Unified active and reactive power modulation of HVDC transmission systems
Abstract
The power modulation of a high voltage direct current (HVDC) system for stabilization of an ac/dc network was investigated. It was found that simultaneous modulation of both dc current and voltage was more effective than just current modulation by itself, since the dc voltage modulation could be used to minimize the reactive power changes resulting from a change of the dc current. This helps stabilize the ac busbar voltages at the converters, which reduces undesirable load flow changes to voltage dependent ac loads, thus improving the effectiveness of the dc power modulation. This unified modulation control concept was evaluated by means of digital computer studies as well as a special purpose HVDC simulator. Several combined ac/dc power transmission systems were synthesized for testing of different modulation controller concepts. An optimum controller design incorporating a linear quadratic control algorithm with full state feedback was first studied. This provided a basis for comparison of suboptimal controller designs utilizing reduced state feedback and a Kalman filter state reconstruction technique.
- Publication:
-
Final Report General Electric Co
- Pub Date:
- November 1981
- Bibcode:
- 1981gec..rept.....G
- Keywords:
-
- Direct Current;
- Electric Power Transmission;
- High Voltages;
- Modulation;
- Power Conditioning;
- Computerized Simulation;
- Cost Effectiveness;
- Current Converters (Ac To Dc);
- Feedback Control;
- Kalman Filters;
- Optimal Control;
- Electronics and Electrical Engineering