Advanced Control Techniques to Improve the Efficiency of IPOP Modular QSW-ZVS Converters

Vázquez, Aitor; Rodríguez, Ángel Cervera; Lamar, Diego G.; Hernando, M.M.

doi:10.1109/tpel.2017.2705803

Cited by 24 publications

(4 citation statements)

References 45 publications

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“…In Figure 7, the integrated CLLC converter can achieve high voltage gain by increasing the CLLC resonant network. In [18], the master-slave modulation strategy is adopted between parallel modules to reduce the influence of current difference between modules and improve efficiency. However, once the master module has a malfunction, the slave will stop working.…”

Section: Non-isolated Tl-bdcmentioning

confidence: 99%

“…The three-level bidirectional DC/DC converters suitable for accessing the DC microgrid are mainly isolated [10][11][12][13] and non-isolated [14][15][16]. For energy storage side modular bidirectional DC/DC converter, when using input parallel, output parallel (IPOP), the current sharing issue between modules needs to be considered; when using input series, output series (ISOS), the voltage equalization issue needs to be considered; when using input parallel, output series (IPOS) or input side series connection, output side parallel (ISOP), both current sharing and voltage equalization issues need to be considered [17,18].…”

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Bidirectional DC/DC and SOC Drooping Control for DC Microgrid Application

Zhang

Guo

2020

Electronics

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In DC microgrids, distributed energy storage plays a key role in stabilizing the DC bus voltage. The bidirectional DC/DC converter in the distributed energy storage system should be designed according to the voltage level and electromagnetic isolation requirements, and multiple energy storage units should be coordinated for load current distribution according to the state of charge (SOC). This paper proposes a SOC power index droop control strategy by communication lines to coordinate the fast and high-precision distribution of load current among multiple energy storage units, and the SOC between energy storage units quickly converges to a consistent state. Considering that communication lines are susceptible to interference, this paper further proposes an improved SOC power index droop control to overcome the effects of communication line failures. Considering the high cost of the energy storage unit, it should be connected to the DC microgrid in layers to achieve a reasonable allocation of resources in practical applications. In order to provide high-quality power to a large power grid, the quantification standards of the DC bus fluctuation range and the working range of each converter are further discussed to maximize the stability of the DC bus voltage and grid-connected power fluctuation.Keywords: bidirectional DC/DC converter; DC microgrid; distributed energy storage; SOC (state of charge) droop control IntroductionDistributed energy storage is the key issue to solve the issue of grid-connected renewable energy generation. For example, it can improve the ability of the grid to accept wind and photovoltaic (PV) power [1-3]. A typical DC microgrid structure is mainly composed of a distributed generation unit, an energy storage unit, a load cell, and a grid-connected converter [4][5][6], as shown in Figure 1. DC microgrid research focuses on stabilizing the DC bus voltage to ensure the power balance of the system. To stabilize bus voltage fluctuations and solve energy supply volatility issues, adding energy storage devices can improve the device's voltage sag and the inrush issues caused by load-switching, changes in natural conditions, and instantaneous faults in DC microgrid systems; this improves the reliability and scheduling flexibility of the distributed generation grid connection. Using low bandwidth communication control reduces the long-distance stability and DC microgrid distribution of the system due to network delay packet loss and other issues. To avoid the risk caused by long-distance communication control, each unit is divided into three control layers according to the normalized voltage of DC bus and coordinated control of various units [7]. Compared with the two-level converter, the three-level converter has only half of the switches to change state peer cycle, and the voltage stress on the switch is only half of the bus voltage [8,9].

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Section: Non-isolated Tl-bdcmentioning

confidence: 99%

mentioning

confidence: 99%

Bidirectional DC/DC and SOC Drooping Control for DC Microgrid Application

Zhang

Guo

2020

Electronics

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“…Full-bridge converter is a typical isolated DC-DC converter topology, but it has many limitations in the wide input voltage range applications [3] [4] . In order to improve the input voltage range of full bridge converter, many solutions have been proposed [5] .…”

Section: Introductionmentioning

confidence: 99%

Wide Input Variable Mode ZVZCS Converter Design

2022

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With the emphasis on energy conservation and emission reduction in various countries, industries such as new energy power generation and electric vehicles have developed rapidly. In many applications, the converter needs to adapt to a wide input voltage range, for example, the input voltage range of electric car charger is 200 ~ 450V. Based on this, this paper proposes a wide-input variable-mode ZVZCS converter for electric vehicles with two operating modes. Before the MOSFETs of the lagging-legs is opened, the primary side current is extinguished by the auxiliary circuit to realize ZCS. Due to the parasitic inductance and diode of MOSFETs, ZVS is realized by MOSFETs on leading-legs. It not only broadens the input voltage range of the traditional phase-shifted full-bridge ZVZCS converter, but also keeps the advantages of the traditional phase-shifted full-bridge ZVZCS converter, such as wide load range and small duty cycle loss. Experimental results with 60 ~ 240 V input voltage are demonstrated to verify the advantages.INDEX TERMS DC/DC converter, wide input voltage range, variable mode, zero-voltage and zero-current switching (ZVZCS)

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“…High amount of inductance current ripple is desired in this manner that is restricted the maximum achievable managed by this method and current collective among the modules, total power is increased based on the quantity of modules. Advantage of this circuit is total current ripple was minimized and increased efficiency for low to intermediate load [1]. Fixed-frequency restricted three-phase DC-DC LCL-type series resonant converter with incorporated boost function is future for middle to great power applications with broad input voltage difference is typical of alternate energy sources.…”

Section: Introductionmentioning

confidence: 99%

Comparison of solar based closed loop DC-DC converter using PID and ANN control for shunt motor drive

Jayaprakash¹,

Ramani²,

Kavitha³

et al. 2019

IJPEDS

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<p>This paper explained details of Comparison of solar based closed loop DC -DC converter using PID and ANN Control for Shunt motor drive. Solar panel output is given to full bridge converter, stepup transformer, full wave converter, ∏ filter and Shunt motor drive are connected.Comparator compare the set value and the output signal of the motor produce a signal, based on the signal, full wave conveter produce the voltage to run the motor, Speed of motor,Torque and Armature current,Rise time,Peak time, Settling time and Steady state error are measured and evaluated by experimental.A circuit operation and simulation designed for a 1000 RPM speed of shunt motor arrived and tested.</p>

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Advanced Control Techniques to Improve the Efficiency of IPOP Modular QSW-ZVS Converters

Cited by 24 publications

References 45 publications

Bidirectional DC/DC and SOC Drooping Control for DC Microgrid Application

Bidirectional DC/DC and SOC Drooping Control for DC Microgrid Application

Wide Input Variable Mode ZVZCS Converter Design

Comparison of solar based closed loop DC-DC converter using PID and ANN control for shunt motor drive

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