Grid-Scale Storage Control for Power System Stability
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Solution Overview
Problem
Traditional Power System Stabilizers (PSS) face limitations such as providing negative damping, being ineffective under non-linear power system conditions, and being designed to damp only specific oscillation modes, which can lead to instability and reduced effectiveness with increasing renewable energy penetration and inter-area oscillations.
Innovation Solution
A Wide-area Measurement System (WAMS) based control method that uses synchronized phasor measurements from multiple phasor measurement units to estimate oscillation modes, perform modal analysis, and construct a control signal for Grid-Scale Storage (GSS) to dampen critical oscillations, enhancing power system stability through adaptive closed-loop control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PSS parameters are designed offline based on linearized model, then design simplicity is improved, but performance under large disturbances and non-linear conditions deteriorates
Solution Approach 1:
The system implements real-time feedback by continuously monitoring wide-area phasor measurements and dynamically adjusting control parameters. The controller performs ongoing modal analysis to identify current oscillation modes and adapts the damping control accordingly, enabling effective performance under varying operating conditions and large disturbances without requiring offline re-design.
Solution Approach 2:
The control system transitions from static offline-parameter design to dynamic real-time adaptation. By continuously analyzing phasor measurements and adjusting control actions based on current system state, the controller maintains effectiveness under non-linear conditions and large disturbances that would invalidate fixed offline parameters.
Data Source
AI summary
A method and system are provided. The method includes collecting, from a plurality of phasor measurement units, a plurality of synchronized phasor measurements from different portions of a power system. The method further includes estimating, by a controller, oscillation modes of the plurality of synchronized phasor measurements. Each estimated oscillation mode specifies, for each of the plurality of synchronized phasor measurements, two or more of an amplitude, a phase, a frequency, and damping coefficients. The method also includes performing, by the controller, a modal analysis of the oscillation modes of the plurality of synchronized phasor measurements to identify critical modes based on critical mode identifying criteria. The method additionally includes constructing, by the controller based on the critical modes, a power system oscillation dampening control signal for controlling a grid-scale storage portion of the power system to dampen one or more oscillations of the power system at any given time.