Capacitor Voltage Ripple Estimation and Optimal Sizing of Modular Multi-Level Converters for Variable-Speed Drives

Ke, Ziwei; Pan, Jianyu; Sabbagh, Muneer Al; Na, Risha; Zhang, Julia; Wang, Jin; Xu, Longya

doi:10.1109/tpel.2020.2988403

Cited by 24 publications

(18 citation statements)

References 23 publications

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“…The main parameters of the SMs include the number, the capacitance, the arm inductance and the working frequency. As is known, the voltage ripple ε of the capacitor in SMs is inversely proportional to the capacitance value and the frequency [25]:

\begin{equation}\varepsilon \propto \frac{1}{{f{C_{{\rm{SM}}}}}}.\end{equation}

…”

Section: Parameter Designmentioning

confidence: 99%

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A multi‐port hybrid circuit breaker integrated with power flow control ability

Zhang

2022

IET Generation Trans & Dist

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Power flow controllers and DC circuit breakers are compulsory components in a multi‐terminal DC grid with overhead lines. They are both composed of similar power electronic devices and thus can be reasonably combined together to realize cost savings. This paper proposes a multi‐port circuit breaker integrated with a multi‐port power flow controller (M‐PFCHCB). The topology structure, operation principles, control strategy and parameter configuration are illustrated in detail. The main breakers are composed of unidirectional power electronic switches, and the selection branch is based on two diode strings, which can significantly save the investment of the breaker. The proposed M‐PFCHCB is able to deal with the fault isolation and the ultra‐fast disconnector failure with high performance. Besides, the power flow of multiple lines can be simultaneously regulated by the M‐PFCHCB without any external power supply. The internal power balance is achieved by controlling the AC circulating current inside the M‐PFCHCB. The simulations conducted on PSCAD in a five‐terminal DC grid with eight DC lines verify the feasibility of the proposed M‐PFCHCB. The technical and economic analysis performed proves that the proposed M‐PFCHCB can achieve the comprehensive functions of fault isolation and power flow control with low construction cost.

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\begin{equation}\varepsilon \propto \frac{1}{{f{C_{{\rm{SM}}}}}}.\end{equation}

…”

Section: Parameter Designmentioning

confidence: 99%

“…In practice, the redundant series and parallel connections are demanded for high reliability of the breaker, but it should be noted that only the minimum number of the semiconductors required is presented in ( 23)- (25).…”

Section: Number Of the Semiconductors Requiredmentioning

confidence: 99%

A multi‐port hybrid circuit breaker integrated with power flow control ability

Zhang

2022

IET Generation Trans & Dist

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“…Due to the topology design, each of the module capacitors of the six-arms have to process single-phase AC power individually. Hence, the capacitor size is defined by the AC power processing requirements and is bulky [12], [13], [14], [15], [16], [17], [18], [19]. On the other hand, the integrated arm structure exploits the fundamental idea that net power requirement of a three-phase AC system is constant.…”

Section: B Dc-ac Converter Topologymentioning

confidence: 99%

“…There is continued research to address the capacitor sizing issues in MMC converters. Some efforts include capacitor size minimization by incorporating improved capacitor models and capacitor selection methods [12], [13]. Alternative studies propose advanced control structures for circulating current minimization to reduce the second-harmonic power oscillation to reduce capacitor size [14], [15].…”

Section: Introduction Mmentioning

confidence: 99%

A Minimal Capacitor Modular Converter for Ultra-Dense Power Conversion

Gupta¹

2021

Preprint

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<div>Modular multilevel power electronic converters are considered an increasingly critical family of converters for myriad high voltage high power applications. With the ever-growing emphasis on electrification of the economy, they play a crucial role in serving energy sources and loads whose electrical ratings go beyond the ratings of the conventional power electronic building blocks. In particular, modular multilevel converter (MMC) topology enjoy its dominance in such applications due to modularity, scalability, performance and fault-tolerance capability. However, the MMC topology design imposes low-frequency ac components on the module capacitors and thus is inhibited by the capacitor size. Capacitor sizing plays a significant role in the overall system’s size, cost and reliability. This paper introduces a minimal capacitor module based topology for DC to three-phase AC conversion. The unique design feature of the module includes minimal capacitor requirement due to elimination of single-phase ac power processing requirements. Together with improved power density, reduction of capacitor size permits the use of only film capacitors thus eliminating the weakest link of the overall system. Along with the step-by-step analytical derivation of the proposed approach, the paper presents detailed simulation studies, comparative analysis and experimental results from a proof-of-concept laboratory-scale prototype.</div>

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“…The current SM capacitor ripple analysis of the MMC mainly focuses on the typical MMC topology [23][24][25][26][27][28][29][30][31], and focuses on analysing the SM capacitor voltage ripple and its low frequency ripple suppression. There are few analyses on the capacitor ripple of SMs connected to PV panels or other distributed generators.…”

Section: Introductionmentioning

confidence: 99%

Unbalanced power control of a modular multilevel converter with photovoltaic resources and the capacitor voltage ripple analysis

Liu

Zhang

Wang

et al. 2022

IET Power Electronics

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The modular multilevel photovoltaic (PV) converter can achieve independent power control and help to increase the efficiency of the system. However, the output power among PV modules is unbalanced, which will result in the power loss of system if not properly controlled. This paper first introduces a power control scheme to adjust the power distribution among dc grid, ac grid and PV modules, and presents the mathematical bases of the scheme and the unbalanced power control of the strategy. However, the voltage ripple of MMC sub module (SM) capacitor is also an important parameter. In this system, the SM voltage ripple has not been analysed in relevant articles. Because there are many variables, it is not easy to analyse. Here, the voltage ripple law of the SM capacitor is analysed, by simplifying variables and presenting a fast analytical method, which has reference significance for the selection of SM capacitor. Matlab simulation and the hardware in the loop simulation experiment built by StarSim of Modelling Tech verify the effectiveness of the introduced control strategy and the correctness of the SM capacitor ripple analysis.

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Capacitor Voltage Ripple Estimation and Optimal Sizing of Modular Multi-Level Converters for Variable-Speed Drives

Cited by 24 publications

References 23 publications

A multi‐port hybrid circuit breaker integrated with power flow control ability

A multi‐port hybrid circuit breaker integrated with power flow control ability

A Minimal Capacitor Modular Converter for Ultra-Dense Power Conversion

Unbalanced power control of a modular multilevel converter with photovoltaic resources and the capacitor voltage ripple analysis

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