An Optimal PR Control Strategy with Load Current Observer for a Three-Phase Voltage Source Inverter

Dou, Xiaobo; Yang, Kang; Quan, Xiangjun; Hu, Qinran; Wu, Zheng-Mao; Zhao, Bo; Zhang, Shizhan; Jiao, Yang

doi:10.3390/en8087542

Cited by 18 publications

(12 citation statements)

References 18 publications

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“…The control loop delays can be modeled by using Z-transform theory as discussed in [21] with a zero-order-hold element to model sampling delay and a 1/Z block in series with the controller to model transport delay. The average-value model diagram representations of the inverter with the properties of sampling and transport delays while powering an RL and motor loads are shown in Figure 5a,b.…”

Section: Proposed Single-phase Offline Ups Systemmentioning

confidence: 99%

Elimination of the Inrush Current Phenomenon Associated with Single-Phase Offline UPS Systems

2016

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Abstract:Critical load applications always rely on UPS systems to uphold continuous power during abnormal grid conditions. In case of any power disruption, an offline UPS system starts powering the load to avoid blackout. However, this process can root the momentous inrush current for the transformer installed before the load. The consequences of inrush current can be the reduction of output voltage and tripping of protective devices of the UPS system. Furthermore, it can also damage the sensitive load and decrease the transformer's lifetime. To prevent the inrush current, and to avoid its disruptive effects, this research suggests an offline UPS system based on a current regulated inverter that eliminates the inrush current while powering the transformer coupled loads. A detailed comparative analysis of the conventional and proposed topologies is presented and the experiment was performed by using a small prototype to validate the performance, and operation of the proposed topology.

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Section: Proposed Single-phase Offline Ups Systemmentioning

confidence: 99%

Elimination of the Inrush Current Phenomenon Associated with Single-Phase Offline UPS Systems

2016

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“…The generation of photovoltaic renewable energy is the most attractive because of its high availability, the simplicity of the topology, and low cost compared to other resources of renewable energy. As a result, the number of grid-connected photovoltaic (PV) systems is increasing significantly, and studies to ameliorate their reliability and performance are progressing [1][2][3][4][5][6]. However, the high penetration level of distributed generation systems can have a negative influence on the global reliability and stability of the grid, especially under grid fault conditions such as voltage sags and with the use of more and more high-tech devices with good performance and high effectiveness but also with more sensitivity to their electric supply sources [7].…”

Section: Introductionmentioning

confidence: 99%

A Control Strategy for a Three-Phase Grid Connected PV System under Grid Faults

2019

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This paper proposes a Low-Voltage Ride-Through control strategy for a three-phase grid-connected photovoltaic (PV) system. At two stages, the topology is considered for the grid-tied system fed by a photovoltaic generator with a boost converter followed by a three-phase voltage source inverter. A flexible control strategy is built for the proposed system. It accomplishes the PV converter operations under the normal operating mode and under grid faults (symmetrical and asymmetrical grid voltage sag). The boost converter is controlled via an incremental conductance maximum power point tracking technique to maximize the PV generator power extraction. In the case of voltage sag, the implemented control strategy provides a switch between MPPT mode and non-MPPT mode to ensure the protection of the power converters. Theoretical modeling and simulation studies were performed, and significant results are extracted and presented to prove the effectiveness of the proposed control algorithm.

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“…The H-type full bridge and half bridge topologies, with the advantage of a simple structure and mature technology, are widely adopted by most of the traditional grid-connected inverters [1][2][3][4][5]. A family of five-level dual-buck full-bridge inverters with the advantages of multi-level, high reliability, and high efficiency are proposed in [11].…”

Section: Introductionmentioning

confidence: 99%

High Frequency Dual-Buck Full-Bridge Inverter Utilizing a Dual-Core MCU and Parallel Algorithm for Renewable Energy Applications

Meng¹,

Wang²,

Yang³

et al. 2017

Energies

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Abstract:A high frequency dual-buck full-bridge inverter for small power renewable energy applications is proposed in this paper. The implementation of the wide band gap SiC (Silicon Carbide) power device contributes to the high switching frequency of 400 kHz. This high frequency contributes to reduced converter volume as well as improved power density, which greatly strengthens its portability and application range. For the control strategy, a voltage-current dual loop controller is employed. A three-pole-three-zero (3P3Z) compensator is applied in the current loop in order to track the current reference without static error. A voltage loop two-pole two-zero (2P2Z) compensator is used to generate the current reference for stabilizing the DC bus voltage. Not only is the inner current loop analyzed in detail, which includes the modeling of the equivalent inductor-capacitor-inductor (LCL)-type inverter and the design of the 3P3Z compensator, but also the outer voltage loop is discussed, the model of which is established based on the energy balance. Furthermore, a feedback linearization method is adopted to simplify the duty cycle calculation and helps to accelerate the control speed. A second-order generalized integrator software phase lock loop (SOGI-SPLL) is employed to obtain the phase angle and to synchronize the inverter output current with the grid voltage. A parallel structure algorithm is conducted based on a dual-core microcontroller unit (MCU) for the first time to control the high frequency inverter. This approach avoids the contradiction between the high frequency operation and the limited computing capacity of the conventional single-core MCUs. The software structure, time-consuming distribution, and interactive communication method are analyzed in detailed. Finally, this paper verifies the feasibility of the theoretical analyses through simulation and experiments based on a 1 kW prototype.

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An Optimal PR Control Strategy with Load Current Observer for a Three-Phase Voltage Source Inverter

Cited by 18 publications

References 18 publications

Elimination of the Inrush Current Phenomenon Associated with Single-Phase Offline UPS Systems

Elimination of the Inrush Current Phenomenon Associated with Single-Phase Offline UPS Systems

A Control Strategy for a Three-Phase Grid Connected PV System under Grid Faults

High Frequency Dual-Buck Full-Bridge Inverter Utilizing a Dual-Core MCU and Parallel Algorithm for Renewable Energy Applications

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