RCPI controller-based multilevel multistring grid following inverter for large rooftop PV power plant application

IF 1.6 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Electrical Engineering Pub Date : 2024-09-02 DOI:10.1007/s00202-024-02643-x
Samrat Saha, Rajib Kumar Mandal
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Abstract

The modular multilevel grid following string inverter (MMGFSI) has gained popularity in large rooftop solar photovoltaic power (PV) plant applications, with grid-integrated net metering facility. The performance of the standard PI controller-based MMGFSIs during grid load disturbances is not satisfactory due to the wide ripples, low dynamic performance, and low steady-state precision of the inverter current feedback regulation. This study proposes a repetitive control proportional-integral (RCPI) controller approach for the cascaded H-bridge (CHB) five-level grid following inverter to synchronize with the grid and satisfy enhanced power quality standards IEEE519 for large rooftop solar PV plant application system. Additionally, this proposed control topology performance has compared to PI controller-based MMGFSI’s and repetitive controller cascaded PI controller-based MMGFSI’s system. The proposed RCPI MMGFSI’s system performance has been tested on a PSIM simulation environment on a grid-connected, photovoltaic (PV) system with a diversity of linear and nonlinear load disturbances to show the viability and resilience of the suggested repetitive control strategy in practice. To provide the necessary carrier control signal for the sinusoidal pulse width modulation block (SPWM), a cycle delay has introduced in the RCPI feedback path. As a result, reducing grid-side harmonic distortion lowers the cost of the LCL filter connected to the inverter output This RCPI-based MMGFSI has 4.1 percent less overall harmonic distortion than the conventional PI controller-based MMGFSI and 0.21 percent less total harmonic distorted than repetitive cascaded PI controller-based MMGFSI’s system. Additionally, a hardware prototype has RCPI controller MMGFSI’s implemented to evaluate the five-level CHB MLI structure and switching topology.

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基于 RCPI 控制器的多电平多串并网跟随逆变器,适用于大型屋顶光伏电站应用
模块化多电平并网型组串逆变器(MMGFSI)已在大型屋顶太阳能光伏电站应用中得到普及,并具有并网集成净计量设施。基于标准 PI 控制器的 MMGFSI 在电网负载扰动期间的性能并不令人满意,这是因为逆变器电流反馈调节的纹波大、动态性能低、稳态精度低。本研究针对级联 H 桥(CHB)五级电网跟随逆变器提出了一种重复控制比例积分(RCPI)控制器方法,以实现与电网同步,并满足大型屋顶太阳能光伏电站应用系统的增强型电能质量标准 IEEE519。此外,该控制拓扑还与基于 PI 控制器的 MMGFSI 系统和基于重复控制器级联 PI 控制器的 MMGFSI 系统进行了性能比较。建议的 RCPI MMGFSI 系统性能已在 PSIM 仿真环境中对具有多种线性和非线性负载干扰的并网光伏(PV)系统进行了测试,以显示建议的重复控制策略在实践中的可行性和弹性。为了给正弦脉宽调制模块(SPWM)提供必要的载波控制信号,在 RCPI 反馈路径中引入了周期延迟。与基于传统 PI 控制器的 MMGFSI 系统相比,基于 RCPI 的 MMGFSI 系统的总体谐波失真减少了 4.1%,总谐波失真减少了 0.21%。此外,为评估五级 CHB MLI 结构和开关拓扑,还实施了 RCPI 控制器 MMGFSI 硬件原型。
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来源期刊
Electrical Engineering
Electrical Engineering 工程技术-工程:电子与电气
CiteScore
3.60
自引率
16.70%
发文量
0
审稿时长
>12 weeks
期刊介绍: The journal “Electrical Engineering” following the long tradition of Archiv für Elektrotechnik publishes original papers of archival value in electrical engineering with a strong focus on electric power systems, smart grid approaches to power transmission and distribution, power system planning, operation and control, electricity markets, renewable power generation, microgrids, power electronics, electrical machines and drives, electric vehicles, railway electrification systems and electric transportation infrastructures, energy storage in electric power systems and vehicles, high voltage engineering, electromagnetic transients in power networks, lightning protection, electrical safety, electrical insulation systems, apparatus, devices, and components. Manuscripts describing theoretical, computer application and experimental research results are welcomed. Electrical Engineering - Archiv für Elektrotechnik is published in agreement with Verband der Elektrotechnik Elektronik Informationstechnik eV (VDE).
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