Power Network Harmonic Reduction via Topology Control
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Solution Overview
Problem
Power networks face issues with high harmonic levels due to resonance catastrophes, which can irreversibly damage components, especially during transitional states in wind farms, where network or controller resonances amplify feed frequencies, leading to large amplitudes with low damping.
Innovation Solution
A method and device that gather network topology information at a predetermined nominal frequency, determine harmonic and resonance information, and output evaluation information to control switching states and operating modes, thereby avoiding or resolving resonances and harmonic level increases by adjusting the power network topology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If network topology is changed during transitional states in wind farms, then power network operation is enabled, but harmonic levels increase and resonance catastrophes occur
Solution Approach 1:
The system performs preliminary analysis of network topology information before switching operations to predict harmonic levels and resonance risks. By evaluating the upcoming topology state in advance, the system can prevent resonance catastrophes before they occur during transitional states in wind farms.
Solution Approach 2:
The system continuously monitors network topology changes and feeds this information back to the harmonic analysis module. This feedback loop enables real-time detection of resonance conditions and allows the system to adjust switching sequences to avoid harmonic amplification and resonance catastrophes.
2Reliability
If switching sequence of network equipment is modified during network construction, then resonance catastrophes are avoided, but productivity decreases
Solution Approach 1:
The system pre-calculates safe switching sequences by analyzing network topology information before construction operations begin. This preliminary planning identifies resonance-free switching paths, allowing rapid execution of pre-approved sequences without real-time delays for safety checks.
Solution Approach 2:
The system dynamically adjusts switching parameters based on real-time network topology analysis. By changing switching timing and sequence parameters according to predicted harmonic levels, the system maintains fast construction speed while avoiding resonance catastrophes through adaptive parameter optimization.
Data Source
AI summary
A method performed by one or more devices is disclosed in which network topology information indicative of a function of a power network is gathered at a predetermined nominal frequency. The nominal frequency is influenced by a power input, a power output, a rotational speed, a torque, a modulation angle, and/or a phase angle of components included in the power network. Harmonic information indicative of one or more harmonic levels is determined from the components of the power network or from one or more network nodes. The harmonic information is determined based on the network topology information. Evaluation information indicative of an occurrence of one or more resonances and/or harmonic level increases in the power network is determined. The evaluation information is determined based on the determined harmonic information. The determined evaluation information is output.