Pumped Storage Group Starting Control via Speed Curve Correction
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Solution Overview
Problem
Conventional starting methods for pumped storage groups result in unstable operating states due to large speed fluctuations and deviations from optimal operating conditions, leading to potential failures and significant economic losses.
Innovation Solution
A device and method for starting a pumped storage group, which includes an acquisition module for real-time data acquisition, a first determination module for determining the real-time speed versus time curve, and a correction module for adjusting the starting speed based on deviations from a reference speed versus time curve cluster.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional starting methods are used for pumped storage groups, then the starting process can be completed, but large speed fluctuations occur and the operating state deviates from optimal conditions, resulting in unstable operation
Solution Approach 1:
The system performs preliminary actions by acquiring historical operating condition data and determining reference speed versus time curves before actual starting occurs. These reference curves serve as pre-established guidelines for optimal speed progression during starting, allowing the system to compare real-time speed against predetermined optimal trajectories and make corrective adjustments in advance.
Solution Approach 2:
The correction module implements feedback by continuously comparing the real-time speed versus time curve with the reference speed versus time curve cluster. When deviations are detected, the system generates correction values that are fed back to adjust the starting speed, creating a closed-loop control system that maintains speed within optimal ranges and prevents excessive fluctuations.
2Reliability
If conventional starting methods are used, then the group can start, but large deviation from optimal operating state occurs, leading to prone failures and short-circuit currents
Solution Approach 1:
The correction module continuously monitors the deviation between real-time and reference speed curves, and when the deviation exceeds a threshold, it generates correction values that are fed back to the starting control system. This closed-loop feedback ensures the operating state remains precise and close to optimal conditions, preventing failures and short-circuit currents.
Solution Approach 2:
Reference speed versus time curves are determined in advance based on historical data representing optimal operating conditions. These pre-established reference curves guide the starting process to maintain precision in the operating state from the beginning, preventing deviations that could lead to failures.
3Productivity
If conventional starting methods are used, then the starting process can be completed, but equipment damage and economic loss occur due to short-circuit currents
Solution Approach 1:
The system uses feedback control to monitor speed deviations during starting and generates correction values that prevent the conditions leading to short-circuit currents. By maintaining speed within optimal ranges defined by reference curves, the system completes starting while avoiding harmful short-circuit currents that cause equipment damage.
Data Source
AI summary
A device and method for starting a pumped storage group, and a pumped storage system are disclosed. The device includes: an acquisition module configured to acquire starting data of the group in real time; a first determination module configured to determine a real-time speed versus time curve for the group based on the starting data; and a correction module configured to correct a starting speed of the group based on a deviation between a reference speed versus time curve cluster and the real-time speed versus time curve. The real-time speed of the group during starting is visualized through a curve fitting procedure to form the real-time speed versus time curve, the real-time speed versus time curve is compared with a favorable history operation curve, and the deviation between the real-time speed versus time curve and the favorable history operation curve is corrected to adjust the starting speed of the group.