N-1 Static Security Analysis for Integrated Energy Systems
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Solution Overview
Problem
The complexity of integrated energy systems (IES) with multiple energy sources like electricity, gas, and heat poses challenges in ensuring secure and stable operation due to complex coupling mechanisms, requiring advanced security analysis methods beyond traditional single-energy subsystem analysis.
Innovation Solution
An N-1 static security analysis method is developed for IES, constructing a model that includes electro-gas-thermal coupling elements, calculating energy flow equations, and performing security verification under different conditions to assess the operating status and security of the system, using mathematical models for CHP, P2G, gas boiler, and gas turbine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional single-energy subsystem analysis method is used, then the analysis process is simple, but it is no longer applicable to the complex static interaction coupling mechanism among subsystems in IES
Solution Approach 1:
The patent segments the complex IES security analysis into three distinct modules: (1) N-1 static security analysis module for power system, (2) N-1 static security analysis module for gas system, and (3) N-1 static security analysis module for heat system. Each module independently analyzes its respective subsystem while considering coupling effects, making the overall complex analysis manageable and applicable to IES.
Solution Approach 2:
The patent creates a universal N-1 static security analysis framework that can be applied across multiple energy subsystems (power, gas, heat) simultaneously. The methodology uses unified mathematical models and analysis procedures that work across different energy types, enabling the analysis method to be universally applicable to the multi-energy coupling environment of IES.
2Reliability
If comprehensive energy system security analysis is performed, then the security evaluation is thorough, but the analysis complexity increases significantly
Solution Approach 1:
The comprehensive security analysis is segmented into subsystem-specific N-1 analysis modules for power, gas, and heat systems. Each module performs focused security verification on its respective subsystem under N-1 contingency conditions, achieving thorough security evaluation while avoiding the overwhelming complexity of a completely integrated analysis approach.
Solution Approach 2:
The patent dynamically adjusts the analysis depth and scope for each subsystem based on its specific characteristics and coupling strength. The methodology allows flexible application of N-1 analysis to different subsystems, enabling comprehensive security evaluation while adapting the analysis complexity to match the actual system requirements.
3Measurement precision
If coupling elements output changes are analyzed, then the security impact assessment is accurate, but the affected range and extent of impact become difficult to determine
Solution Approach 1:
The patent segments the impact assessment into subsystem-specific analyses, where each N-1 module evaluates the impact of coupling element changes on its respective energy subsystem. This segmentation makes it easier to determine the affected range and extent of impact within each subsystem while maintaining accurate overall security assessment through the integrated framework.
Data Source
AI summary
The present invention discloses an N-1 static security analysis method for integrated energy system, including the following steps: constructing a static model of the IES including electro-gas-thermal coupling elements, calculating multiple energy flow equations, and calculating the multiple energy flow of the IES to obtain an operating status of the IES; constructing a N-1 preconceived accident set, calculating multiple energy flow of the IES, and performing security verification to the status of the coupling elements in each preconceived accident set, respectively; analyzing the security verification results by comparing the results of static security analysis under different control modes, so that an N-1 static security analysis is achieved. The present invention fully researches the security of the IES, comprehensively considers the influence of the output changes of the coupling elements on the operating point of the energy system, and evaluates the security and stability of the IES.