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.
- 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)
Available at: http://works.bepress.com/mehdi-ferdowsi/199/