Autonomous Reactive Power Control for Distribution Networks
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Solution Overview
Problem
Existing electricity distribution networks face challenges in managing reactive power flow efficiently, leading to increased energy losses, economic burdens, and environmental impacts due to phase differences between current and voltage, which conventional methods struggle to address effectively, especially at localized levels within the network.
Innovation Solution
A reactive power control device that detects local reactive power characteristics and autonomously adjusts its contribution to the network, using control means to drive the reactive power towards a predetermined optimum value, thereby providing real-time compensation without central control, and can switch between capacitive and inductive modes to correct phase differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If reactive power compensation is implemented at large scale power providers, then the reactive power contribution is reduced, but the compensation is effective only at short distances and does not address localized phase differences
Solution Approach 1:
The patent divides the reactive power compensation function into distributed segments across multiple power devices in the network. Each power device independently performs reactive power compensation at its local location, rather than relying on centralized compensation at large scale power providers. This segmentation enables localized adaptation to phase differences at different network positions.
Solution Approach 2:
The patent implements reactive power compensation with local quality by enabling each power device to detect and compensate for phase differences specific to its local network position. The compensation characteristics are tailored to local conditions rather than applying a uniform centralized approach, ensuring that each location receives appropriate compensation for its specific phase difference issues.
2Loss of energy
If the current-voltage phase difference is reduced through centralized reactive power compensation, then the total current supplied is reduced, but the phase difference varies significantly from location to location making centralized compensation ineffective
Solution Approach 1:
The patent implements self-service reactive power compensation where each power device autonomously detects the phase difference at its own location and adjusts its reactive power contribution accordingly. The control means in each device automatically regulates the reactive power without requiring external control signals, enabling each device to serve itself and adapt to local conditions precisely.
3Ease of operation
If reactive power is compensated at transformer stations, then the reactive power flow is managed at a central point, but this does not address the varying phase differences at different network locations
Solution Approach 1:
The patent segments the reactive power compensation function from centralized transformer stations to distributed power devices throughout the network. Each power device becomes an independent compensation unit that operates autonomously based on local phase difference conditions, eliminating the need for complex centralized control while improving location-specific adaptability.
Data Source
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AI summary
Embodiments of the invention relate to devices and methods and systems for controlling a reactive power contribution to reactive power flowing in an electricity distribution network, so as to optimise this reactive power flow. Conventional methods of controlling reactive power flow focus on minimising a reactive power contribution by power provision and power consumption devices connected to the electricity distribution network, in accordance with, for example, regulations governing a maximum allowed power factor and/or under the control of a central controlling entity. However, such methods are slow to react to changing network conditions, and do not take account of local variations in reactive power. In an embodiment of the present invention, there is provided a reactive power control device for use with a power consumption and/or provision device. The reactive power control device comprises detecting means for detecting, at the power device, a reactive power characteristic of electrical power flowing in the electric power distribution network, the reactive power characteristic relating to a reactive power component of electricity flowing in the network. The reactive power control device further comprises control means for controlling, on the basis of the detected reactive power characteristic, a reactive power contribution to the electricity distribution network so as to adjust a value of the detected reactive power characteristic. This enables individual power consumption and/or provision devices to react autonomously to local variations in the electricity distribution network,and to provide a reactive power contribution, to drive the detected reactive power characteristic towards a desired value.