A New Stability Enhancement Method Using KF Estimation for the PWM-SMC-Based Grid-Tied Inverter under Weak Grid Condition

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Bolin Chen
  • Weimin Wu
  • Chunxiao Gao
  • Mohamed Orabi
  • Eftichis Koutroulis
  • Frede Blaabjerg

Detail(s)

Original languageEnglish
Journal / PublicationIEEE Journal of Emerging and Selected Topics in Power Electronics
Online published30 May 2022
Publication statusOnline published - 30 May 2022

Abstract

Sliding mode control (SMC) technology is widely used in LCL-filtered grid-tied inverters (GTI) due to its strong robustness against parameter drift. However, under weak grid conditions, the steady performance of GTI using conventional pulse-width-modulation-based SMC (PWM-SMC) degrades, resulting in increased harmonics in grid-injected currents. One reason is that the voltage feedforward term at the point of common coupling (PCC) in the sliding mode control loop causes the phase margin of the inverter output impedance to decrease. Another reason is that the gain of conventional PWM-SMC based systems is not high enough, especially under weak grid conditions. This paper proposes a PCC feed-forward voltage reconstruction method (named KF-PWM-SMC) for a PWM-SMC based controller using Kalman filter (KF) estimation. As a result, the phase and magnitude of the inverter output impedance at the desired frequency can be significantly improved. Moreover, the proposed PCC feedforward voltage extraction method can save the PCC voltage control sensor, thereby improving the reliability of the whole system. A 3 kW experimental GTI based on the dSPACE DS1202 platform has been developed to verify the feasibility of the proposed control strategy.

Research Area(s)

  • Capacitors, Feedforward systems, Grid-tied inverter, Impedance, Inverters, Kalman filter, LCL filter, PCC voltage feedforward, Power harmonic filters, Power system stability, SMC, Voltage control, Weak grid

Citation Format(s)

A New Stability Enhancement Method Using KF Estimation for the PWM-SMC-Based Grid-Tied Inverter under Weak Grid Condition. / Chen, Bolin; Wu, Weimin; Gao, Chunxiao; Orabi, Mohamed; Koutroulis, Eftichis; Chung, Henry; Blaabjerg, Frede.

In: IEEE Journal of Emerging and Selected Topics in Power Electronics, 30.05.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review