An inclusive review on different multi-level inverter topologies, their modulation and control strategies for a grid connected photo-voltaic system

Sinha, Akanksha; Jana, Kartick Chandra; Das, Madan Kumar

doi:10.1016/j.solener.2018.06.001

Cited by 98 publications

(49 citation statements)

References 99 publications

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“…• Whole active power should be transferred from PV panels to the grid. This is achieved by maintaining the overall DC-link voltage higher than that of the peak voltage of the grid [4,5]. • The current injected to the grid should be sinusoidal in shape and in phase with the grid voltage to maintain the unity power factor.…”

Section: Control Of Grid-connected Photovoltaic (Pv) Systemmentioning

confidence: 99%

“…The MLI in PV system offers a numerous advantage over the conventional two-level inverter-based systems, such as reduced dv/dt stress, better harmonic profile, lesser filter requirements, possibility of transformer-less grid interfacing with the renewable sources of energy and so on [2][3][4][5]. Among the classic MLI topologies [6,7], the cascaded H-bridge (CHB) topology [8][9][10] is the most attractive one; as the inverter consists of several identical H-bridge modules with a high degree of modularity and the future PV power expansion capability.…”

Section: Introductionmentioning

confidence: 99%

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Control of asymmetrical cascaded multilevel inverter for a grid‐connected photovoltaic system

Sinha

Das

Jana

2019

IET Renewable Power Generation

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This article presents a generalised asymmetrical cascaded multilevel inverter (MLI) for a single-phase grid-connected photovoltaic (PV) system and their control strategy. The control strategy, including maximum power tracking along with a suitable interface, is implemented for maximum power transfer from the PV source to the single-phase low-power grid. The balancing of DC-link voltages for an asymmetrical MLI under variable solar parameters as well as grid parameter variation is implemented using the proposed control strategy. The voltage controllers maintain the constant DC-link voltage ratio, whereas the current controller injects the sinusoidal current into the grid at unity power factor and track the grid voltage under variation of grid voltage using grid tracker. Stability analysis of the proposed grid-connected asymmetrical inverter system is also incorporated. The whole grid-tied PV system is simulated in the MATLAB/SIMULINK environment and the exhaustive simulation results of the system under different transient conditions are presented. In addition, a laboratory prototype for a low-power gridtied PV system has been developed and implemented using DS1103. The performance of the system is also tested at varying irradiance conditions and the corresponding experimental results are also presented.

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Section: Control Of Grid-connected Photovoltaic (Pv) Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Control of asymmetrical cascaded multilevel inverter for a grid‐connected photovoltaic system

Sinha

Das

Jana

2019

IET Renewable Power Generation

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“…Equations (11) and (12) are called decoupled power flow equations, which get modified with the impedance angle (φ) [11]. The UDC [10] can work with all impedances lying between −90°a nd +90°.…”

Section: Self-synchronised Universal Droop Controller (Sudc) For Ac Vmentioning

confidence: 99%

“…These downsides of the two-level inverter can be overpowered with a very efficient device called multilevel inverter (MLI). It offered numerous advantages such as lower-voltage stress, low harmonic distortion, lower switching loss, highefficiency, high-voltage, high-power applications and better electromagnetic compatibility [12][13][14]. The conventional MLI topologies embracing neutral point clamped (NPC), flying capacitor and cascaded H-bridge (CHB) require a large number of switches [insulated gate bipolar transistors (IGBTs)/metal-oxidesemiconductor field-effect transistors] and DC voltage sources, which increase with an increase in output voltage levels [13].…”

Section: Introductionmentioning

confidence: 99%

Control strategy of PV‐fed, grid‐interfaced, seven‐level T‐type MLI for distributed power generation

Sinha

Jana

Das

2019

IET Power Electronics

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The major concern with renewable sources of energy, feeding the distributed power generation system, is the power quality, reliability and efficiency of the system. This study proposes a novel topology comprising single-phase, seven-level, gridconnected photovoltaic-fed (PV) inverters in parallel. An important expediency of connecting multilevel inverters (MLIs) in parallel is that the failure of any source or the MLI module itself will never stop the overall generation, leading to improved efficiency and reliability of the system. This study also incorporates a novel controller comprising of two DC and an AC controller that independently controls the DC-link voltage of PV system and AC-side voltage so as to inject a pure sinusoidal current at unity power factor into the grid. Also, the AC controller discussed here is self-synchronising, i.e. aloof of phase-locked loop. The power mismatch problem that basically arises due to partial shading conditions in PV system has also been discussed. The MATLAB/Simulink-based proposed two seven-level grid-connected inverters in parallel are modelled and simulation results are presented. An experimental prototype of the PV-fed grid-connected system comprising two seven-level inverters in parallel is developed and tested to validate the simulation results.

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“…and the load [3]. MVSI appears to have overcomes the numerous drawbacks posed by the conventional two-level topologies [4,5]. Its modular nature makes it possible to achieve a high power rating by concatenating smaller power modules [4,6].…”

Section: Introductionmentioning

confidence: 99%

Performance comparison of series and parallel damped LCL filters using 5-level voltage source converter

et al. 2020

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The high harmonic content produced by conventional converters has resulted in the increased system size and cost, due to the need for large-sized low-order harmonic passive filters and cooling system requirement. Given that, multilevel inverters and special modulation techniques were developed to suppress or eliminate the low-frequency harmonics and the left behind high-order ones are eliminated using a high-frequency small-sized filter. Hence, this paper designs and compares the total harmonic distortion (THD) and efficiency values of three set of filters, namely LCL filter, LCL with series and parallel resistance on a novel five-level multilevel voltage source inverter topology. The novelty lies with the proposed inverter, which, apart from using a single direct current source, it can extend it elimination capability beyond the normal five level using the concept of multiple switching per step and an optimised selective harmonic elimination pulse width modulation. The converter can eliminate eleven lower-order odd nontriplen harmonics, hence making the 37th harmonic at 1.85 kHz to be the first dominant harmonic. At 2-kW loading, two of the filters have THD below 5%, therefore satisfying the IEEE 519 standard. The parallel resistance damped filter (LCL-P-R) has less THD value but poor efficiency due to the resistance introduced into the circuit. The study was carried out using PSIM and MATLAB software.

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An inclusive review on different multi-level inverter topologies, their modulation and control strategies for a grid connected photo-voltaic system

Cited by 98 publications

References 99 publications

Control of asymmetrical cascaded multilevel inverter for a grid‐connected photovoltaic system

Control of asymmetrical cascaded multilevel inverter for a grid‐connected photovoltaic system

Control strategy of PV‐fed, grid‐interfaced, seven‐level T‐type MLI for distributed power generation

Performance comparison of series and parallel damped LCL filters using 5-level voltage source converter

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