Dynamic Equivalent Circuit for CHP Thermal Delay and Heat Storage

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Solution Overview

Problem

Current simulation systems for combined heat and power systems are complex, difficult to maintain, and lack unified representation of thermoelectric heterogeneous energy sources, failing to accurately model dynamic thermal processes due to their heterogeneity and independent software components.

Innovation Solution

A dynamic equivalent circuit model is introduced, using controlled sources for thermoelectric coupling, equivalent inductance for heat transmission delay, equivalent resistance for heat load and loss, and equivalent capacitance for heat storage, allowing for a unified representation and simulation of thermoelectric heterogeneous energy sources within a single power simulation tool.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple types of energy simulation software are used for co-simulation, then the combined heat and power system can be simulated, but the simulation system structure becomes complex and maintenance becomes inconvenient

Engineering Contradiction:

Improvesimulation capabilityVSAvoidsystem structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges multiple energy simulation software into a unified power simulation tool by creating an equivalent circuit model that integrates electrical, thermal, and mechanical domains. This consolidation eliminates the need for separate simulation programs while maintaining comprehensive simulation capability for combined heat and power systems.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates a universal power simulation tool that can handle multiple energy types (electrical, thermal, mechanical) through a single integrated platform. The equivalent circuit model serves as a multi-functional framework that adapts to simulate different energy conversion and transmission processes within the combined heat and power system.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If multiple independent simulation software programs are used, then different energy types can be simulated, but data delay and limited interface development occur

Engineering Contradiction:

Improveenergy simulation coverageVSAvoiddata delay

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

By combining multiple independent simulation software into a single integrated power simulation tool, the patent eliminates data communication interfaces between separate programs. This unified approach removes data transmission delays and interface limitations, allowing real-time simulation of multi-energy interactions.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of operation

If simple device models are added to power analysis tools, then the simulation system is easier to operate, but the dynamic process of thermal system cannot be reflected

Engineering Contradiction:

Improvesimulation operationVSAvoidthermal dynamic accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent transforms thermal system parameters into equivalent electrical circuit parameters (resistance, inductance, capacitance) that can be processed by power analysis tools. This parameter transformation maintains the dynamic characteristics of thermal systems while enabling their simulation within standard electrical power analysis environments, thus preserving both ease of operation and thermal dynamic accuracy.

Inventive Principle:

Principle #35Parameter changes

4Device complexity

If heat transmission delay and heat loss are not considered, then the simulation model is simpler, but the accuracy of thermal system simulation is reduced

Engineering Contradiction:

Improvemodel complexityVSAvoidthermal simulation accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent substitutes thermal transmission processes with equivalent electrical circuit elements. Heat transmission delay is represented by equivalent inductance, heat loss by equivalent resistance, and heat storage by equivalent capacitance. This substitution maintains thermal dynamic accuracy while utilizing well-established electrical circuit analysis methods, effectively balancing model complexity with simulation precision.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS12144254B2Dynamic equivalent circuit of combined heat and power system, and working method thereof

Publication Date: 2024.11.12 SHANDONG UNIV

AI summary

The present disclosure discloses a dynamic equivalent circuit of a combined heat and power system, and a working method thereof. Controlled sources are used to represent a thermoelectric coupling source; equivalent inductance is used to represent a delay of a heat transmission pipeline; equivalent resistance is used to represent a heat load and a heat loss of the heat transmission pipeline; and equivalent capacitance is used to represent a heat storage water tank. A circuit model is used to uniformly represent two thermoelectric heterogeneous energy sources, and a single power simulation tool may be used to simulate a combined heat and power system, so that the simulation system has a simple structure and is easy to develop and maintain.