# Low Voltage Ride Through Controller for a Multi-Machine Power System Using a Unified Interphase Power Controller

^{1}

^{2}

^{3}

^{4}

^{*}

## Abstract

**:**

## 1. Introduction

## 2. The UIPC Operation

_{s}) by injecting the series voltage with the specified amplitude and the angle in each branch. These voltages are named V

_{se1}and V

_{se2}, according to their converters. Moreover, V

_{r}is the connection point voltage. From Figure 1, the value of the magnitude and the voltage of the branches of the series converter is

_{L}and X

_{C}values of the series branches at the main system frequency (50 Hz) must be equal to each other. Figure 2 displays the circuit of the UIPC, including the equivalent series circuit and parallel converters as well as transformers.

_{se,}and parallel converter losses are related to R

_{sh,}as shown in Figure 2. Given these losses, the power exchange equation between series and parallel converters is

_{se}

_{1}and P

_{se}

_{2}are active powers of series converters and P

_{sh}is the parallel converter’s power, which can be defined as

_{se}and voltage source converters are modelled by R

_{sh}.

## 3. Proposed Controller

_{sh}) and the angle of fire (θ

_{sh}) at the PWM switch shown in Figure 3.

_{_ref}) is compared with the actual value and compensated using a PI controller to provide the q-component of the reference current for the switching. The gains of a PI controller can be obtained by the trial and error method [20,25,26].

## 4. Results

^{th}bus. The test system, including the conventional generators in two symmetrical zones and the solar system with UIPC, is shown in Figure 4. For better comparison, the performance of the suggested UIPC is compared with the UPFC. As seen, the UIPC is connected to the main grid using a transformer. To confirm the effectiveness of the offered technique, the performance of the PV-based UIPC is compared with the PV-based UPFC.

## 5. Conclusions

## Author Contributions

## Funding

## Conflicts of Interest

## References

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**Figure 3.**Block diagram of the proposed control system: (

**a**) series converter control and (

**b**) parallel converter control.

**Figure 5.**The output power of Generator 1 (left side G1) in three different modes, including without compensator (P G1), with unified power flow controller (UPFC) (P G1upfc), and with UIPC (PG1uipc).

**Figure 6.**The output power of Generator 2 (left side G2) in three different modes: without any compensator, with UPFC, and with UIPC.

**Figure 7.**Speed of generators 1 and 2 (left side G1 and G2) in three states without a compensator, using UIPC and UPFC.

Parameters | Values |
---|---|

Rated SEC1 | 50 MVA |

Rated SEC2 | 50 MVA |

Rated SHC | 50 MVA |

X_{L} = X_{C} | 78.89 Ω |

L | 280 mH |

C | 38.18 uF |

DC-link voltage (V_{DC}) | 5 kV |

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**MDPI and ACS Style**

Majlesi, A.; Miveh, M.R.; Ghadimi, A.A.; Kalam, A.
Low Voltage Ride Through Controller for a Multi-Machine Power System Using a Unified Interphase Power Controller. *Electronics* **2021**, *10*, 585.
https://doi.org/10.3390/electronics10050585

**AMA Style**

Majlesi A, Miveh MR, Ghadimi AA, Kalam A.
Low Voltage Ride Through Controller for a Multi-Machine Power System Using a Unified Interphase Power Controller. *Electronics*. 2021; 10(5):585.
https://doi.org/10.3390/electronics10050585

**Chicago/Turabian Style**

Majlesi, Atoosa, Mohammad Reza Miveh, Ali Asghar Ghadimi, and Akhtar Kalam.
2021. "Low Voltage Ride Through Controller for a Multi-Machine Power System Using a Unified Interphase Power Controller" *Electronics* 10, no. 5: 585.
https://doi.org/10.3390/electronics10050585