New approaches for the analysis and control of multiterminal ac-dc networks. Final report
Main objective was to explore techniques and develop analytical tools for utilizing the inherent controllability of multiterminal hvdc transmission to enhance the performance of an integrated ac/dc power system. The final report consists of eight major sections. The first four sections pertain to steady-state operation of ac/dc systems, the last four sections are concerned with multiterminal power modulation. Section I presents a novel technique for solving the general load-flow problem for a multiterminal dc network in an integrated ac/dc system. Section II describes a new simplified dc load-flow algorithm for analysis of integrated ac/dc systems. In Section III an algorithm is developed to optimize the steady-state operation of a series-connected multiterminal hvdc system relative to real power losses. Section IV describes a method for coordinating the power transfers of a multiterminal dc system to control line flows in an ac network. Sections V and VI explore the advantages of centralized coordination of multiterminal power modulation. The study reported in Section VII applies a new decentralized eigenvalue assignment technique to the multiterminal hvdc modulation problem. The investigation described in Section VIII evaluates the effectiveness of two different forms of modulation for series-connected multiterminal hvdc systems: (1) a totally decentralized (uncoordinated) voltage modulation scheme, and (2) a centrally coordinated modulation technique using a supervisory program similar to that developed in Section V for the parallel system. A computer simulation of a four-terminal, three-machine power system was used to compare the performance of the two control techniques.
- Research Organization:
- Purdue Univ., Lafayette, IN (USA). School of Electrical Engineering
- DOE Contract Number:
- AS01-78CE30685
- OSTI ID:
- 5388407
- Report Number(s):
- DOE/CE/30685-2; ON: DE84005505
- Resource Relation:
- Other Information: Microfiche only, copy does not permit paper copy reproduction. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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