Virtual Damping Control Design of Three-Phase Grid-Tied PV Inverters for Passivity Enhancement
| Autor: | Chirag Shah, Jakob Teichrib, Tianxiao Chen, Rik W. De Doncker, Zhiqing Yang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Computer science
020208 electrical & electronic engineering Passivity Resonance 02 engineering and technology Filter (signal processing) Dissipation Equivalent impedance transforms Transfer function Phase-locked loop Three-phase Classical control theory Control theory Nyquist stability criterion Frequency domain 0202 electrical engineering electronic engineering information engineering Inverter Electrical and Electronic Engineering Electrical impedance |
| Zdroj: | IEEE Transactions on Power Electronics. 36:6251-6264 |
| ISSN: | 1941-0107 0885-8993 |
| Popis: | The interconnection stability of a grid-tied inverter system can be investigated not only based on classical control theory, e.g., Nyquist criterion, but also from the energy dissipation point of view. If a critical resonance occurs within the regions, where the system equivalent impedance behaves passively, i.e., has only nonnegative real parts, the system stability can be guaranteed. Thus, it is preferred to design systems with passive regions over a wide-frequency range. This article investigates passivity properties influenced by different control loops and operating points in the $dq$ frame, which facilitates the stability assessment in the frequency domain. Based on this, a virtual damping control method is proposed to improve the stability by enhancing the system passivity. By implementing a damping transfer function in the $d$ - and $q$ -axis individually, nonpassive regions can be accordingly reduced over a specific frequency range. Asymmetrical designs can be considered in the $d$ - and $q$ -axis according to corresponding passivity properties, which is impossible to be realized through symmetric physical filter components. The design procedure is elaborated based on a 2 MW inverter system, which is based on a combined graphical and analytical approach. Verifications are conducted based on a 1 kW prototype including both simulations and experimental results. The method applies to all types of grid-tied inverters with multiple control loops. This article is accompanied by a video demonstrating the validations. |
| Databáze: | OpenAIRE |
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