摘要:

A method is presented for the accurate simulation of the hydraulic and mechanical aspects of a hydroelectric power-generating system. The representation is suitable for incorporation into an overall power-system model. In the development of the detailed model, the hydraulic equations are solved by the method of characteristics, and the hydromachine is represented by its performance curves. Linear turbine transfer functions are subsequently derived from the detailed model using the method of fast Fourier transforms. Comparisons are made between the formulations, and these show that the range of applicability of the approximate linear models is limited. Representative results from two practical systems are collected together to illustrate the use of the models in power-system studies.

DOI:10.1049/ip-c.1983.0001

出版商:IEE    

年代:1983

数据来源: IET

摘要:

A digital computer method is presented for the accurated evaluation of temporary overvoltage transients on a series-compensated transmission line. The synchronous generator is represented by a five-coil dynamic model, and the effect of the excitation control system associated with the generator is included in the analysis. The transmission network is represented by differential equations involving the network state variables. This kind of study is essential in choosing economical voltage ratings for surge arresters protecting high-voltage station equipment, in view of the modern practice of allowing surge diverters to reseal after temporary overvoltages exceeding their voltage ratings for a limited duration of time. These studies, when conducted for the case of series-compensated transmission lines, can reveal the limit of compensation level beyond which the danger of self-excited oscillation can occur in a particular system.

DOI:10.1049/ip-c.1983.0002

出版商:IEE    

年代:1983

数据来源: IET

摘要:

Development of a space charge model to represent corona from first principles is presented. The method is compared with experimental charge/voltage diagrams available in the literature and the model is reduced to more manageable terms for switching and lightning surge purposes. This simpler model, which has not been previously suggested, is also compared with experiment.

DOI:10.1049/ip-c.1983.0003

出版商:IEE    

年代:1983

数据来源: IET

摘要:

The paper presents a fault-location method which is insensitive to current-transformer saturation. The method requires less than one cycle of recorded fault data, which do not need filtering. A parameter estimation technique is applied where the linear part of the reference model response is described by instantaneous symmetrical components and the nonlinear part, caused by transformer saturation, described by phase variables. The parameters identified by the estimator are fault distance, fault resistance and saturation parameters. Accuracy is demonstrated by digital simulation studies.

DOI:10.1049/ip-c.1983.0004

出版商:IEE    

年代:1983

数据来源: IET

摘要:

Several utilities in the Mid-Continent Area Power Pool (MAPP) have planned to build the MANDAN Project, a proposed series-capacitor compensated 500 kV AC transmission international interconnection to be run from the Dorsey Substation near Winnipeg. Manitoba, Canada, to the Hoskins substation near Norfolk, Nebraska, United States, with intermediate taps in the United States in North Dakota near Valley City and in South Dakota near Huron. The MANDAN project will be the first application of series-capacitor compensation in the eastern United States. The paper describes the results of a frequency-scan study conducted to investigate subsynchronous resonance (SSR) and potential torsional interaction problems associated with 35 turbine-generator units located at 27 generating plants existing and projected in the area traversed by the MANDAN project. Provided in the paper is a description of the frequency-scan technique and its use in analysis of SSR problems, network model used, system and machine data required, MANDAN line simulation, and study methodology and case list developed particularly for the MANDAN SSR study. This information should be of great interest to utility planners and engineers studying the SSR problem on other series-compensated systems.

DOI:10.1049/ip-c.1983.0005

出版商:IEE    

年代:1983

数据来源: IET

摘要:

The paper presents a discussion on some of the engineering studies performed to determine the design parameters of the Itaipu convertor stations. The following studies are discussed: steady-state conditions, reactive-power compensation, insulation co-ordination and arrester protective scheme, current stresses, system stability, main characteristics of the master control, AC and DC filter and DC line resonance. For each of these study areas, the paper gives a summary of the study methodology used, indicates the main study results, and includes some of the system problems encountered and the solution adopted.

DOI:10.1049/ip-c.1983.0006

出版商:IEE    

年代:1983

数据来源: IET

摘要:

A description is given of the general arrangement of the overall feeder protection systems used by the CEGB. It is shown how this arrangement is only designed to accommodate protection relay failure when this failure leads to nonoperation under power-system fault conditions. The increasing importance of ensuring relay failures do not cause incorrect tripping is highlighted and existing methods of preventing this are discussed. A new approach to overcome this problem is described; that of computerised maintenance testing. A computerised protection test set specificaly developed for this purpose is described. Details are given of the hardware, software and mode of operation of the equipment, and test results produced by it are used to demonstrate the tests which the equipment can perform.

DOI:10.1049/ip-c.1983.0007

出版商:IEE    

年代:1983

数据来源: IET