Improved PR Control Strategy for an LCL Three-Phase Grid-Connected Inverter Based on Active Damping

Li, Yahui; Zhang, Jing; Hao, Zhenghang; Tian, Peng

doi:10.3390/app11073170

Cited by 12 publications

(10 citation statements)

References 37 publications

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“…44,45 Due to this, an appropriate filter is required as an interface between the converter and the grid to reduce the harmonic content. 44,45 Among the different types of filters, such as inductor, inductor-capacitor, and inductor-capacitor-inductor (LCL), the LCL filter is the most effective. It attenuates high-frequency interference strongly.…”

Section: Filtermentioning

confidence: 99%

“…The output current of the PWM-based grid-connected VSCs contains higher-order harmonics, which adversely affect the power quality and safe operation of the power grid. 44,45 Due to this, an appropriate filter is required as an interface between the converter and the grid to reduce the harmonic content. 44,45 Among the different types of filters, such as inductor, inductor-capacitor, and inductor-capacitor-inductor (LCL), the LCL filter is the most effective.…”

Section: Filtermentioning

confidence: 99%

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A hierarchical optimization technique for placement of battery energy storage system to improve grid transient stability

Shams,

Chowdhury,

Islam

et al. 2024

Energy Storage

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A battery energy storage system (BESS), due to its very fast dynamic response, plays an essential role in improving the transient frequency stability of a grid. The performance of the BESS varies with the system's installation site. Hence, the optimal location of the BESS is of utmost importance for improving transient frequency stability. Therefore, this paper presents a hierarchical approach for optimizing the BESS placement to improve a grid's transient frequency stability. In most research, frequency nadir and rate of change of frequency (ROCOF) have been considered for studying frequency stability. This paper considers two more parameters, along with frequency nadir and ROCOF, to study the transient frequency stability, settling time, and decay ratio. A novel frequency stability index (FSI) using the four transient frequency parameters has been developed. After a significant disturbance in a benchmarked test system, the FSI was used to identify the optimal location of the BESS for stabilizing the frequency. It has been observed that, after a sudden generator outage, the ROCOF and the frequency nadir improve the best when the BESS is located at the bus closest to the generator experiencing the outage. However, considering the other two parameters as well, the value of the FSI is the minimum; that is, the optimum solution is when the BESS is located at the bus that is the second closest to the generator experiencing the outage. Results of similar studies validate the proposed FSI in indicating the optimal location of the BESS in improving the transient frequency behavior of the system.

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Section: Filtermentioning

confidence: 99%

Section: Filtermentioning

confidence: 99%

A hierarchical optimization technique for placement of battery energy storage system to improve grid transient stability

Shams,

Chowdhury,

Islam

et al. 2024

Energy Storage

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“…Based on the analysis of equations describing the behavior of the flter, a new methodology integrating the design of the flter inductances, a predictive controller and an active damping method have been developed. Li et al have proposed an improved proportional resonant (PR) control strategy for a three-phase grid-connected inverter with LCL flter based on active damping [56]. In this work, the authors frst compared and analyzed the proportional resonance technique and the quasiproportional resonance to the improved PR controller.…”

Section: Challengesmentioning

confidence: 99%

Backstepping Controller Design for Power Quality Improvement in a Two-Stage Grid-Connected Photovoltaic Systems with LCL Filter

