Analysis of power losses in Z-source PV grid-connected inverter

Wang, Wei; Liu, Hongpeng; Zhang, Jiawan; Xu, Dianguo

doi:10.1109/icpe.2011.5944741

Cited by 16 publications

(6 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…freewheeling diode and DC diode 7 D , respectively. According to references [18] and [19], we can get the conducting loss of IGBTs and freewheeling diodes as shown in Formula (19) and Formula (20), respectively:   Figure 4 describes the input energy to the output energy of LVC-qZSI. Meanwhile, the energy loss is classified in detail.…”

Section: Power Loss Ratiomentioning

confidence: 99%

An Integration Optimization Strategy of Line Voltage Cascaded Quasi-Z-Source Inverter Parameters Based on GRA-FA

Chen

et al. 2020

Energies

View full text Add to dashboard Cite

Setting reasonable circuit parameters is an important way to improve the quality of inverters, including waveform quality and power loss. In this paper, a circuit system of line voltage cascaded quasi-Z-source inverter (LVC-qZSI) is built. On this basis, the double frequency voltage ripple ratio and power loss ratio are selected as optimization targets to establish a multi-objective optimization model of LVC-qZSI parameters. To simplify the calculation, an integration optimization strategy of LVC-qZSI parameters based on GRA-FA is proposed. Where, the grey relation analysis (GRA) is used to simplify the multi-objective optimization model. In GRA, the main influence factors are selected as optimization variables by considering the preference coefficient. Then, firefly algorithm (FA) is used to obtain the optimal solution of the multi-objective optimization model. In FA, the weights of objective functions are assigned based on the principle of information entropy. The analysis results are verified by simulation. Research results indicate that the optimization strategy can effectively reduce the double frequency voltage ripple ratio and power loss ratio. Therefore, the strategy proposed in this paper has a superior ability to optimize the parameters of LVC-qZSI, which is of great significance to the initial values setting.

show abstract

Section: Power Loss Ratiomentioning

confidence: 99%

An Integration Optimization Strategy of Line Voltage Cascaded Quasi-Z-Source Inverter Parameters Based on GRA-FA

Chen

et al. 2020

Energies

View full text Add to dashboard Cite

show abstract

“…simple boost, maximum boost, maximum constant boost) [5][6][7] can be utilized for qZSI control in the same manner. Generally speaking, the voltage gain of the qZSI is …... 4 Whereas the voltage stress across the inverter bridge is BV in . In order to maximize the voltage gain and minimize the voltage stress on the inverter bridge, one needs to decrease the boost factor B and increase the modulation index M as much as possible.…”

Section: B) Boost Control Methodsmentioning

confidence: 99%

A Grid Connected Three Phase PV Quasi-Z-Source Inverter with Double Frequency Ripple Suppression Control

Chalasani¹

2017

ijecs

View full text Add to dashboard Cite

Abstract-In a Grid connected three-phase photovoltaic (PV) system, there is double-frequency power mismatch existed between the dc input and ac output. The double-frequency ripple (DFR) energy needs to be buffered by passive network. Otherwise, the ripple energy will flow into the input side and adversely affect the PV energy harvest. In a conventional PV system, electrolytic capacitors are usually used for this purpose due to their high capacitance. However, electrolytic capacitors are considered to be one of the most failure prone components in a PV inverter. In this project, a capacitance reduction control strategy is proposed to buffer the DFR energy in three-phase Z-source/quasi-Z-source inverter applications. Without using any extra hardware components, the proposed control strategy can significantly reduce the capacitance requirement and achieve low input voltage DFR. Consequently, highly reliable film capacitors can be used. The increased switching device voltage stress and power loss due to the proposed control strategy will also be discussed. The proposed system is simulated in MATLAB/Simulink platform.Index Terms-DC-link voltage balance, Zero voltage switching, Renewable Energy (RE).

show abstract

“…The ZSI and qZSI have all been applied to grid‐connected PV system [12, 17]. The control and power losses of qZSI grid‐connected PV system are also analysed in [18, 19]. However, the limitations described above are not overcome.…”

Section: Introductionmentioning

confidence: 99%

Coupled‐inductor single‐stage boost inverter for grid‐connected photovoltaic system

Zhou

Huang

Zhao

et al. 2014

IET Power Electronics

View full text Add to dashboard Cite

This study presents a coupled-inductor single-stage boost inverter for grid-connected photovoltaic (PV) system, which can realise boosting when the PV array voltage is lower than the grid voltage, converting dc voltage into ac voltage, feeding current to the grid with high-power factor and maximum power point tracking (MPPT) together. By introducing an impedance network including coupled inductor in front of the three-phase inverter bridge, and adjusting the previously forbidden shoot-through zero state, the converter can step up input voltage to a higher voltage level. System reliability is also improved by using shoot-through zero state as a normal operation mode. Cost can be reduced by single-stage operation and also by using economical MPPT method only via grid current. Theoretical analysis, simulation and experimental results are presented to verify its good performance.

show abstract

Analysis of power losses in Z-source PV grid-connected inverter

Cited by 16 publications

References 5 publications

An Integration Optimization Strategy of Line Voltage Cascaded Quasi-Z-Source Inverter Parameters Based on GRA-FA

An Integration Optimization Strategy of Line Voltage Cascaded Quasi-Z-Source Inverter Parameters Based on GRA-FA

A Grid Connected Three Phase PV Quasi-Z-Source Inverter with Double Frequency Ripple Suppression Control

Coupled‐inductor single‐stage boost inverter for grid‐connected photovoltaic system

Contact Info

Product

Resources

About