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Long, Chao; Wu, Jianzhong; Thomas, Lee; Jenkins, Nicholas (2016)
Publisher: Elsevier
Journal: Applied Energy
Languages: English
Types: Article
Subjects: Energy(all), Civil and Structural Engineering, TA
A soft open point (SOP) is a power electronic device, usually using back-to-back voltage source converters (VSCs), installed at a previously normally open point of a distribution network. Due to its flexible and accurate control of power flows, an SOP is versatile, and increasingly being considered to mitigate voltage and thermal constraints in medium voltage (MV) networks with high penetrations of distributed generation (DG). A Jacobian matrix - based sensitivity method was used to define the operating region of an SOP when the grids/feeders at the two terminals of the SOP have various load and generation conditions, and the SOP operating region was visualized in a graphical manner. The exact operating set-points were determined by adopting a non-linear optimization considering separately different objectives. The methodology was demonstrated on an 11 kV network, considering three optimization objectives with different DG penetrations and different network observabilities. Results showed that the use of an SOP significantly increases the network’s DG hosting capacity. The objective for voltage profile improvement increased the headroom of the voltage limits by the largest margin, at the expense of increased energy losses. In contrast the objectives to achieve line utilization balancing and energy loss minimization showed the most improvement in circuit utilization and in limiting energy losses. The work helps electricity network operators to visualize an SOP’s operation status, and provides high level decision support, e.g. selecting control schemes and restraining SOP operational boundaries.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • [1] Viawan FA, Karlsson D. Voltage and reactive power control in systems with synchronous machine-based distributed generation. IEEE Trans Power Del 2008;23(2):1079-87.
    • [2] Viawan FA, Sannino A, Daalder J. Voltage control with on-load tap changers in medium voltage feeders in presence of distributed generation. Electr Power Syst Res 2007;77(10):1314-22.
    • [3] Park JY, Nam SR, Park JK. Control of a ULTC considering the dispatch schedule of capacitors in a distribution system. IEEE Trans Power Syst 2007;22(2):755-61.
    • [4] Savic´ A, Ðurišic´ Z. Optimal sizing and location of SVC devices for improvement of voltage profile in distribution network with dispersed photovoltaic and wind power plants. Appl Energy 2014;134:114-24.
    • [5] Kabir MN, Mishra Y, Ledwich G, Xu Z, Bansal RC. Improving voltage profile of residential distribution systems using rooftop PVs and Battery Energy Storage systems. Appl Energy 2014;134:290-300.
    • [6] Carvalho PMS, Correia PF, Ferreira LAFM. Distributed reactive power generation control for voltage rise mitigation in distribution networks. IEEE Trans Power Syst 2008;23(2):766-72.
    • [7] Tonkoski R, Lopes LAC, El-Fouly THM. Coordinated active power curtailment of grid connected PV inverters for overvoltage prevention. IEEE Trans Sustain Energy 2011;2(2):139-47.
    • [8] Dorostkar-Ghamsari MR, Fotuhi-Firuzabad M, Lehtonen M, Safdarian A. Value of distribution network reconfiguration in presence of renewable energy resources. IEEE Trans Power Syst 2016;31(3):1879-88.
    • [9] Bernardon DP, Mello APC, Pfitscher LL, Canha LN, Abaide AR, Ferreira AAB. Real-time reconfiguration of distribution network with distributed generation. Elect Power Syst Res 2014;107:59-67.
    • [10] Capitanescu F, Ochoa LF, Margossian H, Hatziargyriou ND. Assessing the potential of network reconfiguration to improve distributed generation hosting capacity in active distribution systems. IEEE Trans Power Syst 2015;30(1):346-56.
    • [11] Flottemesch J, Rother M. Optimized energy exchange in primary distribution networks with DC links. Proceedings of Electric Utility DRPT 2004, Hong Kong, China, vol. 1. p. 108-16.
    • [12] Tang CY, Chen YF, Chen YM, Chang YR. DC-link voltage control strategy for three-phase back-to-back active power conditioners. IEEE Trans Indust Electron 2015;62(10):6306-16.
    • [13] Romero-Ramos E, Gómez-Expósito A, Marano-Marcolini A, Maza-Ortega JM, Martinez-Ramos JL. Assessing the loadability of active distribution networks in the presence of DC controllable links. IET Gener Transm Distrib 2011;5 (11):1105-13.
    • [14] Maza-Ortega JM, Gómez-Expósito A, Barragán-Villarejo M, Romero-Ramos E, Marano-Marcolini A. Voltage source converter-based topologies to further integrate renewable energy sources in distribution systems. IET Renew Power Gener 2012;6(6):435-45.
    • [15] Cao W, Wu J, Jenkins N. Feeder load balancing in MV distribution networks using soft normally-open points. In: 2014 IEEE PES ISGT-Europe, Istanbul, Turkey. p. 1-6.
    • [16] Bloemink JM, Green TC. Benefits of distribution-level power electronics for supporting distributed generation growth. IEEE Trans Power Del 2013;28 (2):911-9.
    • [17] Cao W, Wu J, Jenkins N, Wang C, Green T. Benefits analysis of Soft Open Points for electrical distribution network operation. Appl Energy 2016;165:36-47.
    • [18] Western Power Distribution. Low Carbon Networks Fund submission from Western Power Distribution - Network Equilibrium Available ; 2016.
    • [19] SP Energy Networks. Electricity NIC submission: SP Energy Networks - ANGLE-DC Available ; 2016.
    • [20] UK Power Networks. Flexible Urban Networks - Low Voltage (FUN LV) Available ; 2016.
    • [21] Kalantar M, Mousavi SM. Dynamic behavior of a stand-alone hybrid power generation system of wind turbine, microturbine, solar array and battery storage. Appl Energy 2010;87:3051-64.
    • [22] Trujillo CL, Velasco D, Guarnizo JG, Díaz N. Design and implementation of a VSC for interconnection with power grids, using the method of identification the system through state space for the calculation of controllers. Appl Energy 2011;88:3169-75.
    • [23] Georgiev D et al. Computing intervals of secure power injection. IFAC Proc 2014;47(3):2253-9.
    • [24] Vor P et al. Modular algorithms for computing Intervals of Secure Power Injection. In: 2016 IEEE international energy conference (ENERGYCON).
    • [25] Jones PS, Davidson CC. Calculation of power losses for MMC-based VSC HVDC stations. In: 2013 15th European Conference on Power Electronics and Applications (EPE), Lille. p. 1-10.
    • [26] Cao W, Wu J, Jenkins N, Wang C, Green T. Operating principle of Soft Open Points for electrical distribution network operation. Appl Energy 2016;164:245-57.
    • [27] Mutale J, Strbac G, Curcic C, Jenkins N. Allocation of losses in distribution systems with embedded generation. IEE Proc Gener Transm Distrib 2000;147 (1):7-14.
    • [28] Farag HEZ, El-Saadany EF. A novel cooperative protocol for distributed voltage control in active distribution systems. IEEE Trans Power Syst 2013;28 (2):1645-56.
    • [29] DTI Centre for Distributed Generation and Sustainable Electrical Energy. United Kingdom Generic Distribution System Phase One, March 2006. Available .
    • [30] Masters CL. Voltage rise: the big issue when connecting embedded generation to long 11 kV overhead lines. Power Eng J 2002;16(1):5-12.
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