq theory, enabling the voltage and current of a power grid side to pass through an orthogonal signal generator to obtain the virtual signals of the voltage and current so as to obtain a reference current signal calculation formula, obtaining a system injection power grid power reference value according to the actually measured grid-side voltage and current and MPPT / LVRT requirements, and obtaining an actual reference current signal of an inverter current controller through a given power reference value; and designing a current controller based on an EID method. The invention has the beneficial effect that the designed current controller can ensure stable the active power / reactive power flow between a microgrid and a public power 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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