GPSS Damping Verification Under Fault-Free Line Disconnection
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Solution Overview
Problem
Existing methods for verifying low-frequency oscillation damping control effects of governor power system stabilizers (GPSS) lack systematic verification, comprehensive consideration of overall system performance, and optimization, particularly in complex power grid environments, limiting their effectiveness in weak interconnection and high-proportion new energy systems.
Innovation Solution
A method involving a fault-free disconnection test with equivalent impedance calculation, unit test construction, electromagnetic power fluctuation recording, and cyclic testing to evaluate damping effects, using equations to quantify stability and optimize control parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PSS is used to suppress low-frequency oscillation, then damping characteristics are improved, but effectiveness is limited in weak interconnection systems and high-proportion new energy systems
Solution Approach 1:
The patent changes the control parameter from excitation system voltage (PSS) to governor system frequency/speed (GPSS), fundamentally altering the control mechanism to adapt to weak interconnection and new energy systems where excitation control is less effective
Solution Approach 2:
The patent introduces GPSS as an intermediary control mechanism on the governor side, which mediates the oscillation suppression by acting on the speed governing system rather than directly on the excitation system, enabling effective control in systems where traditional PSS fails
2Reliability
If GPSS is applied to improve stability, then damping effect is enhanced, but lack of field test verification limits practical application
Solution Approach 1:
The patent performs preliminary field tests and data collection before full-scale deployment of GPSS, gathering baseline oscillation data and system characteristics to verify effectiveness and guide subsequent practical applications
Solution Approach 2:
The patent implements feedback mechanisms by continuously monitoring system oscillation characteristics during field tests, comparing actual performance with simulation predictions, and using this feedback to refine GPSS control parameters and verify damping effectiveness
3Speed
If coordinated control capacity is not fully utilized, then system response speed is limited, but comprehensive optimization requires complex verification
Solution Approach 1:
The patent segments the verification process into distinct components: oscillation data collection, GPSS control parameter adjustment, damping effect measurement, and coordinated control evaluation, allowing systematic verification of each aspect without overwhelming complexity
Solution Approach 2:
The patent adds a new dimension to verification by simultaneously evaluating both individual unit performance and coordinated control effects across multiple generators, enabling comprehensive assessment of system-wide response speed and stability improvement
Data Source
AI summary
Disclosed are a method and system for verifying a low-frequency oscillation damping control effect of a governor power system stabilizer (GPSS), relating to the technical field of power systems. The method includes: selecting a wiring working condition for a fault-free disconnection test, and constructing a unit test working condition; performing the fault-free disconnection test on an outgoing line of a power plant, and collecting an electromagnetic power fluctuation recording curve; and comparing low-frequency oscillation damping effects under different GPSS settings, evaluating the effects, and performing a cyclic test. A success rate of the test is increased, safety of the test is improved, and the overall stability and anti-oscillation capacity of the system are improved in the disclosure.