A Systematic Method for Designing a PR Controller and  Active Damping of the LCL Filter for Single-Phase  Grid-Connected PV Inverters

Zhang, Ningyun; Tang, Hansong; Chen, Yao

doi:10.3390/en7063934

Cited by 139 publications

(86 citation statements)

References 20 publications

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“…13(a), the integrator output of synchronous d-axis voltage has a second harmonic component under the condition of 65 [Hz] cutoff frequency of the APF. As a result of the second ripple component, the estimated phase angle contains a ripple component as well, identical to the result in (13). However, the effect of phase error is reduced significantly by using the proposed algorithm, as shown in Fig.…”

Section: Methodssupporting

confidence: 58%

Analysis of Phase Error Effects Due to Grid Frequency Variation of SRF-PLL Based on APF

Seong¹

2016

Journal of Power Electronics

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This paper proposes a compensation algorithm for reducing a specific ripple component on synchronous reference frame phase locked loop (SRF-PLL) in grid-tied single-phase inverters. In general, SRF-PLL, which is based on all-pass filter to generate virtual voltage, is widely used to estimate the grid phase angle in a single-phase system. In reality, the estimated grid phase angle might be distorted because the phase difference between actual and virtual voltages is not 90 degrees. That is, the phase error is caused by the difference between cut-off frequency of all-pass filter and grid frequency under grid frequency variation. Therefore, the effects on phase angle and output current attributed to the phase error are mathematically analyzed in this paper. In addition, the proportional resonant (PR) controller is adapted to reduce the effects of phase error. The validity of the proposed algorithm is verified through several simulations and experiments.

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Section: Methodssupporting

confidence: 58%

Analysis of Phase Error Effects Due to Grid Frequency Variation of SRF-PLL Based on APF

Seong¹

2016

Journal of Power Electronics

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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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“…Accordingly, the traditional hysteresis loss calculation based on closed B-H curve is not suitable for inverter hysteresis loss calculation. The unclosed B-H curve should be adopted [21][22][23].…”

Section: Inductor Lossmentioning

confidence: 99%

Analysis of Power Loss and Improved Simulation Method of a High Frequency Dual-Buck Full-Bridge Inverter

et al. 2017

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Abstract:A high frequency dual-buck full-bridge inverter for small power renewable energy application is proposed in this paper. A switching frequency of 400 kHz is achieved with the adoption of the SiC power device. A two-pole two-zero (2P2Z) compensator is employed in the outer voltage loop to generate the current reference for inner current loop. A 3P3Z compensator is adopted in the inner current loop to track the current reference. A systematic way for calculating the losses of high frequency inverter is presented, and the losses of the components are thoroughly analyzed. The turn-on and turn-off procedures of the inverter are discussed in detail. The losses caused by high frequency are calculated accurately, and the loss distribution is established as well. The procedure of the loss analysis gives a practical example for calculating the loss of similar type inverters. Moreover, deviation between pulse width modulation (PWM) control signal and switching response in high frequency switching is thoroughly analyzed. The influence of deviation is verified by designed experiment. Hence, a compensation method is proposed in order to minimize the influence. The compensation effect is validated by experiment and simulation. Finally, a 1-kW prototype is built to verify the feasibility of the theoretical analyses. The grid-connected maximum output power experiment is completed at 1 kW with the efficiency of 96.1% and the total harmonic distortion (THD) of 1.8%. The comparison experiments of power loss between Si and SiC power devices are carried out. The experiment results confirm the loss calculation method to be valid.

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A Systematic Method for Designing a PR Controller and Active Damping of the LCL Filter for Single-Phase Grid-Connected PV Inverters

Cited by 139 publications

References 20 publications

Analysis of Phase Error Effects Due to Grid Frequency Variation of SRF-PLL Based on APF

Analysis of Phase Error Effects Due to Grid Frequency Variation of SRF-PLL Based on APF

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

Analysis of Power Loss and Improved Simulation Method of a High Frequency Dual-Buck Full-Bridge Inverter

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