A standby and start system suitable for a wind energy direct-drive heat pump unit

Abstract

The application relates to a standby and starting system suitable for a wind energy direct drive heat pump unit; the system comprises an ambient temperature module, a water temperature module, a wind speed module, a rotating speed module, a control unit, a circulating pump, a fan, a crankcase heater, a brake and a clutch; the wind speed module, the ambient temperature module, the water temperature module and the rotating speed module are monitoring units of the system, the monitoring units collect corresponding signals, and the corresponding wind speed, rotating speed and temperature signals are transmitted to the control unit; the control unit controls the fan, the circulating pump, the crankcase heater, the brake and the clutch to start, stop and standby control the wind energy direct drive heat pump. Through the control unit and the monitoring unit, standby energy consumption of the wind energy direct drive heat pump unit can be effectively reduced, and compared with the existing equipment without adopting the scheme, the standby energy consumption can be reduced to below 30% of the original.

Description

Technical Field

[0001] This invention relates to the field of wind energy technology, and in particular to a standby and start-up system suitable for wind-driven direct-drive heat pump units. Background Technology

[0002] Direct-drive wind power heating is an emerging form of wind energy utilization. It allows the mechanical energy generated by wind turbines to be used directly for heating.

[0003] Currently, wind power heating has three directions: wind-driven direct-drive electromagnetic eddy current heating, wind-driven direct-drive stirring heating, and wind-driven direct-drive heat pump heating. The matching of wind turbines and heating equipment is one of the factors restricting the development of wind-driven direct-drive heat pumps. Currently, the hardware matching of wind-driven direct-drive heat pumps all uses a mechanical transmission device to transfer the mechanical energy generated by the wind turbine to the heat pump compressor after a certain speed-increasing ratio. The software adopts a "wind turbine + heat pump" control approach, where heat pump control and fan control are relatively independent, only linked during start-up and shutdown. The wind turbine and heat pump are not controlled as a unified whole. Wind-driven direct-drive heat pump units rely on wind power; after the equipment is started, it must wait until the wind speed meets the requirements before it can truly enter the heating state. After traditional equipment starts up, the circulating pump, evaporator fan, and defrosting function start normally, but at this time, the wind resources may not meet the operating conditions. Using traditional start-up, shutdown, and standby control schemes will result in unnecessary energy consumption. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a standby and start-up system suitable for wind-powered direct-drive heat pump units; and to significantly reduce the power consumption of wind-powered direct-drive heat pump units in standby mode.

[0005] To achieve the above objectives, the present invention provides a standby and start-up system for wind-powered direct-drive heat pump units. The system includes an ambient temperature module, a water temperature module, a wind speed module, a rotation speed module, a control unit, a circulating pump, a fan, a crankcase heater, a brake, and a clutch. The control unit is connected to the ambient temperature module, water temperature module, wind speed module, rotation speed module, circulating pump, fan, crankcase heater, brake, and clutch. The wind speed module, ambient temperature module, water temperature module, and rotation speed module are monitoring units of the system. These monitoring units collect corresponding signals and transmit the corresponding wind speed, rotation speed, and temperature signals to the control unit. The control unit controls the start-up, stop, and standby of the wind-powered direct-drive heat pump by controlling the fan, circulating pump, crankcase heater, brake, and clutch.

[0006] Before the clutch of the wind-powered direct-drive heat pump unit is engaged, it is in standby mode, with only the antifreeze function of the refrigerant oil and water circuit activated, and the start-up preparation monitoring activated. After the fan speed reaches the start-up speed, it enters the start-up state. After entering the start-up state, the control unit transmits a signal to the brake, first releasing the brake, then starting the circulation pump and fan, and turning off the antifreeze functions of the water circuit and refrigerant oil. After the speed reaches the set speed, the clutch is engaged, thus ending the start-up state. The process control is executed by the control unit.

[0007] When the wind-powered direct-drive heat pump unit is in standby mode, it ends automatic defrosting and begins antifreeze treatment of the refrigerant oil and water circuits, as well as monitoring for start-up preparation; the standby state ends when the brake is released.

[0008] After the antifreeze function of the refrigeration oil is activated, the crankcase heater is turned on and the real-time ambient temperature T1 of the ambient temperature module is read. When the ambient temperature T1 is lower than the set ambient temperature, the crankcase heater is turned on. When the ambient temperature T1 is higher than the set ambient temperature, the crankcase heater is turned off. The standby state ends when the brake is released.

[0009] After the water circuit antifreeze begins, the circulation pump is turned on and the pipe water temperature T2 of the water temperature module is read; when the pipe water temperature T2 is greater than the set upper limit of water temperature, the circulation pump is turned off; when the pipe water temperature T2 is less than the lower limit of water temperature, the circulation pump is turned on; when the brake is released, the standby state ends.

