An evaluation method for flexibility of combined heat and power dispatching considering energy storage characteristics of heat network

Abstract

The invention provides a method for evaluating the flexibility of combined heat and power dispatching considering the energy storage characteristics of the heat network, comprising the following steps: 1) determining the control variables affecting the flexibility of the district heating pipe network; 2) establishing a constant temperature and constant flow control mode The combined heat and power scheduling optimization problem considering the transmission delay of the heat network; 3) Solve the optimization problem in the constant temperature and constant flow mode, and the obtained combined heat and power scheduling results are used to calculate the heat input and heat storage level in the district heating network, and use This is the benchmark value for the flexibility assessment of the heating network; 4) The heating network is abstractly represented as a generalized thermal energy storage device, under different heating control modes, according to the benchmark value provided in step 3), calculate the heating supply The operation flexibility index of the system includes the minimum / maximum heat input of generalized thermal energy storage at each moment, and the minimum / maximum heat storage level of generalized thermal energy storage at each moment, so as to quantitatively evaluate the heating system as a generalized thermal energy storage The operational flexibility that the device can provide.

Description

technical field [0001] The invention relates to a flexibility evaluation method for combined heat and power dispatching, in particular to design a flexibility evaluation method for combined heat and power dispatch considering the energy storage characteristics of a heat network. Background technique [0002] The penetration rate of renewable energy in the power system has been increasing in recent years. Due to the large fluctuation and randomness of renewable energy power generation, higher requirements are placed on the safe and reliable operation of the power system. Improving the operational flexibility of the system can enable the system to cope with more complex fluctuations, help maintain a balance between supply and demand, and promote large-scale integration of renewable energy. Through the combined heat and power (CHP) system for the coupling of electricity and heat, and adopting effective combined heat and power dispatch (CHPD), the energy interaction between the...

AI Technical Summary

Problems solved by technology

Most of the existing methods are based on the simulation analysis of the system dispatching operation strategy based on the combined heat and power dispatching model, which lacks the quantitative flexibility evaluation of the energy storage characteristics of the heating network. How to establish a general and direct flexibility index and evaluation method for the The energy storage characteristics of DHN and the flexibility evaluation of different control modes (such as variable pipeline flow and heat source water supply temperature) are one of the key issues that need to be solved urgently.

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