|Title:||A comparative study of system indices versus load point indices for bulk power system|
|Subject:||China Light & Power Co., Ltd|
Electric power systems
Electric power systems -- Data processing
Hong Kong Polytechnic -- Dissertations
|Department:||Department of Electrical Engineering|
|Pages:||76 leaves : ill. ; 30 cm|
|Abstract:||In this project, a comprehensive study of the effect of contingency level, load level and generation reserve variations, and the effect of addition of transmission circuit on the adequacy indices, which include both individual load point indices and system indices, for the China Light & Power Co., Ltd. are carried out by developing a computer programme for the evaluation. The programming language used is C language. The individual load point indices include: 1. probability of failure, 2. frequency of failure, 3. annualized number of voltage violations, 4. annualized number of load curtailments, 5. annualized load curtailed, 6. annualized energy not supplied, and 7. annualized load curtailment duration. The system indices include: 1. bulk power interruption index, 2. bulk power supply average MW curtailment/disturbance, 3. bulk power energy curtailment index, and 4. modified bulk energy curtailment index. The indices, designated as annualized values, are calculated for a single load level (peak load) for the whole system and each bus, and are expressed on a base of one year. The quantitative evaluation of the adequacy of the CLP bulk power supply system is comprised of the following basic steps: 1. Evaluate the performance of the power system, by using fast decoupled load flow technique, without removing any component. 2. Make changes in the network configuration due to the outages of various components, including generators and transmission lines. Outages of up to three components are considered, except simultaneous outages of three transmission lines. 3. Check the adequacy of the modified power system by fast decoupled load flow. 4. Take corrective actions, if necessary, such as line overload alleviation by generation rescheduling and load shedding, correction of bus voltages to relieve generator MVAr overload etc. 5. Calculate the adequacy indices for the individual load points and the system as a whole. The above is repeated for 90% and 80% of the load levels. Generation reserve is also varied by adding and removing one 350MW unit to and from the system respectively. To compare the effectiveness of the network reinforcement schemes from the reliability point of view, and to study the application of the adequacy indices, five different system reinforcement schemes, each by adding one transmission circuit, are investigated. A fictitious system is employed by modifying the CLP system such that the bus loads are increased by 35% in each case.|
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