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| Symbol | Meaning |
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| Total system annual cost |
| Annual investment cost of each component equipment in multienergy microgrid |
| Operation and maintenance cost of each component equipment in multienergy microgrid |
| Carbon intensity of the system |
| Intensity of carbon emissions contained in the energy produced by the multienergy microgrid |
| Intensity of carbon emissions included in the externally purchased energy of a multienergy microgrid |
| Equivalent annuity fund recovery factor for CHP (combined heat and power) |
| Equivalent annuity fund recovery factor for absorption refrigerators |
| Equivalent annuity fund recovery factor for heat pump |
| Equivalent annuity fund recovery factor for distributed photovoltaics |
| Equivalent annuity fund recovery factor for distributed fans |
| Equivalent annuity fund recovery factor for gas boilers |
| Equivalent annuity fund recovery factor for CSP |
| Equivalent annuity fund recovery factor for electric energy storage |
| Equivalent annuity fund recovery factor for thermal storage equipment and heat pipe network equipment |
| A collection of optional access devices in a multienergy microgrid |
| CHP fixed construction cost |
| Variable cost of CHP as construction capacity changes |
| 0-1 decision variables for k equipment investment construction |
| CHP investment construction capacity |
| Investment capacity of absorption refrigerator |
| Heat pump investment capacity |
| Distributed photovoltaic investment capacity |
| Distributed fan investment capacity |
| Gas boiler investment capacity |
| k equipment investment capacity |
| Photothermal construction area |
| Investment cost per unit capacity/area of absorption refrigerator |
| Investment cost per unit capacity/area of heat pump |
| Investment cost per unit capacity/area of distributed photovoltaic |
| Investment cost per unit capacity/area of distributed fans |
| Investment cost per unit capacity/area of gas boiler |
| Investment cost per unit capacity/area of photothermal |
| Investment cost per unit capacity/area of electric energy storage |
| Investment cost per unit capacity/area of thermal storage equipment |
| Length of heating pipe to be laid from node i to node j |
| A 0-1 decision variable for laying a heating pipeline to node j with node i as the upstream supply node |
| Probability of planning scene |
| Represents the natural gas price at time t in the planning scene |
| Represents the day-to-day electricity price at time t in the planning scene |
| CHP gas consumption at time t in the planning scene |
| Natural gas consumption of the gas boiler at time t in the planning scene |
| Electricity purchased by multienergy microgrid from main net |
| Electricity sold by multienergy microgrid to main net |
| Maintenance cost per unit capacity/area of CHP |
| Maintenance cost per unit capacity/area of absorption refrigerator |
| Maintenance cost per unit capacity/area of heat pump |
| Maintenance cost per unit capacity/area of distributed photovoltaic |
| Maintenance cost per unit capacity/area of distributed fans |
| Maintenance cost per unit capacity/area of gas boiler |
| Maintenance cost per unit capacity/area of photothermal |
| Maintenance cost per unit capacity/area of electric energy storage |
| Maintenance cost per unit capacity/area of thermal storage equipment |
| CHP actual power output at a certain moment |
| Actual power output of distributed fans at a certain moment |
| Actual heat output of gas boiler at a certain moment |
| Absorption refrigerator consumption heat at some point |
| Heat pump actual consumption of electricity at a certain moment |
| Amount of electrical and thermal energy actually stored by electricity storage at a time |
| The capacity of the k equipment device with the indicated ordinal number |
| Amount of electrical and thermal energy actually stored by the thermal storage device at a certain moment |
| Intensity of carbon emissions per cubic meter of natural gas |
| Intensity of carbon emissions contained in the electricity purchased per unit of the main network |
| Distributed photovoltaic output at node i at time t in the planning scene |
| Discharge power of the electric energy storage device at node i in t period under planning scene |
| Charging power of the electric energy storage device at node i in t period in the planning scene |
| Main network input power of node i at time t in the planning scene |
| Power that node i supplies to the main network during time t in the planning scene |
| Electrical power from node j to node i during t in the planning scene |
| Electric power injected from node i to node j during t in the planning scene |
| Set of nodes connected to node i |
| Comprehensive line loss rate in an area |
| Thermal power of CHP at node i during t in the planning scene |
| Thermal power of the photothermal device at node i during t in the planning scene |
| Exothermic power of the heat storage device at node i at time t in the planning scene |
| Thermal storage power of thermal storage equipment at node i in t period under planning scene |
| Thermal power of heat pump at node i in t period in the planning scene |
| The thermal power injected by node j to node i during t period in the planning scene |
| The thermal power injected by node i to node j during t period in the planning scene |
| The electrical load demand of node i during t in the planning scene |
| The cooling load demand of node i during t in the planning scene |
