Active power reserve photovoltaic virtual synchronization control technology

Zhang, Xing; Gao, Qian; Hu, Yuhua; Zhang, Haizheng; Guo, Zixuan

doi:10.23919/cjee.2020.000006

Cited by 36 publications

(8 citation statements)

References 5 publications

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“…Ref. [20] investigated the insufficient inertia support in PV power-generation systems. The dynamic stability mechanisms of different virtual inertia controls have not been comprehensively analyzed and compared.…”

Section: Fig 1 Diagram Illustrating Typical Dc-mg Configurationmentioning

confidence: 99%

Comparative analysis on the stability mechanism of droop control and VID control in DC microgrid

Lin

Zuo

et al. 2021

Chin. J. Electr. Eng.

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Voltage resonance and fluctuation deteriorate the stability of DC microgrids (DC-MGs) and restrict their popularization. Conventional droop control cannot suppress voltage fluctuation and damp oscillations. Therefore, new control methods, namely, droop+filter control and virtual inertia and damping control, are proposed. These methods differ owing to the addition of low pass filter (LPF) and virtual inertia loop. In this study, the stability of these control methods is investigated comprehensively to understand their differences arising from the use of LPF and inertia loop as well as the underlying dynamic stability mechanism. The leading causes of voltage instability in DC-MGs regulated by droop control are first presented. Subsequently, control methods for solving this issue are compared and their simplified small-signal models are constructed. Based on eigenvalue analysis, the DC-MG is equivalent to a third-order system. Different control effects can be acquired by changing the control parameters and the location of the eigenvalues; furthermore, they can be used to understand the dynamic stability. Eigenvalue analysis can provide parameter design guidelines. Finally, the simulation results verify the validity of the theoretical analysis.

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Section: Fig 1 Diagram Illustrating Typical Dc-mg Configurationmentioning

confidence: 99%

Comparative analysis on the stability mechanism of droop control and VID control in DC microgrid

Lin

Zuo

et al. 2021

Chin. J. Electr. Eng.

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“…, and u s12 (u 6 , u 1 ), respectively, which are illustrated in Figure 3. Finally, by evaluating the prediction errors of all the eight basic voltage vectors using the cost function defined in (5), an optimal voltage vector can be chosen and utilized to control the inverter during the next control cycle.…”

Section: Dual-vector Modulated Mpc Strategymentioning

confidence: 99%

“…Due to the advantages of two-level voltage source inverters, they have received more and more attention in the field of renewable energy generation systems, including photovoltaic systems and energy storage systems, among others. Recently, the control methods of two-level voltage source inverters have been widely studied to achieve smooth and flexible energy conversion [1][2][3][4][5]. As is known, vector control is widely used to control two-level voltage source inverters in renewable energy generation systems as it can achieve power decoupling control.…”

Section: Introductionmentioning

confidence: 99%

A Dual-Vector Modulated Model Predictive Control Method for Voltage Source Inverters with a New Duty Cycle Calculation Method

Cao

Li³

et al. 2020

Energies

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Recently, model predictive control (MPC) methods have been widely used to achieve the control of two-level voltage source inverters due to their superiorities. However, only one of the eight basic voltage vectors is applied in every control cycle in the conventional MPC system, resulting in large current ripples and distortions. To address this issue, a dual-vector modulated MPC method is presented, where two voltage vectors are selected and utilized to control the voltage source inverter in every control cycle. The duty cycle of each voltage vector is figured out according to the hypothesis that it is inversely proportional to the square root of its corresponding cost function value, which is the first contribution of this paper. The effectiveness of this assumption is verified for the first time by a detailed theoretical analysis shown in this paper based on the geometrical relationship of the voltage vectors, which is another contribution of this paper. Moreover, further theoretical analysis shows that the proposed dual-vector modulated MPC method can also be extended to control other types of inverters, such as three-phase four-switch inverters. Detailed experimental results validate the effectiveness of the presented strategy.

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“…The fluctuation introduced by the intermittent and uncertain nature of DGs may cause drastic impacts on system dynamic performance [12,13]. To solve this problem, the virtual synchronization scheme by imitating the rotor dynamics of the SG (synchronous generator) is proposed and widely adopted for DGs [14], and also applied in the DC distribution system.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical control scheme for proportional power sharing and robust operation in multiple virtual synchronization‐based DC/DC converters

Ye²,

Liu

et al. 2022

IET Generation Trans & Dist

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Virtual synchronization control can be applied to DC/DC converter for enhanced inertia support by imitating the rotor dynamics of the synchronous generator (SG). However, efficient power sharing and robust operation ability cannot be guaranteed in a multiple parallel‐operated DC/DC converters system. This paper proposes the hierarchical control scheme to achieve higher efficiency and superior anti‐disturbance ability for multiple DC/DC converters with virtual synchronization‐based control. The primary control layer enables proportional power sharing by using improved virtual synchronization control for each DC/DC converter, which aims at eliminating the influence of line parameter mismatch among converters. The secondary control layer deals with DC voltage stability improvement through the extended disturbance‐observer‐based backstepping control with the consideration of external power fluctuation on the whole system. Two control levels are integrated as the hierarchical control architecture to realize different control objectives in different time scales, while only neighbouring communications and DC voltage information are needed among the system. Simulations on PSCAD/EMTDC are conducted and show that the load power is accurately and proportionally shared, while system oscillations are eliminated with the extended disturbance‐observer‐based backstepping control, which validates the advantages of the proposed hierarchical control scheme.

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Active power reserve photovoltaic virtual synchronization control technology

Cited by 36 publications

References 5 publications

Comparative analysis on the stability mechanism of droop control and VID control in DC microgrid

Comparative analysis on the stability mechanism of droop control and VID control in DC microgrid

A Dual-Vector Modulated Model Predictive Control Method for Voltage Source Inverters with a New Duty Cycle Calculation Method

Hierarchical control scheme for proportional power sharing and robust operation in multiple virtual synchronization‐based DC/DC converters

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