CN111555285A - Energy flow decoupling analysis and calculation method for distributed combined cooling heating and power comprehensive energy system - Google Patents
Energy flow decoupling analysis and calculation method for distributed combined cooling heating and power comprehensive energy system Download PDFInfo
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Abstract
A decoupling analysis calculation method for energy flow of distributed combined cooling heating power supply comprehensive energy system comprises a cooling/heating/power grid and auxiliary electrical equipment, a combined cooling heating power supply distributed power supply, and independent electric refrigeration/heating equipment, wherein the voltage amplitude and phase angle of the connection point of the known comprehensive energy grid and an external power grid, and other power load powers of each node of the power supply grid except the electric refrigeration/heating equipment and the auxiliary electrical equipment of the cooling/heating grid, the method comprises the steps of obtaining the power generation power of each distributed power supply, the supply/return temperature of the node where the cold/heat cogeneration distributed power supply is located in the cold/heat supply network, the total cold/heat load power needed by each node of the cold/heat supply network and the network characteristic parameters of the cold/heat/power supply network, and solving the voltage and line power of each node of the power supply network, the cold/heat power of each node of the cold/heat supply network and the power consumption power of auxiliary electric equipment in the comprehensive energy system. The energy flow analysis and calculation method provided by the invention is more suitable for the requirements of practical application scenes, and the algorithm is simple and easy to understand and has high solving speed.
Description
Technical Field
The invention relates to the field of combined cooling heating and power comprehensive energy systems, in particular to a decoupling analysis calculation method for energy flow of a distributed combined cooling heating and power comprehensive energy system.
Background
Distributed power supplies such as a cogeneration gas turbine, a fuel cell and the like are combined with waste heat utilization refrigerating/heating devices such as a heat pump air conditioner, an absorption refrigerating device, a heat exchanger and the like, and an active microgrid containing wind, light and storage gradually develops towards a distributed combined cooling heating and power comprehensive energy system. The comprehensive energy system can not only provide electric power, but also meet the local cold/heat load requirements, the cascade utilization of energy realizes the efficient conversion and utilization of primary energy, improves the reliability of the energy system, and has good social, economic and environmental benefits. The combined cooling heating and power comprehensive energy system is widely applied to the energy supply aspect of emerging industrial parks, and the application field of the combined cooling heating and power comprehensive energy system can be continuously widened along with the reduction of the system cost and the increase of the southern distributed heat supply requirement.
Since the long-distance transmission loss of cold/hot water or steam is very large, the range of the distributed combined cooling heating and power comprehensive energy system is generally equivalent to that of the traditional power supply and distribution system, for example: industrial parks, communities, school districts, communities, and the like. The energy of the distributed integrated energy system mainly comes from an external public power grid and natural gas, and meanwhile, the distributed integrated energy system may have a certain electric energy, natural gas or cold/heat energy storage capacity. The cold/heat energy of the user side can be directly converted from the electric power, and can also be obtained by utilizing the waste heat of a distributed power supply with the combined cold and heat and power capacity, such as a gas turbine, a fuel cell and the like. As the cost of the cooling/heating equipment is gradually reduced, the cost of fuel or electric energy becomes a main expenditure of the cooling/heating system, and the function or performance of a part of the equipment is limited, and it is more and more common for a user side to install different types of cooling/heating equipment simultaneously to meet the total cooling/heating requirement. No matter what way the cold/heat load demand is met, the total demand of the user for the cold/heat energy is the same, if the output of the combined cooling, heating and power distributed power supply is increased, the electric power required by electric refrigeration and electric heating is reduced, and vice versa, that is, a stronger coupling relationship exists between heat and electricity, and the coupling relationship has a larger influence on the power flow of the power grid.
