Two-stage PV grid-connected control strategy based on adaptive virtual inertia and damping control for DC-link capacitor dynamics self-synchronization

Tian, Aina; Wu, Yang; Hu, Zhaorui; Wang, Zhikun; Wu, Tiezhou; Jiang, Jiuchun; Peng, Zinan

doi:10.1016/j.est.2023.108659

Cited by 5 publications

(3 citation statements)

References 27 publications

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“…Consequently, D needs to be correspondingly increased to suppress the growth of σ% and ts. These two phases belong to the acceleration phase of the rotor angular frequency, because |ω − ωn| becomes gradually larger and increasing J suppresses the rapid increase in ω but also increases σ% and ts; By comparing the effects of J and D on the output power and frequency, we find that it is difficult to balance the speed and stability of the system with fixed parameters [34]. To enhance the control performance of the VSG, the adaptation of VSG parameters can be achieved by considering the characteristics of different stages within the system.…”

Section: Dynamic Performance Analysis and Control Optimizationmentioning

confidence: 96%

“…However, the system's settling time becomes longer. By comparing the effects of J and D on the output power and frequency, we find that it is difficult to balance the speed and stability of the system with fixed parameters [34]. To enhance the control performance of the VSG, the adaptation of VSG parameters can be achieved by considering the characteristics of different stages within the system.…”

Section: Dynamic Performance Analysis and Control Optimizationmentioning

confidence: 99%

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A Bidirectional Grid-Friendly Charger Design for Electric Vehicle Operated under Pulse-Current Heating and Variable-Current Charging

Jin,

Wang,

et al. 2023

Sustainability

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Low-temperature preheating, fast charging, and vehicle-to-grid (V2G) capabilities are important factors for the further development of electric vehicles (EVs). However, for conventional two-stage chargers, the EV charging/discharging instructions and grid instructions cannot be addressed simultaneously for specific requirements, pulse heating and variable-current charging can cause high-frequency power fluctuations at the grid side. Therefore, it is necessary to design a bidirectional grid-friendly charger for EVs operated under pulse-current heating and variable-current charging. The DC bus, which serves as the medium connecting the bidirectional DC–DC and bidirectional DC–AC, typically employs capacitors. This paper analyzes the reasons why the use of capacitors in the DC bus cannot satisfy the grid and EV requirements, and it proposes a new DC bus configuration that utilizes energy storage batteries instead of capacitors. Due to the voltage-source characteristics of the energy storage batteries, EV instructions and grid instructions can be flexibly and smoothly scheduled by using phase-shift control and adaptive virtual synchronous generator (VSG) control, respectively. In addition, the stability of the control strategy is demonstrated using small signal modeling. Finally, typical operating conditions (such as EV pulse preheating, fast charging with variable current, and grid peak shaving and valley filling) are selected for validation. The results show that in the proposed charger, the grid scheduling instructions and EV charging/discharging instructions do not interfere with each other, and different commands between EVs also do not interfere with each other under a charging pile with dual guns. Without affecting the requirements of EVs, the grid can change the proportion of energy supply based on actual scenarios and can also obtain energy from either EVs or energy storage batteries. For the novel charger, the pulse modulation time for EVs consistently achieves a steady state within 0.1 s; thus, the pulse modulation speed is as much as two times faster than that of conventional chargers with identical parameters.

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Section: Dynamic Performance Analysis and Control Optimizationmentioning

confidence: 96%

Section: Dynamic Performance Analysis and Control Optimizationmentioning

confidence: 99%

A Bidirectional Grid-Friendly Charger Design for Electric Vehicle Operated under Pulse-Current Heating and Variable-Current Charging

Jin,

Wang,

et al. 2023

Sustainability

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show abstract

“…Among the various renewable energy technologies, PV systems are a primary contributor to renewable energy production (Abdolmaleki;Berardi, 2024). However, the fluctuation and unpredictability of solar energy production require the utilization of effective power electronics converters to easily incorporate photovoltaic (PV) systems into the electrical grid (Rout, 2023;Tian et al, 2023;Zhao et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Robust line voltage sensor-less control of grid-connected MMC converter in PV Applications

Alia,

Merzouk,

Rezaoui

2024

SEES

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This paper discusses the voltage sensor-less control of a single-phase grid-connected Modular Multilevel Converter (MMC) in photovoltaic (PV) applications. The design of the control system is crucial to efficiently injecting PV power into the main grid. Therefore, three control targets are designed. Maximum power point tracking (MPPT) through the Incremental Conductance (IC) algorithm, DC link voltage regulation, and finally output active and reactive power controlling throughout the regulation of grid current amplitude and phase shift. To achieve those targets, the value of grid voltage has to be known accurately. The main contribution of this study is the use of a Simplified Super Twisting Algorithm Sliding Mode Observer (SSTA-SMO) for grid voltage estimation. The effectiveness and satisfactory performance of the proposed system are validated through simulations via MATLAB. To verify the effectiveness of the proposed approach. A study was conducted to evaluate the efficacy of the SSTA-SMO proposal in comparison to a traditional sliding-mode observer. The objective was to showcase the superiority of the proposed approach. The results suggest that the suggested observer surpasses other methods in terms of several aspects, including minimal errors in grid voltage observation, high-quality estimation of grid voltage, and accurate tracking of the reference. Furthermore, it exhibits robustness when exposed to different levels of radiation.

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Reactive power decoupling control strategy for the grid-forming photovoltaic DC/AC converter

Yu,

Xu,

et al. 2024

Electric Power Systems Research

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Two-stage PV grid-connected control strategy based on adaptive virtual inertia and damping control for DC-link capacitor dynamics self-synchronization

Cited by 5 publications

References 27 publications

A Bidirectional Grid-Friendly Charger Design for Electric Vehicle Operated under Pulse-Current Heating and Variable-Current Charging

A Bidirectional Grid-Friendly Charger Design for Electric Vehicle Operated under Pulse-Current Heating and Variable-Current Charging

Robust line voltage sensor-less control of grid-connected MMC converter in PV Applications

Reactive power decoupling control strategy for the grid-forming photovoltaic DC/AC converter

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