Power supply control method and device for tested assembly

Abstract

The invention relates to a power supply control method and device for a tested assembly. The power supply control method for the tested assembly comprises the following steps: acquiring a level state of a feedback contact of an electrical switch in the tested assembly; and based on the level state of a feedback contact of an electrical switch in the tested assembly, a power transmission contactor connected between a power supply for supplying power to the tested assembly and the tested assembly is switched off or switched on, so as to cut off or supply power to the tested assembly. According to the invention, automation of power operation of power-on and power-off can be realized, so that the safety of the system and personnel is ensured.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wind power generation, and more specifically, to a power supply control method and device for a tested assembly. Background Art

[0002] Electric shock accidents can cause current to pass through the human body, causing harm to the human body. Mild electric shock may cause burns at the contact point, while severe electric shock may cause respiratory depression, cardiac arrest, and even directly endanger life. Electric shock accidents often occur due to a lack of safety awareness (for example, contacting the power supply without confirming whether the power supply is off) or performing operations without understanding electrical safety operating procedures. In addition, when testing wind turbines, since there are many signals and actuators that need to be tested and the configurations of wind turbines of different models are different, there are times when the cables need to be removed (or there are no installation points). At this time, if the cables are exposed, leakage or electric shock accidents may occur due to adhesion of the relay. Summary of the invention

[0003] In order to solve the above problems, the present disclosure proposes a power supply control method and device for an assembly under test, a computing system, and a computer-readable storage medium.

[0004] According to one aspect of the present disclosure, a power supply control method for an assembly under test is provided, the power supply control method for the assembly under test comprising: obtaining the level state of a feedback contact of an electrical switch in the assembly under test; based on the level state of the feedback contact of the electrical switch in the assembly under test, disconnecting or connecting a power supply contactor connected between a power supply for powering the assembly under test and the assembly under test, so as to power off or power on the assembly under test.

[0005] Optionally, the assembly under test includes a nacelle of a wind turbine generator set, and based on the level state of the feedback contacts of the electrical switches in the assembly under test, the step of disconnecting or connecting the power supply contactor connected between the power supply for powering the assembly under test and the assembly under test to cut off power or power on the assembly under test includes: in response to a power supply request from the assembly under test and the level states of the feedback contacts of all the electrical switches in the assembly under test being low, connecting the power supply contactor to power the assembly under test.

[0006] Optionally, based on the level state of the feedback contacts of the electrical switches in the assembly under test, the step of disconnecting or connecting the power supply contactor connected between the power supply for powering the assembly under test and the assembly under test to power off or power on the assembly under test also includes: in response to a power-off request of the assembly under test, the level states of the feedback contacts of all the electrical switches in the assembly under test are low and the switch control signals sent to all the electrical switches are low, disconnecting the power supply contactor to power off the assembly under test.

[0007] Optionally, the assembly under test includes an impeller of a wind turbine generator set, and based on the level state of the feedback contacts of the electrical switch in the assembly under test, the step of disconnecting or connecting the power supply contactor connected between the power supply for powering the assembly under test and the assembly under test to power off or power on the assembly under test includes: in response to the power supply request of the assembly under test and the level state of the feedback contacts of the pitch capacitor switch in the assembly under test being low, connecting the power supply contactor to power the assembly under test.

[0008] Optionally, based on the level state of the feedback contacts of the electrical switch in the assembly under test, the step of disconnecting or connecting the power supply contactor connected between the power supply for powering the assembly under test and the assembly under test to power off or power on the assembly under test also includes: in response to the power-off request of the assembly under test, the level states of the feedback contacts of the pitch capacitor switch in the assembly under test are all low and the pitch speed is zero, disconnecting the power supply contactor to power off the assembly under test.

[0009] Optionally, based on the level state of the feedback contacts of the electrical switches in the assembly under test, the step of disconnecting or connecting the power supply contactor connected between the power supply for powering the assembly under test and the assembly under test to power off or power on the assembly under test includes: in response to the switch control signals sent to all electrical switches in the assembly under test being at a low level and the level state of the feedback contacts of at least one electrical switch in the assembly under test being at a high level, disconnecting the power supply contactor to power off the assembly under test, and issuing an alarm message for the at least one electrical switch.