The energy flow analysis of the system can be used for reference of a power flow calculation method of a thermoelectric combination system, and currently, the system mainly comprises three genres of a combination solution, a thermoelectric system iteration solution and a decoupling solution. Considering the access of a distributed power supply and the existence of PV nodes, a Newton-Raphson method is generally recommended for the load flow calculation of an active micro-grid or a power distribution network, and in addition, a Newton-Raphson method is also adopted for solving a nonlinear mathematical model of a thermal system. The existing solving method has the following problems: (1) whether the combined solution or the iterative solution is adopted, the algorithm is very complex, the convergence is poor, and the solution speed is slow; (2) when the load of a power grid is large and lines among nodes are short, the Newton-Raphson method may not be capable of solving; (3) the traditional large thermodynamic system usually adopts a mode of 'fixing power by heat', and a solving method of a mathematical model is not suitable for a comprehensive energy system, because a distributed power supply for combined cooling, heating and power and a conventional thermal power unit have larger difference, especially a fuel cell; (4) the coupling relationship between the combined cooling heating and power distributed power supply and the independent electric cooling/heating equipment (such as an air conditioner and a water heater) and the application scene of the distributed cooling/heating are not considered.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an energy flow decoupling analysis and calculation method of a distributed combined cooling heating and power comprehensive energy system. The decoupling solution strategy between the cold and heat power systems is designed according to known parameters of the system by considering that the integrated energy system has a coupling relation among the cold, heat and power combined supply distributed power nodes, the auxiliary electrical equipment of the cooling/heating network and the cold and heat load nodes, and the cold, heat and power combined supply distributed power usually adopts an operation mode of 'fixing heat by electricity'. Considering that the comprehensive energy network is connected to an external public power grid to operate, the radial power supply network can adopt a forward-backward substitution method to carry out load flow calculation. Through the technical improvement, for a common distributed combined cooling heating and power comprehensive energy system, the energy flow analysis and calculation method provided by the invention is more in line with the requirements of practical application scenes, and the algorithm is simple and easy to understand and has high solving speed.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an energy flow decoupling analysis and calculation method of a distributed combined cooling heating and power comprehensive energy system comprises the following steps:
step S1, collecting known data including system parameters and partial operation variables based on the comprehensive energy system model structure;
step S2, analyzing the output waste heat power of the combined cooling heating and power distributed power supply in the 'electricity constant heating' operation mode;
step S3, determining the cooling/heating power of each node of the cooling/heating network and the power consumption of the auxiliary electrical equipment;
step S4, judging whether the cooling/heating power of each node of the cooling/heating network is larger than the total cooling/heating load power required by the node, if so, re-entering the step S2 after the operation point of the combined cooling heating and power distributed power supply needs to be adjusted, and if not, entering the next step;
step S5, calculating the cold and hot load power which needs to be supplemented by the electric cooling/heating equipment, namely, the total cold/hot load power needed by each node is subtracted by the cold/hot power provided by the cooling/heating network of the node acquired in the step S3;
step S6, determining the power consumption of the electric cooling/heating equipment according to the cold/heat load power which is acquired in step S5 and needs to be supplemented;
step S7, calculating the total power load power of each node of the power supply network, wherein the power load comprises electric cooling/heating equipment, auxiliary electric equipment of the cooling/heating network and other known power loads;
and step S8, determining the voltage of each node and the line power of the power supply network through load flow calculation according to the known voltage amplitude and phase angle of the connection point of the power supply network and the external power grid, the generated power of the distributed power supply and the total power of the power loads of each node determined after the power is supplemented in the step S7 based on the structure and parameters of the power supply network.
Further, in step S2, the output waste heat power of the combined cooling heating and power system in the "constant heating with electricity" operation mode may be obtained through detailed system modeling analysis of the distributed power supply, or may be solved by the following simplified formula:
ΦDG＝PDGCDG
in the formula phiDG、PDGAnd CDGThe output waste heat power, the power generation output power and the thermoelectric proportional factor of the combined cooling heating and power distributed power supply are respectively provided.
Still further, in step S3, the solution of the cooling/heating power of each node of the cooling/heating network may be implemented by detailed modeling of the cooling/heating network, that is: and analyzing and calculating the supply/return temperature and the pipeline flow of each node of the cooling/heating network based on the demand range of the combined cooling heating and power distributed power supply for the supply temperature and the return temperature of the waste heat outlet according to the structure and the parameters of the cooling/heating network, and then calculating the cooling/heating power corresponding to the node according to the supply/return temperature and the pipeline flow of each node of the cooling/heating network.
