CN-121981851-A - Safe operation method and device of multi-energy-flow-coupled sewage treatment energy supply system

Abstract

The invention relates to the technical field of energy supply systems, and provides a safe operation method and a safe operation system of a sewage treatment energy supply system with multi-energy flow coupling. The safety operation method of the multi-energy flow coupling sewage treatment energy supply system comprises the steps of constructing a comprehensive objective function by adopting weighted synthesis based on three targets of total cost minimization of a system life cycle, minimization of carbon emission of the system year/life cycle and loss load risk index of the system year/life cycle, solving the comprehensive objective function by using safety operation behavior constraint to obtain a configuration scheme of each device in the sewage treatment energy supply system, and providing unified and powerful tool support for decision making of the multi-energy flow system of a sewage treatment plant in different stages and under different targets.

Inventors

• HUANG HUIQUN
• LIU WEI
• FENG CHENGHONG
• ZHANG XIA
• WANG CHENG
• Ge Sujin
• WU QING
• LIU DI
• ZHANG CHUANZHI
• LI JIANPENG
• XU GUANGQIANG
• CAO XIAOMAN
• YANG XIAOHUA
• GUO FUMIN
• LI HUI
• SHAN WENHAO
• SONG ZHEN
• ZHANG SHUCHUAN

Assignees

• 山东电力工程咨询院有限公司

Dates

Publication Date

20260505

Application Date

20251229

Claims (10)

1. 1. A safe operation method of a multi-energy flow coupled sewage treatment energy supply system is characterized by comprising the following steps: Based on three targets of minimizing total cost of the system life cycle, minimizing carbon emission of the system year/life cycle and losing load risk index of the system year/life cycle, constructing a comprehensive objective function by adopting weighted synthesis; The method comprises the steps of solving a comprehensive objective function by means of safe operation behavior constraint to obtain a configuration scheme of each device in a sewage treatment energy supply system, wherein in the process of solving the comprehensive objective function, an original problem of an uncertainty scene is decomposed into a main problem and a plurality of sub-problems, the main problem solves the device configuration scheme and transmits the main problem to each sub-problem, the sub-problems perform operation optimization based on given configuration, and operation cost is fed back to the main problem in a manner of Benders cut and used for iteratively correcting the configuration scheme.
2. 2. The method for safely operating a multi-energy flow coupled sewage treatment energy supply system of claim 1, ; Wherein: Is the minimum comprehensive evaluation value; 、 And Is the weight; a lifecycle cost reference value for powering a pure electrical network; a annual carbon emission reference value for powering a pure electric network; a maximum interruption rate reference value allowed by industry standards; is the total cost of the life cycle of the system; Carbon emissions for the system year/life cycle; the risk index for system year/life cycle load shedding.
3. 3. The method for safely operating a multi-energy flow coupled sewage treatment energy supply system of claim 1, wherein the total cost of the system life cycle is expressed as: Wherein, the For the total cost of the system lifecycle, In order to make the equipment investment, For the cost of the pipeline, The modification cost is high, and the modification cost is high, In order to be able to carry out the maintenance costs, Is the outsourcing electricity/fuel cost.
4. 4. The method for safely operating a multi-energy flow coupled sewage treatment energy supply system of claim 1, wherein the expression of the annual/life cycle carbon emission of the system is: wherein: For system annual/lifecycle carbon emissions, Is the direct emission factor of methane combustion, Is biogas amount; is an indirect carbon emission coefficient of power grid electricity purchase, Is the electricity purchasing quantity.
5. 5. The method for safely operating a multi-energy flow coupled sewage treatment energy supply system of claim 1, wherein the system annual/lifecycle load loss risk index is expressed as: wherein: the power supply availability is the index of the annual/life cycle load loss risk of the system; For reliability/power interruption rate, To expect the shortage of power; To be at the moment The N-1 fault or the load shedding power in extreme weather; The total electricity consumption is the total electricity consumption all the year round; To be at the moment Is used for the electric load of the (a); Is a time interval.
6. 6. The method for safely operating a multi-energy flow coupled sewage treatment energy supply system according to claim 1, wherein in the process of solving the comprehensive objective function, when a Benders cut is generated, a 'center' or 'pareto optimal' dual solution is selected from dual polyhedrons to generate a cutting plane, and in the initial stage of iteration, trust domain constraint is added for the change range of configuration variables in a main problem so as to ensure convergence stability.
7. 7. The method of claim 1, wherein the safe operation behavior constraints include a sewage recoverable heat estimation physical model, a heat pump performance and heat supply/refrigeration capacity physical model, a heat pump total heat supply/refrigeration capacity physical model, a photovoltaic unit output physical model, an instantaneous output physical model, a wind power physical model, a biogas output and waste heat physical model, a battery state transfer and constraint physical model, a heat storage tank state transfer physical model and an energy balance physical model.
8. 8. A multi-energy flow coupled sewage treatment energy supply system safety operation device, characterized in that the multi-energy flow coupled sewage treatment energy supply system safety operation method based on any one of claims 1-7 comprises: the objective function construction module is used for constructing a comprehensive objective function by adopting weighted synthesis based on three targets of total cost minimization of the system life cycle, minimization of the carbon emission of the system year/life cycle and the risk index of the system year/life cycle loss load; The system comprises a configuration scheme optimizing module, a main problem solving device configuration scheme and a sub problem optimizing module, wherein the configuration scheme optimizing module is used for solving a comprehensive objective function through safe operation behavior constraint to obtain the configuration scheme of each device in a sewage treatment energy supply system, the original problem of an uncertainty scene is decomposed into a main problem and a plurality of sub problems in the process of solving the comprehensive objective function, the main problem solves the device configuration scheme and transmits the device configuration scheme to each sub problem, the sub problems conduct operation optimization based on given configuration, and operation cost is fed back to the main problem in a Benders cut mode and used for iteratively correcting the configuration scheme.
9. 9. A computer readable storage medium having stored thereon a computer program, which when executed by a processor performs the steps of the method for safely operating a multi-energy flow coupled sewage treatment energy supply system according to any one of claims 1-7.
10. 10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor performs the steps in the method for safely operating a multi-energy flow coupled sewage treatment energy supply system according to any one of claims 1-7 when the program is executed by the processor.