[0010] According to another aspect of the present disclosure, there is provided a power supply control device for an assembly under test, the power supply control device for the assembly under test comprising: a communication unit, which is communicatively connected to the assembly under test and is used to obtain the level state of feedback contacts of an electrical switch in the assembly under test; and a power supply control unit, which is used to disconnect or connect a power supply contactor connected between a power supply for powering the assembly under test and the assembly under test based on the level state of the feedback contacts of the electrical switch in the assembly under test, so as to power off or power on the assembly under test.

[0011] Optionally, the assembly under test includes a nacelle of a wind turbine generator set, and the power supply control unit is configured to: in response to a power supply request from the assembly under test and the level states of the feedback contacts of all electrical switches in the assembly under test being low, turn on the power supply contactor to supply power to the assembly under test.

[0012] Optionally, the power supply control unit is configured to: in response to a power-off request of the assembly under test, the level states of the feedback contacts of all electrical switches in the assembly under test are all low and the switch control signals sent to all electrical switches are all low, disconnect the power supply contactor to cut off the power to the assembly under test.

[0013] Optionally, the assembly under test includes an impeller of a wind turbine generator set, and the power supply control unit is configured to: in response to a power supply request from the assembly under test and the level state of the feedback contacts of the pitch capacitor switch in the assembly under test being a low level, turn on the power supply contactor to supply power to the assembly under test.

[0014] Optionally, the power supply control unit is configured to: in response to a power-off request of the assembly under test, the level states of the feedback contacts of the pitch capacitor switch in the assembly under test are all low and the pitch speed is zero, disconnect the power supply contactor to cut off power to the assembly under test.

[0015] Optionally, the power supply control unit is configured to: in response to the switch control signals sent to all electrical switches in the assembly under test being at a low level and the level state of the feedback contact of at least one electrical switch in the assembly under test being at a high level, disconnect the power supply contactor to cut off power to the assembly under test, and issue an alarm message for the at least one electrical switch.

[0016] According to another aspect of the present disclosure, a test platform for a wind turbine generator set is provided, the test platform comprising: a power supply contactor connected between a power supply for supplying power to the assembly under test and the assembly under test; and a controller configured to execute the power supply control method for the assembly under test as described above.

[0017] According to another aspect of the present disclosure, a computing system is provided that includes at least one computing device and at least one storage device storing instructions, wherein the instructions, when executed by the at least one computing device, prompt the at least one computing device to execute the power supply control method for the assembly under test as described above.

[0018] According to another aspect of the present disclosure, a computer-readable storage medium storing instructions is provided, wherein when the instructions are executed by at least one computing device, the at least one computing device is prompted to execute the power supply control method for the assembly under test as described above.

[0019] By adopting the present disclosure, the automation of power-on and power-off operations can be achieved, thereby ensuring the safety of the system and personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or other objects and advantages of the present disclosure will become more apparent through the following description of embodiments in conjunction with the accompanying drawings, in which: Figure 1 is a flow chart showing a power supply control method for an assembly under test according to an exemplary embodiment of the present disclosure; Figure 2 is a schematic diagram showing a test platform for a wind turbine generator system according to an exemplary embodiment of the present disclosure; Figure 3 is a flow chart showing a method for controlling power transmission of a cabin according to an exemplary embodiment of the present disclosure; Figure 4 is a flow chart showing a cabin power-off control method according to an exemplary embodiment of the present disclosure; Figure 5 is a schematic diagram showing the internal components of a pitch system; Figure 6 is a flow chart showing an impeller power transmission control method according to an exemplary embodiment of the present disclosure; Figure 7 is a flow chart showing an impeller power-off control method according to an exemplary embodiment of the present disclosure; Figure 8 is a flow chart showing a contact sticking detection method according to an exemplary embodiment of the present disclosure; Fig. 9 is a schematic diagram showing a control circuit of a power transmission contactor coil according to an exemplary embodiment of the present disclosure; Fig.10 is a block diagram showing a power supply control device for an assembly under test according to an exemplary embodiment of the present disclosure; Fig.11 is a block diagram illustrating a computing system including at least one computing device and at least one storage device storing instructions according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0021] Below, in conjunction with the accompanying drawings, a description of a specific embodiment is provided to help the reader obtain a comprehensive understanding of the method, device and / or system described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the method, device and / or system described herein will be clear. For example, the order of operations described herein is only an example and is not limited to those orders set forth herein, but can be changed as will be clear after understanding the disclosure of the present application, except for operations that must occur in a specific order. In addition, for greater clarity and simplicity, the description of features known in the art may be omitted.

