State estimation method for heating network in steady state based on bilateral equivalent model
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Solution Overview
Problem
Existing methods for analyzing heating networks fail to account for asymmetry between supply and return networks, leading to inadequate monitoring of operating conditions, especially during failures or repairs, as they assume equal mass flow rates in both networks.
Innovation Solution
A state estimation method based on a bilateral equivalent model is proposed, which considers mass flow rates, pressures, and temperatures in both supply and return branches, using incidence matrices and optimization techniques to accurately model and estimate the steady-state operation of heating networks, including heat sources and loads as connecting branches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If symmetric processing is performed assuming equal mass flow rates in supply and return networks, then analysis complexity is reduced, but monitoring capability of return network operating conditions is lost
Solution Approach 1:
The heating network is segmented into supply network and return network with separate analysis. The method divides the network into connected components and processes each component independently, allowing asymmetric treatment of supply and return branches while maintaining manageable complexity through modular analysis.
Solution Approach 2:
The method explicitly handles asymmetry between supply and return networks by treating them differently in the analysis. Different mass flow rates are assigned to supply and return branches, and the algorithm processes asymmetric topological structures where supply and return networks may have different configurations, particularly when lines fail or are under repair.
2Measurement precision
If asymmetric conditions between supply and return networks are handled, then monitoring accuracy is improved, but computational complexity increases
Solution Approach 1:
The method dynamically adjusts the analysis based on network conditions. When asymmetry is detected (such as during failures or repairs), the algorithm switches to asymmetric processing mode. The computational approach adapts to the actual network state, using different calculation paths for symmetric and asymmetric conditions.
Solution Approach 2:
The method applies partial asymmetric processing only where needed rather than throughout the entire network. By identifying affected connected components and processing only those portions asymmetrically, the computational overhead is minimized while still achieving accurate monitoring where it matters most.
3Ease of operation
If only supply network hydraulic conditions are analyzed, then analysis simplicity is maintained, but thermal operating conditions of return network cannot be assessed
Solution Approach 1:
The method merges hydraulic and thermal analysis into a unified framework. By combining the analysis of both supply and return networks with integrated mass flow rate calculations, the method simultaneously assesses hydraulic conditions and thermal operating conditions without requiring separate analysis procedures.
Data Source
AI summary
A state estimation method for a heat supply network in a steady state based on a bilateral equivalent model is provided. The method includes: establishing the bilateral equivalent model based on a mass flow rate in each supply branch of the heating network, a mass flow rate in each return branch of the heating network, a mass flow rate in each connecting branch of the heating network, a pressure and a temperature of each node in the heating network, wherein each heat source is configured as a connecting branch and each heat load is configured as a connecting branch; and repeatedly performing a state estimation on the heating network based on the bilateral equivalent model, until a coverage state estimation result is acquired.