Jiali Yu , Xiaoxin Hou , Chaoying Xia , Guodong You , Jixiang Li
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Control method for AC–AC MMC-based pumped storage system
Variable speed pumped storage plants play an important role in mitigating power fluctuations caused by renewable energy sources. Among various high-power converter topologies, modular multilevel converter (MMC) has been considered as one of the most promising solutions for pumped storage systems. However, the conventional MMC configurations suffer from serious capacitor voltage fluctuations and common-mode voltage problems. These problems occur in the traditional AC-DC-AC MMC at low motor frequency and persist in the direct AC-AC MMC at high motor frequency, restricting the application of MMC in pumped storage systems. To address these limitations, a direct AC-AC MMC topology is given in this paper. To achieve stable control of the closed-loop system, a nonlinear feedback controller with simple control structure is designed based on Lyapunov theory. Furthermore, normalized parameter design methods are introduced to effectively suppress capacitor voltage fluctuations and common-mode voltage under both ideal and faulty grid conditions. The simulation and experiment results are conducted to verify the effectiveness of the proposed topology and control method.
期刊介绍:
Control Engineering Practice strives to meet the needs of industrial practitioners and industrially related academics and researchers. It publishes papers which illustrate the direct application of control theory and its supporting tools in all possible areas of automation. As a result, the journal only contains papers which can be considered to have made significant contributions to the application of advanced control techniques. It is normally expected that practical results should be included, but where simulation only studies are available, it is necessary to demonstrate that the simulation model is representative of a genuine application. Strictly theoretical papers will find a more appropriate home in Control Engineering Practice''s sister publication, Automatica. It is also expected that papers are innovative with respect to the state of the art and are sufficiently detailed for a reader to be able to duplicate the main results of the paper (supplementary material, including datasets, tables, code and any relevant interactive material can be made available and downloaded from the website). The benefits of the presented methods must be made very clear and the new techniques must be compared and contrasted with results obtained using existing methods. Moreover, a thorough analysis of failures that may happen in the design process and implementation can also be part of the paper.
The scope of Control Engineering Practice matches the activities of IFAC.
Papers demonstrating the contribution of automation and control in improving the performance, quality, productivity, sustainability, resource and energy efficiency, and the manageability of systems and processes for the benefit of mankind and are relevant to industrial practitioners are most welcome.