Decentralized Voltage Control via Cooperative Sensor-Controller Network
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Solution Overview
Problem
The centralized voltage controller in power distribution systems requires high-speed communication networks and significant maintenance, making it costly and inefficient for widespread implementation, especially given the limited need for centralized voltage control in most systems.
Innovation Solution
A decentralized power-distribution-system voltage control system where multiple voltage control apparatuses communicate directly to manage voltage fluctuations without a centralized controller, using voltage sensors and controllers to adjust tap positions and reactive power outputs based on real-time voltage measurements and moving averages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a centralized voltage controller is used to collect voltage/current information from all points of the power distribution system, then voltage control accuracy is improved, but communication network complexity and cost increase
Solution Approach 1:
The centralized voltage controller is segmented into multiple distributed voltage controllers placed at different locations in the power distribution system. Each controller independently monitors local voltage conditions and executes control actions, eliminating the need for a complex centralized communication network while maintaining effective voltage control through decentralized operation
Solution Approach 2:
The control function is extracted from the centralized controller and distributed to multiple independent voltage controllers throughout the system. This allows local autonomous decision-making based on measured voltage conditions, removing the dependency on high-speed communication infrastructure while preserving control effectiveness
2Loss of information
If a centralized voltage controller is implemented, then system-wide voltage monitoring is improved, but maintenance cost and operational burden increase
Solution Approach 1:
The single centralized controller is divided into multiple smaller distributed controllers, each responsible for local voltage monitoring and control. This segmentation reduces the operational burden on any single device and eliminates the need for expensive centralized maintenance while ensuring continuous system-wide monitoring through coordinated local actions
Solution Approach 2:
Each distributed voltage controller independently performs its own monitoring and control functions based on local measurements, reducing dependency on centralized management and maintenance. The controllers autonomously adjust voltage levels according to pre-established control algorithms, minimizing operational intervention requirements
3Productivity
If multiple voltage control apparatuses operate cooperatively, then voltage fluctuation response capability is improved, but coordination complexity increases
Solution Approach 1:
Each distributed voltage controller continuously monitors local voltage conditions and automatically adjusts its output based on real-time feedback from voltage measurements. This feedback mechanism enables rapid response to voltage fluctuations without requiring complex inter-controller communication or coordination protocols, as each controller independently reacts to local conditions
Data Source
AI summary
A cooperative voltage sensor (CVS) issues a target voltage change request when a voltage moving average at an end thereof deviates from a proper voltage upper or lower limit value. A cooperative voltage controller (CVC) also can issue a target voltage change request when a voltage moving average at an end thereof deviates from the proper voltage upper or lower limit value. The target voltage change request issued by the cooperative voltage sensor (CVS) or the cooperative voltage controller (CVC) is transferred between cooperative voltage controllers (CVCs) via a communication network and notified to all the cooperative voltage controllers (CVCs), and a cooperative operation of voltage control is realized.