Still further, in the step S6, the determination of the power consumption of the electric cooling/heating device may adopt a conventional energy efficiency coefficient method, that is:
PEL＝ΦEL/ηEL
in the formula, PEL、ΦELAnd ηELRespectively the electricity consumption power, the refrigeration/heat output power and the electric heat conversion efficiency of the electric refrigeration/heat equipment.
Furthermore, in step S8, the node voltages and line powers of the power supply network are determined through load flow calculation, and when the power supply network is a radial network and is connected to an external public large power grid, a conventional push-back substitution method is adopted, and the steps are as follows:
step S801, setting initial voltage values of nodes of a power supply network;
step S802, according to the voltage value and the total load power of each node of the power supply network, the power of each line is pushed forward from the tail end of the power supply network to the public large power grid access end;
step S803, according to the voltage amplitude and phase angle of the public large power grid end accessed by the power supply network and the line power obtained in step S802, the voltage value of each node is solved back to the end of the power supply network;
step S804, determining whether the convergence index after the previous push-back generation meets the requirement, if yes, outputting the voltage and line power results of each node, and if not, returning to step S802 to continue iterative computation.
The invention has the following beneficial effects: the invention provides an energy flow decoupling analysis calculation method of a distributed combined cooling heating and power comprehensive energy system, aiming at the application situation that the distributed combined cooling heating and power and independent electric refrigeration/heat equipment meet the cooling/heating requirements of users together. When the method is used for energy flow analysis, repeated iterative calculation between the power supply system and the cooling/heating system is not needed, and the cooling/heating system and the power supply system are solved in sequence to obtain results. In addition, the cooling, heating and power combined supply distributed power supply adopts an operation mode of electricity for heat fixation, and meets the cooling/heating requirements of users together under the coordination of independent electric refrigeration/heating equipment, so that the solution of a cooling/heating system is greatly simplified; when the power supply system is connected to an external public power grid, the distributed power supply usually adopts a constant output power operation mode, and combines with the electric power utilization result of the coupled electrical equipment obtained by solving the cooling/heating system, so that the solving of the power supply system can also adopt a conventional and simple forward-backward substitution method. Therefore, the technical scheme of the invention avoids the problem that the power supply system and the cooling/heating system repeatedly iterate for many times in the existing combined solution of the thermal-electric system and the problem that a complex but not very applicable Newton-Raphson method is required to be adopted when the power supply system and the cooling/heating system are independently solved. The energy flow analysis and calculation method provided by the invention is more in line with the requirements of practical application scenes, and the algorithm is simple and easy to understand and has high solving speed.
Drawings
Fig. 1 is a schematic diagram of a coupling relationship of a distributed combined cooling heating and power integrated energy system.
