Distributed FACTS Voltage Injection for Power Oscillation Damping
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Solution Overview
Problem
High voltage power systems face challenges in damping power oscillations due to reduced inertial components from renewable energy sources, leading to instability and potential cascading failures, as existing centralized control methods are costly, inefficient, and inadequate for modern power systems with increased transient events.
Innovation Solution
Implementing a distributed power oscillation damping system using flexible alternating current transmission system (FACTS) devices, specifically distributed static series synchronous compensators with high-speed communication, to inject impedance and voltage across the power system, effectively counteracting oscillations through coordinated action across multiple locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If centralized FACTS devices and HV DC converters are used for power oscillation damping, then damping capability is improved, but system cost and complexity increase significantly
Solution Approach 1:
The invention divides the power system into multiple control zones with local oscillation damping controllers at each zone, replacing the need for a single centralized high-power device. Each local controller independently damps oscillations in its zone, achieving system-wide damping through distributed action, thereby reducing overall system complexity and cost while maintaining reliability.
Solution Approach 2:
The invention introduces a high-speed communication network as an intermediary to coordinate control signals between distributed generators and local controllers. This communication mediator enables synchronized oscillation damping across the system without requiring direct physical connection of high-power damping devices, reducing complexity while preserving damping effectiveness.
2Adaptability or versatility
If renewable energy sources replace synchronous generators, then environmental sustainability is improved, but system inertia and natural damping capability are reduced
Solution Approach 1:
The invention enables distributed generators to provide their own oscillation damping control through locally installed controllers that detect and counteract oscillations in real-time. This self-service approach allows renewable energy sources to maintain system stability without relying on the inertial properties of traditional synchronous generators, thus preserving stability while enabling renewable integration.
Solution Approach 2:
The invention changes the control parameters of distributed generators from simple power injection to active oscillation damping control. By adjusting voltage and frequency parameters dynamically based on detected oscillation modes, the system compensates for the lack of natural inertia in renewable sources, maintaining stability while accommodating high renewable penetration.
3Reliability
If distributed voltage/impedance injection modules are deployed across power lines, then oscillation damping effectiveness is improved, but device distribution complexity increases
Solution Approach 1:
The invention designs a universal distributed controller module that can be deployed at any location in the power system and performs multiple functions: oscillation detection, mode identification, and damping control. This multi-functional module reduces distribution complexity by using a standardized design across all locations rather than custom solutions for each site.
Solution Approach 2:
The invention implements real-time feedback control where each distributed module continuously monitors local voltage and current signals, detects oscillation patterns, and adjusts its impedance injection accordingly. This automatic feedback mechanism simplifies distribution by enabling autonomous operation at each location without requiring complex centralized coordination of individual devices.
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
This approach significantly reduces residual power in dominant oscillatory modes, enhancing system stability by providing faster, more efficient, and cost-effective damping of power oscillations, even in systems with low inertia and high transient events.
Implementation Method 1
a group of distributed flexible alternating current transmission system (FACTS) devices that are voltage/impedance injection modules, distributed over the power system
Implementation Method 2
the systems tend to go into power oscillations at a resonant frequency of the system, which is an oscillatory mode of the system
Implementation Method 3
These devices generate and inject the cumulative voltage needed for power oscillation damping
Data Source
AI summary
Methods for damping oscillations in a high voltage power grid, including power distribution and supply systems by distributing a plurality of voltage/impedance injection modules to inject voltages/impedances onto high voltage power transmission lines of the power grid, sensing power oscillations on the high voltage transmission lines, extracting the dominant oscillatory mode or modes of sensed power oscillations on the high voltage transmission lines, and injecting voltages/impedances responsive to at least the most dominant oscillatory mode onto the respective high voltage transmission lines to counteract the respective oscillations.