Cascaded H-bridge multilevel converter multistring topology for large scale photovoltaic systems

Rivera, Sebastian; Kouro, Samir; Wu, Bin; Leon, Jose I.; Rodríguez, José; Franquelo, Leopoldo G.

doi:10.1109/isie.2011.5984437

Cited by 196 publications

(76 citation statements)

References 16 publications

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“…Various transformer-less and transformer-isolated dc-dc power conversion topologies have been proposed for grid-connected PV applications [4,16,26]. In the proposed topology, ML-DAB is the first power conversion stage that boosts up the dc voltage obtained from the PV array and also In order to synthesize the 5L voltage , switching pulses and resulting voltage waveforms are defined with respect to angular distances (i.e., , ) instead of the duty cycle.…”

Section: Dc-dc Power Conversion Stagementioning

confidence: 99%

A Modular Multilevel Converter with Power Mismatch Control for Grid-Connected Photovoltaic Systems

et al. 2017

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Abstract:A modular multilevel power converter configuration for grid connected photovoltaic (PV) systems is proposed. The converter configuration replaces the conventional bulky line frequency transformer with several high frequency transformers, potentially reducing the balance of systems cost of PV systems. The front-end converter for each port is a neutral-point diode clamped (NPC) multi-level dc-dc dual-active bridge (ML-DAB) which allows maximum power point tracking (MPPT). The integrated high frequency transformer provides the galvanic isolation between the PV and grid side and also steps up the low dc voltage from PV source. Following the ML-DAB stage, in each port, is a NPC inverter. N number of NPC inverters' outputs are cascaded to attain the per-phase line-to-neutral voltage to connect directly to the distribution grid (i.e., 13.8 kV). The cascaded NPC (CNPC) inverters have the inherent advantage of using lower rated devices, smaller filters and low total harmonic distortion required for PV grid interconnection. The proposed converter system is modular, scalable, and serviceable with zero downtime with lower foot print and lower overall cost. A novel voltage balance control at each module based on power mismatch among N-ports, have been presented and verified in simulation. Analysis and simulation results are presented for the N-port converter. The converter performance has also been verified on a hardware prototype.

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Section: Dc-dc Power Conversion Stagementioning

confidence: 99%

A Modular Multilevel Converter with Power Mismatch Control for Grid-Connected Photovoltaic Systems

et al. 2017

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“…It has the ability to inherently balance the DC link voltages while also modifying any of those voltages. Such independent control over the DC links allows tracking of the maximum power points associated with multiple PV arrays [17], [18].…”

Section: Capacitor Voltage Balancingmentioning

confidence: 99%

Optimization of Switching Losses and Capacitor Voltage Ripple Using Model Predictive Control of a Cascaded H-Bridge Multilevel StatCom

Townsend

Summers

Vodden

et al. 2013

IEEE Trans. Power Electron.

123

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. Abstract-This paper further develops a Model Predictive Control (MPC) scheme which is able to exploit the large number of redundant switching states available in a multi-level H-bridge StatCom (H-StatCom). The new sections of the scheme provide optimised methods to trade off the harmonic performance with converter switching losses and capacitor voltage ripple. Varying the pulse placement within the modulation scheme and modifying the heuristic model of the voltage balancing characteristics allows the MPC scheme to achieve superior performance to that of the industry standard phase shifted carrier modulation technique. The effects of capacitor voltage ripple on the lifetime of the capacitors is also investigated. It is shown that the MPC scheme can reduce capacitor voltage ripple and increase capacitor lifetime. Simulation and experimental results are presented that confirm the correct operation of the control and modulation strategies.

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“…The typical inverters used are Neutral Point Clamped (NPC) and Cascade H-Bridge (CHB) [48]. If a dc-dc stage is connected, an isolated 135 converter suites better for CHB as it needs independent dc input for each CHB used [49]. In the case of a NPC, non-isolated converter is connected in a previous stage [50].…”

Section: Introductionmentioning

confidence: 99%

Topologies for large scale photovoltaic power plants

Cabrera-Tobar

Bullich‐Massagué

Aragüés‐Peñalba

et al. 2016

Renewable and Sustainable Energy Reviews

137

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The concern of increasing renewable energy penetration into the grid together with the reduction of prices of photovoltaic solar panels during the last decade have enabled the development of large scale solar power plants connected to the medium and high voltage grid. Photovoltaic generation components, the internal layout and the ac collection grid are being investigated for ensuring the best design, operation and control of these power plants. This article addresses the review of components as photovoltaic panels, converters and transformers utilized in large scale photovoltaic power plants. In addition, the distribution of these components along this type of power plant and the collection grid topologies are also presented and discussed.

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Cascaded H-bridge multilevel converter multistring topology for large scale photovoltaic systems

Cited by 196 publications

References 16 publications

A Modular Multilevel Converter with Power Mismatch Control for Grid-Connected Photovoltaic Systems

A Modular Multilevel Converter with Power Mismatch Control for Grid-Connected Photovoltaic Systems

Optimization of Switching Losses and Capacitor Voltage Ripple Using Model Predictive Control of a Cascaded H-Bridge Multilevel StatCom

Topologies for large scale photovoltaic power plants

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