Generator Output Delay Compensation for Long-Period Oscillation Control
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Solution Overview
Problem
Existing power system stabilizers (PSS) are costly and require complex operations to address both long-period and short-period oscillations, necessitating a simpler solution to inhibit long-period oscillations in power systems.
Innovation Solution
A control apparatus that calculates adjustment force command values and correction values to control power generation and distribution, including predicting responses and compensating for delays in electric output, allowing for the inhibition of long-period oscillations without the need for a PSS, by using a processor to execute processes such as calculating first and second adjustment force command values and adjusting voltage target values based on observed and predicted values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a power system stabilizer (PSS) is installed to correct voltage command for power generator, then long-period oscillations are damped, but installation cost increases and device complexity increases
Solution Approach 1:
The invention extracts only the essential oscillation damping function from the complex PSS system. By identifying that long-period oscillations can be effectively damped by correcting the voltage command based on rotor angle deviation alone, the solution removes unnecessary components and operations, achieving oscillation suppression with a simplified control structure that does not require full PSS functionality
Solution Approach 2:
The control approach segments the power system oscillation problem into specific long-period oscillation modes (over 2 seconds) and addresses them separately from short-period oscillations. By focusing control efforts only on the long-period component through selective voltage command correction, the system achieves targeted stabilization without the need for comprehensive multi-mode PSS control
2Stability of the object's composition
If PSS is installed to damp long-period oscillations, then power system stability improves, but operation complexity increases due to multiple setting values for different oscillation modes
Solution Approach 1:
The invention extracts only the essential oscillation damping function from the complex PSS system. By identifying that long-period oscillations can be effectively damped by correcting the voltage command based on rotor angle deviation alone, the solution removes unnecessary components and operations, achieving oscillation suppression with a simplified control structure that does not require full PSS functionality
Solution Approach 2:
The control parameter (voltage command correction) is dynamically adjusted based on the detected rotor angle deviation in real-time. This dynamic adjustment allows the system to automatically adapt to varying oscillation conditions without requiring manual reconfiguration of multiple fixed setting values for different modes, thereby simplifying operation while maintaining stability
3Productivity
If governor-free driving is used to adjust power generation output according to frequency, then power supply-demand balance is achieved, but long-period oscillations occur
Solution Approach 1:
The invention introduces a feedback mechanism that detects rotor angle deviation and uses it to correct the voltage command. This feedback loop counteracts the oscillatory behavior that arises from governor-free driving by continuously adjusting the voltage command based on the detected deviation, thereby stabilizing the power system while preserving the responsiveness benefits of governor-free operation
Solution Approach 2:
The control system applies preliminary anti-action by detecting rotor angle deviation and proactively correcting the voltage command before the oscillation can fully develop. This preventive approach counteracts the destabilizing effects of governor-free driving by anticipating and neutralizing oscillation tendencies through early voltage command adjustment
Data Source
AI summary
A control apparatus is configured to control driving of a power generation apparatus including a motor and a power generator. The control apparatus includes a processor configured to calculate: (i) a first adjustment force command value for controlling the motor in accordance with a deviation between an observed value and a reference value of a rotation speed of the power generator; (ii) a correction value for compensating for a delay of an electric output of the power generator; and (iii) a second adjustment force command value for controlling the motor by adding the first adjustment force command value and the correction value.