Bendé,

Tchoffo Houdji,

Tchaya

et al. 2023

International Transactions on Electrical Energy Systems

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In a grid-connected photovoltaic system, the quality of energy injected by the photovoltaic system into the grid is directly linked to the topology of the inverter used and to the efficiency of its control technique. This paper addresses this problem for a two-level grid-connected photovoltaic inverter operating under low irradiance conditions. The aim is to reduce the harmonic distortion on the electrical network and therefore improve its power quality. To achieve this goal, a control strategy was set up considering the nonlinearity of the dynamic system, and the high dimension of the system model. Thus, a nonlinear controller designed using the backstepping technique is proposed. The effectiveness of this control strategy was evaluated by simulation in MATLAB/Simulink. Results show that the proposed control technique significantly improves the power quality of the grid-connected photovoltaic system by minimizing the current harmonic distortion rates in low irradiance conditions. The current harmonic distortion rates obtained for solar irradiance of 1000 W/m2, 750 W/m2, 500 W/m2, and 250 W/m2 are 0.48%, 0.78%, 1.22%, and 2.16%, respectively. The power factor is 0.988, and the DC bus voltage is maintained at its reference voltage of 600 V with a very low response time during the transient phases. A comparison of our simulation results with those found in the literature on other control techniques such as proportional-integral-derivative (PID) and synergetic controls shows the efficiency, superiority, and satisfactory performance of the proposed control scheme to minimize harmonic distortion under low irradiance conditions. The robustness and better dynamic performance of the proposed backstepping controller under varying irradiance conditions have also been shown.

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“…Three‐phase VSI fed LCL filter with PR current controller for microgrid system is implemented in ref. [19]. However, the design of filter components and mitigation of PQ issues related to damping techniques are not solved.…”

Section: Introductionmentioning

confidence: 99%

Control of distribution static compensator with active damped inductor‐capacitor‐inductor filter using dual loop αβ‐frame current controllers for power quality improvement

Arunagiri

Rajpurohit

Jain

2022

IET Energy Syst Integration

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A distribution system is connected with many non-linear loads, and generated harmonies are mitigated by using distribution static compensator (DSTATCOM) which is coupled at the point of common coupling through a voltage source inverter (VSI) and filter circuit. High-frequency switching ripples are generated along with the output of the VSI during pulse width modulation switching. Inductor-capacitor-inductor (LCL) filter is used to suppress the high frequency switching noises. Still, the primary concern about the LCL filter is generation of resonance peak at the resonance frequency. The conventional synchronous reference frame dq current controller with LCL filter has a complex coupling between d and q axis; hence decoupling is very difficult. This research article presents a new technique based on active damped dual loop αβ-frame current controllers to control the DSTATCOM with LCL filter for achieving improved load compensation. The dual loop controller is enhanced by using capacitor current in the inside loop and grid current at the outside loop with proportional resonant (PR) regulator parallel with harmonic compensator (HC). The proposed method effectively dampens the resonance peak under stationary reference frame ðαβÞ: The PR controller offers unlimited gain at the fundamental frequency and HC can offer more gain at the specific harmonic frequencies. Hence, characteristics of the PR and HC controllers used together to achieve minimum steady-state error and the problematic decoupling are ignored. The complete DSTAT-COM model with proposed control scheme is discussed with PR and (PR + HC) controllers separately under balanced, unbalanced source voltage. Stability analysis is carried out through Bode and pole-zero plots to judge the performance of the proposed current controllers. The obtained results, including total harmonic distortion of the source current, are compared with conventional passive damped dq-frame current controller. K E Y W O R D Scurrent controller, distribution static compensator, harmonic compensator and pulse width modulation, power quality | INTRODUCTIONIn a distribution system (DS), the term power quality (PQ) means achieving a better quality of power with a reliable supply and improved quality in the voltage and current waveform. But various non-linear loads and apparatus are connected to the system; hence, harmonics are generated and affect the consumers. Many conflicts such as impulses, voltage sag, swell, notches, and unbalances in the voltage and current are degrading the quality of power. Therefore, to improve the PQ, compensation devices and technologies have been developed. Custom power devices (CPD) are classified as shunt and series connected devices [1]. Among, distribution static compensator (DSTATCOM) is a shunt-connected expedient used to obtainThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Improved PR Control Strategy for an LCL Three-Phase Grid-Connected Inverter Based on Active Damping

Cited by 12 publications

References 37 publications

A hierarchical optimization technique for placement of battery energy storage system to improve grid transient stability

A hierarchical optimization technique for placement of battery energy storage system to improve grid transient stability

Backstepping Controller Design for Power Quality Improvement in a Two-Stage Grid-Connected Photovoltaic Systems with LCL Filter

Control of distribution static compensator with active damped inductor‐capacitor‐inductor filter using dual loop αβ‐frame current controllers for power quality improvement

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