FPGA Digital Valve Controller for Steam Turbine Bypass
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Solution Overview
Problem
Existing controller systems for steam turbine power plants are limited in their ability to process a large quantity of input signals quickly, operate in severe service environments, and are not suitable for installation in hazardous areas, often requiring lengthy scan times and being unsuitable for compact, explosion-proof, and waterproof configurations.
Innovation Solution
A deterministic digital controller assembly with a programmable logic controller (PLC) based on FPGA technology, capable of processing a large quantity of input and output signals, operating in harsh conditions, and packaged in a compact, explosion-proof, and waterproof container for direct mounting near valves, utilizing a PID controller and wireless communication for remote operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If prior art controllers are used to control turbine bypass systems, then basic control functions are provided, but the controllers have lengthy scan times that reduce reliability and efficiency
Solution Approach 1:
The patent replaces traditional mechanical/electronic controller architectures with a field-programmable gate array (FPGA) based deterministic digital controller. This substitution enables parallel processing of multiple input signals simultaneously, reducing scan time from seconds to milliseconds while improving reliability through deterministic timing and redundant processing paths.
Solution Approach 2:
The controller divides the control system into modular functional blocks including input signal processing modules, control algorithm modules, and output signal modules. Each module can be independently configured and processed in parallel, enabling rapid scanning of numerous sensors and actuators without increasing overall processing time.
2Ease of operation
If controllers are installed in control rooms, then centralized control is achieved, but multiple communication lines must be routed from controller to valves increasing complexity
Solution Approach 1:
The patent transitions from a two-dimensional control room installation to a three-dimensional distributed architecture where compact controller units can be mounted directly at valve locations or in nearby instrument cabinets. This spatial reconfiguration eliminates long communication lines while maintaining centralized supervisory control through wireless or local network connections.
3Adaptability or versatility
If controllers operate in severe service environments, then field installation near valves is enabled, but temperature range limitations restrict reliable operation
Solution Approach 1:
The patent introduces a hermetically sealed housing with thermal management systems as an intermediary between the controller electronics and the harsh external environment. The housing provides thermal isolation and protection from moisture, corrosion, and extreme temperatures, enabling reliable operation in field installations from -40°C to +85°C while maintaining electronic component integrity.
4Adaptability or versatility
If controllers are used in hazardous areas, then direct field control is achieved, but explosion-proof requirements increase device complexity
Solution Approach 1:
The patent creates an inherently safe design where the controller housing maintains an inert atmosphere through hermetic sealing and positive pressure ventilation with filtered air. This prevents explosive atmospheres from forming inside the enclosure, allowing the controller to be installed in hazardous areas classified as Zone 1 or Zone 2 without requiring complex explosion-proof certifications or intrinsically safe barriers.
Data Source
AI summary
A controller assembly is adapted for regulating at least one valve having a valve positioner. The controller assembly comprises a digital controller having a plurality of data inputs and data outputs and includes at least one proportional-integral-derivative (PID) controller operative to modulate the valve positioner in response to data received at the data inputs. The digital controller is configured to perform the following functions within a total time period of no greater than 10 ms: acquisition of data at the data inputs, processing of the data, and transmission of data from the data output in order to regulate the valve(s). The digital controller may include a quantity of at least sixteen digital inputs, at least sixteen digital outputs, at least eight analog inputs and at least eight analog outputs.