Energy-Balance Modeling and Discrete Control for Single-Phase Grid-Connected PV Central Inverters

Meza, Carlos; Negroni, J.J.; Biel, Domingo; Guinjoan, F.

doi:10.1109/tie.2008.922595

Cited by 67 publications

(34 citation statements)

References 23 publications

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“…When the switching signal d(t) = 1, the inductor voltage of Figs. 3(a) and 4(a) can be expressed as (8) and (9), respectively…”

Section: (T)mentioning

confidence: 99%

“…The multiloop control was modified to reduce the circulating current in parallel full-bridge converters in [6], [7], and [10]. In addition, the maximum power point tracking scheme and the multiloop control were integrated to control the PVbased grid-tied system [8], [9]. For the parallel full-bridge inverters, the multiloop control with the centralized voltage loop and the individual current loops was proposed in [12].…”

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confidence: 99%

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Bidirectional Current Sensorless Control for the Full-Bridge AC/DC Converter With Considering Both Inductor Resistance and Conduction Voltages

Chen

Liao

2014

IEEE Trans. Power Electron.

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Abstract-The full-bridge converter is often connected between the ac grid and the dc bus. In the conventional multiloop control, the inner current control loop shapes the ac-side current waveform, and the outer voltage control loop regulates the dc-bus voltage. In this paper, the single-loop bidirectional current sensorless control (BCSC) for the full-bridge ac/dc converter with considering both the inductor resistance and conduction voltage is first proposed. The average-value behavior of the full-bridge ac/dc converter is analyzed and it is simplified to an equivalent single-switch model. Based on this developed equivalent model, BCSC is designed and implemented in the FPGA-based system. There is only voltage control loop in the proposed BCSC (i.e., no current control loop), but BCSC is able to regulate the dc-bus voltage and shape the acside current. The provided results in both the rectifier operation and the inverter operation demonstrate the effectiveness of the proposed BCSC.Index Terms-Current sensorless control, full-bride converter.

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“…When the switching signal d(t) = 1, the inductor voltage of Figs. 3(a) and 4(a) can be expressed as (8) and (9), respectively…”

Section: (T)mentioning

confidence: 99%

mentioning

confidence: 99%

Bidirectional Current Sensorless Control for the Full-Bridge AC/DC Converter With Considering Both Inductor Resistance and Conduction Voltages

Chen

Liao

2014

IEEE Trans. Power Electron.

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“…The control strategy for the cascade H-bridge multilevel PV converter is based on the control scheme described in [7] and extended in order to fulfill the requirements for this specific case, i.e., the control signals for the H-bridge multilevel PV converter have to be generated such that 1. the voltage of each PV string is set to a desired reference value (normally given by a maximum power point tracking (MPPT) algorithm), 2. a unity power factor and low harmonic distortion current is injected to the utility grid, and, 3. a multilevel step-like AC wave voltage is synthesized at the output of the converters. In order to accomplish the aforementioned objectives a control scheme, shown in Fig.…”

Section: Description Of the Control Strategymentioning

confidence: 99%

“…More recently, an energy balance sampled data model has been established to systematically design a digital PI voltage loop ensuring the system's stability in the framework of gridconnected PV systems with a single central inverter [7]. The aforementioned approach was also applied to the cascade-full bridge inverter topology where a linear P+R current controller and PSC-PWM modulation have been used [8].…”

Section: Introductionmentioning

confidence: 99%

Energy-balance and sliding mode control strategies of a cascade H-bridge multilevel converter for grid-connected PV systems

Negroni

Biel

Guinjoan

et al. 2010

2010 IEEE International Conference on Industrial Technology

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Abstract-This work presents the design of a sliding-mode based current controller for a Cascade Full Bridge Multilevel Inverter grid connected PV system. The design also includes a modulation strategy to share the control action among the cascade-connected bridges in order to concurrently synthesize a multilevel waveform and to keep each of the PVG at its maximum operating point. Experimental results are included to validate the proposed approach.

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“…Although the large central inverter method offers more economic advantages with increasing size, this approach offers poor energy harvesting because there is one centralized maximum power point tracking (MPPT) for the whole system. Moreover, partial shading and any mismatch between the PV modules can reduce efficiency [5]. A string inverter is another configuration for PV systems where a string of PV modules are connected to a single inverter integrated with MPPT.…”

Section: Introductionmentioning

confidence: 99%

Current Sensorless MPPT Control Method for Dual-Mode PV Module-Type Interleaved Flyback Inverters

Lee¹,

Lee²,

Lee³

2015

Journal of Power Electronics

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This paper presents a current sensorless maximum power point tracking (MPPT) control method for dual-mode photovoltaic (PV) module-type interleaved flyback inverters (ILFIs). This system, called the MIC (Module Integrated Converter), has been recently studied in small PV power generation systems. Because the MIC is an inverter connected to one or two PV arrays, the power system is not affected by problems with other inverters. However, since the each PV array requires an inverter, there is a disadvantage that the initial installation cost is increased. To overcome this disadvantage, this paper uses a flyback inverter topology. A flyback inverter topology has an advantage in terms of cost because it uses fewer parts than the other transformer inverter topologies. The MPPT control method is essential in PV power generation systems. For the MPPT control method, expensive dc voltage and current sensors are used in the MIC system. In this paper, a MPPT control method without current sensor where the input current is calculated by a simple equation is proposed. This paper also deals with dual-mode control. Simulations and experiments are carried out to verify the performance and effectiveness of the proposed current sensorless MPPT control method on a 110 [W] prototype.

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Energy-Balance Modeling and Discrete Control for Single-Phase Grid-Connected PV Central Inverters

Cited by 67 publications

References 23 publications

Bidirectional Current Sensorless Control for the Full-Bridge AC/DC Converter With Considering Both Inductor Resistance and Conduction Voltages

Bidirectional Current Sensorless Control for the Full-Bridge AC/DC Converter With Considering Both Inductor Resistance and Conduction Voltages

Energy-balance and sliding mode control strategies of a cascade H-bridge multilevel converter for grid-connected PV systems

Current Sensorless MPPT Control Method for Dual-Mode PV Module-Type Interleaved Flyback Inverters

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