Effects of a variable parameter controller on the dynamic performance of an HVDC transmission system
TL;DR: In this article, an improved controller, the variable parameter controller, is suggested, where the controller gain and parameters are varied depending upon the rate of change of the direct current and the voltage.
About: This article is published in Electric Power Systems Research.The article was published on 1991-07-01. It has received 2 citations till now. The article focuses on the topics: Open-loop controller & Control theory.
Citations
More filters
TL;DR: In this paper, a Kalman filter-based control scheme is proposed to improve the dynamic performance of a parallel AC/DC transmission system, which is based on proportional-integral (PI) feedback control of thyristor firing angles in the DC/AC converters using KF estimates of system parameters as inputs.
7 citations
TL;DR: In this article, a controller with self-coordinating adaptive capability is proposed for HVDC systems, which is tested at a very low SCR, the most critical value for system performance evaluation, and at low inertia of the AC system.
5 citations
References
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TL;DR: In this paper, the adaptive tuning of the critical converter control system parameters in function of an estimate of the net commutation resistances is proposed to improve the dc system dynamic response.
Abstract: The transient performance of High Voltage Direct Current (HVdc) power transmission systems depends heavily on the current regulators associated to the converter control systems. The tuning of these current regulators is a function of the converters short-circuit ratio, or equivalently of all the net converter commutation resistances. These resistances vary with the network operating conditions and they are affected by AC system contingencies. This paper concerns the adaptive tuning of the critical converter control system parameters in function of an estimate of the net commutation resistances. Compared to regulators with constant gains, the proposed control and estimation algorithms improve the dc system dynamic response. This is demonstrated by a computer simulation of a typical HVdc system.
36 citations
TL;DR: In this paper, the feasibility of using an online method to coordinate the dc injections of a multiterminal dc system to dynamically control the power flows in certain ac lines of an integrated ac-dc power system was investigated.
Abstract: As more dc terminals, in the form of links or multiterminal systems, come into operation, the opportunity for controlling ac line flows using the injected dc powers increases. This paper describes a study undertaken to determine the feasibility of using an on-line method to coordinate the dc injections of a multiterminal dc system to dynamically control the power flows in certain ac lines of an integrated ac-dc power system. The proposed controller can be used to steer and to regulate the power flows, and also to damp the power oscillations in these ac lines. The effectiveness of the controller is demonstrated using a transient simulation program.
14 citations
TL;DR: This paper is a contribution to the improvement of transient stability of parallel ac-dc power systems by use of the optimal switching control.
Abstract: This paper is a contribution to the improvement of transient stability of parallel ac-dc power systems by use of the optimal switching control.
13 citations