Current Weighting Distribution Control Strategy for Multi-Inverter Systems to Achieve Current Sharing

Wu, Tsai‐Fu; Wu, Yu-En; Hsieh, Hui-Ming; Chen, Yukai

doi:10.1109/tpel.2006.886622

Cited by 57 publications

(23 citation statements)

References 24 publications

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“…According to nonlinear control and linearization theory [26], from (6), the open-loop averaged output-voltage dynamics can be derived as (8) where the symbol represents the average value over one switching cycle. In order to linearize and achieve good reference tracking of the output voltage, the following controller expression from the block diagram in Fig.…”

Section: Design Of the Output-voltage Regulation Loopmentioning

confidence: 99%

A Proportional-Resonant Controller-Based Wireless Control Strategy With a Reduced Number of Sensors for Parallel-Operated UPSs

Hasanzadeh

Onar

Mokhtari

et al. 2010

IEEE Trans. Power Delivery

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In this paper, a novel droop method to control the power sharing of parallel uninterruptible-power-supply (UPS) systems is presented. In a clear-cut contrast to the previously reported works, the controller is a proportional-resonant controller which ensures good transient response and steady-state objectives. Furthermore, the need for sensing the output current for the power-sharing control is removed by implementing it in a software routine. This brings a less complicated and less expensive structure in which the number of feedback sensors is reduced from three to two. The droop paralleling strategy is based on the drop in the inverter output frequency and amplitude. The application of proportional-resonant controllers based on internal model principle is also extended to parallel inverters, and its superior performance over the well-known proportional-integral-derivative controller is presented. In order to show the performance of the proposed system, two parallel-connected UPS systems are analyzed, and two types of linear and nonlinear loads are considered. The nonlinear load is compliant with IEC 62040-3 standard for class I UPS. The results show that the reduction of sensors does not result in any error, and the performance of the control system is excellent. To verify the proposed concept, the proposed strategy is implemented within two-625VA UPS systems. Several test results are provided for linear and nonlinear loads which validate the simulations results. The results indicate that the proposed parallel inverter structure offers a better system in terms of the number of feedback sensors, performance, and complication.

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Section: Design Of the Output-voltage Regulation Loopmentioning

confidence: 99%

A Proportional-Resonant Controller-Based Wireless Control Strategy With a Reduced Number of Sensors for Parallel-Operated UPSs

Hasanzadeh

Onar

Mokhtari

et al. 2010

IEEE Trans. Power Delivery

View full text Add to dashboard Cite

show abstract

“…Concerning the topology of each constituent module, the most widely used is a high frequency isolated dc/dc converter in series with a dc/ac inverter [3]- [5]. However, this kind of configuration is applicable only when the active power flow is unidirectional.…”

Section: Introductionmentioning

confidence: 99%

“…With the ramp comparison current control using a proportional integral (PI) regulator, accurate current tracking for individual modules cannot be obtained [3], [4], [9]. The hysteresis current control exhibits advantages such as simple implementation, robustness and high dynamic capability [5], [12], [13].…”

Section: Introductionmentioning

confidence: 99%

Parallel Connected High Frequency AC Link Inverters Based on Full Digital Control

Sha¹,

Guo²,

Deng³

et al. 2012

Journal of Power Electronics

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This paper presents a full digital control strategy for parallel connected modular inverter systems. Each modular inverter is a high frequency (HF) AC link inverter which is composed of a HF inverter and a HF transformer followed by a cycloconverter. To achieve equal sharing of the load current and to suppress the circulating currents among the modules, a three-loop control strategy, consisting of a common output voltage regulation (OVR) loop, individual circulating current suppression (CCS) loops and individual inner current tracking (ICT) loops, is proposed. The ICT loops are implemented with predictive current control from which high precision current tracking can be obtained. The effectiveness of the proposed control strategy is verified by simulation and experimental results from parallel connected two full-bridge HF AC link inverter modules.

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“…In these system architectures, the overall system failure rate increases and power efficiency after conversion by the inverter decreases when PV output is at less than 50%. In this study, we model various switching combinations using multiple parallel inverters at equal currents [7][8][9][10][11]. Regardless of PV power output, work can be controlled at the point of maximum efficiency and greater power generating efficiency can be obtained.…”

Section: Introductionmentioning

confidence: 99%

A study of DC-AC inverter optimization for photovoltaic power generation system

Kuo

2012

2012 IEEE Industry Applications Society Annual Meeting

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Traditionally, photovoltaic (PV) generating systems connect panels either in serial or parallel order prior to converting voltage using an inverter. The required capacity of an inverter increases in conjunction with the increasing scale of PV generating systems. This phenomenon increases overall system cost and prevents optimal power conversion; it also creates the risk of total system failure in the event of inverter malfunction. Consequently, using a structure in which each panel is paired with its own inverter, this paper proposes a combination algorithm (CA) to serve as the basis for converter switching. This algorithm increases the efficiency of the PV generating system, reduces risk of malfunction, and optimizes power distribution to inverters. In addition, if energy can be distributed to multiple inverters that switch on in sequence instead of simultaneously, the most efficient conversion of total energy will be enabled, increasing conversion efficiency. Modeling and field testing results show that increases in PV efficiency for low power output are highly significant. This study is an important reference for PV system designers during initial planning stages.

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Current Weighting Distribution Control Strategy for Multi-Inverter Systems to Achieve Current Sharing

Cited by 57 publications

References 24 publications

A Proportional-Resonant Controller-Based Wireless Control Strategy With a Reduced Number of Sensors for Parallel-Operated UPSs

A Proportional-Resonant Controller-Based Wireless Control Strategy With a Reduced Number of Sensors for Parallel-Operated UPSs

Parallel Connected High Frequency AC Link Inverters Based on Full Digital Control

A study of DC-AC inverter optimization for photovoltaic power generation system

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