Fig. 2 is an energy flow analysis flow chart of the distributed combined cooling heating and power comprehensive energy system.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 and 2, an energy flow decoupling analysis calculation method of a distributed combined cooling heating and power comprehensive energy system includes the following steps:
step S1, collecting known data including system parameters and partial operation variables based on the comprehensive energy system model structure;
step S2, analyzing the output waste heat power of the combined cooling heating and power distributed power supply in the 'electricity constant heating' operation mode;
the output waste heat power of the combined cooling heating and power distributed power supply in the 'electricity constant heat' operation mode can be obtained through detailed system modeling analysis of the distributed power supply, and can also be solved by adopting the following simplified formula, namely:
ΦDG＝PDGCDG
in the formula phiDG、PDGAnd CDGRespectively providing the output waste heat power, the power generation output power and the thermoelectric proportional factor of the combined cooling heating and power distributed power supply;
step S3, determining the cooling/heating power of each node of the cooling/heating network and the power consumption of the auxiliary electrical equipment;
the solution of the cooling/heating power of each node of the cooling/heating network can be realized by detailed modeling of the cooling/heating network, namely: analyzing and calculating the supply/return temperature and the pipeline flow of each node of the cooling/heating network based on the demand range of the combined cooling heating and power distributed power supply for the supply temperature and the return temperature of the waste heat outlet according to the structure and the parameters of the cooling/heating network, and then calculating the cooling/heating power corresponding to the node according to the supply/return temperature and the pipeline flow of each node of the cooling/heating network;
step S4, judging whether the cooling/heating power of each node of the cooling/heating network is larger than the total cooling/heating load power required by the node, if so, re-entering the step S2 after the operation point of the combined cooling heating and power distributed power supply needs to be adjusted, and if not, entering the next step;
step S5, calculating the cold and hot load power which needs to be supplemented by the electric cooling/heating equipment, namely, the total cold/hot load power needed by each node is subtracted by the cold/hot power provided by the cooling/heating network of the node acquired in the step S3;
step S6, determining the power consumption of the electric cooling/heating equipment according to the cold/heat load power which is acquired in step S5 and needs to be supplemented;
the determination of the power consumption of the electric cooling/heating device can adopt a conventional energy efficiency coefficient method, namely:
PEL＝ΦEL/ηEL
in the formula, PL、ΦELAnd ηELRespectively the electricity consumption power, the refrigeration/heat output power and the electric heat conversion efficiency of the electric refrigeration/heat equipment;
step S7, calculating the total power load power of each node of the power supply network, wherein the power load comprises electric cooling/heating equipment, auxiliary electric equipment of the cooling/heating network and other known power loads;
step S8, based on the structure and parameters of the power supply network, determining the voltage and line power of each node of the power supply network through load flow calculation according to the known voltage amplitude and phase angle of the connection point with the external power grid, the generated power of the distributed power supply and the total power of the power load of each node determined after being supplemented by the step S7;
in step S8, the node voltages and line powers of the power supply network are determined through load flow calculation, and when the power supply network is a radial network and is connected to an external public large power grid, a conventional forward-backward substitution method is adopted, and the steps are as follows:
step S801, setting initial voltage values of nodes of a power supply network;
step S802, according to the voltage value and the total load power of each node of the power supply network, the power of each line is pushed forward from the tail end of the power supply network to the public large power grid access end;
step S803, according to the voltage amplitude and phase angle of the public large power grid end accessed by the power supply network and the line power obtained in step S802, the voltage value of each node is solved back to the end of the power supply network;
step S804, determining whether the convergence index after the previous push-back generation meets the requirement, if yes, outputting the voltage and line power results of each node, and if not, returning to step S802 to continue iterative computation.
Claims (5)
1. An energy flow decoupling analysis and calculation method of a distributed combined cooling heating and power comprehensive energy system is characterized by comprising the following steps of:
step S1, collecting known data including system parameters and partial operation variables based on the comprehensive energy system model structure;
step S2, analyzing the output waste heat power of the combined cooling heating and power distributed power supply in the 'electricity constant heating' operation mode;
step S3, determining the cooling/heating power of each node of the cooling/heating network and the power consumption of the auxiliary electrical equipment;
step S4, judging whether the cooling/heating power of each node of the cooling/heating network is larger than the total cooling/heating load power required by the node, if so, re-entering the step S2 after the operation point of the combined cooling heating and power distributed power supply needs to be adjusted, and if not, entering the next step;
step S5, calculating the cold and hot load power which needs to be supplemented by the electric cooling/heating equipment, namely, the total cold/hot load power needed by each node is subtracted by the cold/hot power provided by the cooling/heating network of the node acquired in the step S3;
step S6, determining the power consumption of the electric cooling/heating equipment according to the cold/heat load power which is acquired in step S5 and needs to be supplemented;
step S7, calculating the total power load power of each node of the power supply network, wherein the power load comprises electric cooling/heating equipment, auxiliary electric equipment of the cooling/heating network and other known power loads;
and step S8, determining the voltage of each node and the line power of the power supply network through load flow calculation according to the known voltage amplitude and phase angle of the connection point of the power supply network and the external power grid, the generated power of the distributed power supply and the total power of the power loads of each node determined after the power is supplemented in the step S7 based on the structure and parameters of the power supply network.
