Harmonic Current and Inrush Fault Current Coordinated Suppression Method for VSG Under Non-ideal Grid Condition

Zhou, Leming; Liu, Siyi; Chen, Yandong; Yi, Weilang; Wang, Shuke; Zhou, Xiaoping; Wu, Wenhua; Zhou, Jie; Xiao, Chan; Liu, Aoyang

doi:10.1109/tpel.2020.3000522

Cited by 40 publications

(29 citation statements)

References 31 publications

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“…In this situation, in order to reduce the grid harmonic current, the output impedance must be reduced, while this reduction increases the transient inrush fault current and its steady-state operation in the grid symmetrical fault condition. In [104], to solve this problem, two virtual impedances are added to the circuit. One impedance is added in parallel with the output impedance, which can contribute to the suppression of the grid harmonic current by reducing the output impedance.…”

Section: Hybrid Control Methods (Hcm)mentioning

confidence: 99%

State of the Art of the Techniques for Grid Forming Inverters to Solve the Challenges of Renewable Rich Power Grids

et al. 2022

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To mitigate the fast-growing demand of electrical energy, the use of renewable energy resources, e.g., solar and wind, can offer an environmentally friendly and sustainable solution. Due to their intermittent nature, the grid connected operation of renewable energy resources provides a better performance compared to the standalone operation. However, the massive penetration of power electronic inverter/converter-interfaced renewable resources in power systems introduces new issues, such as voltage and frequency instabilities, because of their inherent low inertia properties. As a consequence, these issues may lead to serious problems, such as system blackouts. Therefore, there is an immediate demand to solve these new issues and ensure the normal performance of the power system with the large penetration of renewable energy resources. To achieve this, grid connected inverters/converters are designed to address these problems and behave as synchronous generators, which is possible with grid forming (GFM) inverters/converters concepts. This paper reviews the recent advancement of GFM converters for solving emerging issues related to the renewable rich power grids. It also provides a comprehensive review on frequency deviations and power system stability issues in low-inertia systems and recent advancements in control methods for harmonic mitigation. It is expected that this paper will help the research community to enhance the technology further to solve the challenges in renewable rich power grids.

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Section: Hybrid Control Methods (Hcm)mentioning

confidence: 99%

State of the Art of the Techniques for Grid Forming Inverters to Solve the Challenges of Renewable Rich Power Grids

et al. 2022

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“…The expression of the transfer function G (s) can be obtained in (2). Further, the expression of the transfer function G1(s) between the change of DC bus voltage and that of output power can be obtained in (3). Finally, the transfer function during the steady state between DC bus voltage variation and output power variation can be obtained in (4).…”

Section: Figure 5 Simplified Small Signal Modelmentioning

confidence: 99%

“…In the DC microgrid, each unit is connected to the DC bus through a power electronic converter lacking virtual inertia and damping. When largescale power fluctuation occurs, DC bus voltage will fluctuate violently, which endangers the safety and stability of the DC microgrid seriously [3]. Moreover, the distributed units connected to the DC microgrid have random power fluctuation.…”

Section: Introductionmentioning

confidence: 99%

Parameter-Adaptation-Based Virtual DC Motor Control Method for Energy Storage Converter

2021

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To suppress the influence of power fluctuation in the DC microgrid system, virtual DC motor (VDM) control is applied to the energy storage converter for improving the stability of the power system. Due to the fixed parameters adopted in the traditional VDM control strategy, the dynamic response of the system cannot be taken into account. Based on the traditional VDM control strategy，a small signal model is established to analyze the influence of the moment of inertia J and the damping coefficient D on the control performance. Moreover, the effects of J and D on the dynamic response of DC bus voltage under power fluctuation are thoroughly analyzed. Consequently, a novel parameter-adaptation-based VDM control strategy is proposed by realizing the adaptive adjustment of J and D. Furthermore, the comparative simulation of three kinds of operating conditions are carried out, and the adaptive parameters are determined through comparative simulation under three kinds of operating conditions. The results show that, compared with traditional PI control and traditional VDM control, the proposed control strategy has great superiorities in control effect and flexibility, and the anti-interference and dynamic response abilities of the system are significantly improved.

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“…Reference [16] proposed a control method to suppress instability due to DC current limitations. Several current limitation methods used for the protection of an inverter from fault current have been proposed in the field of power electronics [17,18]. Many of these methods introduce the concept of virtual impedance in the control system, and Ref.…”

Section: Introductionmentioning

confidence: 99%

Internal Induced Voltage Modification for Current Limitation in Virtual Synchronous Machine

et al. 2022

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Virtual inertia control is a methodology to make inverter-based resources (IBR) behave like a synchronous machine. However, an IBR cannot fully emulate the response of synchronous machine because of its low-current capacity. When the inertial response of an IBR is affected by the current limitation, the synchronization of the synchronous machine simulated virtually inside the IBR controller with the other synchronous generators in the grid is affected, which may cause step-out of the simulated generator. We propose a methodology which can keep the synchronization by modifying internal induced voltage of the simulated generator to follow the system voltage change. The proposal is validated by the simulation using a nine-bus transmission system model including two synchronous generators and a large-scale IBR. The result of the generator trip simulation shows that the proposed method suppresses the phase angle variation while the current is limited, and avoids the instability regarding the synchronism. Furthermore, the impact of the current limitation on frequency stability is also evaluated through the simulation study and it is found that as the amount of output suppression increases, the frequency nadir falls, but the rate-of-change of frequency is hardly affected.

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Harmonic Current and Inrush Fault Current Coordinated Suppression Method for VSG Under Non-ideal Grid Condition

Cited by 40 publications

References 31 publications

State of the Art of the Techniques for Grid Forming Inverters to Solve the Challenges of Renewable Rich Power Grids

State of the Art of the Techniques for Grid Forming Inverters to Solve the Challenges of Renewable Rich Power Grids

Parameter-Adaptation-Based Virtual DC Motor Control Method for Energy Storage Converter

Internal Induced Voltage Modification for Current Limitation in Virtual Synchronous Machine

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