Description

Safe operation method and device of multi-energy-flow-coupled sewage treatment energy supply system Technical Field The invention relates to the technical field of energy supply systems, in particular to a safe operation method and system of a sewage treatment energy supply system with multi-energy flow coupling. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. The sewage treatment plant is an urban key infrastructure, the traditional sewage treatment energy supply system mainly depends on a single power grid for power supply, and the electric charge ratio is 60-90%, and the system is mainly used for links such as sewage lifting, aeration, sludge treatment and the like. Meanwhile, the sewage treatment process contains abundant renewable energy potential, such as sewage heat energy recovery, biogas cogeneration, tail water kinetic energy power generation and integration of distributed photovoltaic and wind power, but the prior art still has significant limitation in realizing multi-energy flow coupling. The existing sewage treatment energy supply system has the following problems that (1) energy input is single, multi-energy flow coupling modeling is insufficient, fossil energy or a single power grid is used as a main material, cooperative utilization of renewable energy sources is ignored, energy utilization efficiency is low, integrated operation of source-network-charge-storage cannot be realized, the existing method is often used for modeling of single energy source type, interaction among energy flows such as electricity-heat-gas-cold and the like is ignored, system optimization result is distorted, and coordinated optimization and operation decision across energy systems cannot be supported. (2) The safety operation evaluation framework is absent, and when the sewage treatment energy supply system faces disturbance such as element faults, power generation, load change and the like, an evaluation mechanism combining steady state and dynamic characteristics is absent, so that a fault propagation path and linkage effect are difficult to quantify, the risk control capability is weak, and the performance verification and quantitative evaluation are incomplete. The existing framework is not fully integrated with actual case data, and is lack of formulated verification on calculation of indexes such as comprehensive energy efficiency ratio (PER), carbon emission reduction benefit, power supply reliability and the like, so that reliable basis cannot be provided for engineering application. Disclosure of Invention In order to solve the technical problems, the invention provides a safe operation method and a safe operation system of a multi-energy flow coupling sewage treatment energy supply system, which can be used for operation scheduling and capacity planning, and provide unified and powerful tool support for decision making of the multi-energy flow system of a sewage treatment plant in different stages and under different targets, and have wide applicability. In order to achieve the above purpose, the present invention adopts the following technical scheme: The first aspect of the invention provides a safe operation method of a multi-energy-flow-coupling sewage treatment energy supply system. In one or more embodiments, a method of safely operating a multi-energy flow coupled sewage treatment energy supply system is provided, comprising: Based on three targets of minimizing total cost of the system life cycle, minimizing carbon emission of the system year/life cycle and losing load risk index of the system year/life cycle, constructing a comprehensive objective function by adopting weighted synthesis; The method comprises the steps of solving a comprehensive objective function by means of safe operation behavior constraint to obtain a configuration scheme of each device in a sewage treatment energy supply system, wherein in the process of solving the comprehensive objective function, an original problem of an uncertainty scene is decomposed into a main problem and a plurality of sub-problems, the main problem solves the device configuration scheme and transmits the main problem to each sub-problem, the sub-problems perform operation optimization based on given configuration, and operation cost is fed back to the main problem in a manner of Benders cut and used for iteratively correcting the configuration scheme. As an alternative to the use of a single-layer polymer,; Wherein: Is the minimum comprehensive evaluation value; 、 And Is the weight; a lifecycle cost reference value for powering a pure electrical network; a annual carbon emission reference value for powering a pure electric network; a maximum interruption rate reference value allowed by industry standards; is the total cost of the life cycle of the system; Carbon emissions for the system year/life cycle; the risk index for system yea