Reactive Power Compensation and Optimization Strategy for Grid-Interactive Cascaded Photovoltaic Systems

Li, Liming; Li, Hui; Xue, Yaosuo; Liu, Wenxin

doi:10.1109/tpel.2014.2333004

Cited by 194 publications

(89 citation statements)

References 35 publications

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Section: Extracting Circuit Equationsmentioning

confidence: 99%

“…1, the individual arms in each leg are the same, so |i pj |=|i nj |. By summing equations (15) and (16) and by simplifying, we can calculate d/dt(i cirj ) for each leg as follows: (17) With respect to the above equation and according to (13) and (14), we have: (18) It is worth noting that the circulating currents of the individual arms of the legs have the same direction, thus the switching signals S pj (t) and S Nj (t) in equation (18) …”

Section: Extracting Circuit Equationsmentioning

confidence: 99%

“…Some of these have focused on analyzing the CMI structure in terms of harmonic contents and voltage stress across the switches [14][15][16], and others have introduced new advanced controllers to compensate reactive power for grid tied PV systems [17][18][19][20], to compensate the unequal voltages of separate PV modules [21,22], for the voltage control of the floating dc capacitors [23,24] and to track the maximum power point (MPP) in PV based CMI systems [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Novel Control of a Modular Multilevel Converter for Photovoltaic Applications

Shadlu¹

2017

Transactions on Electrical and Electronic Materials

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The number of applications of solar photovoltaic (PV) systems in power generation grids has increased in the last decade because of their ability to generate efficient and reliable power in a variety of low installation in domestic applications. Various PV converter topologies have therefore emerged, among which the modular multilevel converter (MMC) is very attractive due to its modularity and transformerless features. The modeling and control of the MMC has become an interesting issue due to the extremely large expansion of PV power plants at the residential scale and due to the power quality requirement of this application. This paper proposes a novel control method of MMC which is used to directly integrate the photovoltaic arrays with the power grid. Traditionally, a closed loop control has been used, although circulating current control and capacitors voltage balancing in each individual leg have remained unsolved problem. In this paper, the integration of model predictive control (MPC) and traditional closed loop control is proposed to control the MMC structure in a PV grid tied mode. Simulation results demonstrate the efficiency and effectiveness of the proposed control model.

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Section: Extracting Circuit Equationsmentioning

confidence: 99%

Section: Extracting Circuit Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Novel Control of a Modular Multilevel Converter for Photovoltaic Applications

Shadlu¹

2017

Transactions on Electrical and Electronic Materials

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“…The output voltage signal vsaq is composed of Δvsaqvga and decoupled variable ωLfiga d. Subsequently, vsa d and vsa q are sent to the "active and reactive components extraction" module, which produces the decisive active and reactive components, vsad_andvsa q by synchronizing with iga . And then the "voltage distribution and synthesization" module divides the vsa d_ and vsa q _ into the n cascaded PV inverter modules according to their respective active and reactive power contribution [13][14].…”

Section: Fig (4)fuzzy Logic Controller Block Diagrammentioning

confidence: 99%

Active & Reactive power Control of Large scale Grid Connected PV system by Cascaded Modular Multi-Level Inverters withFuzzy Logic Control Approach

2017

IJMTER

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Abstract-Due to its advantages like clean energy production and more abundance availability solar energy is the most concentrated topic from last 20 years. Grid connected PV system gaining its importance due to high demand of power across the globe. Now a days different topologies of Multilevel Inverters are developing. By using this multilevel inverters we can interface the PV systems with Grid easily and effectively. But PV system facing so many problems like power flow control and output voltage disturbances because PV systems produce irregular output voltages. This paper demonstrates the Cascade Multilevel inverter with Active and Reactive power control using Fuzzy logic control approach of for Grid Connected PV System. With the help of this model we can improve the performance of the total PV system. In this paper we proposed a 3-MW, 12-kV PV system with the Fuzzy Logic control strategy is modelled and simulated in MATLAB.

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“…[18][19][20][21], power quality enhancement [22][23][24][25][26][27], frequency control through active power curtailment (Freq.-Watt function) [13,[28][29][30], active power control (e.g. the P constraints) [31][32][33][34], and reliability-oriented thermal management/control [33,[35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Power control flexibilities for grid‐connected multi‐functional photovoltaic inverters

Yang

Blaabjerg

Wang

et al. 2016

IET Renewable Power Generation

167

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This study explores the integration issues of next-generation high-penetration photovoltaic (PV) systems, where the grid is becoming more decentralised and vulnerable. In that case, the PV systems are expected to be more controllable with higher efficiency and reliability. Provision of ancillary and intelligent services, such as fault ride-through and reactive power compensation, is the key to attain higher utilisation of solar PV energy. Such functionalities for the future PV inverters can contribute to reduced cost of energy, and thus enable more cost-effective PV installations. To implement the advanced features, a flexible power controller is developed in this study, which can be configured in the PV inverter and flexibly change from one to another mode during operation. Based on the single-phase PQ theory, the control strategy offers the possibilities to generate appropriate references for the inner current control loop. The references depend on system conditions and also specific demands from both system operators and prosumers. Besides, this power control strategy can be implemented in commercial PV inverters as a standardised function, and also the operation modes can be achieved online in predesigned PV inverters. Case studies have verified the effectiveness and flexibilities of the proposal to realise the advanced features.

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Reactive Power Compensation and Optimization Strategy for Grid-Interactive Cascaded Photovoltaic Systems

Cited by 194 publications

References 35 publications

Novel Control of a Modular Multilevel Converter for Photovoltaic Applications

Novel Control of a Modular Multilevel Converter for Photovoltaic Applications

Active & Reactive power Control of Large scale Grid Connected PV system by Cascaded Modular Multi-Level Inverters withFuzzy Logic Control Approach

Power control flexibilities for grid‐connected multi‐functional photovoltaic inverters

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