New converter station in the heat pump application – HC net electrical industry
Abstract : This paper introduces the ABB ACS-510 converter for heat application, provide a frequency converter using Modbus bus control method used.
Keywords : The square of the load converter
1 Introduction Heating network Heating Mode with a heating effect, no pollution, thermal stations as the main part of the heating network, heat stations directly affect the level of user-controlled conditions with a warm, thermal energy station is the main part of energy saving of heat, so energy saving thermal stations , safe operation, of great significance.
2 Project Overview Harbin Airport Development Zone Central Heating Project for a total of 120 thermal stations, heating area of about 5,700,000 mm2, the total load of 10000J / H, a web design water temperature 130 ~ 70 , heating means for the hot water heating mode, the main function of heating station for the residents and factory heating, heating station to a network and secondary network for the heat exchanger and the second pressure, the second pressure and Cycle Pump with inverter control, thermal station of the project by ABBACS510 series inverter as a circulating pump and fill the transmission pump stations controlled part of raising the level of heat to achieve energy savings.
3 Process Description The composition of thermal stations [1]: mainly by the heat exchanger, automatic control panel, pump, pump up, communication circuits, such as the photo shows.
Photo thermal thermal station automation and process map
Controlled part of the [2] is mainly composed by a Schneider PLC, it will live and the status of various parameters to the PLC in the acquisition, PLC will collect the data transmitted by ADSL to the dispatch center. Dispatch center will be the user back to the room temperature signal from the control center back to the PLC in the thermal station. To achieve room temperature control based on end-user water temperature and water flow of the second method to achieve thermal stations automatically. Room temperature if the user's compliance issued pursuant to this city to do a temperature curve of heating and outdoor temperature.
4, the functions of thermal stations
Will be a net exchange of heat through the heat exchanger, the secondary network will be sent to individual users of hot water, thermal stations running superiority and inferiority are mainly end-users of the station's interior temperature is heating up the city standards and operating costs of thermal stations, the degree of energy conservation standards, based on the above ways thermal heating station to reconcile the amount of phase modulation combined with qualitative methods to achieve compliance and energy saving heating. Mass transfer (1) is a network of water supply by regulating the flow control valve to control the temperature of secondary water supply network. Quality control transfer method is simple, but the poor level of energy conservation. Volume adjustment (1) is the increase in the frequency control loop pump on the way (3), by regulating the flow of secondary water temperature to ensure end user compliance, the energy saving effect in this way is very good. Our approach is to control the amount of transfer-based optimal control of quality secondary transfer mode, this control mode can save energy 30% per year, through the circulation pump to improve the frequency and fill pump frequency offset (3) the annual water savings of 20% 30%. Heating network to ensure end user compliance and maximum indoor temperature, saving energy, economic benefit is considerable.
5 Circulation Pump Control Circulation pump ABBACS-510 converter which is a square load applications, ACS-510 and its low cost communication with MODBUS, MODBUS bus we use to control the inverter, including the frequency of start, stop and speed AI to set such operational parameters inverter bus passed through the MODBUS PLC, and then it back to the dispatch center by the PLC, control cabinet assembly easy in this way, because the wiring few small auxiliary device failure rate is low, this through the bus control speed AIsubstationof district heat supply network for a given, their accuracy, effectiveness and good.
Station set up two 37kW circulation pump, two pumps to main equipment. Converter using a delayed two.
(1) Frequency debugging Converter J2 is set to "off". Circulating pump is not set to last an address converter.
Through the control panel set 99 set of parameters
9901 set 09902 set to "5" "HAND / AUTO"
9903 Make 3,809,906 set to "1"
9907 set "of 50" 9908 is set to "2900"
9909 is set to "37"
Set the communication settings of 53 group numbers
5302 is set to "2" 5303 Make 9.6kbits / s
5304 set "1" 53 Group PLC parameter settings should be set in the same communication protocol
Here to set "8", "1" "R", addresses set to "1."
98 set of parameters set JZ set to "off"
9802 set to "1" start the standard mod
Inverter and PLC registers the corresponding method of communication
Converter PLC register address corresponding to the given address set Remarks
1102 external control 1 / 2 outside the control options 40 018
1103 outside the control of a given AI 4002 -32676 ~ 32676 reference set 1108
0102 rate of 40 102 0103 output frequency 40 103 0104 Current 40 104 0301 bus status word bit 0 40301 0
Inverter startup method By the PLC to send data to the inverter 4001:
Move 5 to 4001; Delay 100; Move 7 to 4001;
Move 15 to 4001; Move 47 to 4001; Move 101 to 4001; Start time converter, inverter AI4001 by bus to get speed signal. Inverter speed signal from the PLC network according to the second thermal station of secondary water supply and return water pressure or flow control signals to control the flow of supply and return water pressure to achieve real control.
6 up Pump Control Replenishment frequency by ABB ACS-510 3kW Fans Pump load of the inverter, inverter's parameter settings and the replenishment cycle of the pump is very similar, but its address is set to "3", the inverter J2 is set to "on", replenishment Modbus bus converter is the last equipment.
Replenishment rate of the inverter control signals sent by the PLC Converter, "4003", the second network to ensure constant hot water.
7 Conclusion
Increase circulation pump through the heat converter station network to achieve the amount of heat transfer that energy converter ACS-510 (3) the effect was very obvious use of ACS-510 converter converter control supply water to reduce the imbalance heating network water saving . Using ACS-510's to their own bus control inverter modbus running, saving thermal station equipment Investment The use of bus control to reduce the number of external components, reducing
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