Central Bus Voltage Control via Dynamic Reactive Power Optimization
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Solution Overview
Problem
Conventional voltage control methods in power systems are limited by slow response speeds, which can lead to instability and significant influences on voltage stability.
Innovation Solution
A voltage control method and apparatus that utilize a dynamic reactive power compensation device to participate in voltage control, implementing dynamic reactive power optimization by adjusting generator and dynamic reactive power compensation device settings based on predetermined and current voltage values, reactive power margins, and sensitivity matrices to achieve faster adjustments and improved reactive power reserve levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional voltage control methods are used, then the control system is simple, but the response speed is slow
Solution Approach 1:
The voltage control function is segmented into two distinct control modes: preventive control for normal operation and emergency control for abnormal conditions. This segmentation allows each control mode to be optimized independently - preventive control uses simple generator voltage adjustments, while emergency control activates the dynamic reactive power compensation device for fast response, thus improving overall response speed without unnecessarily complicating the normal operation mode.
Solution Approach 2:
The control system dynamically switches between preventive control and emergency control modes based on real-time voltage conditions. When voltage deviations exceed predetermined thresholds, the system transitions from the simple preventive control mode to the emergency control mode that utilizes the dynamic reactive power compensation device, enabling the system to adapt its complexity and response characteristics to actual operational needs.
2Speed
If dynamic reactive power compensation device is added for fast response, then the response speed improves, but the device complexity increases
Solution Approach 1:
The dynamic reactive power compensation device is pre-configured and ready for immediate action, but only activated when voltage deviations exceed predetermined thresholds. This preliminary preparation allows the system to maintain simplicity during normal operation while having the capability for rapid response when needed, thus improving response speed without permanently increasing system complexity.
Solution Approach 2:
The control system changes its operational parameters dynamically - during normal operation, it uses standard generator voltage control with simple parameters; when voltage instability is detected, it switches to emergency control mode where the dynamic reactive power compensation device is activated with adjusted parameters to provide fast response, thus achieving high response speed only when necessary.
3Reliability
If preventive control is implemented, then the voltage stability improves, but the control frequency increases
Solution Approach 1:
The control system implements periodic monitoring of voltage deviations and only activates preventive control actions when deviations exceed predetermined thresholds. This periodic check-act cycle ensures voltage stability is maintained through timely interventions without requiring continuous control actions, thus improving voltage stability while avoiding excessive control frequency that would reduce overall system efficiency.
Data Source
AI summary
A voltage control method and apparatus of a central bus in a power system are provided. The method comprises: S1: obtaining a predetermined voltage and a current voltage; S2: obtaining a first voltage adjustment of the generator and a second voltage adjustment of the dynamic reactive power compensation device; S3: sending the first voltage adjustment and the second voltage adjustment; S4: judging whether a current reactive power of the dynamic reactive power compensation device is between a first predetermined reactive power and a second predetermined reactive power; S5: if yes, obtaining a third voltage adjustment of the generator and a fourth voltage adjustment of the dynamic reactive power compensation device; S6: sending the third voltage adjustment and the fourth voltage adjustment; repeating steps S1-S7 after a predetermined period of time; S7: if no, repeating steps S1-S7 after the predetermined period of time.