Abstract
Due to the significance of extracting the grid voltage information, the grid synchronization system plays an important role in the control of grid-connected power converters, and various grid voltage synchronization schemes have been proposed. This chapter adopts the complex-vector-filter method (CVFM) to analyze the grid synchronization systems. With this method, the pairs of scalar signals, for example, the α- and β-axis components in the stationary α-β frame, are combined into one complex vector. As a consequence, the grid synchronization systems can be described with the complex transfer functions, which is very convenient to evaluate the steady-state performance, for example, the fundamental and harmonic sequences decoupling/cancellation, and dynamic performance of these systems. Besides, the CVFM also provides a more generalized perspective to understand and develop the grid synchronization systems. Therefore, some of the representative systems are reanalyzed with the CVFM in this chapter. A generalized second-order complex-vector filter and a third-order complex-vector filter are proposed with the CVFM to achieve better dynamic performance or higher harmonic attenuation. Moreover, a brief comparison of the complex-vector filters analyzed in this chapter is presented. The effectiveness of the CVFM and the proposed two complex-vector filters are verified by the simulation and experimental results.
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Ruan, X., Wang, X., Pan, D., Yang, D., Li, W., Bao, C. (2018). Prefilter-Based Synchronous Reference Frame Phase-Locked Loop Techniques. In: Control Techniques for LCL-Type Grid-Connected Inverters . CPSS Power Electronics Series. Springer, Singapore. https://doi.org/10.1007/978-981-10-4277-5_12
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DOI: https://doi.org/10.1007/978-981-10-4277-5_12
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