PSCAD/EMTDC^TM Related References

1988

1. S.Nyati, S.R.Atmuri, D.Gordon, V.Koschik and R.M.Mathur, "Comparison of Voltage Control Devices at HVDC Converter Stations Connected to Weak AC Systems", IEEE Transactions on Power Delivery, Vol. 3, No. 2, April 1988, pp. 684-693.

   Abstract:  The control of ac voltage at the commutating bus following a disturbance is required for satisfactory operation of converters connected to weak ac systems.  In the past, the synchronous compensator has been exclusively used as a voltage control device (VCD).  However, recently a number of static VCDs have been proposed/applied to replace or supplement it.  The paper investigates and compares a digitally simulated performance and estimated cost of a number of these VCDs, including a novel scheme using a series capacitor, and outlines the merits and demerits of each of them.

2. J.Reeve and R.Adapa, "A New Approach to Dynamic Analysis of AC Networks Incorporating Detailed Modeling of DC Systems. Part I: Principles and Implementation", IEEE Transactions on Power Delivery, Vol. 3, No. 4, October 1988, pp. 2005-2011.

   Abstract:  A new digital simulator permits the integration of an ac transient stability program with a detailed simulation of a dc system.  It provides a means of overcoming limitations of current ac studies for which discontinuous and distorted interaction with dc networks are not accurately predicted.  Also, the response of the dc network takes into account the dynamics of a large system without the compromises of severe network reduction. A departure from previous practice extends the locations for interfacing the simulations away from the converter buses and multiple interfaces are accommodated.  The interfacing methods and scheduling are described.  A simple test example is provided.

3. G. Irwin, D.A. Woodford, "Modelling Surge Arresters in DC Converter Stations", CEA Spring Meeting, March, Montreal, 1988.

   Abstract:  Many protection schemes of AC and DC systems rely heavily on surge arresters to prevent harmful overvoltages.  It is therefore imperative to have accurate and flexible surge arrester models available for use in temporary overvoltage (TOV) or steep front insulation coordination studies.  This paper will examine some modelling techniques suitable for use in digital simulators.  These same techniques are currently being applied in a CEA research project entitled 'Performance of Metal Oxide Gapless Surge Arresters for HVDC Systems', (CEA project #214 T 565).

4. S.Nyati, S.R.Atmuri, D.L.Gordon and V.Koschik, "Metal Oxide Varistor to Limit Dynamic Overvoltages at the Terminals of an HVDC Converter", IEEE Transactions on Power Delivery, Vol 3, No. 2, April 1988, pp. 819-827.

   Abstract:  Metal oxide surge arrestors are now being widely applied to limit switching and lightning surges, but their application to limit dynamic overvoltages (DOV) is a recent development.  This paper investigates technical and economic implications associated with using metal oxide surge arrestor technology together with mechanically-switched shunt capacitors to limit DOV and provide reactive power at the inverter bus of a test system characterized by low short circuit ratio.  A conceptual design of a metal oxide varistor (MOV), that utilizes parallel metal oxide surge arrestor columns in combination with a switching device and controls is proposed.  Its cost, as well as that of the shunt capacitors, is estimated.  It is demonstrated that a combination of MOV and shunt capacitors is an effective and potentially very economic means of limiting DOV and providing reactive power compensation at the terminals of HVDC converters.