2. The method for decoupling, analyzing and calculating the energy flow of the distributed combined cooling heating and power comprehensive energy system according to claim 1, wherein in step S2, the output waste heat power of the combined cooling heating and power distributed power supply in the "constant heating with electricity" operation mode can be obtained by detailed system modeling analysis of the distributed power supply, or can be solved by the following simplified formula:
ΦDG＝PDGCDG
in the formula phiDG、PDGAnd CDGThe output waste heat power, the power generation output power and the thermoelectric proportional factor of the combined cooling heating and power distributed power supply are respectively provided.
3. The method for energy flow decoupling analysis and calculation of a distributed combined cooling heating and power comprehensive energy system according to claim 1 or 2, wherein in the step S3, the solution of the cooling/heating power of each node of the cooling/heating network can be realized by detailed modeling of the cooling/heating network, that is: and analyzing and calculating the supply/return temperature and the pipeline flow of each node of the cooling/heating network based on the demand range of the combined cooling heating and power distributed power supply for the supply temperature and the return temperature of the waste heat outlet according to the structure and the parameters of the cooling/heating network, and then calculating the cooling/heating power corresponding to the node according to the supply/return temperature and the pipeline flow of each node of the cooling/heating network.
4. The energy flow decoupling analysis and calculation method of the distributed combined cooling heating and power comprehensive energy system according to claim 1 or 2, wherein in the step S6, the determination of the power consumption of the electric refrigeration/heating equipment may adopt a conventional energy efficiency coefficient method, that is:
PEL＝ΦEL/ηEL
in the formula, PEL、ΦELAnd ηELRespectively the electricity consumption power, the refrigeration/heat output power and the electric heat conversion efficiency of the electric refrigeration/heat equipment.
5. The method for decoupling, analyzing and calculating the energy flow of the distributed combined cooling heating and power comprehensive energy system according to claim 1 or 2, wherein in the step S8, the voltage of each node and the line power of the power supply network are determined through power flow calculation, and when the power supply network is a radial network and is connected to an external public large power grid, a conventional forward-backward substitution method is adopted, and the steps are as follows:
step S801, setting initial voltage values of nodes of a power supply network;
step S802, according to the voltage value and the total load power of each node of the power supply network, the power of each line is pushed forward from the tail end of the power supply network to the public large power grid access end;
step S803, according to the voltage amplitude and phase angle of the public large power grid end accessed by the power supply network and the line power obtained in step S802, the voltage value of each node is solved back to the end of the power supply network;
step S804, determining whether the convergence index after the previous push-back generation meets the requirement, if yes, outputting the voltage and line power results of each node, and if not, returning to step S802 to continue iterative computation.
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| CN112699513A (en) * | 2020-12-22 | 2021-04-23 | 广东电网有限责任公司广州供电局 | Robust state estimation method and device for comprehensive energy system |
| CN112906220A (en) * | 2021-02-10 | 2021-06-04 | 海南省电力学校(海南省电力技工学校) | Method for estimating state of comprehensive energy microgrid park system |
| CN114779750A (en) * | 2022-06-21 | 2022-07-22 | 成都安美科燃气技术股份有限公司 | Control method for determining power by heat for gas internal combustion engine combined heat and power unit |
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| CN112906220A (en) * | 2021-02-10 | 2021-06-04 | 海南省电力学校(海南省电力技工学校) | Method for estimating state of comprehensive energy microgrid park system |
| CN114779750A (en) * | 2022-06-21 | 2022-07-22 | 成都安美科燃气技术股份有限公司 | Control method for determining power by heat for gas internal combustion engine combined heat and power unit |
| CN114779750B (en) * | 2022-06-21 | 2022-11-11 | 成都安美科燃气技术股份有限公司 | Control method for determining power by heat for gas internal combustion engine combined heat and power unit |
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