# New Hybrid Static VAR Compensator with Series Active Filter

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## Abstract

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## 1. Introduction

## 2. Previously Proposed Topologies of the Hybrid Static VAR Compensator

## 3. Newly Proposed Hybrid Static VAR Compensator

## 4. Simulation Results

## 5. Comparisons between the Newly Proposed Topology and Previously Proposed Topologies

## 6. Conclusions

## Author Contributions

## Conflicts of Interest

## References

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**Figure 3.**Power circuit diagram of the previously proposed hybrid static VAR compensator (SVC) with a static synchronous compensator (STATCOM) [14].

**Figure 4.**Circuit diagram of the proposed hybrid static VAR compensator (SVC) with a series active filter (AF).

**Figure 5.**Per-phase equivalent circuits for Figure 4 with the control gain ${K}_{\mathrm{C}}$ $\Omega $. (

**a**) Per-phase equivalent circuit. (

**b**) Per-phase equivalent circuit for current-source harmonic-producing load. (

**c**) Equivalent circuit for ${\dot{I}}_{\mathrm{LT}h}$. (

**d**) Equivalent circuit for ${\dot{V}}_{\mathrm{S}h}$.

**Figure 7.**Simulation waveforms for Figure 4 before/after the series active filter (AF) with ${K}_{\mathrm{C}}$ of 10 $\Omega $ was started.

**Figure 8.**Simulation waveforms for Figure 4 before/after the series active filter (AF) with ${K}_{\mathrm{C}}$ of 20 $\Omega $ was started.

**Figure 9.**Simulation waveforms for Figure 4 before/after the series active filter (AF) with ${K}_{\mathrm{C}}$ of 30 $\Omega $ was started.

**Figure 11.**Simulation waveforms for Figure 4 with the three-phase load variation from 0.6 to 1 pu, when the control gain ${K}_{\mathrm{C}}$ was 30 $\Omega $.

**Table 1.**Previously proposed hybrid static VAR compensator (SVC) topologies and functions of added active filter (AF).

Topology | Functions of Added AF | Required Rating of Added AF for Three-Phase Load Rating | |
---|---|---|---|

Figure 1 | Thyristor-controlled reactor (TCR) and passive LC filter with series AF | Improvement of harmonic voltage compensation characteristics of passive LC filter | 1.4% |

Figure 2 | TCR and phase-leading capacitor (PLC) with series AF | Harmonic current compensation | 4.0% |

Figure 3 | TCR and parallel-connected static synchronous compensator (STATCOM) | Fundamental reactive-power control and harmonic current compensation | 80% |

**Table 2.**Circuit Constants for Figure 4.

Item | Symbol | Value |
---|---|---|

Source inductor | ${L}_{\mathrm{S}}$ | 1.64 mH |

Filter inductor | ${L}_{\mathrm{f}}$ | 0.066 mH |

Filter capacitor | ${C}_{\mathrm{f}}$ | 96 μF |

Inductors of SVC | ${L}_{\mathrm{ab}}$, ${L}_{\mathrm{bc}}$, ${L}_{\mathrm{ca}}$ | 108 mH |

PLCs | ${C}_{\mathrm{ab}}$, ${C}_{\mathrm{bc}}$, ${C}_{\mathrm{ca}}$ | 114 μF |

DC capacitor | ${C}_{\mathrm{DC}}$ | 4700 μF |

DC-capacitor voltage | ${V}_{\mathrm{DC}}^{\ast}$ | 10 kVdc |

Switching frequency | ${f}_{\mathrm{S}}$ | 12 kHz |

Cut-off frequency of second-order LPF | ${f}_{\mathrm{C}}$ | 179 Hz |

Damping factor of second-order LPF | $\xi $ | 0.7 |

Proportional gain for constant DC-capacitor | ${K}_{\mathrm{P}}$ | 0.6 |

voltage controller | ||

Integral gain for constant DC-capacitor | ${T}_{\mathrm{I}}$ | 0.01 |

voltage controller | ||

Proportional gain for PLL | ${K}_{\mathrm{P}}$ | 5 |

Integral gain for PLL | ${T}_{\mathrm{I}}$ | 0.01 |

Control gain for series AF | ${K}_{\mathrm{C}}$ | 10, 20, 30 $\Omega $ |

**Table 3.**Data for the matching transformers (MTs) used in Figure 4.

Primary-side voltage | 1.19 kVrms |

Primary-side rated current | 1.42 kArms |

Turn ratio | 1:2 |

No load current | 56.8 Arms (4.0%) |

Iron loss | 17 kW |

Copper loss | 34 kW |

Impedance voltage | 35.6 Vrms (3.0%) |

© 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

## Share and Cite

**MDPI and ACS Style**

Tokiwa, A.; Yamada, H.; Tanaka, T.; Watanabe, M.; Shirai, M.; Teranishi, Y.
New Hybrid Static VAR Compensator with Series Active Filter. *Energies* **2017**, *10*, 1617.
https://doi.org/10.3390/en10101617

**AMA Style**

Tokiwa A, Yamada H, Tanaka T, Watanabe M, Shirai M, Teranishi Y.
New Hybrid Static VAR Compensator with Series Active Filter. *Energies*. 2017; 10(10):1617.
https://doi.org/10.3390/en10101617

**Chicago/Turabian Style**

Tokiwa, Ayumu, Hiroaki Yamada, Toshihiko Tanaka, Makoto Watanabe, Masanao Shirai, and Yuji Teranishi.
2017. "New Hybrid Static VAR Compensator with Series Active Filter" *Energies* 10, no. 10: 1617.
https://doi.org/10.3390/en10101617