# Recognition Algorithm of Transient Overvoltage Characteristic Based on Symmetrical Components Estimation

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## Abstract

**:**

## 1. Introduction

## 2. Definition of the Algorithm

#### 2.1. Generation Mechanism of Transient Overvoltage

#### 2.2. Measuring Method of Transient Overvoltage

#### 2.3. Symmetrical Components Estimation of Three-Phase Vector of Transient Overvoltage

#### 2.4. Confirmation of Effective Value and Phase Jump of Transient Overvoltage

## 3. Experimental Analysis

#### 3.1. Analysis on Extraction Ability of Symmetrical Components

#### 3.2. Characteristic Recognition on Effective Value and Phase Jump of Positive-Sequence of Transient Overvoltage

- (1)
- Actuation time ${t}_{1}$. It is the time that effective value curve of the detected positive-sequence component crossing the 90% normal voltage fundamental wave takes from the moment when the transient overvoltage occurs or ends.
- (2)
- Adjustment time ${t}_{2}$. It is the time that effective value curve of the positive-sequence component entering and maintaining within ±3% error range of effective value of actual positive sequence component takes from the moment when the transient overvoltage occurs or ends.
- (3)
- Effective value precision ${\sigma}_{1}$. It is the maximum deviation between the detected fundamental wave effective value and the actual fundamental wave effective value after the transient overvoltage is stable experiencing the adjustment time ${t}_{2}$ test, which is represented as percentage of the actual fundamental wave effective value.
- (4)
- Phase position precision ${\sigma}_{2}$. It is the maximum deviation between the detected fundamental wave phase position and the actual fundamental wave phase position after the transient overvoltage is stable experiencing the adjustment time ${t}_{2}$ test, which is represented as percentage of the actual phase jump.

#### 3.3. Recognition of Waveform Characteristics of Transient Overvoltage

## 4. Discussion

## 5. Conclusions

## Author Contributions

## Funding

## Conflicts of Interest

## References

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**Figure 8.**Probability distribution of maximum transient overvoltage without pre-charging DC voltage.

Recognition Algorithm | Algorithm in This Paper | Dq Transform Algorithm | |
---|---|---|---|

Starting process of transient overvoltage | t_{1}/ms | 1.19 | 5.02 |

t_{2}/ms | 14.19 | 13.01 | |

Transient overvoltage recovery process | t_{1}/ms | 5.38 | 10.19 |

t_{2}/ms | 14.57 | 20.79 | |

σ_{1} | Less than 1 | 3.58 | |

σ_{2} | Less than 1 | 11.88 |

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**MDPI and ACS Style**

Han, Y.; Zhang, J.
Recognition Algorithm of Transient Overvoltage Characteristic Based on Symmetrical Components Estimation. *Symmetry* **2020**, *12*, 114.
https://doi.org/10.3390/sym12010114

**AMA Style**

Han Y, Zhang J.
Recognition Algorithm of Transient Overvoltage Characteristic Based on Symmetrical Components Estimation. *Symmetry*. 2020; 12(1):114.
https://doi.org/10.3390/sym12010114

**Chicago/Turabian Style**

Han, Yanzan, and Jimeng Zhang.
2020. "Recognition Algorithm of Transient Overvoltage Characteristic Based on Symmetrical Components Estimation" *Symmetry* 12, no. 1: 114.
https://doi.org/10.3390/sym12010114