Pumped Storage Engine Pumping Start Test Control Method
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Solution Overview
Problem
The existing pumping start test methods for variable-speed pumped storage engines fail to coordinate the speed and guide vane opening rates effectively, leading to engine vibrations, shaft eccentricity, and potential stator-rotor contact, compromising safety and stability during the test.
Innovation Solution
A method and device that control the pumping start of a pumped storage engine through multiple stages, adjusting speed and obtaining parameters to ensure the speed rise matches the guide vane opening, using modules to determine test results and avoid engine vibrations and contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the speed rising rate is increased to improve startup speed, then the pumping start speed is improved, but the guide vane opening cannot keep up, causing large shaft eccentricity and potential stator-rotor contact
Solution Approach 1:
The pumping start process is divided into three distinct stages: first stage (0-30% rated speed), second stage (30-70% rated speed), and third stage (70-100% rated speed). Each stage has independently controlled speed rising rates and guide vane opening rates, allowing coordinated control to prevent shaft eccentricity and stator-rotor contact while achieving rapid startup.
Solution Approach 2:
The control system dynamically adjusts the speed rising rate and guide vane opening rate based on the current operating stage. In the first stage, the speed rising rate is set to 3-8% per second; in the second stage, it is set to 1-3% per second; and in the third stage, it is set to 0.5-2% per second. This dynamic adjustment ensures coordination between speed and guide vane opening at all times.
2Power
If the guide vane opening rate is increased to improve pump power, then the pump power is improved, but the speed cannot keep up, causing large shaft eccentricity and vibration
Solution Approach 1:
The guide vane opening process is segmented into three stages corresponding to three speed stages. In the first stage, the guide vane opening rate is controlled at 0.5-2% per second; in the second stage, it is controlled at 0.3-1.5% per second; and in the third stage, it is controlled at 0.2-1% per second. This segmentation ensures that guide vane opening never exceeds the speed increase capability, preventing shaft eccentricity and vibration.
Solution Approach 2:
The control system continuously monitors the actual speed and guide vane opening position, comparing them against the target values for each stage. Based on this feedback, the system dynamically adjusts the opening rate and speed rising rate to maintain coordination, preventing shaft eccentricity and ensuring stable operation.
3Device complexity
If a single-stage control method is used to simplify the control process, then the control complexity is reduced, but the coordination between speed and guide vane opening cannot be ensured, leading to vibration and instability
Solution Approach 1:
The control process is segmented into three stages with distinct control strategies: first stage focuses on rapid acceleration with coordinated guide vane opening; second stage focuses on moderate acceleration with proportional guide vane opening; third stage focuses on fine-tuning speed and opening for stable operation. This segmentation enables precise coordination while maintaining manageable control complexity through standardized procedures for each stage.
Data Source
AI summary
A method and device for a pumping start test for a pumped storage engine, and an apparatus are disclosed. The method includes: obtaining a switch state of guide vanes of the pumped storage engine; controlling the pumping start of the engine to enter a first stage according to the switch state of the guide vanes, and obtaining parameters related to the first stage, to determine a first-stage test result; controlling the pumping start of the engine to enter a second stage according to the first-stage test result, and obtaining parameters related to the second stage, to determine a second-stage test result; controlling the pumping start of the engine to enter a third stage according to the second-stage test result, and obtaining parameters related to the third stage to determine a final test result. The first stage, the second stage and the third stage correspond to different speeds of the engine.