Identifying DQ-Domain Admittance Models of a 2.3-MVA Commercial Grid-Following Inverter via Frequency-Domain and Time-Domain Data
Identifying DQ-Domain Admittance Models of a 2.3-MVA Commercial Grid-Following Inverter via Frequency-Domain and Time-Domain Data
复制标题
通过频域和时域数据识别 2.3 MVA 商用并网逆变器的 DQ 域导纳模型
DOI：
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发表时间：
2021
影响因子：
4.9
通讯作者：
V. Gevorgian
中科院分区：
文献类型：
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作者：
Lingling Fan;Zhixin Miao;Przemyslaw Koralewicz;Shahil Shah;V. Gevorgian
在本文中，我们提出了两种方法来识别一个2.3 MVA的商业并网逆变器的导纳，通过频域数据和时域数据。除了众所周知的谐波注入法，以获得导纳的频率点，其次是矢量拟合，我们采用了阶跃响应为基础的方法，其中的阶跃响应的转换器的数据收集和他们<inline-formula><tex-math notation="LaTeX">的$s$</tex-math></inline-formula>-域表达式得到。进而建立了变换器<inline-formula><tex-math notation="LaTeX">的s</tex-math></inline-formula>域导纳模型，这两种方法可用于交叉验证。比较了两种方法得到的阶跃响应和频域响应。结果表明，时域数据为基础的方法导致的导纳可比从频域测量在小于60 Hz的范围内。此外，从频域导纳测量获得两个见解。首先，当<inline-formula><tex-math notation="LaTeX">$dq$</tex-math></inline-formula>坐标系与公共耦合点（PCC）电压对齐时，每单位DQ域导纳直接反映操作条件。第二，可以通过序列域导纳检测负序控制的存在。
In this paper, we present two methods to identify the admittance of a 2.3-MVA commercial grid-following inverter through frequency-domain data and time-domain data. In addition to the well-known harmonic injection method to obtain the admittance at frequency points followed by vector fitting, we adopt a step response-based method where the step response data of the converter are collected and their <inline-formula><tex-math notation="LaTeX">$s$</tex-math></inline-formula>-domain expressions are obtained. In turn, the <inline-formula><tex-math notation="LaTeX">$s$</tex-math></inline-formula>-domain admittance model of the converter is found. The two methods can be used for cross validation. Step responses and frequency-domain responses obtained from the two methods are compared. Results show that the time-domain data-based method leads to an admittance comparable with that from the frequency-domain measurement in the range less than 60 Hz. In addition, two insights are obtained from the frequency-domain admittance measurements. First, when the <inline-formula><tex-math notation="LaTeX">$dq$</tex-math></inline-formula>-frame is aligned to the point of common coupling (PCC) voltage, the per unit DQ-domain admittance directly reflects operating conditions. Second, existence of negative-sequence control can be detected via sequence-domain admittances.