Study on system stability of photovoltaic power stations based on feedforward power decoupling control

doi:10.3969/j.issn.2097-0706.2023.03.003

Abstract

Abstract:

In the context of constructing a new power system with new energy as the main body and realizing the green and low-carbon transition of energy mix， photovoltaic（PV） power stations are connecting to the power grid relying on a large number of power electronic devices. New energy gradually replaces conventional synchronous units， posing new challenges to the stable operation of the grid. PV grid-connected inverter shows nonlinear coupling and dynamic interaction with the power grid，which brings new disturbance factors and security problems to the grid.Based on the characteristics of dual loop decoupling control on grid-connected inverter power， the anti-disturbance ability of grid-connected system can be improved by additional target control of PV power stations. The mechanism of the positive damping torque provided by the additional control of PV power stations running in parallel with the synchronous machine is deduced. The additional damping control strategy for grid-connected inverters based on the feedforward power decoupling control（FPD） is designed. The controller parameters are adjusted by the damping torque coefficient method to suppress the power oscillation of the system. Taking a PV power station as an example， the modeling of PV power station merging into a "four unit two area" power grid was completed on Digsilent platform， and the accuracy of the proposed method was verified by simulation.

Key words: PV power station, feedforward power decoupling, damping torque, power oscillation, stability of power grid, green and low-carbon transition, inverter, new power system

CLC Number:

TK01

LIU Huiqiang, GUO Yu, XING Huadong, MU Teng, LIU Jianqiang, ZHANG Aijun. Study on system stability of photovoltaic power stations based on feedforward power decoupling control[J]. Integrated Intelligent Energy, 2023, 45(3): 17-23.

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