研究目的
To present a comparative analysis of different low voltage ride through (LVRT) strategies for grid-connected photovoltaic (PV) systems under low voltage conditions, highlighting the impact of network transients on their performance.
研究成果
The comparative analysis indicates that while all three LVRT approaches enhance the capability of PV systems under low voltage conditions, their performance is affected by network transients. The SDBR approach ensures improved DC-link voltage at the expense of reduced output power. Multi-mode operation does not require additional circuitry but has poor DC-link voltage regulation and is adversely affected by network transients. The chopper-based control schemes offer a trade-off between multi-mode operation and SDBR scheme.
研究不足
The study highlights the impact of network transients on the performance of LVRT techniques, which is not typically considered in traditional evaluations. The performance of multi-mode operation is adversely affected by network transients, and choosing the value of resistance in SDBR and chopper-based control schemes is non-trivial.
1：Experimental Design and Method Selection:
The study compares different LVRT techniques for grid-connected PV systems, including series dynamic breaking resistor, chopper circuit across the DC bus, and multi-mode operation of PV system. The performance is evaluated under ideal voltage dip and considering network transients on the CERTS testbed.
2：Sample Selection and Data Sources:
A 20.7 kW PV system is used for simulation, with specifications provided in the paper.
3：7 kW PV system is used for simulation, with specifications provided in the paper.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The study involves a grid-connected PV system with DC/DC converter, inverter, and associated LCL filter. The CERTS microgrid testbed is used for evaluating performance under network transients.
4：Experimental Procedures and Operational Workflow:
Simulations are carried out using Simulink for two scenarios: ideal voltage dip at the point of common coupling (PCC) and considering network transients by increasing load on the CERTS microgrid.
5：Data Analysis Methods:
The performance of LVRT techniques is analyzed based on PV array power, d-axis current, active power to the grid, q-axis current, reactive power to the grid, and DC-link voltage. Harmonic components and total harmonic distortion (THD) of injected currents are also evaluated.
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