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| Content Provider | IET Digital Library |
|---|---|
| Author | Guo, Li Liu, Rui Li, Xialin Zhang, Yun |
| Abstract | Two-stage power conversion system (PCS) for energy storage systems has been considered in islanded operation mode. A three-level T-type three-leg three-phase four-wire topology (3LT23L3P4W) is employed as AC/DC part and a three-level buck/boost converter is used as DC/DC interface. This study is mainly focused on balancing the neutral-point potential (NPP) of the PCS with asymmetrical load connection. An NPP low-frequency ripple model of 3LT23L3P4 inverter is proposed considering various load conditions firstly, which includes detailed expression of low-frequency ripple components at fundamental frequency and fundamental frequency multipliers. Then, a novel NPP balancing method based on front-end three-level buck/boost converter under proportional resonant control is presented, in which the resonance points are set at fundamental frequency and triple fundamental frequency to suppress the dominant components of NPP ripple. Furthermore, a small-signal model of three-level buck/boost NPP control system is established and stability analysis is carried out. Simulation and experimental results have been provided to verify the accuracy of the NPP low-frequency ripple model and the effectiveness of the NPP balancing method. |
| Starting Page | 2618 |
| Ending Page | 2627 |
| Page Count | 10 |
| ISSN | 17554535 |
| Volume Number | 13 |
| e-ISSN | 17554543 |
| Issue Number | Issue 12, Sep (2020) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-pel/13/12 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2019.1211 |
| Journal | IET Power Electronics |
| Publisher Date | 2020-06-02 |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | Asymmetrical Load Connection Control of Electric Power System Current Control DC-DC Power Converter Distributed Power Generation Electric Current Control Energy Storage System Four-wire Power Conversion System Four-wire Topology Fundamental Frequency Multipliers Invertors Islanded Operation Mode Load Condition Low-frequency Ripple Component Neutral Point Potential Balancing Method Neutral-point Potential Novel NPP Balancing Method NPP Low-frequency Ripple Model NPP Ripple Other Power Apparatus And Electric Machine PCS Power Capacitor Power Converter Power Electronics Power Supplies to Apparatus Power Supply Resonance Point Supervisory Circuit Switching Converter Three-level Power Converter Three-level T-type Three-leg Triple Fundamental Frequency Two-stage Power Conversion System Voltage Control |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electrical and Electronic Engineering |
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