Method and system for controlling variable-flow hydraulic equilibrium of secondary pipe network by physically fusing information

Abstract

The invention relates to the field of advanced control of urban intensive heat supply systems, in particular to a method and a system for controlling variable-flow hydraulic equilibrium of a secondarypipe network by physically fusing information. The method for controlling hydraulic equilibrium comprises the following steps: step S100 of acquiring pipe network data, which corresponds to the heatsupply secondary pipeline network, of each user, and representative room temperature data; step S200 of establishing a hydraulic simulation model of the heat supply secondary pipe network to obtain characteristics of a hydraulic equilibrium relationship of the secondary pipe network on line; step S300 of determining flow needed for each user under a working condition based on the pipe network dataand the room-temperature data; step S400 of calculating unit resistance characteristics which correspond to flow needed by each user through the hydraulic simulation model; and step S500 of determining a control strategy of each user valve which corresponds to the unit resistance characteristics. The method realizes simulation analysis and calculation for a needed working condition, and predicates the control strategy of hydraulic equilibrium under the needed working condition.

Description

technical field [0001] The invention relates to the field of advanced control of urban central heating systems, in particular to a method and system for regulating and controlling the hydraulic balance of secondary pipe networks with variable flow rate and physical integration of information and physics. Background technique [0002] At present, the operation mode of the secondary network of the heating system is relatively extensive. At present, it is mostly used to operate at a constant flow throughout the heating season. In different stages of the heating season, the building load requirements are different, and most of them do not adopt the required Economic flow, for thermal stations mixed with public buildings, to reduce flow fluctuations caused by night loads, which will cause hydraulic imbalance in the secondary network. The original manual valve control method is difficult to adjust the variable flow during the heating season, resulting in energy A large amount of w...

AI Technical Summary

Problems solved by technology

However, when the secondary network variable flow is adjusted as needed, it is easy to cause the hydraulic imbalance of the overall secondary network. The existing hydraulic condition adjustment methods of the secondary network are mostly constant flow operation or feedback control methods. Typical methods include water pump frequency conversion The method of tracking the temperature of the building or the supply and return water of the building, or by installing self-operated balancing valve (differential pressure valve) and other equipment, tracking the set value of the flow rate (or pressure difference) entering the building, to implement the working condition adjustment of the secondary network

However, the main disadvantages of this method are as follows: first, the feedback control method based on the local adjustment strategy is likely to cause system oscillation when the working conditions fluctuate; Material load fluctuations are adjusted on demand, there is a lack of coordination and coordination among multiple balance valves, and hydraulic imbalance is prone to occur when the working conditions fluctuate greatly

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