[0022] In electrical operations, it is necessary to follow the specified power-on and power-off sequences, otherwise unexpected risks may occur. For example, when powering off a device, in order to better protect the device and prevent the generation of self-inductance potential and arcs, the low-voltage side switch should be disconnected first. This is because if the high-voltage side switch is directly disconnected, an arc is likely to be generated, causing damage to the equipment. If the low-voltage side switch is disconnected first, the current generated is small and it is not easy to generate an arc. For another example, when powering on a device, in order to prevent the current from being too large at the moment of power transmission, posing a threat and danger to the personal safety of personnel, it is required to disconnect all switches and transmit power step by step. If all sub-switches are turned on, excessive current will be generated at the moment of power transmission, resulting in electric sparks, and even causing harm or damage to the power transmission personnel. Generally, methods used to avoid the risk of electric shock include: setting safety requirements for electricity use. This method can theoretically ensure the compliance of electricity use, but in actual operation, due to personnel experience, forgetfulness, fluke mentality or rush to complete the work, live operation or wrong power supply and power off sequence may cause electric shock accidents; setting lock plate logo. Although the variable pitch capacitor switch can be powered on by setting a lock plate logo on site, in the final assembly plant, especially for the cabin, since all electrical components need to be tested, this method has great limitations. In addition, for the problem of contact adhesion, when the relay or contactor has contact adhesion, it is not easy to find the problem by naked eye observation.

[0023] Figure 1 is a flow chart illustrating a power supply control method for an assembly under test according to an exemplary embodiment of the present disclosure.

[0024] like Figure 1 As shown, in step S101, the level state of the feedback contact of the electrical switch in the assembly under test is obtained. In an example, the assembly under test includes a nacelle and / or a rotor of a wind turbine generator set.

[0025] In step S102, based on the level state of the feedback contact of the electrical switch in the assembly under test, the power supply contactor connected between the power supply for powering the assembly under test and the assembly under test is opened or closed to power off or power on the assembly under test.

[0026] In the example, for the case where the assembly under test is the cabin of a wind turbine generator set, in response to the power supply request of the assembly under test and the level state of the feedback contacts of all electrical switches in the assembly under test is low, the power supply contactor is turned on to supply power to the assembly under test; in response to the power-off request of the assembly under test, the level state of the feedback contacts of all electrical switches in the assembly under test is low and the switch control signals sent to all electrical switches are low, the power supply contactor is turned off to power off the assembly under test. For example, a DC contactor (or power supply contactor) is added to the test platform loop, and the coil of the DC contactor is controlled by the output point of the controller of the test platform. The power supply of the unit under test is provided by the test platform. Before supplying power to the unit, the test platform first provides a 24V power supply to the PLC module and loop of the cabin to establish communication between the test platform and the cabin, and detects the closed state of each switch through communication. The controller of the test platform detects each DO state, and only allows the closed contactor to power on when all DO states are low, so as to ensure that the actuator will not suddenly move or rotate when powered on. In the example, when the power is cut off for the assembly under test, two levels of power-off control are set up (the relay is controlled by the controller of the test platform and the emergency stop switch is controlled). When the relay is controlled by the controller of the test platform, when power needs to be cut off, the controller detects whether all the lower-level switches have been disconnected to ensure safety during the power-off process. The emergency stop switch is used for unconditional power off in an emergency, which ensures both the safety of the system circuit and safety in an emergency.

