Performance Tuning for Power Electronic Interfaces Under VSG Control

Abstract

Renewable generation, such as solar PV and wind power, is commonly integrated into the power grid through inertialess power electronic interfaces (PEIs). Due to the increasing penetration of renewable generation, the frequency stability of the current power system deteriorates. In order to sustain the desired level of the overall inertia, the virtual synchronous generator (VSG) algorithm has been proposed. The concept of VSG is to enable the PEIs to emulate the external properties of traditional synchronous generators (SGs), such as inertia and primary frequency responses. By exploitation of the well-established knowledge system of conventional SG-based power grids, the VSG can also be implemented with the capabilities of primary, secondary, and tertiary frequency control in multiple temporal stages. This paper focuses on parameter tuning for VSG-PEIs by performance indices. The emulation strategies are completed with the capability of secondary and tertiary frequency regulation. The transfer functions of the dynamic systems of PEIs are simplified and referred to the control theory. The composite influences of different parameters on performance indices are analyzed. The methods of the parameter tuning are proposed according to the temporal sequences of the control stages. By typical performance standards, the proposed method is verified through simulation.

Automatic Generation Control with Virtual Synchronous Renewables

“…It is noted that the fundamental discrepancy between RESs and SGs is the capability of providing frequency responses and the dispatchability in the domain of frequency stability. Therefore, the concept and control strategies of virtual synchronous generator (VSG) are prompted to incorporate asynchronous RESs into the frame of active power and frequency control [8]- [13]. For practical energy sources, the emulation of IR and PFR can be realized by the "hidden inertia" for wind turbines, storage, and deloading strategy [14].…”

Simultaneous Optimization of Virtual Synchronous Generators (VSG) Parameters in Islanded Microgrids Supplying Induction Motors

“…Two instantaneous power components (p, q) are defined as functions of output voltages (v od , v oq ) and currents (i od , i oq ) of VSG units in ( 6) and (7). Two low-pass filters with the cut-off frequency of ω c are applied in series with power calculator [18].…”

“…The enhanced power decoupling mechanism in [6] applies virtual steady-state synchronous impedance and current compensation in the VSG controller to improve the dynamic performance and the stability of the system. The VSG parameters effects on performance indices have been analyzed in [7] and an algorithm has been proposed to tune these parameters to achieve the preferred performance indices.…”

Controle inercial e de oscilações para sistemas com alta penetração de geração eólica

“…Embora a geração eólica apresente ganhos energéticos complementares, o mesmo não se verifica para a geração de potência em tempo real. Além da variabilidade do vento e da difícil previsibilidade, sistemas com alta penetração de geração eólica possuem baixa inércia, uma vez que, geralmente, as turbinas eólicas são conectadas à rede através de conversores estáticos de potência, que desacoplam a velocidade de rotação dos geradores eólicos da frequência da rede (ZHANG et al, 2020). Ou seja, os geradores eólicos não são sensíveis às variações de carga do sistema e não fornecem resposta inercial.…”