Internal Model Power Synchronization Control of a PV-Based Voltage-Source Converter in Weak-Grid and Islanded Conditions
The power synchronization control strategy for grid-connected voltage-source converters (VSCs) provides an operation similar to synchronous machines. It is able to avoid the instability caused by a standard phase-locked loop in integration into weak grids. However, the non-minimum phase phenomenon in the developed dynamics places a fundamental limitation on the ac system's stability. This paper proposes a one-degree-of-freedom internal-model-based control methodology. It introduces a control approach to incorporate the dynamics of the system's nominal model in the control structure. It also rectifies the unwanted effects of the right-half plane zeros. The explicit incorporation of the model enhances the tracking capabilities of the controller in a PV-based VSC. Besides, this article shows that a single-loop of control will suffice to regulate active and reactive power. Validating results are generated via a hardware-in-the-loop system based on a Xilinx Zynq-7000 SoC field-programmable gate array (FPGA). Furthermore, experimental results are conducted for low-power prototyping to examine the satisfactory performance of the proposed control architecture.
S. Yazdani et al., "Internal Model Power Synchronization Control of a PV-Based Voltage-Source Converter in Weak-Grid and Islanded Conditions," IEEE Transactions on Sustainable Energy, vol. 12, no. 2, pp. 1360 - 1371, Institute of Electrical and Electronics Engineers (IEEE), Dec 2020.
The definitive version is available at https://doi.org/10.1109/TSTE.2020.3045167
Electrical and Computer Engineering
Intelligent Systems Center
Keywords and Phrases
Direct Power Control; Fault Ride-Through; Internal Model Control (IMC); Low Damping (LD); Maximum Power Point Tracking (MPPT); Non-Minimum Phase (NMP); Phase-Locked Loop; Point Of Common Coupling (PCC); Power System Stability; Reactive Power; Regulators; Right-Half Plane (RHP); Stability Analysis; Synchronization; Transfer Functions; Voltage Control; Voltage-Source Converter (VSC)
International Standard Serial Number (ISSN)
Article - Journal
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16 Dec 2020