[0027] In another example, for the case where the assembly under test is the impeller of a wind turbine generator set, in response to the power supply request of the assembly under test and the level state of the feedback contact of the pitch capacitor switch in the assembly under test are both low, the power supply contactor is turned on to power the assembly under test; in response to the power-off request of the assembly under test, the level state of the feedback contact of the pitch capacitor switch in the assembly under test are both low and the pitch speed is zero, the power supply contactor is disconnected to power off the assembly under test. For example, before supplying power to the assembly under test, the test platform first provides a 24V power supply to the PLC module and loop of the impeller to establish DP communication between the test platform and the impeller, and detects the closed state of the supercapacitor switch through communication. Power-on is allowed only when the supercapacitor switch state is disconnected to ensure that the driver / inverter unit will not be burned out at the moment of power-on. Before powering off the assembly under test, the controller of the test platform detects whether the supercapacitor switch of the impeller is disconnected. If it is disconnected, the impeller system is allowed to be powered off to ensure the safety of the driver / inverter unit.

[0028] In addition, in response to the switch control signals sent to all electrical switches in the tested assembly being at a low level and the level state of the feedback contact of at least one electrical switch in the tested assembly being at a high level, the power supply contactor can be disconnected to cut off the power supply to the tested assembly, and an alarm message for the at least one electrical switch can be issued. For example, when all DO output points are at a low level, the feedback contacts of each relay / contactor are monitored in real time to see if they are all at a low level. If any contact of the contactor is at a high level, the controller of the test platform issues an alarm signal and controls the power supply contactor to cut off the power supply. The reason is that if the DO output of the control relay / contactor coil is low level, but the contact of the relay / contactor is high level, there is a high probability that the contact has been stuck, which is prone to a greater risk of electric shock and safety hazards. After the contact is stuck, the relay / contactor is directly in the on state, and there is a risk of the actuator acting on its own or there is a risk of electric shock when the cable is removed (for example, when it is necessary to remove cables or equipment that is not needed, if the contacts are stuck, the cables on the power side are still in a live state, and leakage, electric shock, or the removed equipment continues to operate). By adopting the solution disclosed in the present invention, contact adhesion can be detected in time to ensure the safety of the operator.

[0029] By using the power supply control method for the assembly under test according to the exemplary embodiment of the present disclosure, the automation of power-on and power-off operations can be achieved, the safety of the system and personnel can be ensured, and problems such as negligence, omissions, or erroneous steps during operation can be avoided. The compliance and safety of the test process can be ensured, and the power can be cut off in time in an emergency to ensure the safety of the unit test.

[0030] Figure 2 is a schematic diagram showing a test platform for a wind turbine generator system according to an exemplary embodiment of the present disclosure.

[0031] like Figure 2 As shown, a test platform for a wind turbine generator set according to an exemplary embodiment of the present disclosure includes: a power supply contactor connected between a power supply for supplying power to the assembly under test and the assembly under test; and a controller configured to execute the power supply control method for the assembly under test as described above. Figure 2The test platform shown is an automated platform for testing wind turbines, which is internally provided with a controller and a power supply contactor, and may also include an emergency stop switch / button for unconditional power outages in emergency situations. The power supply contactor is used to control the 400V power supply to the assembly under test, providing a 400V power supply to the impeller or nacelle. In addition, a communication line and a 24V power supply line may be provided between the test platform and the assembly under test. The communication line is used to collect data from the impeller or nacelle, and the 24V power supply line is used to provide 24V power to the PLC module and 24V circuit in the impeller or nacelle. Its main function is to automatically detect whether the switch at the next level is in the disconnected state before the unit is powered on. Figure 2 In the figure, the left part is the power supply / transmission circuit of the test platform, and the right part is the control circuit of the nacelle / impeller of the wind turbine generator set. When testing the unit, the test platform provides a 400V power supply to the assembly under test and a temporary 24V power supply to the assembly under test (for power-on safety detection). The controller in the test platform communicates with the PLC module in the assembly under test through the communication line to read the DI switch signal in the nacelle (including circuit breaker feedback signal, contactor feedback signal, etc.). The controller of the test platform detects the signal in the assembly under test through communication, and judges the state of the device switch in the nacelle, such as disconnection and connection, and contact adhesion, based on the DI switch input signal in the assembly under test, so as to avoid spark discharge when powering on and avoid problems such as contact welding. The DO digital output signal of the nacelle or impeller comes from the controller of the test platform, and the DI digital output signal of the nacelle or impeller comes from the feedback signal of the electrical switch in the nacelle, and is collected by the digital input module of the nacelle and transmitted to the controller of the test platform. The test platform controls the power supply of the assembly under test through the power supply contactor. The 24V voltage is connected to the positive end of the power supply contactor coil through the normally closed point of the emergency stop switch and the normally open contact of the control relay. The negative end of the coil of the power supply contactor is connected to 0V. The control contactor is controlled by the controller of the test platform (for example, PLC); one end of the main contact of the power supply contactor is connected to 400V AC, and the other end is connected to the assembly under test through, for example, a Harding plug. When power supply or power outage is required, the controller of the test platform pre-detects the state of the DI switch quantity of the cabin or impeller to determine whether power supply or power outage is allowed, thereby ensuring the safety of unit power-on and unit testing.

