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首页> 外文会议>IEEE International Conference on Clean Energy and Energy Efficient Electronics Circuit for Sustainable Development >Low Voltage Ride-Through Capability Enhancement of Grid-Connected Photovoltaic Systems- A Hybrid Control Approach
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Low Voltage Ride-Through Capability Enhancement of Grid-Connected Photovoltaic Systems- A Hybrid Control Approach

机译：并网光伏系统的低压穿越能力增强-混合控制方法

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摘要

Under the demands of contemporary grid code (GC), the solar PV system should stay attached to the grid for a certain time period depend on the voltage sag level under the fault condition. The voltage of the point of common coupling (PCC) is very low when the fault appears on the grid side, resulting in a very high DC connection voltage for the power balance. This high voltage of the intermediate circuit can damage the drive. Moreover, the deflection of the voltage will cause the PV plant to be disconnected from the network based on the modern GCs. This study proposes a hybrid control approach for the two-stage grid-integrated solar PV system to enhance low voltage ride through (LVRT). The hybrid control approach proposed consists of a braking chopper and a neutral connected braking resistor (NCBR).The braking chopper resistance absorbs the excess energy in DC link capacitor during the fault, which will regulate the DC-link overvoltage. The NCBR is stabilized the impact of grid faults and therefore the voltage sag is improve in the grid side, which is boost the PV system's LVRT capability. For this work, the algorithm of synchronization evolved to trigger both controls simultaneously under the fault. Simulations are carried out using the MATLAB/Simulink software under all types of fault and results indicate that the proposed hybrid control scheme can enhance the LVRT capability of the system.
机译：在现代电网规范（GC）的要求下，取决于故障条件下的电压骤降水平，太阳能光伏系统应在一定时间内保持与电网的连接。当故障出现在电网侧时，公共耦合点（PCC）的电压非常低，从而导致功率平衡所需的直流连接电压很高。中间电路的高压会损坏驱动器。此外，基于现代GC，电压的偏移将导致光伏电站与网络断开。这项研究提出了一种用于两级并网太阳能光伏系统的混合控制方法，以增强低压穿越（LVRT）。提出的混合控制方法由制动斩波器和中性线连接的制动电阻器（NCBR）组成。制动斩波器电阻吸收故障期间直流母线电容器中的多余能量，从而调节直流母线过电压。 NCBR可以稳定电网故障的影响，因此可以改善电网侧的电压骤降，从而提高了光伏系统的LVRT能力。对于这项工作，同步算法演变为在故障下同时触发两个控件。使用MATLAB / Simulink软件对所有类型的故障进行了仿真，结果表明所提出的混合控制方案可以增强系统的LVRT能力。

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