Unbalance Mitigation via Phase-Switching Device and Static Var Compensator in Low-Voltage Distribution Network

Liu, Bin; Meng, Ke; Zhang, Dong; Wong, Peter K.C.; Ting, Tian

doi:10.1109/tpwrs.2020.2998144

Cited by 33 publications

(15 citation statements)

References 32 publications

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“…Therefore, the value of FOSMC parameters must be selected in such a way that a compromise is achieved among the rise time, overshoot, convergence time, tracking error, overall damping along with chattering free smooth output. Therefore, the reference reactive power value is admirable tracked by the controlled trajectories when α is selected to be 0.5 and k d , k q are selected to be 5×10 6 , evidenced in Fig. 16(b).…”

Section: Performance Evaluation Under Unbalanced Load Conditionsmentioning

confidence: 99%

“…These can initiate abnormal operation of the equipment or assuredly trip the protection devices [5]. To cope with these concerns, fixed and switch reactors/capacitors banks and static VAR compensators (SVC) are established and executed [6]. However, these kinds of standard facilities have a few drawbacks such as large size, additional losses, inadequate bandwidth, and slow response time [7].…”

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confidence: 99%

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Analysis of Fractional Order Sliding Mode Control in a D-STATCOM Integrated Power Distribution System

et al. 2021

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At present, the disturbances like the voltage fluctuations, resulting from the grid's complexities and unbalanced load conditions, create severe power quality concerns like total harmonic distortion (THD) and voltage unbalance factor (VUF) of the grid voltage. Though the custom power devices such as distribution-static compensators (D-STATCOMs) improve these power quality concerns, however, the accompanying controller plays the substantial role. Therefore, this paper proposes a fractional-order sliding mode control (FOSMC) for a D-STATCOM to compensate the low power distribution system by injecting/absorbing a specific extent of the reactive power under disturbances. FOSMC is a non-linear robust control in which the sliding surface is designed by using the Riemann-Liouville (RL) function and the chattering phenomenon is minimized by using the exponential reaching law. The stability of FOSMC is evidenced by employing the Lyapunov stability criteria. Moreover, the performance of the proposed FOSMC is further accessed while doing its parametric variations. The complete system is demonstrated with a model of 400V, 180kVA radial distributor along with D-STATCOM under two test scenarios in MATLAB/Simulink environment. The results of the proposed controller are compared with the fixed frequency sliding mode control (FFSMC) and conventional proportional-integral (PI) control. The results validate the superiority of the proposed controller in terms of rapid tracking, fast convergence, and overall damping with very low THD and VUF.

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Section: Performance Evaluation Under Unbalanced Load Conditionsmentioning

confidence: 99%

mentioning

confidence: 99%

Analysis of Fractional Order Sliding Mode Control in a D-STATCOM Integrated Power Distribution System

et al. 2021

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“…A comprehensive formulation of the problem, which is based on unbalanced three-phase optimal power flow (UTOPF) and considers all operational constraints in the decisionmaking process, along with the linearization-based approach to solve the challenging mixed-integer non-convex programming (MINCP) problem is presented in our previous work [11]. However, the method will needs to be extended to support controllable resources, e.g., PV inverters, demand response or electric vehicles (EVs), motivating us to develop a more flexible yet efficient enough algorithm to solve the problem.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with our previous work, this paper focuses on optimal coordination of PSDs in real-time operation, while [12] investigates the optimal locations to place PRDs, [11] focuses on the day-ahead scheduling of both PSDs and static VAR generator based on predicted demand profiles, and [13] mainly discussed the optimal control PRDs when the network cannot be monitored all all nodes, which leads to an sensitivity-based approach. Moreover, an iteration-based algorithm is presented and compared with the complete linearization-based method in our previous work [11] and the method based on the famous UTOPF that is based on linear branch flow model [14]. The rest of the paper is structured as follows.…”

Section: Introductionmentioning

confidence: 99%

Load Balancing in Low-Voltage Distribution Networks via Optimizing Residential Phase Connections

Liu¹,

Geth²,

Mahdavi³

et al. 2022

Preprint

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Unbalance issues in low-voltage distribution networks (LVDN) can be worsened by increasing penetration of residential PV generation if unevenly distributed among three phases. To address this issue, the phase-switching device (PSD) provides a viable and efficient method by dynamically switching customers to other phases. This paper further investigates how to optimize residential phase connections by controlling PSDs efficiently. The optimization problem is formulated as a mixedinteger non-convex programming (MINCP) problem considering relevant operational requirements of an LVDN based on the exact formulation of unbalanced three-phase optimal power flow (UTOPF). Unlike most heuristic algorithms and the linearization techniques in our previous work, this paper proposes to solve the MINCP problem via an iteration-based algorithm after exact reformulations and reasonable approximations of some constraints. The proposed method is tested in a real LVDN and compared with the approach of Zhao et al. based on the well-known linear UTOPF formulation. Case studies based on the European low-voltage test feeder demonstrate the proposed method's efficiency in mitigating the network unbalance while ensuring network security and flexibility to deal with more controllable resources.

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“…However, network constraints were not taken into account either, which may lead to violated operational constraints. Most recently reported methods in addressing power unbalance in LVDN can be found in [17, 18], where network constraints are considered on a fully or partially observable network.…”

Section: Introductionmentioning

confidence: 99%

Optimal placement of phase‐reconfiguration devices in low‐voltage distribution network with residential PV generation

Liu

Meng

Zhang

et al. 2020

IET Renewable Power Generation

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As residential PV generation penetrates in the low‐voltage distribution network (LVDN), the unbalance issue may be intensified due to the asymmetry of generations/loads in different phases. Phase‐reconfiguration device (PRD), which can reconfigure connected phases of residential customers, provides an effective method to address this issue. Noting that although the benefit brought by PRDs can vary if they are placed at different locations in the network, little literature has been reported on this topic. To bridge the research gap, this paper presents a novel method to optimally place PRDs in an LVDN aiming at minimizing the power unbalance running through the distribution transformer. The problem considers both installation, operational constraints, and boils down to a challenging mixed‐integer non‐convex programming problem, which is then reformulated as an efficient solvable mixed‐integer linear programming problem. Moreover, operational constraints are relaxed with slack variables penalized in the objective function, which makes sure a feasible solution is always available without or with minimal operational violations. Case studies based on a modified IEEE system and a practical system in Australia demonstrate that an efficient strategy can be provided to address the unbalance issue while improving the network's power supply qualities.

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Unbalance Mitigation via Phase-Switching Device and Static Var Compensator in Low-Voltage Distribution Network

Cited by 33 publications

References 32 publications

Analysis of Fractional Order Sliding Mode Control in a D-STATCOM Integrated Power Distribution System

Analysis of Fractional Order Sliding Mode Control in a D-STATCOM Integrated Power Distribution System

Load Balancing in Low-Voltage Distribution Networks via Optimizing Residential Phase Connections

Optimal placement of phase‐reconfiguration devices in low‐voltage distribution network with residential PV generation

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