[0032] The test platform for wind turbines according to the exemplary embodiment of the present disclosure is suitable for testing various wind turbines, and has a simple hardware structure and low cost. It can issue corresponding alarm information according to the detected status, so that testers can understand the power supply status of the unit in time, reduce troubleshooting time, and provide timeliness for testing and debugging of the test platform and the unit.

[0033] Figure 3is a flowchart illustrating a cabin power transmission control method according to an exemplary embodiment of the present disclosure.

[0034] like Figure 3 As shown, in step S301, the controller in the test platform starts running. In step S302, the test platform outputs 24V to power the cabin system. In step S303, it is determined whether the communication between the test platform and the cabin system has been established (for example, optical fiber communication). If it is determined in step S303 that the communication between the test platform and the cabin system has not been established, then in step S304, an abnormal warning is output to prompt the tester to check the communication line between the test platform and the cabin system (for example, if the communication is abnormal, the host computer of the test platform will pop up a prompt message to prompt the tester to check the communication line). If it is determined in step S303 that the communication between the test platform and the cabin system has been established, then in step S305, the controller of the test platform (for example, PLC) reads the switch quantity state of the cabin. Next, in step S306, it is determined whether the relevant signal (for example, the feedback contact of the electrical components such as the air switch, circuit breaker, contactor, etc. in the cabin read by the controller of the test platform through the communication line) is a low-level signal. If it is determined in step S306 that there is a high-level signal in the relevant signal, then in step S307, a switch closing signal is output to prompt the relevant personnel to disconnect the switch corresponding to the high-level signal (for example, if a switch is detected to be in a closed state, the upper computer of the test platform will pop up a prompt message to prompt the tester to disconnect the lower switch to ensure safety during the power-on process). If it is determined in step S306 that the relevant signals are all low-level signals, then in step S308, the controller of the test platform can control the power supply contactor to be turned on to supply power to the assembly under test. Next, in step S309, after the unit is successfully powered on, the 24V power supply relay is disconnected to stop the test platform from supplying 24V power to the cabin system.

[0035] By using the cabin power supply control method according to the exemplary embodiment of the present disclosure, it is possible to avoid excessive current at the moment of power supply that causes electric sparks, and avoid the generation of self-inductance potential and arcs, thereby protecting the safety of devices and personnel.

[0036] Figure 4 is a flowchart illustrating a nacelle power off control method according to an exemplary embodiment of the present disclosure.

