Reduced Network Model Screening for Power Distribution Analysis

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Solution Overview

Problem

Complexity in analyzing electrical power distribution systems with distributed generation sources, such as wind and solar farms, makes full-model analysis computationally intensive and infeasible for timely decision-making, especially due to the variability of these sources.

Innovation Solution

A system and method that involves generating a reduced network model from a full network model, allowing for quicker simulation and analysis of multiple scenarios, followed by a subset selection for further analysis using the full model to dispatch configuration commands to utility assets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If full-model analysis is used to analyze electrical power distribution systems, then measurement precision and reliability are improved, but computational time and complexity increase significantly

Engineering Contradiction:
Improveanalysis accuracyVSAvoidcomputational time
Core Design Contradiction:
Measurement precisionVSLoss of time

Solution Approach 1:

The patent segments the analysis process into two distinct phases: (1) a reduced-model analysis phase that screens multiple scenarios to identify critical ones, and (2) a full-model analysis phase that provides detailed accurate analysis only for the selected critical scenarios. This segmentation resolves the contradiction by applying different levels of model fidelity to different subsets of scenarios, thereby reducing overall computational time while maintaining accuracy for the most important cases.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent employs a reduced network model that is computationally inexpensive to execute, using it as a disposable screening tool to eliminate irrelevant scenarios. This cheap model sacrifices some accuracy but enables rapid evaluation of many scenarios, after which only the most critical ones proceed to the expensive full-model analysis, thus resolving the time-accuracy tradeoff.

Inventive Principle:
Principle #27Cheap short-living objects (Disposable)

2Measurement precision

If full-model analysis is used to analyze electrical power distribution systems, then analysis accuracy is improved, but device complexity increases making the system infeasible for timely decision-making

Engineering Contradiction:
Improveanalysis accuracyVSAvoidsystem complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the analysis system into two distinct computational components: a reduced-model analysis engine for rapid scenario screening and a full-model analysis engine for detailed accurate analysis. This segmentation resolves the complexity contradiction by organizing the computational workload into manageable stages, where the simple reduced model handles the bulk of scenario evaluation and the complex full model is invoked only when necessary.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The reduced network model serves as an intermediary between the scenario definition and the full-model analysis. It acts as a filtering mechanism that translates the large set of input scenarios into a smaller set of critical scenarios suitable for full-model analysis, thereby reducing the complexity burden on the decision-making system while preserving accuracy for important cases.

Inventive Principle:
Principle #24Intermediary (Mediator)

3Reliability

If multiple scenarios are analyzed to account for variability in distributed generation sources, then reliability and completeness of assessment are improved, but computational time becomes excessive

Engineering Contradiction:
Improveassessment completenessVSAvoidcomputational time
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The patent segments the scenario analysis into two stages: first, a reduced-model stage that rapidly evaluates all scenarios to identify critical ones, and second, a full-model stage that provides detailed accurate analysis only for the critical subset. This segmentation enables comprehensive scenario coverage while controlling computational time by applying different analysis depths to different scenarios.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent applies partial action by performing complete accurate analysis (full-model) only on the critical scenarios identified by the reduced model, rather than performing full analysis on all scenarios. This partial application of the expensive analysis method achieves reliable assessment of the most important cases while avoiding excessive computational time that would result from analyzing all scenarios with equal depth.

Inventive Principle:
Principle #16Partial or excessive action

Data Source

PatentUS9252633B2System and method for accelerated assessment of operational uncertainties in electrical power distribution systems
Publication Date: 2016.02.02 GE DIGITAL HLDG LLC
  • US9252633B2 patent drawing
  • US9252633B2 patent drawing
  • US9252633B2 patent drawing

AI summary

A system for accelerated assessment of operational uncertainties in an electrical power distribution system includes a plurality of utility assets, and a distribution analysis (“DA”) system. DA system includes a preparation module configured to identify a first network model and a reduced network model for the electrical power distribution system. DA system also includes an input module configured to identify a plurality of scenarios, and a reduced-model-analysis module configured to analyze the reduced network model using the plurality of scenarios, generating a first set of results, and to select a subset of scenarios based on the first set of results. DA system further includes a full-model-analysis module configured to analyze the first network model using the subset of scenarios, generating a second set of results. DA system also includes a command module configured to dispatch configuration commands to utility assets based on the second set of results.