Power Analysis of Hvdc Cigre Benchmark System
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Power Analysis of CIGRE HVDC Benchmark System Rectifier Station
Haroon Rashid, M.Eng Student, University of Toronto, Department of Electrical and Computer Engineering, ECE 1055 – 2013 – Assignment #1
Abstract—This assignment is based on the CIGRE HVDC benchmark system and deals with understanding and simulating this system in PSCAD/EMTDC. The focus is on the rectifier station of the CIGRE system which has been idealized and simulated in PSCAD. The AC-side real and reactive power and DC-side power corresponding to the firing angle from 0 to 180 degrees has been calculated and plotted. Furthermore, the power balance between the AC and DC-side of the converter has been explained. Index Terms— Converter, EMTDC, HVDC, PSCAD, Real power, Reactive power
considering a large inductor as load on the converter dc side so that the current remains unidirectional and constant. The 12 pulse converter in the system has been designed by connecting two 6-pulse Graetz bridge blocks in series. The two transformers are modeled as one with grounded Wye-Wye connection and the other with grounded Wye-Delta connection. This connection causes a 300 phase shift between the two 6-pulse converters. However, the current in the two converters remains the same since they are in series. III. TECHNICAL WORK PREPARATION A. Electrical Network
I. NOMENCLATURE ea, eb, ec – Line Voltages vd – Instantaneous voltage Vd – Average voltage ELN – Line to Neutral voltage rms voltage ia, ib, ic – Line currents ILN – Line rms current Id – DC-side current α – Firing angle PAC – AC real power PDC – DC power QAC – AC reactive power
Fig. 1. CIGRE HVDC Rectifier Station [2] in PSCAD
II. INTRODUCTION
T
HE CIGRE HVDC Benchmark system is the first benchmark model developed for studies of different HVDC control strategies. It provides a reference case for testing of simulators and digital programs. The system is a mono-polar 500kV, 1000-MW HVDC link with 12 pulse converters on both rectifier and inverter
Power Analysis of CIGRE HVDC Benchmark System Rectifier Station
Haroon Rashid, M.Eng Student, University of Toronto, Department of Electrical and Computer Engineering, ECE 1055 – 2013 – Assignment #1
Abstract—This assignment is based on the CIGRE HVDC benchmark system and deals with understanding and simulating this system in PSCAD/EMTDC. The focus is on the rectifier station of the CIGRE system which has been idealized and simulated in PSCAD. The AC-side real and reactive power and DC-side power corresponding to the firing angle from 0 to 180 degrees has been calculated and plotted. Furthermore, the power balance between the AC and DC-side of the converter has been explained. Index Terms— Converter, EMTDC, HVDC, PSCAD, Real power, Reactive power
considering a large inductor as load on the converter dc side so that the current remains unidirectional and constant. The 12 pulse converter in the system has been designed by connecting two 6-pulse Graetz bridge blocks in series. The two transformers are modeled as one with grounded Wye-Wye connection and the other with grounded Wye-Delta connection. This connection causes a 300 phase shift between the two 6-pulse converters. However, the current in the two converters remains the same since they are in series. III. TECHNICAL WORK PREPARATION A. Electrical Network
I. NOMENCLATURE ea, eb, ec – Line Voltages vd – Instantaneous voltage Vd – Average voltage ELN – Line to Neutral voltage rms voltage ia, ib, ic – Line currents ILN – Line rms current Id – DC-side current α – Firing angle PAC – AC real power PDC – DC power QAC – AC reactive power
Fig. 1. CIGRE HVDC Rectifier Station [2] in PSCAD
II. INTRODUCTION
T
HE CIGRE HVDC Benchmark system is the first benchmark model developed for studies of different HVDC control strategies. It provides a reference case for testing of simulators and digital programs. The system is a mono-polar 500kV, 1000-MW HVDC link with 12 pulse converters on both rectifier and inverter
References: Periodicals: [1] [2] M. Szechtman, T. Wess, and C. V. Thio, "First Benchmark Model for HVDC Control Studies," Electra, No. 135, April 1991. M. O. Faruque, Y. Zhang, and V. Dinavahi, "Detailed Modeling of CIGRE HVDV Benchmark System using PSCAD/EMTDC and PSB/SIMULINK," IEEE Trans. Power Delivery, vol. 21, no.1, pp. 378387, Jan. 2006 V. K. Soodh, V. Khatri, and H. Jin, " EMTP modelling of CIGRE benchmark based HVDC transmission system operating with weak AC systems," Power Electronics, Drives and Energy Systems for Industrial Growth, 1996., Proceedings of the 1996 International Conference on , vol.1, no., pp.426-432 vol.1, 8-11 Jan 1996. [3] Fig. 23. Instantaneous DC Power α = 0° 7 Books: [4] [5] J.D. Glover, M.S. Sarma, T.J. Overbye, Power System Analysis and Design, 4th ed., Connecticut: Cenage Learning, 2008. J. Arrillaga, Direct Current Transmission, 2nd ed., United Kingdom: The Institution of Electrical Engineers, 1998.