Abstract
Renewable generation brings both new energies and significant challenges to the evolving power system. To cope with the loss of inertia caused by inertialess power electronic interfaces (PEIs), the concept of the virtual synchronous generator (VSG) has been proposed. The PEIs under VSG control could mimic the external properties of the traditional synchronous generators. Therefore, the frequency stability of the entire system could be sustained against disturbances mainly caused by demand changes. Moreover, as the parameters in the emulation control processes are adjustable rather than fixed, the flexibility could be enhanced by proper tuning. This paper presents a parameter tuning method adaptive to the load deviations. First, the concept and implementation of the VSG algorithm performing an inertia response (IR) and primary frequency responses (PFR) are introduced. Then, the simplification of the transfer function of the dynamic system of the stand-alone VSG-PEI is completed according to the distributed poles and zeros. As a result, the performance indices during the IR and PFR stages are deduced by the inverse Laplace transformation. Then, the composite influences on the performances by different parameters (including the inertia constant, the speed droop, and the load deviations) are analyzed. Based on the composite influences and the time sequences, an adaptive parameter tuning method is presented. The feasibility of the proposed method is verified by simulation.
Highlights
Renewable generation (RG), such as the solar PV and wind power, has been widely utilized in the last decades due to the depleted fossil fuels and the environment concerns [1,2,3]
With the increasing penetration of renewable generation and the consequent displacement of traditional synchronous generators (SGs), the current power system has been undergoing an intrinsic transition toward converter-dominated grids
An adaptive method of parameter tuning for virtual synchronous generator (VSG)-based Voltage-sourced converters (VSCs) providing both inertia response (IR) and primary frequency responses (PFR) for counteracting the load disturbances is presented based on quantitative performance analysis
Summary
Renewable generation (RG), such as the solar PV (photovoltaic) and wind power, has been widely utilized in the last decades due to the depleted fossil fuels and the environment concerns [1,2,3]. An adaptive method of parameter tuning for VSG-based VSCs providing both inertia response (IR) and PFR for counteracting the load disturbances is presented based on quantitative performance analysis. Performance indices are proposed, and the frequency responses influenced by different parameters are analyzed. (2) It is noted that the performance indices are influenced by composite parameters, but the hierarchical stages of IR and PFR operate in chronological order. The proposed parameter approach could be used to enhance the flexibility and response time as well as maintain the required frequency stability. The rest of the paper is organized as follows: Section 2 presents the VSG algorithm to perform frequency response. Through analyzing the composite influence on system performances by different parameters, Section 4 proposes a parameter tuning algorithm by consideration of the time sequence of performance indices in the multiple frequency control stages.
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