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.
Highlights
With the deficit of fossil fuels and environmental concerns, renewable power has been widely researched and utilized in recent decades [1,2,3]
This paper focuses on parameter tuning for virtual synchronous generator (VSG)-power electronic interfaces (PEIs) by performance indices
In order to enhance the VSG algorithm to sustain the flexibility level of power systems containing a mixed generation at all times, in this paper, a quantitative approach of performance tuning for VSG-PEIs participating in multiple temporal stages of frequency control is presented
Summary
With the deficit of fossil fuels and environmental concerns, renewable power has been widely researched and utilized in recent decades [1,2,3]. In [12], a step-by-step parameter design for virtual synchronous generators is conducted based on small-signal modeling, which focuses on independent decoupling and tuning of active and reactive power loops of a single grid-connected inverter This approach is oriented for coping with unbalanced grid voltages, but not for quantitative performance indices. In order to enhance the VSG algorithm to sustain the flexibility level of power systems containing a mixed generation at all times, in this paper, a quantitative approach of performance tuning for VSG-PEIs participating in multiple temporal stages of frequency control is presented. Through analyzing the composite influence on system performances by different parameters, Section 5 proposes a parameter tuning algorithm by consideration of the time sequence of performance indices in the multiple frequency control stages.
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