[0010] After the start-up preparation monitoring begins, the control unit reads the wind speed from the wind speed module and calculates the arithmetic average V over a set time X seconds. When V is greater than the start-up wind speed Vs, the brake is released and the start-up preparation monitoring ends.

[0011] When the control unit detects that the brake has been released, it turns on the fan and circulation pump and turns off the crankshaft heater, and starts automatic defrosting and automatic yaw. The automatic yaw function allows the equipment's fan wheel to automatically face the wind according to the current wind direction. When the speed reaches the set speed, the clutch engages, the start-up process ends, and the equipment starts running.

[0012] The ambient temperature module is placed outdoors to monitor the current ambient temperature; the water temperature module is placed in water to monitor the current pipe water temperature; and the speed module is installed at the front end of the compressor of the wind-powered direct-drive heat pump unit to monitor the current compressor input speed of the wind-powered direct-drive heat pump unit.

[0013] The crankcase heater is a heating rod installed below the compressor oil level to maintain the temperature of the refrigeration oil; the clutch is used to control the power input to the compressor and is located at the front end of the compressor. Beneficial effects

[0014] This invention, through its control and monitoring units, effectively reduces the standby energy consumption of wind-driven direct-drive heat pump units. Compared to existing equipment that does not employ this solution, this invention can reduce standby energy consumption to less than 30% of the original amount. The hardware modules used in this invention are all commercially available modules, requiring no custom development and reducing hardware development costs. Attached Figure Description

[0015] Figure 1 This is a control architecture diagram of the present invention;

[0016] Figure 2 This is a hardware schematic diagram of the present invention;

[0017] Figure 3 This is a flowchart of the standby method of the present invention;

[0018] Figure 4 This is a flowchart illustrating the antifreeze process for refrigeration oil according to the present invention.

[0019] In the diagram, 1-wind speed module, 2-ambient temperature module, 3-water temperature module, 4-speed module, 5-control unit, 6-fan, 7-circulation pump, 8-crankcase heater, 9-brake, 10-clutch. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] As shown in the figure, the wind speed module (1) is installed on the wind turbine of the wind-driven heat pump unit to monitor the real-time wind speed under the current environment. The ambient temperature module (2) is placed outdoors to monitor the current ambient temperature. The water temperature module (3) is placed in the water to monitor the current pipe water temperature. The speed module (4) is installed at the front end of the compressor of the wind-driven heat pump unit to monitor the current compressor input speed of the wind-driven heat pump unit. The control unit (5) is an integrated module or a collective term for multiple modules that can collect ambient temperature, water temperature, wind speed and control the circulating pump (7), fan (6), crankcase heater (8), brake (9), and clutch (10). The fan (6) is the evaporator fan of the wind-driven heat pump.

[0022] The circulating pump (7) is the circulating water pump of the wind-powered direct-drive heat pump. The crankcase heater (8) is a heating rod installed below the compressor oil level to maintain the temperature of the refrigeration oil. The brake (9) is a braking device used to stop operation. The clutch (10) is located at the front end of the compressor.

[0023] Figure 3This is the flowchart of the standby method in the control method. When the wind-powered direct-drive heat pump unit is in standby mode, automatic defrosting ends, and antifreeze of the refrigerant oil, antifreeze of the water circuit, and monitoring of startup preparation begin. The standby state ends when the brake (9) is released. The control of the process is executed by the control unit (5).

[0024] After the antifreeze function of the refrigeration oil is activated, the crankcase heater (8) is turned on and the real-time ambient temperature T1 of the ambient temperature module (2) is read. When the ambient temperature T1 is less than the set ambient temperature, the crankcase heater (8) is turned on. When the ambient temperature T1 is greater than the set ambient temperature, the crankcase heater (8) is turned off. The standby state ends when the brake (9) is released.

[0025] After the water circuit antifreeze begins, the circulation pump (7) is turned on, and the pipe water temperature T2 of the water temperature module (3) is read. When the pipe water temperature T2 is greater than the set upper limit of water temperature, the circulation pump (7) is turned off. When the pipe water temperature T2 is less than the lower limit of water temperature, the circulation pump (7) is turned on. The standby state ends when the brake (9) is released.

[0026] After the start-up preparation monitoring begins, the control unit (5) reads the wind speed from the wind speed module (1) and calculates the arithmetic average V over a set time X seconds. When V is greater than the start-up wind speed Vs, the brake (9) is released and the start-up preparation monitoring ends. The set time X ranges from 60 seconds to 600 seconds.

[0027] The starting wind speed Vs is not exactly the same when the equipment is running at different ambient temperatures.

[0028] The starting wind speed at the current ambient temperature is determined according to the "Ambient Temperature and Starting Wind Speed ​​Comparison Table".

[0029] The method for establishing the table of ambient temperature and starting wind speed is as follows:

[0030] First, the operating ambient temperature of the equipment is divided into several environmental test temperature nodes at intervals of 5℃ or 10℃.

