TRANSIENT STEADY STATE COMPENSATION STRATEGY FOR PARALLEL INVERTERS BASED ON RESIDUAL GENERATOR

Hu Changbin; Wang Gaowei; Luo Shanna; Lu Heng; Li Xuecheng

doi:10.19912/j.0254-0096.tynxb.2023-0456

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (7) : 286-293. DOI: 10.19912/j.0254-0096.tynxb.2023-0456

TRANSIENT STEADY STATE COMPENSATION STRATEGY FOR PARALLEL INVERTERS BASED ON RESIDUAL GENERATOR

Hu Changbin, Wang Gaowei, Luo Shanna, Lu Heng, Li Xuecheng

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Abstract

A transient steady-state performance compensation control strategy based on residual generator is proposed to address the power quality issues caused by disturbances such as load switching and unbalanced loads in island microgrids, as well as the reactive power imbalance caused by line impedance mismatch. Design of residual generator based on the state space model of each inverter in the inverter parallel system, generate residual r（s）, and generate fundamental and non fundamental residuals through low-pass and high-pass filters. Then, from the perspective of disturbance and line voltage drop cancellation, transient compensation controller Q₁（s） and steady-state compensation controller Q₂（s） are designed, and the specific expressions of the two controllers are derived based on local information to achieve disturbance suppression and reactive power sharing of the inverter parallel system, suppress circulating currents, and compensate for line voltage drop. Finally, the experiments verify the effectiveness of the proposed strategy.

Key words

microgrids / inverters / power quality / disturbance rejection / reactive power / residual / circulation

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Hu Changbin, Wang Gaowei, Luo Shanna, Lu Heng, Li Xuecheng. TRANSIENT STEADY STATE COMPENSATION STRATEGY FOR PARALLEL INVERTERS BASED ON RESIDUAL GENERATOR[J]. Acta Energiae Solaris Sinica. 2024, 45(7): 286-293 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0456

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