Voltage Adjustment Device Tap Control for Solar Distribution Systems
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Solution Overview
Problem
In distribution systems with solar power generation, the coordination between voltage adjustment devices (SVR) and static var compensators (SVC) is inadequate, leading to unnecessary operations and insufficient suppression of abrupt voltage fluctuations, as SVCs operate ahead of SVRs, resulting in potential failure to manage photovoltaic power generation output fluctuations.
Innovation Solution
A voltage adjustment device with a tap controller that estimates secondary voltage, corrects it based on SVC output, and adjusts the tap position to maintain voltage within limits, ensuring coordinated operation with SVCs, thereby reducing voltage deviations and enhancing operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a static var compensator SVC is installed on the end side of the distribution line to suppress voltage fluctuation, then the response speed for voltage control is improved, but the voltage adjustment device SVR fails to operate due to coordinated control failure
Solution Approach 1:
The control device performs preliminary assessment of whether SVR operation is necessary before the SVC acts, by estimating the secondary voltage of the SVR and comparing it with predetermined voltage limits. This preliminary action prevents unnecessary SVC operations and ensures coordinated control between the two devices.
Solution Approach 2:
A control device is introduced as an intermediary between the SVR and SVC to coordinate their operations. The control device receives output information from the SVC, estimates the SVR secondary voltage, and determines whether SVR tap change operation is necessary, thereby mediating the coordinated control between the two voltage control devices.
2Reliability
If the static var compensator SVC operates with maximum output continuously, then voltage fluctuation suppression capability is maintained, but the output margin for abrupt voltage fluctuation is reduced
Solution Approach 1:
The control device continuously monitors the output of the SVC and uses this feedback information to estimate the SVR secondary voltage. Based on this feedback, the control device determines whether SVR operation is necessary, allowing the SVC to operate with optimized output rather than continuous maximum output, thereby maintaining both reliability and adaptability.
Solution Approach 2:
The control device performs preliminary assessment of voltage conditions using estimated SVR secondary voltage before determining SVC operation levels. This preliminary action allows the SVC to operate at appropriate output levels rather than continuous maximum output, preserving output margin for handling abrupt voltage fluctuations while maintaining voltage control reliability.
3Ease of operation
If the voltage adjustment device SVR uses a machine mechanism for tap change, then the device operates with a response time constant of several tens of seconds, but unnecessary operations are increased when multiple devices are installed in series
Solution Approach 1:
The control device applies local quality control by estimating the secondary voltage specifically at the SVR location and determining tap change necessity based on local voltage conditions rather than system-wide conditions. This localized assessment prevents unnecessary SVR operations when multiple devices are installed in series, reducing unnecessary operations while maintaining appropriate response time.
4Power
If solar power generation devices are increased in the distribution system, then the power output capacity is improved, but abrupt voltage fluctuation occurs due to weather fluctuation
Solution Approach 1:
The control device acts as an intermediary that coordinates the operations of SVR and SVC in response to voltage fluctuations caused by solar power generation. By estimating the SVR secondary voltage and determining appropriate tap change timing, the control device enables both devices to work together effectively in suppressing abrupt voltage fluctuations while maintaining the benefits of increased solar power capacity.
Data Source
AI summary
A voltage adjustment device, a voltage adjusting method and a power control system for a distribution system are provided, in which the voltage adjustment device and a static var compensator are appropriately operated in a coordinated manner and the sustention of voltage and the enhancement of the operation efficiency are attained. A voltage adjustment device for a distribution system is installed in the distribution system including a static var compensator on an end side and controls a secondary voltage to be within a predetermined limit value by adjusting a tap position. The voltage adjustment device includes a first unit configured to estimate the secondary voltage; a second unit configured to obtain a corrected voltage by correcting the estimated secondary voltage by using a correction amount obtained from an output of the static var compensator; and a third unit configured to compare the corrected voltage with the predetermined limit value and operate the tap position when the corrected voltage deviates from the predetermined limit value.