Experimental study on power system stabilization by pseudo-synchronizing power inverter with multiple synchronous machines

Sekizaki, Shinya; Sasaki, Yuya; Yorino, Naoto; Nakamura, Yuki; Zoka, Yoshifumi; Nishizaki, Ichiro

doi:10.1109/isgt-asia.2016.7796390

Cited by 7 publications

(9 citation statements)

References 17 publications

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“…In this paper, we use the following model of a linearizing synchronous machine (Equations 1 to ) that comprises a synchronous generator X d ' model, a governor, and an automatic voltage regulator (AVR). This model was also used in our prior studies …”

Section: Proposal Of Separated Design Concept Of Core and Shellmentioning

confidence: 99%

“…One technique that has been shown to be effective in improving stability involves equipping power converters with pseudo inertia. Such converters have the same functions as synchronous generators . The method, proposed by Zhang et al, in which the output of the power converter is synchronized with the grid is called “power synchronization” and is based on the synchronization mechanism unique to synchronous generators.…”

Section: Introductionmentioning

confidence: 99%

“…We have proposed methods for providing three‐phase and single‐phase inverters with pseudo‐synchronizing capability . In particular, we have recently conducted a variety of studies and made proposals on additional functions related to frequency control, voltage control, and current control at failure . In this paper, we refer to these as a synchronous inverter (SI) and incorporate all of our previous research.…”

Section: Introductionmentioning

confidence: 99%

“…First, in conventional SI techniques, multifeedback loops (MFBs) were the standard for suppressing voltage and current. However, MFBs have inherent dynamic characteristics that are dependent on the transfer function and that become an obstacle when providing desired dynamic characteristics (e.g., those of a synchronous generator) to the inverter, diverge from the intended control characteristics, inhibit the dynamic characteristics of the inverter designed when grid conditions change, and the like. For these and other reasons, MFBs have not always satisfied the demands for grid stability.…”

Section: Introductionmentioning

confidence: 99%

“…Next, we organize and reconstruct the results, for the SSI on the basis of the aforementioned design concept, and propose a novel design method. In most of the prior research, the focus has been placed on three‐phase power converters but, for consumers, single‐phase converters allow for more flexibility in operation . Our proposed method achieves overcurrent protection at failure even in a single‐phase circuit, can faithfully implement the dynamic characteristics designed for stabilizing a three‐phase power grid and, in an emergency situation, is capable of operating alone, specifically, constructing a local, single‐phase microgrid and operating independently.…”

Section: Introductionmentioning

confidence: 99%

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Proposal of a single‐phase synchronous inverter with noninterference performance for power system stability enhancement and emergent microgrid operation

Sekizaki

Yorino

Sasaki

et al. 2019

Electrical Engineering Japan

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A novel design of a single-phase synchronous inverter (SSI) having noninterference core dynamic performance is proposed, referred to as noninterference core SSI (NIC-SSI) in this paper. The proposed inverter consists of "core" and "shell." This novel design is advantageous for a flexible setting of the core controller to enhance power system stability, which is supported by the shell function for keeping robust synchronizing operation of inverters including microgrid operation. The novel points in this paper are summarized as: (a) the proposed controller enables SSIs to implement directly a desired dynamic characteristic such as a synchronous machine; (b) it can connect any single-phase systems as well as three-phase systems; (c) an islanded single-phase microgrid without rotating machines can be stabilized by multiple SSIs. The proposed controller makes it possible to enhance system stability against increasing uncontrollable renewable energy sources (RESs) and static power conversion devices. The developed SSI realizes flexible use in the demand side operations under normal/faulted grid conditions. Hardware-in-the-loop (HIL) testbed including the proposed digital controller and the real-time simulator validates the effectiveness of the proposed controller in the experimental conditions. K E Y W O R D Spower system stabilization, single-phase microgrid, single-phase synchronous inverter, synchronizing power Recent years have shown a steep rise in the amount of renewable energy sources (RES) being introduced. This has led to difficulties in maintaining the conventional reliability of the power grid 1-3 and other problems. As such, studies are underway to address these problems. In past papers, we demonstrated the concept of robust reliability against worst cases in uncertain environments, and proposed a method for analyz-ing and controlling the power system. 4-6 Meanwhile, there are concerns about power system stability, which is a matter that is related to the reliability problem. The fact that RES gridconnected inverter power sources are increasing means that the number of conventional power sources (i.e., synchronous generators) are decreasing, and this reduction of the inertia of the power grid is a cause of instability. Typically, the synchronizing capability of synchronous generators is vital to the stable operation of the power grid. One technique that has been

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Section: Proposal Of Separated Design Concept Of Core and Shellmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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