# MW ranking technique in power system and its application in Hong Kong power network

 Author: Lam, Tim Chor Peter Title: MW ranking technique in power system and its application in Hong Kong power network Degree: M.Sc. Year: 1996 Subject: Electric power systemsElectric power distribution -- China -- Hong KongHong Kong Polytechnic University -- Dissertations Department: Multi-disciplinary Studies Pages: x, 82 p. : ill. ; 31 cm Language: English InnoPac Record: http://library.polyu.edu.hk/record=b1231329 URI: http://theses.lib.polyu.edu.hk/handle/200/5189 Abstract: Conventional contingency analysis utilized in assessing the steady-state security of a power system requires a large computational burden. A MW ranking method is then introduced to reduce the burden as well as to achieve the desirable result. This report summaries the theory and compares the accuracies and efficiencies of various MW ranking methods. The Hong Kong extra high tension power network will be tested in assuming primarily single line outage as well as a circuit tripped on fault contingency. The criteria of line flow problems are to be adopted to achieve the ranked lists of all the proposed contingencies. The effects of the higher values of the exponents and multipliers of the methods are also illustrated. Two computer programs are written to identify the overload circuit(s) under the condition of the double contingencies by using the first iterations of AC and DC load flow analyses. A flow chart in figure 2 is simple to show you the step-by-step procedures in obtaining the expected results. The procedures of the computatioal process are summarized and listed as below: 1. Input system parameters. 2. Build the bus admittance matrices. 3. Apply Newton-Raphson Method to the solutions of the first iterations of AC and DC power flow equations to compute the busbar voltage angles and magnitudes as well as the line currents. 4. Identify the overload circuit(s). 5. Achieve the ranked lists. 6. Compare the results to the 'reference ranking' which is achieved by the full AC load flow method. 7. Calculate the 'percentage filtering accuracy' and 'percentage ordering accuracy' in different modified performance indexes. 8. Compare the results and find out which method can give a better ranking. Various definitions of performance indices, either in linear or non-linear forms are to be tested with the change of the values of the exponents or the multipliers of the performance index . We conclude that the two terms performance index in linear expression can provide the best percentage overall effectiveness by using the first iteration of AC load flow method.

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