Droop Control With Improved Disturbance Adaption for a PV System With Two Power Conversion Stages

Liu, Hongpeng; Loh, Poh Chiang; Wang, Xiongfei; Yang, Yongheng; Wang, Wei; Xu, Dianguo

doi:10.1109/tie.2016.2580525

Cited by 57 publications

(24 citation statements)

References 23 publications

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“…However, in the aforementioned literature, the possible fluctuations of the dc links connected to the converters are neglected [15], [16]. Moreover, the dynamic of the primary sources is relevant to RESs like photovoltaic (PV), where power fluctuations are inevitable due to the solar irradiation variations and corresponding maximum-power-pointtracking (MPPT) scheme [14], [17].…”

Section: A Literature Review 1) Control Approaches Of Microgridsmentioning

confidence: 99%

Dynamic Characteristics Analysis and Stabilization of PV-Based Multiple Microgrid Clusters

Zhao

Yang

Wang

et al. 2019

IEEE Trans. Smart Grid

128

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As the penetration of PV generation increases, there is a growing operational demand on PV systems to participate in microgrid frequency regulation. It is expected that future distribution systems will consist of multiple microgrid clusters. However, interconnecting PV microgrids may lead to system interactions and instability. To date, no research work has been done to analyze the dynamic behavior and enhance the stability of microgrid clusters considering the dynamics of the PV primary sources and dc links. To fill this gap, this paper presents comprehensive modeling, analysis, and stabilization of PV-based multiple microgrid clusters. A detailed small-signal model for PV-based microgrid clusters considering local adaptive dynamic droop control mechanism of the voltage-source PV system is developed. The complete dynamic model is then used to access and compare the dynamic characteristics of the single microgrid and interconnected microgrids. In order to enhance system stability of the PV microgrid clusters, a tie-line flow and stabilization strategy is proposed to suppress the introduced interarea and local oscillations. Robustly selecting of the key control parameters is transformed to a multiobjective optimization problem which is solved by genetic algorithm (GA). The proposed damping controller can effectively damp the power oscillations and provide robust control performance under variable operating conditions. Theoretical analysis, simulation results under various scenarios are presented to verify the effectiveness of the proposed scheme.

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Section: A Literature Review 1) Control Approaches Of Microgridsmentioning

confidence: 99%

Dynamic Characteristics Analysis and Stabilization of PV-Based Multiple Microgrid Clusters

Zhao

Yang

Wang

et al. 2019

IEEE Trans. Smart Grid

128

View full text Add to dashboard Cite

show abstract

“…In practice, the single-phase PV systems (with the rated power typically below 6 kW) are connected to low voltage feeders with a large R/X ratio, meaning that the grid is mainly resistive. In that case, the injected active power P g has a droop relationship with the grid voltage level v gm [26], [27] that is represented by…”

Section: B Proposed Low Voltage Ride-through Strategymentioning

confidence: 99%

Low voltage ride-through of two-stage grid-connected photovoltaic systems through the inherent linear power-voltage characteristic

Yang

Sangwongwanich

Liu

et al. 2017

2017 IEEE Applied Power Electronics Conference and Exposition (APEC)

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In this paper, a cost-effective control scheme for twostage grid-connected PhotoVoltaic (PV) systems in Low Voltage Ride-Through (LVRT) operation is proposed. In the case of LVRT, the active power injection by PV panels should be limited to prevent from inverter over-current and also energy aggregation at the dc-link, which will challenge the dc-link capacitor lifetime if remains uncontrolled. At the same time, reactive currents should be injected upon any demand imposed by the system operators. In the proposed scheme, the two objectives can be feasibly achieved. The active power is regulated automatically through a proportional controller according to the voltage sag level and PV inherent characteristics (i.e., the voltage and power droop). Compared to prior-art LVRT schemes, the proposed method is cost-effective, as it is achieved by simply plugging the proportional controller into a maximum power point tracking controller without significant hardware or software modifications. In this way, the PV system will not operate at the maximum power point, whereas the inverter will not face any over-current challenge but can provide reactive power support in response to the grid voltage fault. Simulations have been performed on a 3-kW two-stage grid-connected single-phase PV system in the case of LVRT operation, where the results have verified the proposed control scheme in terms of fast dynamics and seamless operation mode transitions. Index Terms-Low voltage ride-through; active power control; grid-connected photovoltaic (PV) systems; droop characteristics; maximum power point tracking; two-stage PV systems.

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“…The droop control [4][5] can improve the operation characteristics of inverters when active frequency modulation and reactive power regulating control of synchronous generator _________________________ School of Information Engineering, Xiangtan University, Xiangtan, Hunan Province, China 411105 was used in inverter power control, but there is a problem of poor frequency resistance to load disturbance. If the inertia and damping characteristics of the synchronous generator can be simulated, this problem will be solved, so the virtual synchronous generator technology [6][7][8] emerges as the times require.…”

Section: Introductionmentioning

confidence: 99%

Fuzzy Control of Inertia for Virtual Synchronous Generator in Independent Micro-Grid with Multi Micro-Source

Chen¹,

Liao²

2018

dteees

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In the independent micro-grid containing multi micro-source, the virtual synchronous generator (VSG) control can improve the frequency response characteristics by adopting the fixed inertia, but which cannot act well both in the dynamic adjustment of VSG active power and frequency. To solve this problem, the fuzzy control of inertia (FCI) was proposed in this paper. Firstly, the mathematical model of VSG was established in the synchronous rotating reference frame, in addition, the influence of inertia on the characteristics of VSG was analyzed. Secondly, a fuzzy controller of inertia is designed, and the fuzzy control rules are obtained through the analysis of different operation conditions, so as to realize real-time dynamic adjustment of inertia. Finally, on condition that VSG was put into the micro-grid and load disturbance in isolated grid, the power and frequency response curves of VSG control and FCI control were compared in the simulation environment of Matlab/Simulink. The simulation results show that the proposed strategy can avoid instantaneous power oscillation when VSG was connected into micro-grid, and achieve effective optimization of frequency response curve.

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Droop Control With Improved Disturbance Adaption for a PV System With Two Power Conversion Stages

Cited by 57 publications

References 23 publications

Dynamic Characteristics Analysis and Stabilization of PV-Based Multiple Microgrid Clusters

Dynamic Characteristics Analysis and Stabilization of PV-Based Multiple Microgrid Clusters

Low voltage ride-through of two-stage grid-connected photovoltaic systems through the inherent linear power-voltage characteristic

Fuzzy Control of Inertia for Virtual Synchronous Generator in Independent Micro-Grid with Multi Micro-Source

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