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Online Grid Impedance Measurement Using Discrete-Interval Binary Sequence Injection

机译：使用离散间隔二进制序列注入的在线电网阻抗测量

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摘要

Grid impedance affects the stability and control performance of grid-connected power electronic devices, such as inverters used to integrate wind and solar energy. Adaptive control of such inverters, to guarantee stability under different grid conditions, requires online measurement of the grid impedance performed in real time. Such online measurement can be performed by injecting a current perturbation from the inverter into the grid and by reading the grid voltage responses. To minimize the impact on the inverter operation, the injection must be kept as small as possible while producing enough voltage perturbation that can be reliably measured and processed to extract its various frequency components. This paper proposes the use of a discrete-interval binary sequence (DIBS) for this application to minimize the injection. The DIBS is a computer-optimized binary sequence, where the energy is maximized at specified harmonic frequencies based on the expected grid-impedance characteristics. Experimental results based on a three-phase grid-connected inverter are presented to demonstrate the effectiveness of the proposed methods.
机译：电网阻抗会影响并网的电力电子设备（例如用于集成风能和太阳能的逆变器）的稳定性和控制性能。为了保证不同电网条件下的稳定性，此类逆变器的自适应控制需要实时在线测量电网阻抗。可以通过将电流扰动从逆变器注入电网并读取电网电压响应来执行这种在线测量。为了将对逆变器运行的影响降到最低，必须在产生足够的电压扰动的同时保持尽可能小的注入，可以可靠地对其进行测量和处理以提取其各种频率分量。本文建议对此应用程序使用离散间隔二进制序列（DIBS），以最大程度地减少注入。 DIBS是计算机优化的二进制序列，其中基于预期的电网阻抗特性，在指定的谐波频率下使能量最大化。提出了基于三相并网逆变器的实验结果，以证明所提方法的有效性。

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