Adaptive Virtual Inertia Synthesis via Enhanced Dispatchable Virtual Oscillator Controlled Grid-Tied Inverters

Aghdam, Sima Azizi; Agamy, Mohammed

doi:10.1109/iecon48115.2021.9589581

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…FIGURE 11 The impact of VI control on the frequency response [100] FIGURE 12 The impact of control methods on the RoCoF [100] FIGURE 13 Exchanged power during step-load=1pu [100] Figures [11][12][13] show the efficiency of the proposed method in presence of large transient. As it can be seen the adaptive VI control improves the RoCoF significantly and reduces the amount of exchanged power.…”

Section: Inertial Responsementioning

confidence: 99%

“…Another challenge with VOC implementation is that there is no compatible FRT strategy for VO-based controllers. This • Introducing uVOC and fast over-current limiting via a series compensator [16] Lack of power control in VdP and DZO [45,52,108] • Active and reactive power set-points tracking [45,52] • Introducing consensus-based controller [37,49,50] • Introducing modified Vdp and DZO [44,45] Grid synchronization [16,44] • Providing seamless transient between GFM and GFL mode by using conventional relay to control the connection switch • Employing virtual impedance method and uVOC [16] Lack of third order compensation in VdP [44,78] • Using Notch filter in grid-connected mode [44] • Using consensus-based oscillator [16,37,49,50] • Using uVOC and virtual impedance-based selective harmonic current suppression method [78] Interaction of power loop control [44,90] • Considering pure inductive or resistive network [37,44,50,108] • Using emulation of virtual impedance [16,44] Lack of inertial response [6] • Modifying dVOC and AHO by adding external virtual inertia control loop [100,103] Compatibility with other controller [44] • Tuning the control parameters such that all the units exhibit identical proportional load-sharing in steady-state [111] deficiency severely limits practical application of these controllers in GFM operation. Recently, [16] has proposed a structure enabling FRT by synchronization with arbitrarily l...…”

Section: Fault Managementmentioning

confidence: 99%

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Virtual oscillator‐based methods for grid‐forming inverter control: A review

Aghdam

Agamy

2022

IET Renewable Power Gen

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In inverter‐dominant power systems, grid‐forming (GFM) inverters regulate voltage and frequency. To construct GFM inverters, conventionally, various control methods based on synchronous machine emulation or droop characteristics have been employed. However, recently, inverters are regulated by Virtual Oscillator Control (VOC) to emulate the dynamics of a weakly nonlinear oscillators. In contrast to droop control, VOC is a time‐domain controller that enables interconnected inverters to stabilize arbitrary initial conditions to a synchronized sinusoidal limit cycle rapidly. The fast synchronization, accurate power sharing in grid‐connected and islanded modes, simple and robust implementation make it a promising candidate for inverter‐dominant power systems. Moreover, VOC removes the computational burden within machine emulation‐based methods and provides an approach to measure the frequency without employing phase‐locked loop (PLL). Hence, to leverage the advantages of this method and expand its application in power system control, this paper reviews different VOC implementations. Mainly, this paper focuses on the studies related to the fundamental theory of oscillators and design process. Additionally, there are discussions on the stability analysis of VOC‐based systems, harmonics and pre‐synchronization. Challenges on the compatibility with heterogeneous controllers, fault ride‐through and other limitations of VOC including non‐inertial response and coupled power control are investigated and solutions are outlined.

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Section: Inertial Responsementioning

confidence: 99%

Section: Fault Managementmentioning

confidence: 99%

Virtual oscillator‐based methods for grid‐forming inverter control: A review

Aghdam

Agamy

2022

IET Renewable Power Gen

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“…[18,19] compare and introduce three adaptive control strategies of a virtual synchronous generator from different perspectives. In order to avoid high-frequency noise and consider the influence of energy storage on a power grid, a segmented adaptive virtual inertia regulation method is proposed that improves the safety and reliability of the power grid [20,21]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Active Inertia Control Strategy of MMC-HVDC Systems for Flexible Frequency Support

Lv,

Wang,

Zhang

et al. 2023

Electronics

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The Modular Multilevel Converter High Voltage Direct Current Transmission (MMC-HVDC) technology is considered to be the most feasible choice for high-voltage and high-power transmission systems, and its flexibility and high controllability provide a new solution for renewable energy grid integration. The MMC topology contains a large number of capacitors, which enables it to provide a certain active inertia support for the connected AC system. Different from a synchronous machine, the active inertia control of an MMC can flexibly adjust a system’s inertia-supporting power by changing the control parameters. By introducing a variation of the Sigmoid function with amplitude-limiting capability, this paper proposes an adaptive active inertia control strategy for the MMC-HVDC system. The proposed scheme adjusts the inertia constant adaptively according to the frequency change rate of the AC system, which can better respond to the frequency recovery performance. Finally, the MMC-HVDC simulation model is established in PSCAD/EMTDC to verify the effectiveness of the proposed control strategy.

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