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Dual Configuration, Dual Setting, Digital Power System |
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B. A. (Brian) Archer, L. E. (Lorne) Midford, J. B. (Brett) Davies Manitoba Hydro |
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Abstract—This paper describes a digital power system stabilizer which can automatically switch between two different sets of settings and operate as an electric power input type and an integral-of-accelerating power input type. The requirements for such a stabilizer along with techniques to facilitate its implementation on two hydraulic units which are switchable between an isolated ac system feeding an HVdc double bipole and a parallel, relatively weak, 230 and 138 kV ac transmission system, is provided. Stabilizer tuning based on load modulation is presented. Results from eigenvalue analysis and dynamic stability studies demonstrate the effectiveness of this stabilizer in damping both inter-area and inter-plant electromechanical modes, as well as reducing the undesirable effects of low gate mechanical torque oscillations. |
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I. INTRODUCTION II. EIGENVALUE ANALYSIS III. TIME DOMAIN SIMULATIONS IV. STABILIZER CONSIDERATIONS １．The location from which the PSSs would be most effective in providing damping to inter-area and interplant modes thereby increasing power transfer limits in the area; ２．The PSS configuration which will be least de-stabilizing to low gate (rough region), low frequency forced mechanical torque oscillations common to low head hydraulic units, similar to those at Kettle and Kelsey; ３．If installed at Kettle G.S., a configuration which will satisfy requirements 1 and 2 and in addition, allow Kettle units 1&2 to respond in a similar manner to the remaining Kettle units, when all units are operating on the Collector system. Factors affecting the three requirements will be discussed briefly. A. Location of PSS V. PSS PARAMETER SELECTION (NORTHERN AC SYSTEM) VI. PSS PARAMETER SELECTION (COLLECTOR SYSTEM) When Kettle units 1 and 2 are operating on the isolated Collector system the speed input signal will be disabled, the gain Ks3 set to zero and the PSS will appear as shown in Fig. 12.…… VII. SIMULATIONS WITH PSSS IN SERVICE The eigenvalue analysis was repeated with both stabilizers in service on Kettle units 1 and 2 when the units were isolated onto the northern ac system.…… VIII. CONCLUSIONS Eigenvalue analysis and time domain studies are presented which show that when Kettle units 1 and 2 are switched to operate on Manitoba Hydro’s northern ac system, the addition of integral-of-accelerating power stabilizers will significantly improve damping to unstable inter-area and inter-plant modes of oscillation.…… |
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