| Under the double crisis of energy shortage and climate warming,our government promotes energy production and consumption revolution actively.Reducing carbon dioxide emission,increasing energy efficiency,constructing a clean,low-carbon,safe and efficient energy system has become the consensus of the whole society.With the high energy efficiency,reliable energy supply mode and clean energy consumption structure,hybrid CCHP system draws attention from all walks of life,becoming the means of advancing energy production and consumption revolution.This dissertation focuses on the optimal scheduling of hybrid CCHP system,which is a combination of multiple energy sources and combined cooling heating and power system,promoting local consumption of renewable energy and breaking the pattern of"power-only"in traditional power systems.This dissertation mines schedulable resources among energy production,energy storage and energy consumption,enhancing the energy,economic and environmental benefits of system operation comprehensively.Firstly,an energy supply structure of hybrid CCHP system is proposed,at the same time the mathematical model of kinds of energy supply,conversion and storage equipment are established.Secondly,on account of energy-related,economic and environmental index(CEI),a comprehensive evaluation index is defined,using analytic hierarchy process.With CEI as objective function,the research on day-ahead optimal scheduling of hybrid CCHP system is studied.Then,4 energy storage modes are proposed considering the feature of energy storage and consumption,and their operation and maintenance costs in winter and summer are deeply analyzed.Finally,intelligent electrical equipment was introduced into the scheduling framework in the form of schedulable loads to implement demand response.Furthermore,a'Supply-Storage-Demand'integrated scheduling framework of hybrid CCHP system is proposed to conduct multi-objective optimization research.As result,the economic and environmental benefits of system operation are further improved.The researches proposed in the dissertation are summarized as follows:1.An energy supply structure of hybrid CCHP system is proposed.The relationship between electrical efficiency,thermal efficiency and load rate of internal combustion generator is analyzed,and the relationship between COP and load rate of absorption chiller is analyzed.The difference equation model of energy storage equipment is established.The mathematical model of PV,gas boiler and electric chiller are also created.Moreover,the intelligent electrical equipment is abstracted into schedulable load,and its mathematical model is also established.2.Optimal scheduling framework of hybrid CCHP system is proposed.3 evaluation indexes namely primary Energy Saving Rate,operation Cost Saving Rate and CO2 Emission Saving Rate are defined.Then a comprehensive evaluation index is defined,with respect to 3 indexes using analytic hierarchy process,which is used as the objective function of optimal model.An enhanced Genetic algorithm is developed by introducing elite retention and adaptive mechanisms.Compared with traditional'Following Electricity Strategy' and'Following Thermal Strategy'scheduling methods,the energy-related,economic and environmental performance of proposed hybrid CCHP system is analyzed.3.Optimized economic dispatching framework of hybrid CCHP system integrating energy storage is proposed.Then,4 energy storage modes are proposed considering the feature of energy storage and consumption.An optimal scheduling model with the lowest operating and maintenance cost as the objective function is established.The operation and maintenance costs of 4 modes in winter and summer are comparatively analyzed.The simulation result show that battery is more suitable for running in winter,thermal storage equipment is more suitable for running in summer conversely.The hybrid CCHP system integrating energy storage attaches the lowest operation and maintenance cost when battery and thermal storage equipment are both running,the characteristic of peak load shifting is remarkable at the same time.4.Intelligent electrical equipment was introduced into the scheduling framework in the form of schedulable loads to implement demand response.The users are guided to participate in energy dispatching actively through Time-of-use price mechanism.A'Supply-Storage-Demand' integrated scheduling framework of hybrid CCHP system is proposed through integrating renewable energy,CCHP,energy storage system and schedulable loads into a unified scheduling framework.With the lowest operating cost and the lowest carbon dioxide emission as objective functions,the multi-objective optimization of'Supply-Storage-Demand'integrated scheduling is studied.As result,the economic and environmental benefits of system operation are further improved,and reliability of energy supply is enhanced. |
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