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Coordinative Low-Voltage-Ride-Through Control for the Wind-Photovoltaic Hybrid Generation System
摘要： The wind-photovoltaic (PV) hybrid renewable energy system (HRES), which consists of permanent magnet synchronous generators (PMSG) and PV arrays, is becoming a cost-effective electric source for powering islanded areas. However, high penetration of renewables makes the power system vulnerable to transient voltage faults, which undermines the stability of the future inverter-dominated grid. To address this issue, a coordinative low-voltage-ride-through (LVRT) control scheme is proposed for the operation of the wind-PV HRES in this paper. This control scheme will exploit the maximum energy inertia of the HRES for incorporating the power imbalance between the faulted grid and the renewable generators. An optimization problem is formulated to maximize the renewable energy harvesting within the operational and environmental limitations. To cope with different working conditions, four control processes are coordinated in an optimized manner during the LVRT period, namely (i) Adaptive DC-link voltage control, (ii) PMSG rotating speed control, (iii) PV energy curtailment control, and (iv) Blade pitch angle control. Besides, this control scheme applies a direct output control that can generate stable and accurate current as per grid code requirements. The results of the hardware-in-the-loop (HIL) experiment and the MATLAB-Simulink simulation are provided to verify the effectiveness of the proposed control scheme.
关键词： power system faults,Hybrid renewable energy system,low-voltage-ride-through,smart grid
更新于2025-09-12 10:27:22
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Grid-Connected Photovoltaic Power Plant without Phase Angle Synchronization Able to Address Fault Ride-Through Capability
摘要： This paper discusses the control of large-scale grid-connected photovoltaic power plants (GCPPPs) operating under unbalanced grid voltage sags. The positive and negative sequences of the output currents are controlled to achieve different targets: injecting constant power (i) to the grid, or (ii) to the ac side of the converter, i.e., including the filter and the grid. Traditionally, synchronization with the grid voltages is required, which is usually performed by a phase-locked-loop (PLL) technique. In this paper, the proposed control technique does not require any grid voltage synchronization. An arbitrary angle is used instead with the only requirement of having a frequency equal or close to the grid frequency. The fault-ride-through capability of the GCPPP during unbalanced voltage sags is addressed by proposing a current limiter. Simulation and experimental results verify the performance of the proposed GCPPP.
关键词： Power system faults,Phase locked loops,Photovoltaic systems,Fault current limiters
更新于2025-09-11 14:15:04