Turbine Synchronization via Target Difference Angle Trajectory
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Solution Overview
Problem
Existing methods for synchronizing turbines with power networks often require unnecessary acceleration and deceleration to achieve phase matching, leading to inefficiencies and prolonged startup times, which can impact the stability and economic yield of power generation.
Innovation Solution
A method that accelerates the turbine to a nominal rotational speed without considering the difference angle, then adjusts the turbine's speed to follow a target trajectory based on the measured difference angle, ensuring rapid synchronization and maintaining the target angular position for synchronous power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the turbine is brought into angular position matching with the power network using traditional synchronizing devices, then phase synchronization is achieved, but unnecessary acceleration and deceleration occur leading to prolonged startup times
Solution Approach 1:
The control device pre-calculates a target trajectory for the difference angle between turbine and network that leads directly to the target angular position. By planning the entire synchronization path in advance rather than reacting step-by-step, the system eliminates unnecessary speed adjustments and achieves faster synchronization while maintaining reliability.
Solution Approach 2:
The system dynamically adjusts the turbine's rotational speed along a pre-calculated target trajectory for the difference angle. Instead of using fixed acceleration/deceleration patterns, the control device continuously adapts the speed profile to follow the optimal path to the target angular position, minimizing startup time while ensuring accurate phase synchronization.
2Reliability
If traditional synchronizing methods are used to match turbine angular position with power network phase, then synchronous supply is achieved, but excessive acceleration and deceleration cycles are required
Solution Approach 1:
The control device pre-calculates the complete target trajectory for the difference angle before synchronization begins. This preliminary planning identifies the optimal path directly to the target angular position, eliminating the need for multiple acceleration and deceleration cycles typical in traditional methods, thereby improving synchronization efficiency without compromising synchronous supply reliability.
Solution Approach 2:
The control device continuously monitors the actual difference angle and compares it with the pre-calculated target trajectory. Based on this feedback, the system dynamically adjusts the turbine speed to stay on the optimal synchronization path, ensuring efficient convergence to the target angular position while maintaining reliable synchronous supply.
3Loss of time
If the turbine follows a pre-calculated target trajectory for difference angle, then startup time is reduced, but complex control calculations are required
Solution Approach 1:
The control device performs the complex trajectory calculation in advance, before synchronization begins. By pre-calculating the entire target path for the difference angle based on initial conditions, the system reduces real-time computational requirements during actual synchronization, achieving fast startup times without overwhelming the control device during critical operation.
Solution Approach 2:
The control device uses dynamic calculation methods that adapt the target trajectory based on real-time conditions while following a pre-planned overall path. This dynamic approach allows the system to maintain simplicity by relying on pre-calculated frameworks while still achieving rapid synchronization through real-time adjustments.
Data Source
AI summary
A method for synchronising a turbine with an AC network having a network frequency, having the following steps: A) accelerating the turbine up to a stated rotational speed, without taking into consideration a difference angle between the turbine and the AC network; B) detecting a difference angle between the turbine and the AC network; C) accelerating or decelerating the turbine in such a way that the differential speed follows a target trajectory, wherein the target trajectory is a trajectory that indicates a target rotational speed depending on the detected difference angle, such that a target angular position that is suitable for a synchronous supply is achieved between the turbine and AC network.