发明名称 |
Method and arrangement for estimating angular frequency |
摘要 |
An exemplary method and arrangement for estimating the frequency and the positive sequence of a fundamental component of a measured three-phase voltage are disclosed (ναβ). The method includes measuring the three-phase voltage (ναβ), calculating estimates of a fundamental frequency voltage component ({circumflex over (ν)}αβ,1) and a difference ({circumflex over (φ)}αβ,1) between positive and negative sequence components of the fundamental frequency voltage from an error ({tilde over (ν)}αβ) between the measured three-phase voltage (ναβ) and at least one of the calculated estimates of the fundamental frequency voltage component ({circumflex over (ν)}αβ,1) and from an estimate of the angular frequency ({circumflex over (ω)}0) of the fundamental frequency voltage component, wherein the estimate of the angular frequency ({circumflex over (ω)}0) of the fundamental frequency voltage component is calculated from at lest one of the estimated differences ({circumflex over (φ)}αβ,1) and from the error ({tilde over (ν)}αβ) between the measured three-phase voltage and at least one of the calculated estimates of the fundamental frequency voltage component. |
申请公布号 |
US8751177(B2) |
申请公布日期 |
2014.06.10 |
申请号 |
US201113075827 |
申请日期 |
2011.03.30 |
申请人 |
ABB Research Ltd. |
发明人 |
Escobar Gerardo;Coccia Antonio;Serpa Leonardo-Augusto;Pettersson Sami;De-Novaes Yales |
分类号 |
G06F19/00;G01R23/02 |
主分类号 |
G06F19/00 |
代理机构 |
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代理人 |
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主权项 |
1. A method for estimating the frequency of a measured three-phase voltage (ναβ) comprising:
measuring the three-phase voltage; and calculating estimates of a fundamental frequency voltage component ({circumflex over (ν)}αβ,1) and a difference ({circumflex over (φ)}αβ,1) between positive and negative sequence components of a fundamental frequency voltage, from an error ({tilde over (ν)}αβ) between the measured three-phase voltage (ναβ) and at least one of the calculated estimates of the fundamental frequency voltage component ({circumflex over (ν)}αβ,1) and from an estimate of an angular frequency ({circumflex over (ω)}0) of the fundamental frequency voltage component; generating at least a clean electrical signal corresponding to the measured three-phase voltage based on the estimates of the fundamental frequency voltage component ({circumflex over (ν)}αβ,1) wherein the estimate of the angular frequency ({circumflex over (ω)}0) of the fundamental frequency voltage component is calculated from at least one of the estimated differences ({circumflex over (φ)}αβ,1) and from the error ({tilde over (ν)}αβ) between the measured three-phase voltage and at least one of the calculated estimates of the fundamental frequency voltage component.
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地址 |
Zürich CH |