Influence of Photovoltaic Power Plants Based on VSG Technology on Low Frequency Oscillation of Multi-Machine Power Systems

Zhou, Xinyi; Cheng, Shu Kei; Wu, Xun; Rao, Xinliang

doi:10.1109/tpwrd.2022.3177042

Cited by 21 publications

(8 citation statements)

References 19 publications

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“…In the second scenario along with the previous fault on line [21][22], one more fault on line 26-29 at 1 sec and has been applied and cleared by isolating that line at 1.1 sec. Te response of the system in terms of generator frequency is shown in Figure 21 in three parts by grouping the coherent oscillations.…”

Section: Scenario IImentioning

confidence: 99%

“…Te latest literature [18][19][20][21][22] have carried out research studies regarding the design of wide-area power system stabilizer (PSS) using PMU for damping interarea oscillations to improve the stability of the system. PSS efectively increases damping of low-frequency oscillations by shifting unstable mode to the left side of the complex plane.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Oscillations during Out-of-Step Condition in Power Systems

Alnassar

Nagarajan

2023

International Transactions on Electrical Energy Systems

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Power systems interconnected by weak tie lines can be subject to low-frequency oscillations because of disturbances which excites the low-frequency modes of the system; furthermore, these oscillations can be stable or unstable. The latter, if not treated, can cause severe oscillations that divide the network into smaller groups which oscillate against each other, leading to out-of-step (OOS) condition in the network. The detection of OOS condition is a challenge for power system operators in real time as it is difficult with conventional measuring instruments, to identify the instant at which the bus voltage angle between two areas connected by tie line falls out of synchronism. Conventionally, the detection of OOS condition has been carried out with impedance-based relays along with power swing blocking. With the advent of synchrophasor-based measurement units, it is now possible to measure the bus voltage angle in real time leading to direct detection of OOS condition in power system and intentional islanding. In this article, a systematic analytical study and EMT time-domain simulation study have been performed to simulate OOS condition in the power systems, and its detection is based on the voltage angle difference with wide-area measurement systems (WAMSs). The article has been carried out on a single machine infinite bus (SMIB) to monitor generator OOS, Kundur’s two-area system to detect interarea OOS, and the IEEE39 bus system to identify OOS condition and with a new algorithm. Time-domain simulation studies carried out with OPAL-RT real-time simulator in HYPERSIM environment corroborates with analytical results.

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Section: Scenario IImentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Oscillations during Out-of-Step Condition in Power Systems

Alnassar

Nagarajan

2023

International Transactions on Electrical Energy Systems

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“…] T (11) where ⊗represents Hadamard product, that is, the corresponding elements in the matrix are multiplied. G(s) indicates the transfer function matrix of MIMO system.…”

Section: Rga Principlementioning

confidence: 99%

“…These power electronic converters can establish the AC voltage and provide inertial support for frequency regulation of power grid [8][9]. VSG is a typical control technology of grid-forming inverter [10,11], which provides inertia and damping support for the system by simulating the rotor motion equation of SG. In addition, it has the advantage of being naturally friendly to the power grid and is one of the ideas to solve the above problems, which has become the research focus at home and abroad in recent years [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…There are usually two modelling methods to analyze the interaction between power-frequency control loops of multi-inverter grid-connected systems. One is to construct the state-space model of the system, which has the advantage of completely obtaining the dynamic performance of the system, but the complexity of the model will increase with the control strategy and power grid structure [11,[22][23][24]. The small-signal model of multi-VSG system is established in [22], the influence factors of low-frequency eigenvalues are analyzed, and the variation laws of various factors on inter-VSG frequencies are further studied.…”

Section: Introductionmentioning

confidence: 99%

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Coupling analysis on power‐frequency control loops for virtual synchronous generator based on relative gain array and Prony method

Jia

Yan

Qin

2023

IET Power Electronics

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With the improvement of the penetration of power electronic equipment, a challenging scenario is arising in power‐frequency control system design of virtual synchronous generator (VSG). This affects the stability and control performance of the multi‐VSG grid‐connected system due to the undesirable dynamic coupling of the power‐frequency control loops. From this perspective, this paper proposes a systematic procedure for accurately evaluating the coupling of power‐frequency control loop, which is based on the relative gain array (RGA) and Prony analysis method. Firstly, the output admittance model of multi‐VSG grid‐connected system is established, and the transfer function matrices of output power and angular frequency are derived, respectively. Then, the variation law of coupling between control loops of VSG with different parameters is investigated by two methods: One is numerical analysis, and the other is RGA method which can determine the frequency band of coupling. Besides, the interaction between different VSG control strategies is compared and analyzed based on RGA. Subsequently, Prony analysis method is proposed to verify the results of RGA analysis. Finally, simulation and experimental results in a two‐machine grid‐connected system are presented to support the theoretical analysis and demonstrate the feasibility of the proposed method.

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Research on Hybrid Energy Storage Control Strategy of Photovoltaic Microgrid Based on Virtual Synchronous Generator

Zhang,

Pan

et al. 2024

Lecture Notes in Electrical Engineering

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Influence of Photovoltaic Power Plants Based on VSG Technology on Low Frequency Oscillation of Multi-Machine Power Systems

Cited by 21 publications

References 19 publications

Analysis of Oscillations during Out-of-Step Condition in Power Systems

Analysis of Oscillations during Out-of-Step Condition in Power Systems

Coupling analysis on power‐frequency control loops for virtual synchronous generator based on relative gain array and Prony method

Research on Hybrid Energy Storage Control Strategy of Photovoltaic Microgrid Based on Virtual Synchronous Generator

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