| The size of the hot water heating load of node i during t in the planning scene |
| The size of the other heat load requirements for node i during t in the planning scene |
| Heat loss per unit length of heat pipe |
| The cooling power of the heat pump at node i during t in the planning scene |
| The cooling power of the retractable refrigerator at node i in t period in the planning scene |
| A 0-1 decision variable representing investment in heat pump at node i |
| A 0-1 decision variable representing the investment in an absorption refrigerator at node i |
| Upper limit of k equipment investment capacity on a single node |
| Lower limit of k equipment investment capacity on a single node |
| Electric conversion efficiency of CHP |
| CHP thermal conversion efficiency |
| The charging efficiency of electric energy storage equipment |
| Discharge efficiency of electric energy storage equipment |
| Thermal storage efficiency of thermal storage equipment |
| Heat release efficiency of thermal storage equipment |
| A 0-1 variable, indicating whether there is a distributed fan installation condition at node i |
| Wind speed at node i at time t in the planning scene |
| vci | Cut-in wind speed of the fan |
| vrat | Fan rated wind speed |
| vco | Cut-out wind speed of the fan |
| Photovoltaic installed capacity per unit area at node i |
| Light radiation intensity at node i at time t in the planning scene |
| Rated light radiation intensity of distributed photovoltaic equipment |
| Rated light radiation intensity of distributed wind-heating equipment |
| Distributed photovoltaic power generation and heating efficiency coefficient |
| Solar thermal equipment power generation and heating efficiency coefficient |
| A 0-1 variable representing the investment decision of the heat pump at node i |
| A 0-1 variable |
| A 0-1 variable |
| Upper limit investment capacity of heat pump on a single node |
| The heating efficiency coefficient of the heat pump |
| The cooling efficiency coefficient of a heat pump |
| Efficiency coefficient of absorption refrigerator |
| Combustion efficiency coefficient of gas boiler |
| CHP selectable device ordinal number |
| Heat pump selectable equipment ordinal number |
| Ordinal number of optional equipment for absorption refrigerator |
| Ordinal number of optional equipment for gas boiler |
| CHP selectable device ordinal number |
| Ordinal number of optional equipment for absorption refrigerator |
| Indication ordinal number of optional equipment for gas boiler |
| A 0-1 decision variable, indicating whether to choose to install CHP with ordinal number at node i |
| Indicates the device capacity of the selected device ordinal number at node i |
| Indicates the device capacity of the selected device ordinal number at node i |
| Device capacity representing the selected device ordinal number at node i |
| The device capacity of the selected device ordinal number at node i |
| The power output of the CHP with the ordinal number of the device selected at node i in period t in the planning scene |
| The heat consumption of the absorption refrigerator with the ordinal number of the equipment selected at node i in period t in the planning scene |
| Heating quantity of gas boiler representing the ordinal number of equipment selected at node i in period t in the planning scene |
| The power consumption of the heat pump with the ordinal number selected at node i in period t in the planning scene |
| The thermal output of the CHP with the ordinal number of device at node i in period t in the planning scene |
| The heat supply of the heat pump with node ordinal number at node i in period t in the planning scene |
| Represents the cooling capacity of the heat pump with the ordinal number of device at node i in period t in the planning scene |
| The cooling capacity of the absorption refrigerator with node ordinal number at node t in the planning scene |
| The capacity of the heat pump with the ordinal number |
| A 0-1 variable indicating whether or not to choose to install the indicator with the ordinal number at node i |
| A 0-1 variable indicating whether or not to choose to install the indicator with the ordinal number at node i |
| The capacity of the heat pump with the ordinal number |
| A 0-1 variable indicating whether or not to choose to install the indicator with the ordinal number at node i |
| A 0-1 variable for decision whether to choose installation instruction at node i for gas boiler with the ordinal number |
| The thermal power injected by node j to node i during t period in the planning scene |
| Symbol | Meaning |
| The thermal power injected by node j to node i during t period in the planning scene |
| The thermal power injected by node i to node j during t period in the planning scene |
| The electrical load demand of node i during t in the planning scene |
| The cooling load demand of node i during t in the planning scene |
| The size of the hot water heating load of node i during t in the planning scene |
| The size of the other heat load requirements for node i during t in the planning scene |
| Heat loss per unit length of heat pipe |
| The cooling power of the heat pump at node i during t in the planning scene |
| The cooling power of the retractable refrigerator at node i in t period in the planning scene |
| A 0-1 decision variable representing investment in heat pump at node i |
| A 0-1 decision variable representing the investment in an absorption refrigerator at node i |
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