Distributed Voltage Controller with Autonomous Range Adjustment
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Solution Overview
Problem
The existing power distribution systems face challenges in maintaining stable voltage control due to non-uniform load distribution and rapid voltage fluctuations, especially with the integration of dispersed power systems like photovoltaic power generation, which requires centralized voltage control mechanisms that are costly and complex to implement and maintain.
Innovation Solution
A voltage controller system that allows autonomous and cooperative voltage control among multiple voltage controllers through communication, without the need for a centralized apparatus, by adjusting the target voltage range based on real-time voltage measurements and requests from connected power distribution lines, preventing hunting phenomena and ensuring stable voltage control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a centralized voltage controller is implemented to manage voltage across the entire power distribution system, then voltage control accuracy and system-wide voltage stability are improved, but device complexity and operational costs increase significantly
Solution Approach 1:
The power distribution system is divided into multiple independent voltage control regions, each managed by a local voltage controller. Each controller autonomously manages voltage within its own region by coordinating only with directly adjacent controllers, rather than requiring a single centralized controller to manage the entire system. This segmentation reduces overall system complexity while maintaining voltage control accuracy through distributed decision-making.
Solution Approach 2:
Each voltage controller is equipped with autonomous decision-making capabilities to handle voltage control decisions locally within its own region. The controllers adapt their control strategies based on local voltage conditions and coordinate with neighboring controllers only when necessary, rather than relying on centralized control for all decisions. This local autonomy reduces communication requirements and system complexity while maintaining reliable voltage control.
2Reliability
If a centralized voltage controller with high-speed communication network is deployed to coordinate multiple voltage controllers, then voltage stability during rapid fluctuations is improved, but installation and maintenance costs increase
Solution Approach 1:
The communication architecture is segmented into localized exchanges between adjacent voltage controllers rather than a centralized high-speed communication network. Each controller communicates only with its immediate neighbors to coordinate voltage control actions, reducing the need for expensive high-speed communication infrastructure while maintaining voltage stability through localized coordination.
Solution Approach 2:
Each voltage controller autonomously determines its own control actions based on local voltage measurements and coordination with neighboring controllers. The controllers independently make decisions about voltage adjustments without requiring complex centralized control algorithms, reducing the need for expensive high-speed communication networks and centralized processing capabilities.
3Speed
If the target voltage range is adjusted rapidly in response to voltage deviations, then voltage control responsiveness is improved, but hunting phenomena occur causing unstable voltage control
Solution Approach 1:
Adjacent voltage controllers perform preliminary coordination checks before implementing target voltage range adjustments. When one controller considers changing its target voltage range, it first communicates with neighboring controllers to assess whether the proposed change would cause hunting phenomena. This preliminary anti-action prevents unstable voltage control by anticipating and avoiding conflicting control actions before they occur.
Solution Approach 2:
Voltage controllers continuously exchange information with neighboring controllers about their target voltage range settings and voltage conditions. This feedback mechanism allows controllers to detect when adjacent controllers are making opposing adjustments that could cause hunting phenomena, and to adjust their own control actions accordingly to maintain stable voltage control while remaining responsive to voltage deviations.
4Reliability
If reactive-power-adjusting-type voltage control devices are used to cope with large voltage fluctuations, then voltage fluctuation absorption capability is improved, but device capacity and installation space requirements increase
Solution Approach 1:
Multiple voltage controllers with moderate capacity are distributed across the power distribution system, each managing voltage control within its own region. By merging the capabilities of these distributed controllers, the system achieves the ability to handle large voltage fluctuations that would otherwise require a single large-capacity device, while reducing the installation space required at any single location.
Solution Approach 2:
The voltage fluctuation absorption capability is segmented across multiple distributed voltage controllers rather than concentrated in a single large-capacity device. Each controller handles a portion of the total voltage control load, allowing the system to achieve high voltage fluctuation absorption capability while using smaller, more space-efficient devices distributed throughout the power distribution system.
Data Source
AI summary
A voltage controller includes: a voltage adjusting unit that controls a voltage controller that changes a voltage of a bus, to which a plurality of power distribution lines are connected, such that the voltage of the bus is within a target voltage range; a communication processing unit that communicates with a voltage controller that controls a voltage control device connected to the power distribution line or a voltage monitoring device that is installed on the power distribution line to measure the voltage at an installation site; a target-voltage-range change request processing unit that transmits a change-possibility confirmation for inquiring about whether the target voltage range can be changed to the voltage monitoring device connected to another power distribution line, via the communication processing unit, and determines whether to change the target voltage range according to a response to the change-possibility confirmation.


