An FPGA‐based switching photovoltaic‐connected inverter topology for leakage current suppression in grid‐connected utilizations

Grid-connected buck-boost inverters are used in wide input-voltage range application. However, there is a shoot-through problem in traditional gridconnected inverters. Moreover, voltage stress of semiconductors is high in conventional buck-boost inverters. Therefore, a grid-connected buck-boost inverter without shoot-through issue and with reduced voltage stress is presented. The proposed inverter is a single-stage system. When input voltage is higher than the grid voltage, the proposed inverter works in buck mode; when input voltage is lower than the grid voltage, it operates in boost mode. Thus, voltage stress of semiconductors is reduced. Only one switch is operated in high frequency in each period, so efficiency of the inverter can be improved.Operating principle of the proposed inverter is illustrated. Voltage stress analysis, loss calculation, and filter design guidelines and example are given.Finally, simulation and experimental results of a 300-W proposed inverter confirm the theoretical analysis.

Section: Resultsmentioning

confidence: 99%

“…Renewable resources are used as the input sources in microgrids and renewable power generation systems. [1][2][3] The gridconnected inverter is often used as an interface between the grid and renewable energy resources. 4,5 It can be classified into voltage-source and current-source grid-connected inverters.…”

Section: Introductionmentioning

confidence: 99%

Grid‐connected buck–boost inverter without shoot‐through issue and with reduced voltage stress

Yao

2021

“…Here, the hardware approach is concluded by the statement that the withstand capability of the proposed ACDM control is exceptional even though three LPFs, adder, subtractor, and multiplication block-sets are removed from the control. Hence, the proposed control structure can be used for grid-tied solar PV system 25,26 without or a bit of adjustment in a far case. An application of CTF-based ACDM is presented for double-stage grid-tied solar PV system.…”

Section: Case Iv: Comparative Analysismentioning

confidence: 99%

An improved control strategy of grid‐tied solar photovoltaic system using active current detection method

Jalan

Babu

Sridharan

et al. 2021

Summary This paper presents an active current detection method (ACDM) for three‐phase grid‐tied solar photovoltaic (PV) system. The proposed control utilizes the character triangular function (CTF) for fundamental component extraction and minimizes the computational burden. This shows the effectiveness of proposed ACDM under variety of operating conditions. Moreover, the design of control algorithm allows superior voltage regulation in outer voltage control loop, which reduces the peak overshoot during transients. This will also help in regulating grid current quickly, and it accurately follows the reference current. Further, the proposed control algorithm effectively deals with several power quality (PQ) issues and maintains the continuous power flow to satisfy the load demand. Finally, the withstand capability of the proposed ACDM controller is verified by simulation studies under MATLAB®/Simulink environment and experimentally validated by dSPACE‐1104 based downscaled laboratory prototype.

“…The current source inverter (CSI) has been utilized in different applications as it can perform as single‐stage boost inverter which is needed in various renewable energy applications 4,12–15 . The CSI offers, in addition, only boosting capability in DC/AC power conversion compared to VSIs.…”

Section: Introductionmentioning

confidence: 99%

“…The current source inverter (CSI) has been utilized in different applications as it can perform as single-stage boost inverter which is needed in various renewable energy applications. 4,[12][13][14][15] The CSI offers, in addition, only boosting capability in DC/AC power conversion compared to VSIs. CSIs suffer from several demerits as high cost, size, and hardware component count due to the presence of a bulk DC-link inductor and output C-L filter that are mandatory for DC-link current smoothing and output voltage filtering, respectively.…”

mentioning

confidence: 99%

Three‐phase two‐leg buck‐boost DC‐AC inverter with differential power processor unit

Hossam-Eldin

Elserougi

Abdelsalam

et al. 2020

Renewable energy sources (RESs) need power-electronics-based converters to deliver the acquired power to the grid. Those converters should provide voltage-bucking/boosting capabilities to accommodate various grid modes specially for three-phase distorted commonly unbalanced distribution utility networks. Several power electronic-based converters have been elaborated to fulfill this high-demand market. Single-stage converters are the most dominant in the market where the current source inverters (CSIs), impedance source inverters (ZSIs), and boost inverters are the high-end candidates. The aspects of cost, footprint, and minimal numbers of active switches, in addition to simplified controllability, build the main challenges that face the evolution of robust renewable energy-associated grid-tied converters. This paper presents a novel three-phase differential-mode buck-boost inverter based on two bidirectional buck-boost DC/DC converters and one differential power processor (DPP) unit. The proposed topology is a single-stage DC/AC converter offering bucking/boosting capability, with reduced hardware requirements. The proposed topology features a simplified control methodology in addition to reduced size and cost of the hardware setup which makes it more suitable for grid-tied renewable energy applications. The operation principles, small-signal model, and control strategy of the proposed topology are also illustrated. Simulation and experimental results are presented in details to verify the topologyenhanced performance under various operating conditions. The deducted results elucidate the viability of the proposed configuration alongside with the claimed merits. K E Y W O R D S DC/AC buck-boost inverter, DC/DC buck-boost converter, three-phase DC/AC inverter, threephase two-leg inverter 1 | INTRODUCTION Various renewable energy sources require the utilization of power electronics-based converter for maximum power tracking and grid integration purposes. The conventional two-level voltage source inverter (VSI) has been the most common grid-tied converter topology for DC/AC conversion applications. Due to the voltage buck nature of VSI, the