[0031] Then, tests were conducted at different wind speeds to determine the starting wind speed of the equipment at various temperature points. Based on the test results, an "Ambient Temperature and Starting Wind Speed ​​Comparison Table" was established and stored in the control system.

[0032] The ambient temperature module (2) collects the real-time ambient temperature T1 and automatically sets the starting wind speed according to the "ambient temperature and starting wind speed comparison table" to the starting wind speed corresponding to the test temperature node that is the smallest difference from the current ambient temperature and higher than the current ambient temperature.

[0033] Figure 4This is a flowchart of the start-up method in the control method. When the control unit (5) detects that the brake (9) has been released, it turns on the fan (6), the circulation pump (7), and turns off the crankshaft heater (8), starting automatic defrosting and automatic yaw. The automatic yaw function allows the equipment's wind turbine to automatically face the wind according to the current wind direction. When the speed reaches the set speed, the clutch (10) engages, the start-up process ends, and the equipment starts running.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. The present invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A standby and start-up system for wind-powered direct-drive heat pump units; characterized in that: The system includes an ambient temperature module, a water temperature module, a wind speed module, a rotation speed module, a control unit, a circulating pump, a fan, a crankcase heater, a brake, and a clutch. The control unit is connected to the ambient temperature module, water temperature module, wind speed module, rotation speed module, circulating pump, fan, crankcase heater, brake, and clutch respectively. The wind speed module, ambient temperature module, water temperature module, and rotation speed module are the system's monitoring units. The monitoring units collect corresponding signals and transmit the corresponding wind speed, rotation speed, and temperature signals to the control unit. The control unit controls the fan, circulating pump, crankcase heater, brake, and clutch to perform start-up, stop, and standby control of the wind-powered direct-drive heat pump. Before the clutch of the wind-powered direct-drive heat pump unit is engaged, it is in standby mode, with only the refrigeration oil antifreeze, water circuit antifreeze and start-up preparation monitoring activated. Once the wind speed reaches the starting speed, the system enters the starting state. After entering the starting state, the control unit transmits a signal to the brake, first releasing the brake, then turning on the circulation pump and fan, and turning off the antifreeze functions of the water pipes and the refrigeration oil. After the speed reaches the set speed, the clutch engages, thus ending the starting state. The process control is executed by the control unit.

2. The standby and start-up system for wind-powered direct-drive heat pump units according to claim 1, characterized in that: When the wind-powered direct-drive heat pump unit is in standby mode, it ends automatic defrosting and begins antifreeze treatment of the refrigerant oil and water circuits, as well as monitoring for start-up preparation; the standby state ends when the brake is released.

3. The standby and start-up system for wind-powered direct-drive heat pump units according to claim 2, characterized in that: After the antifreeze function of the refrigeration oil is activated, the crankcase heater is turned on and the real-time ambient temperature T1 of the ambient temperature module is read. When the ambient temperature T1 is lower than the set ambient temperature, the crankcase heater is turned on. When the ambient temperature T1 is higher than the set ambient temperature, the crankcase heater is turned off. The standby state ends when the brake is released.

4. The standby and start-up system for wind-powered direct-drive heat pump units according to claim 2, characterized in that: After the water circuit antifreeze begins, the circulation pump is turned on and the pipe water temperature T2 of the water temperature module is read; when the pipe water temperature T2 is greater than the set upper limit of water temperature, the circulation pump is turned off; when the pipe water temperature T2 is less than the lower limit of water temperature, the circulation pump is turned on; when the brake is released, the standby state ends.

5. The standby and start-up system for wind-powered direct-drive heat pump units according to claim 2, characterized in that: After the start-up preparation monitoring begins, the control unit reads the wind speed from the wind speed module and calculates the arithmetic average V over a set time X seconds. When V is greater than the start-up wind speed Vs, the brake is released and the start-up preparation monitoring ends.

6. The standby and start-up system for wind-powered direct-drive heat pump units according to claim 2, characterized in that: When the control unit detects that the brake has been released, it turns on the fan and circulation pump and turns off the crankcase heater, and starts automatic defrosting and automatic yaw. The automatic yaw function allows the equipment's fan wheel to automatically face the wind according to the current wind direction. When the speed reaches the set speed, the clutch engages, the start-up process ends, and the equipment starts running.

7. The standby and start-up system for wind-powered direct-drive heat pump units according to claim 1, characterized in that: The ambient temperature module is placed outdoors to monitor the current ambient temperature; the water temperature module is placed in water to monitor the current pipe water temperature; and the speed module is installed at the front end of the compressor of the wind-powered direct-drive heat pump unit to monitor the current compressor input speed of the wind-powered direct-drive heat pump unit.

8. The standby and start-up system for wind-powered direct-drive heat pump units according to claim 2, characterized in that: The crankcase heater is a heating rod installed below the compressor oil level to maintain the temperature of the refrigeration oil; the clutch is used to control the power input to the compressor and is located at the front end of the compressor.

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