Flexible power‐point‐tracking‐based frequency regulation strategy for PV system

Zhong, Cheng; Zhou, Yang; Zhang, Xiaoping; Yan, Gangfeng

doi:10.1049/iet-rpg.2020.0013

Cited by 34 publications

(18 citation statements)

References 28 publications

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“…At this time, the control strategy adopted by the energy storage system (ESS) should use constant DC voltage control to ensure that the DC voltage of the inverter is stable at the rated value. According to the SOC state of energy storage, PV can work in MPPT mode or FPPT mode [28][29][30][31][32]. (2) Grid-connected operation: In this operation condition, the system is connected to the power grid.…”

Section: The Control Strategy Of Voltage-frequency Controlled Vsgmentioning

confidence: 99%

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

Yan

Wang

et al. 2021

Electronics

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At present, the installed capacity of photovoltaic-battery energy storage systems (PV-BESs) is rapidly increasing. In the traditional control method, the PV-BES needs to switch the control mode between off-grid and grid-connected states. Thus, the traditional control mode reduces the reliability of the system. In addition, if the system is accidentally disconnected from the grid or the energy storage battery fails to work normally, the DC voltage of the inverter increases or decreases rapidly. To address these two problems, in this paper, a united control strategy is proposed. In the case of grid connection, based on the voltage-frequency controlled VSG strategy, the strategy adjusts the output power of the VSG by changing the position of the primary frequency modulation curve. This method can ensure that, after the system is connected to the grid, excess PV power can be sent to the grid, or power can be absorbed from the grid to charge energy storage. In the off-grid state, the strategy uses FPPT technology and superimposes a voltage component onto the voltage loop to quickly balance the DC power and AC power of the inverter. This strategy can improve the reliability of the system’s power supply if the energy storage fails to work normally. Finally, a PV-BES model was built using MATLAB-Simulink, and the simulation results proved the effectiveness of the proposed strategy.

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Section: The Control Strategy Of Voltage-frequency Controlled Vsgmentioning

confidence: 99%

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

Yan

Wang

et al. 2021

Electronics

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show abstract

“…For PV sources participating in frequency/voltage regulation or support without energy storage, there are usually two kinds of technical solutions: the power reserve control (PRC) [10][11][12][13][14] and the active power control (APC). 5,[15][16][17][18][19][20][21] Both of them make the PV source operate below the maximum power point (MPP) to achieve the adjustment flexibility.…”

Section: Introductionmentioning

confidence: 99%

Active power control strategy based on characteristic curve fitting for photovoltaic sources

Cai¹,

Yang²,

Wang³

et al. 2023

Engineering Reports

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With the explosive growth of photovoltaic (PV) penetration, there is an increasingly urgent expectation for PV sources to provide a full range of ancillary services to the utility. The most critical issue for a PV source to support the power system is the flexible power regulating capability, whereas the PV sources generally operates in the maximum power point tracking (MPPT) mode to maximize the solar harvest. This paper proposes an active power control strategy for PV sources based on a characteristic curve fitting method. With the proposed control strategy, PV sources can operate in the MPPT mode or adaptively switch to the power dispatch mode to flexibly regulate its output power to track the power reference. The characteristic curve fitting method does not require an irradiation sensor, but it has a more stable performance under rapid and continuous change in irradiation with simple calculation and error control since its extremely high similarity with the P–U characteristics of the PV source. Simulation is performed based on a detailed PV dynamic model to validate the proposed control strategy.

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“…In [12], the traditional droop control was also improved, and the frequency deviation and frequency change rate were suppressed by using the fast power compensation strategy to adjust the frequency of the system. The authors of [13,14] proposed a frequency modulation control strategy based on load shedding technology. This strategy combined the maximum power tracking algorithm, tracked the power in real time through curve fitting, and predicted the light intensity to implement better frequency regulation.…”

Section: Introductionmentioning

confidence: 99%

Two-Stage Grid-Connected Frequency Regulation Control Strategy Based on Photovoltaic Power Prediction

2023

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The large number of photovoltaics connected to the distribution network via power electronic converters squeezes the functional space of traditional synchronous generators in the power system and reduces the inertia of the network itself. However, due to the random and fluctuating nature of PV power generation, different types of meteorological conditions can also affect the inertia support capability of PV output power. Therefore, this paper proposes a frequency regulation control strategy based on the dynamic characteristics of the grid-side DC capacitor. Firstly, the control strategy of the grid-side inverter is improved and the mechanism of the frequency dynamic response model under PV penetration is analysed. Secondly, data from different weather types are correlated and analysed to predict PV power, and wireless sensor technology is used to introduce the data signals into the control link. Finally, a simulation model of a two-stage PV power generation system is developed and the fast-response capability of the system under different control parameters when the load is increased or decreased is analysed. The results show that under the proposed frequency regulation strategy, the larger the regulation coefficient and virtual inertia time constant, the greater the virtual inertia provided by the PV power generation, which improves the stability of the distribution network.

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Flexible power‐point‐tracking‐based frequency regulation strategy for PV system

Cited by 34 publications

References 28 publications

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

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

Active power control strategy based on characteristic curve fitting for photovoltaic sources

Two-Stage Grid-Connected Frequency Regulation Control Strategy Based on Photovoltaic Power Prediction

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