SVC Control Device Signal Processing Architecture
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Solution Overview
Problem
Existing SVC systems face difficulties in system configuration and error handling due to increasing types and numbers of databack signals, requiring significant time and manpower, especially under unstable conditions, and have limitations in simultaneous control of gate units and signal transmission.
Innovation Solution
A control device for SVCs that includes a monitoring control unit for generating error presence/absence signals, a valve signal processing unit for analyzing databack signals, a CPU control unit for generating state information signals, and a firing signal output control unit to facilitate efficient signal transmission and error correction, allowing direct firing signal transmission to valves without passing through the upper controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the existing system checks and controls valve state from firing signal start point with multiple databack signals, then measurement precision is improved, but device complexity increases significantly
Solution Approach 1:
The patent extracts the core essential signal (firing signal) from the complex multi-signal system and uses it as the primary reference point for all control operations. By taking out the firing signal as the central timing reference, the system eliminates the need for multiple separate databack signals while maintaining comprehensive valve state monitoring capability.
Solution Approach 2:
The firing signal serves multiple functions simultaneously: it acts as the control trigger, the timing reference for error checking, the synchronization point for gate unit control, and the basis for sequence coordination. This multi-functionality replaces what previously required multiple separate signaling systems.
2Reliability
If the system processes multiple databack signals from various valve conditions, then reliability is improved, but loss of time increases due to considerable time and manpower required for error handling
Solution Approach 1:
The system performs preliminary error checking by comparing the firing signal timing with expected valve response timing before full operation proceeds. This preliminary validation prevents erroneous operations and reduces the need for lengthy post-error diagnostic procedures, as potential issues are detected and addressed at the signal initiation stage.
Solution Approach 2:
The system implements feedback mechanisms where the firing signal generates expected response signals that are compared against actual valve responses. This closed-loop feedback enables automatic error detection and correction, reducing manual intervention time while maintaining high reliability in error detection.
3Stability of the object's composition
If the system uses a 16.67 ms period for firing signal control, then stability is improved, but productivity decreases due to limitations in simultaneously controlling gate units
Solution Approach 1:
The control system segments the gate unit control into independent parallel channels, each capable of receiving and processing firing signals simultaneously within the 16.67 ms period. This segmentation allows multiple gate units to be controlled concurrently rather than sequentially, maintaining the stable periodic timing while increasing overall control throughput and productivity.
4Reliability
If the system transmits control signals through upper controller C&P, then reliability is improved, but device complexity increases due to signal transmission complexity
Solution Approach 1:
The firing signal acts as an intermediary that carries multiple layers of control information in a standardized format through the upper controller C&P system. By encoding valve control commands, error checking requirements, and synchronization information within this single intermediary signal structure, the system maintains reliable transmission through existing robust infrastructure while reducing the complexity of managing multiple separate signal paths.
Data Source
AI summary
A control device for a static var compensator (SVC) includes: a monitoring control unit configured to generate an error presence/absence signal based on a control signal inputted from a system controller; a valve signal processing unit configured to generate a valve state signal based on databack signals respectively inputted from a plurality of valves; a CPU control unit configured to generate a state information signal based on the error presence/absence signal and the valve state signal; and a firing signal output control unit configured to generate a firing signal according to the state information signal.