Bypass Damping Filter Parameter Tuning for SSR Suppression
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Solution Overview
Problem
Current parameter tuning approaches for bypass damping filters (BDF) are inadequate in effectively suppressing torsional interaction and torque amplification effects in power systems, despite their effectiveness in addressing induction generator effects, leading to incomplete recognition of their suppression capabilities.
Innovation Solution
A parameter tuning approach for BDF that involves calculating specific frequencies, per-unit capacitance and reactance, and adjusting the damping resistor to minimize generator negative electrical damping, thereby avoiding torsional modes and ensuring a reasonable damping range, which enhances the suppression of subsynchronous resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If BDF parameters are tuned to suppress all SSR types, then comprehensive suppression is achieved, but parameter tuning complexity increases
Solution Approach 1:
The patent applies self-service by providing a systematic parameter tuning methodology where the BDF parameters are automatically determined through calculated formulas based on measurable system characteristics (XL, XC, fn). The method eliminates the need for complex iterative tuning or expert judgment by enabling direct calculation of optimal parameters from system data, thus reducing tuning complexity while achieving comprehensive SSR suppression
2Reliability
If damping resistor value is increased to suppress subsynchronous currents, then suppression effect improves, but steady-state operation may be influenced
Solution Approach 1:
The patent applies local quality by designing the BDF with frequency-dependent impedance characteristics where the damping resistor Rbdf provides strong damping specifically at subsynchronous frequencies (where SSR occurs) while having minimal impact on steady-state operation at rated frequency. The parameter tuning ensures Rbdf is optimized for subsynchronous current suppression while the filter's impedance at rated frequency remains high, preventing interference with normal operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed approach improves the suppression of subsynchronous resonance by effectively addressing torsional interaction and torque amplification, shifting negative electrical damping away from shaft torsional modes and reducing transient torque, thus ensuring stable generator operation.
Implementation Method 1
The parallel combination of the reactor and the capacitor in the BDF is designed to be tuned at the system rated frequency so that its impedance at the rated frequency is high. In transient states, as the impedance of the parallel combination decreases significantly at the subsynchronous frequencies, the BDF acts as a resistive/inductive bypass path for subsynchronous currents and the damping resistor in the BDF has suppression effect on the sub synchronous currents.
Implementation Method 2
the damping resistor in the BDF has suppression effect on the sub synchronous currents
Data Source
AI summary
The present invention discloses a parameter tuning approach for bypass damping filter to suppress subsynchronous resonance in power systems, namely determining the parameters of capacitor, inductor and damping resistor in BDF. Using this approach, the parameters of capacitor and inductor in BDF can be adjusted, so that the frequency where the negative electrical damping of generator reaches minimum can be away from the frequency range of low frequency oscillation mode and typical frequencies of each torsional mode; the parameter of damping resistor in BDF can be further adjusted so that the minimum value of negative electrical damping is in reasonable range. The application of BDF with parameters tuned by the present invention contributes to the suppression of both the torsional interaction effect and the transient torque amplification effect.