A United Control Strategy of Photovoltaic-Battery Energy Storage System Based on Voltage-Frequency Controlled VSG

Yan, Xiangwu; Wang, Chenguang; Wang, Ziheng; Liang, Baixue; Wei, Xiaoxue

doi:10.3390/electronics10172047

Cited by 10 publications

(7 citation statements)

References 32 publications

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“…In our work, we proposed a dual-stage grid-connected PV system with an output LC filter [1], [10]- [12], as shown in Figure 1, which requires a DC/DC power converter as the link unit between the PV and the grid, unlike other types of single-stage systems [13], [14]. This paper presents a groundbreaking controller that uniquely integrates the PSO algorithm with backstepping control to optimize power extraction under partial shading conditions (PSC) while effectively addressing the system's non-linearity.…”

Section: Introductionmentioning

confidence: 99%

Non-linear control for enhanced solar power under partial shading and AC load variations

Khadija,

Ouadia,

Abdelmajid

2024

IJEECS

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This paper solves the control problem to track the maximum power in grid-connected PV systems to catch up with the changes and meet the energy demand, given the irregular and arbitrary nature of the solar source. Our work addresses the following objectives: i) extracting the maximum available power under partial shading, ii) and having a unit power factor. To achieve the above objectives, we have integrated two control components. The first one is dedicated to the extraction of the maximum power point (MPPT) particle swarming algorithm (PSO) with a backstepping controller, by shaking on the DC/DC converter duty cycle to increase the robustness and stability of the system. The backstepping control of the three-phase voltage source inverter is the second part. To verify the effectiveness of the introduced system, modelling and simulation are verified in MATLAB/Simulink.

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Section: Introductionmentioning

confidence: 99%

Non-linear control for enhanced solar power under partial shading and AC load variations

Khadija,

Ouadia,

Abdelmajid

2024

IJEECS

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“…In recent years, an increasing number of studies have focused on BESS applications such as electric vehicles [3], aircrafts [4], microgrids [5] or power systems [6]. BESSs needs a power electronic converter to control its power flow.…”

Section: Introductionmentioning

confidence: 99%

A Fault-Tolerant Bidirectional Converter for Battery Energy Storage Systems in DC Microgrids

et al. 2023

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Battery energy storage systems (BESSs) can control the power balance in DC microgrids through power injection or absorption. A BESS uses a bidirectional DC–DC converter to control the power flow to/from the grid. On the other hand, any fault occurrence in the power switches of the bidirectional converter may disturb the power balance and stability of the DC microgrid and, thus, the safe operation of the battery bank. This paper presents a fault-tolerant topology along with a fault diagnosis algorithm for a bidirectional DC–DC converter in a BESS. The proposed scheme can detect open circuit faults (OCFs) and reconfigure the topology to guarantee the safe and continuous operation of the system while it is connected to the DC microgrid. The proposed method can be extended to multi-phase structures of interleaved bidirectional DC–DC converters using only two power switches and n TRIACs to support the OCF occurrence on 2 × n switches of n legs. The proposed fault diagnosis algorithm detects OCFs only by observing the current of the inductors and does not require any sensor. Hence, the cost, weight, volume and complexity of the system is considerably reduced. Experimental results show that the reconfiguration of the converter, along with its fast fault detection, leads to fewer switches overloading and less DC voltage deviation.

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“…In terms of the nonlinearization of VSG power Angle characteristics and the setting of active power control parameters in gridconnected mode, [15] and [16] select the relative maximum power coefficient in the optional domain through the configuration of extreme value points to improve the stability of the system. Similarly, a team designed an adaptive controller based on the depth deterministic strategy gradient algorithm to adapt the internal parameters of the system, so that the system has stronger anti-interference performance and dynamic and static adjustment performance [17]. However, it does not consider the strong volatility of new energy under the premise of grid connection.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Adaptive Disturbance Rejection Control Strategy Based on VSG for Photovoltaic-Storage Grid-Connected Inverter

Kong,

Zhang,

Zhuolin

et al. 2023

IEEE Access

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In this paper, a nonlinear adaptive disturbance rejection control (NADRC) strategy is designed to overcome the limitations of the traditional virtual synchronous generator (VSG) control method in photovoltaic (PV) grid-connected energy storage systems. This strategy utilizes exact feedback linearization and linear optimal control theory to establish a nonlinear adaptive disturbance rejection control law based on the virtual synchronous generator. It achieves zero static error control and noise adaptive stabilization of the AC link in a multiple-input multiple-output system. Compared with the simulation results of the grid-connected inverter voltage and current double closed-loop (VACDCL) strategy, the nonlinear adaptive disturbance rejection control effectively mitigates the fluctuations in load current caused by the photovoltaic energy storage module. It ensures power tracking under variable power conditions and outperforms traditional PI dual-loop control in terms of dynamic and static regulation performance as well as grid-connected current quality. Furthermore, this strategy's anti-disturbance adaptive link can quickly respond to system disturbances like frequency drift, voltage oscillations, and load current variations, thereby improving system performance.

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A United Control Strategy of Photovoltaic-Battery Energy Storage System Based on Voltage-Frequency Controlled VSG

Cited by 10 publications

References 32 publications

Non-linear control for enhanced solar power under partial shading and AC load variations

Non-linear control for enhanced solar power under partial shading and AC load variations

A Fault-Tolerant Bidirectional Converter for Battery Energy Storage Systems in DC Microgrids

Nonlinear Adaptive Disturbance Rejection Control Strategy Based on VSG for Photovoltaic-Storage Grid-Connected Inverter

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