Abstract
The synchronizing torque of a power system may be weakened by increasing installation of static power converters accompanied by renewable energy resources because they used to trade their favorable active power by synchronizing their output voltage with the one at the point of common coupling. In the circumstances, a concept of Virtual Synchronous Machine (VSM) is proposed, where the self-commutated power converters are emulating synchronous generators. This paper describes a converter control to contribute to enhancing the synchronizing torque. The proposed control is similar to the VSM but it simply realizes active power trades among power generation units including converter-based generators by modulating phase angles of their output voltages. Therefore, it can provide an effective support to regulate the system frequency where the total rated power of the converter-based generators increases as much as the one of conventional rotating generators like a microgrid. This paper especially focuses on its robustness where the number of converter-based generators is increased or they are dispersed in the power network. The effectiveness is verified by simulation study based on instantaneous values.
Highlights
A conventional power system has been supplied by a lot of synchronous generators
The synchronizing torque of a power system may be weakened by increasing installation of static power converters accompanied by renewable energy resources with a growing demand of high penetration of renewable energies
There is a proposal of a Virtual Synchronous Machine (VSM) [1]-[3], where the converter behaves like a traditional synchronous machine with the inertia
Summary
A conventional power system has been supplied by a lot of synchronous generators. They have kept a good power balance among them by their synchronizing torques. Unlike the VSM, authors proposed a phase-shifting method of the output voltage phasor [6], which only emulates an active power exchange between the power converter and the power system to enhance the synchronizing torque of the power system. It can provide an effective support to regulate the system frequency where the total rated power of the converter-based generators increases as much as one of the conventional rotating generators like a microgrid. It can be hardly estimated where the available converters are installed and how many inverters join the frequency regulation. It is confirmed that multiple static power converters employing the proposed controller can properly cooperate with each other when they are distributed or they use other control parameters
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