Application of Series Type BTB Converter for Minimizing Circulating Current and Balancing Power Transformers in Loop Distribution Lines

Simanjorang, Rejeki; Miura, Yushi; Ise, Toshifumi; Sugimoto, Shigeki; Fujita, Hideki

doi:10.1109/pccon.2007.373088

Cited by 28 publications

(11 citation statements)

References 3 publications

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“…Note that with the same Leq, the circulating current will be 150A if the switching frequency is brought down to 20 kHz (see Equation [8]). To get the same circulating current value, the equivalent inductance should be increased to 10 times.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Various methods are applied to suppress the circulating current. The current path is removed either by using separate DC supplies to each inverter input [7] or by adding isolation transformers to each inverter output [8]. Increasing the impedance of the current path reduces the circulating current by adding coupled inductors (CIs) and common-mode inductors (CMIs) [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Parallel connected GaN E‐HEMT VSI‐based servo drives for PMSMs

Yuruk

Keysan

2021

IET Electric Power Appl

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The operation of parallel‐connected servo drives has the advantages of increasing the torque (hence the power) capacity, reliability, redundancy and modularity. However, smaller discrepancies of the system clocks of the independent microcontrollers, asynchronous pulse width modulation (PWM) carrier signals and hardware differences can make the output voltages of the parallel modules non‐identical, which results in circulating currents. These circulating currents limit the parallel operation, introduce additional power dissipation, cause unbalanced power distribution and degrade the control performance. To eliminate the circulating currents separated DC supplies, coupled inductors (CIs), PWM techniques, modified control techniques etc. are proposed in the literature. In this study, a fault‐tolerant parallel‐connected gallium nitride enhancement‐mode high electron mobility transistor voltage source inverter‐based servo drive scheme that eliminates the need for CIs and separate DC supplies and also enables the use of a standard proportional‐integral current control and a standard space vector PWM approach is proposed and tested. To evaluate the performances of the proposed scheme, up to six servo drives (limit‐6 × 7 Arms) are connected in parallel and tested under various conditions with a 24 V permanent magnet synchronous motor (nominal‐61.9 Arms). The results show that the parallel operation not only increases the torque capacity of the system but also increases modularity, flexibility, reliability and also redundancy.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Parallel connected GaN E‐HEMT VSI‐based servo drives for PMSMs

Yuruk

Keysan

2021

IET Electric Power Appl

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“…Optimal power flow (OPF) can be treated as a nonlinear multivariable constrained optimization procedure [29], [30]. Accordingly, constraints related to the network power flows and SOP thermal limits must be considered.…”

Section: Optimization Constraintsmentioning

confidence: 99%

An Extended Control Strategy for Weakly Meshed Distribution Networks With Soft Open Points and Distributed Generation

Ivic¹,

Stefanov

2021

IEEE Access

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As part of the smart grid concept, different strategies specialized for power flow control in distribution networks have been developed. One of the possible solutions to optimize the utilization of existing capacities and increase distributed generation penetration is the implementation of Soft Open Points. Soft Open Points are modular devices based on power electronic converters that enable closing loops in the network without negative consequences regarding fault current propagation. Introducing the concept of soft open points in the distribution network enables power flow control in a particular part of the network and voltage control in the soft open point connecting nodes. The control strategy proposed in this paper addresses the main obstacle for appropriate exploitation of soft open points, defining reference values for control variables in the case of large-scale distribution systems. Furthermore, the proposed strategy also deals with data unavailability problems, that is, soft open point control under communication interruption. The proposed control algorithm incorporates centralized optimal power flow calculations and an estimation algorithm based on a multivariate polynomial regression. The optimal power flow is used to calculate the control variables in normal operation modes. The procedure based on multivariate polynomial regression was used to estimate the reference values of the control variables when the optimal power flow results were unavailable. This feature makes the proposed algorithm applicable to communication interruptions when only limited data capture is available. The algorithm proposed in this study was implemented and tested on a test network considering different scenarios. Conclusions and simulation results make this algorithm applicable to an actual soft open point controller.

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“…The principal functionality of a back-to-back converter is the ability to control the active power flow between two AC subsystems. An interesting application that takes advantage of this property is the PBS applied to distribution networks [12,44,45], or in MGs [46]. Fig.…”

Section: Btb Controlled With the Synchronverter Approach Working As Amentioning

confidence: 99%

Control of a back‐to‐back converter as a power transfer system using synchronverter approach

Oñate

Posada

López

et al. 2018

IET Generation, Transmission & Distribution

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Application of Series Type BTB Converter for Minimizing Circulating Current and Balancing Power Transformers in Loop Distribution Lines

Cited by 28 publications

References 3 publications

Parallel connected GaN E‐HEMT VSI‐based servo drives for PMSMs

Parallel connected GaN E‐HEMT VSI‐based servo drives for PMSMs

An Extended Control Strategy for Weakly Meshed Distribution Networks With Soft Open Points and Distributed Generation

Control of a back‐to‐back converter as a power transfer system using synchronverter approach

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