Multiphase Zero-Current Switching Bidirectional Converters and Battery Energy Storage Application

AC-DC converters with input power factor correction (PFC) that consist of two or more interleaved boost converter modules are popular in industry. PFC is a must in today's AC-DC converters as their input current must meet harmonic standards set by regulatory agencies.With interleaving, the input current of each module can make to be discontinuous and the size of their input inductors since interleaving can reduce the high ripple in each module and produce a net input current with a ripple that is comparable to that achieved with a single boost converter module with a large input inductor.In high-frequency converters, so as to achieve low harmonic, fast dynamic response, low size, and high-power density the frequency should be increased. The drawback of increasing the switching frequency is increasing the switching losses. This is reason that why soft-switching methods should be used. The focus of the thesis is on zero current switching (ZCS) methods for insulated gate bipolar transistor (IGBT) converters. The auxiliary switch in the proposed converter is activated whenever a main converter switch is about to be turned off, gradually diverting current away from the switch so that it can turn off with ZCS and eliminate the switching losses. In addition, the auxiliary circuit is designed in a way that it can be activated only when the converter is operating with heavier loads and not used when the converter is operating with light load to maximize the overall efficiency.The operation of the novel converter will then be explained and the mathematical analysis in steady-state will be derived. Based on the results of the analysis, general design guidelines will be provided. Finally, the design procedure will be confirmed by experimental results obtained from the proof of concept prototype.

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“…ZCS methods in boost converters have at least one of the following drawbacks [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]:…”

Section: Literature Reviewmentioning

confidence: 99%

A novel AC-DC interleaved ZCS-PWM boost converter

Rasoulinezhad

Abosnina

Moschopoulos

2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…In the DC-DC conversion area, a number of topologies, concepts and families of the SC converters are proposed in . For many high power applications, in kilowatt range, many new, attractive conversion methods based on SC converters are presented [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. (Fig.…”

Section: Introductionmentioning

confidence: 99%

A family of high-power multilevel switched capacitor-based resonant DC-DC converters – operational parameters and novel concepts of topologies

Stala

Пирог

Penczek

et al. 2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. This paper presents the concept of topologies and investigation results of switched-capacitor voltage multipliers designed for application in high power systems. The analyzed family of multilevel converters includes established topologies as well as novel concepts. The application of thyristors as well as the invention of novel concepts of multiplier topologies and appropriate control make it possible to achieve high efficiency, high voltage gain, reliable and simple DC-DC converters for high power systems. Based on analytical models of the SCVMs, the paper presents a discussion of the selection of components and the efficiency of the converters as a function of converted power as well as the voltage range on the input and the output side. The results are supported by computer simulations and demonstrative experimental tests. The SC converters operate using the principle of charge pumps and usually contain a large number of switches. However, high efficiency can be achieved in the SC converters by the application of resonant operation [4,15]. The SC converters can also be designed in an efficient way thanks to an appropriate selection of passive and active components [4,16]. The selection of the parameters of the passive components for an SCVM is a complex process and and it should be done considering the switch technology, power and required efficiency, which is demonstrated in [16].The SCVM topology is suitable for the application of thyristors as active switches [3,4,15]. Furthermore, the ability of bidirectional voltage blocking makes it possible to further optimize the SCVMs, as presented in [4,26,27], where the reduction of the number of switches is demonstrated in the topology called RSCVM. The application of thyristors creates possibilities for DC-DC conversion in resonant mode topology at high power, voltages and currents, owing to extremely high parameters of the thyristors. The resonant-mode operation is advantageous, because it makes turning-off the switches possible and assures zero current switching (ZCS) [4]. This paper, in Section 2, presents an analysis of the thyristor-based SCVM related to feasibility of the converter for high power application (Fig. 1a). The analytical results reach 500 kilowatts power, which makes it possible to demonstrate, in figures, the efficiency, range of currents as well as the value of LC parameters. Next, in Section 3, the thyristor-based topologies suitable for high power operation are presented (Figs. 1b, 1c, 1d). The evolution of the SCVM, presented in [4] is also

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“…Nevertheless, KAIST focused only on new topology development, and few equalization strategies were involved in its research. To improve efficiency and decrease switching loss, Yuang-Shung Lee further developed existing methods with soft switching technology [13], [15]. However, when cell voltage is taken as a criterion, soft switching complicates the circuit further.…”

Section: Introductionmentioning

confidence: 99%

Development of an Optimized Algorithm for Bidirectional Equalization in Lithium-Ion Batteries

Sun¹,

Zhu²,

Lu³

et al. 2015

Journal of Power Electronics

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Many equalization circuits have been proposed to improve pack performance and reduce imbalance. Although bidirectional equalization topologies are promising in these methods, pre-equalization global equalization strategy is lacking. This study proposes a novel state-of-charge (SoC) equalization algorithm for bidirectional equalizer based on particle swarm optimization (PSO), which is employed to find optimal equalization time and steps. The working principle of bidirectional equalization topologies is analyzed, and the reason behind the application of SoC as a balancing criterion is explained. To verify the performance of the proposed algorithm, a pack with 12 LiFePO4 batteries is applied in the experiment. Results show that the maximum SoC gap is within 2% after equalization, and the available pack capacity is enhanced by 13.2%. Furthermore, a comparison between previously used methods and the proposed PSO equalization algorithm is presented. Experimental tests are performed, and results show that the proposed PSO equalization algorithm requires fewer steps and is superior to traditional methods in terms of equalization time, energy loss, and balancing performance.

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Multiphase Zero-Current Switching Bidirectional Converters and Battery Energy Storage Application

Cited by 44 publications

References 22 publications

A novel AC-DC interleaved ZCS-PWM boost converter

A novel AC-DC interleaved ZCS-PWM boost converter

A family of high-power multilevel switched capacitor-based resonant DC-DC converters – operational parameters and novel concepts of topologies

Development of an Optimized Algorithm for Bidirectional Equalization in Lithium-Ion Batteries

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