Capacitor Bank Controller Automatic Sizing via Wireless Current Sensors
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Solution Overview
Problem
Existing capacitor bank control systems require cumbersome manual input of capacitor bank size during commissioning, which can lead to errors or incorrect installations, especially when operators are unaware of the size or input the incorrect size.
Innovation Solution
The system automatically determines the capacitor bank size using voltage and current measurements from wireless current sensors, employing techniques such as repeated measurements and filtering to ensure accuracy, and a communication scheme between the capacitor bank controller and wireless current sensors to account for energy limitations and rapid load changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual input of capacitor bank size is used during commissioning, then installation process is simple, but errors and incorrect installations occur
Solution Approach 1:
The capacitor bank controller automatically determines the capacitor bank size by measuring current before and after connection, eliminating the need for manual operator input. The system performs self-identification of the capacitor bank rating through wireless current sensors and automated calculations based on measured electrical parameters.
Solution Approach 2:
The manual mechanical process of operator input is replaced with an automated electronic measurement and calculation system. Wireless current sensors measure electrical current, and the controller automatically computes the capacitor bank size using the difference in current measurements before and after connection.
2Reliability
If automated determination using wireless current sensors is implemented, then accuracy and reliability improve, but system complexity increases
Solution Approach 1:
The wireless current sensors serve multiple functions: they measure current for capacitor bank size determination, provide ongoing power quality monitoring, and support various control algorithms. This multi-functionality reduces the need for separate dedicated measurement devices, thereby limiting the increase in overall system complexity.
Solution Approach 2:
The system utilizes changes in electrical current parameters before and after capacitor bank connection to determine the capacitor bank size. By measuring the difference in current magnitude and power factor changes, the system automatically identifies the capacitor bank rating without requiring additional complex hardware.
3Measurement precision
If repeated measurements and filtering techniques are used, then measurement precision improves, but time required for determination increases
Solution Approach 1:
The system performs repeated current measurements at periodic intervals during the capacitor bank connection process. Multiple measurements are taken and filtered to eliminate outliers and ensure accuracy, with the filtering process designed to converge quickly to the correct capacitor bank size value.
Data Source
AI summary
The present disclosure relates to a capacitor bank controller that automatically determines the size of a capacitor bank using wireless current sensors. The capacitor bank controller determines a first capacitor bank size estimate using voltage and current measurements from when the capacitor bank is open and when the capacitor bank is closed a first time. The capacitor bank controller determines a second capacitor bank size estimate by using voltage measurements and current measurements from when the capacitor bank is open and when the capacitor bank is closed a second time. The capacitor bank controller determines a filtered capacitor bank size estimate based on the first capacitor bank estimate and the second capacitor bank estimate and controls operation of the capacitor bank based on the filtered capacitor bank size estimate.