Hybrid Power Conditioner Harmonic Filtering Oscillation Damping

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Solution Overview

Problem

Existing harmonic filtering and reactive power compensation methods, particularly in high-power applications, are inadequate as they require high electric current for power electronic devices and often introduce oscillations due to the coupling of passive filters with power line impedance.

Innovation Solution

A hybrid conditioner comprising an active filter and a passive filter connected in parallel, where the active filter handles high-order harmonic currents and provides reactive power compensation, while the passive filter handles low-order harmonic currents, with the active filter also damping oscillating currents between the passive filter and the AC source.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If passive filters are used for harmonic filtering, then filtering performance for specific harmonic orders is improved, but oscillation is introduced due to coupling with power line impedance

Engineering Contradiction:

Improveharmonic filtering performanceVSAvoidoscillation

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The filtering function is segmented between passive filters (handling specific low-order harmonics) and active filters (handling high-order harmonics and oscillation). This division allows each filter type to operate in its optimal range, with active filters compensating for the oscillation issue introduced by passive filters.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Active filters serve as an intermediary that compensates for the harmful oscillation effects generated by passive filters. The active filter detects and counteracts oscillating currents, effectively mediating between the passive filter and the power system to eliminate the harmful oscillation while preserving the harmonic filtering benefits.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If active filters are used for harmonic filtering, then reactive power compensation capability is improved, but current requirements for power electronic devices increase

Engineering Contradiction:

Improvereactive power compensation capabilityVSAvoidcurrent requirements for power electronic devices

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The current handling responsibilities are segmented between passive filters (handling high current for low-order harmonics) and active filters (handling lower current for high-order harmonics and reactive power). This segmentation reduces the current burden on power electronic devices in the active filter while maintaining comprehensive filtering and compensation capabilities.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent combines passive and active filter technologies into a hybrid system that merges the high current handling capability of passive filters with the adaptive reactive power compensation of active filters. This combination achieves versatile compensation functionality without requiring the active filter components to handle excessive current.

Inventive Principle:

Principle #5Merging (Combining)

3Use of energy by moving object

If passive filters are used for reactive power compensation, then natural reactive power provision is improved, but compensation adequacy is insufficient

Engineering Contradiction:

Improvenatural reactive power provisionVSAvoidcompensation adequacy

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The hybrid system merges the natural reactive power provision of passive filters with the controllable reactive power compensation of active filters. The passive filter provides a baseline level of reactive power naturally, while the active filter supplements this with additional controllable compensation to achieve adequate overall compensation performance.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The active filter component is designed with multi-functionality, serving both as a high-order harmonic filter and as a reactive power compensator. This universal approach allows the active filter to enhance the passive filter's natural reactive power provision, ensuring adequate compensation across varying load conditions.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS8363433B2Hybrid conditioner for a power system

Publication Date: 2013.01.29 GE ENERGY POWER CONVERSION TECHNOLOGY LTD(GB)

AI summary

A hybrid conditioner for filtering harmonics in a power system that includes a non-linear load. The hybrid conditioner includes an active filter structured and controlled to filter one or more high-order harmonic currents of the fundamental frequency, and a passive filter structured to filter one or more low-order harmonic currents of the fundamental frequency. The active filter and the passive filter are electrically connected in parallel with one another. The hybrid conditioner may also be for providing reactive power compensation for the power system, wherein the active filter is further controlled to provide a compensatory reactive power for compensating for the reactive power that is consumed by the load. The hybrid conditioner may also provide oscillation dampening for the power system, wherein the active filter is further controlled to damp oscillating currents that exist between the passive filter and the AC source.