[0037] like Figure 4As shown, in step S401, determine whether the emergency stop button is pressed. If it is determined in step S401 that the emergency stop button is pressed, proceed to step S407 to control the disconnection of the power supply contactor through the controller of the test platform to stop supplying AC power (for example, 400V AC power) to the assembly under test. If it is determined in step S401 that the emergency stop button is not pressed, when the software button of "disconnecting power supply" is triggered in step S402, it is determined in step S403 whether the relevant signal (for example, the feedback contact of the electrical components such as the air switch, circuit breaker, contactor, etc. in the cabin read by the controller of the test platform through the communication line) is a low-level signal. If it is determined in step S403 that there is a high-level signal in the relevant signal, the relevant personnel are prompted to disconnect the switch corresponding to the high-level signal in step S404. If it is determined in step S403 that the relevant signals are all low-level signals, it is determined in step S405 whether the DO switch quantity of the controller of the test platform is all low-level. If it is determined in step S405 that there is a high level in the DO switch quantity of the controller of the test platform, then in step S406, it is prompted that the operation of the actuator needs to be stopped or the operation of the actuator needs to be automatically stopped and an alarm message is issued, and then the power supply contactor is disconnected in step S407. If it is determined in step S405 that the DO switch quantities of the controller of the test platform are all low levels, then in step S407, the power supply contactor is disconnected through the control of the controller of the test platform to stop supplying AC power (for example, 400V AC power) to the assembly under test.

[0038] By means of the cabin power-off control method according to the exemplary embodiment of the present disclosure, safety during the power-off process can be ensured.

[0039] Figure 5 Schematic diagram showing the internal composition of the pitch system.

[0040] A backup power source (e.g., supercapacitor) is often included in the pitch system, e.g. Figure 5 As shown, the supercapacitor is connected in parallel at both ends of the inverter unit power supply. At the moment the power is turned on, the voltage at both ends of the supercapacitor will not change suddenly, but the current at both ends of the supercapacitor will change suddenly, and the two ends of the supercapacitor are equivalent to a short circuit, which can easily damage the rectifier / inverter unit. Since general inverters (inverters are integral structures) are usually used in large megawatt units, the entire inverter needs to be replaced after the rectifier / inverter unit is damaged, resulting in hardware cost losses and seriously affecting the progress of factory delivery.

[0041] Figure 6 is a flowchart illustrating an impeller power transmission control method according to an exemplary embodiment of the present disclosure.

[0042] like Figure 6As shown, in step S601, the controller in the test platform starts running. In step S602, the test platform outputs 24V to power the impeller system. In step S603, it is determined whether the communication between the test platform and the impeller system has been established (for example, DP communication). If it is determined in step S603 that the communication between the test platform and the impeller system has not been established, then in step S604, an abnormal warning is output to prompt the tester to check the communication line between the test platform and the impeller system (for example, if the communication is abnormal, the host computer of the test platform will pop up a prompt message to prompt the tester to check the communication line). If it is determined in step S603 that the communication between the test platform and the impeller system has been established, then in step S605, the controller of the test platform (for example, PLC) reads the switch state of the pitch capacitor switch. Next, in step S606, it is determined whether the relevant signal (for example, the feedback contact of the power supply switch of the pitch capacitor cabinet in the impeller read by the controller of the test platform through communication) is a low-level signal. If it is determined in step S606 that there is a high-level signal in the relevant signal, then in step S607, a switch closing signal is output to prompt the relevant personnel to disconnect the switch corresponding to the high-level signal (for example, if a switch is detected to be in a closed state, the upper computer of the test platform will pop up a prompt message to prompt the tester to disconnect the lower switch to ensure safety during the power-on process). If it is determined in step S606 that the relevant signals are all low-level signals, then in step S608, the controller of the test platform can control the power supply contactor to be turned on to supply power to the assembly under test. Next, in step S609, after the unit is successfully powered on, the 24V power supply relay is disconnected to stop the test platform from supplying 24V power to the cabin system.

[0043] In the impeller power supply control method according to the exemplary embodiment of the present disclosure, before the unit is powered on, the test platform first provides a 24V power supply to the PLC module and loop of the impeller to establish DP communication between the test platform and the impeller, and detects the closed state of the supercapacitor switch through DP communication. Power-on is allowed only when the supercapacitor switch is in the open state to prevent the driver / inverter unit from being burned out at the moment of power-on.

[0044] Figure 7 is a flow chart illustrating an impeller power-off control method according to an exemplary embodiment of the present disclosure.

[0045] like Figure 7As shown, in step S701, it is determined whether the emergency stop button is pressed. If it is determined in step S701 that the emergency stop button is pressed, the power supply contactor is disconnected by the controller of the test platform to stop supplying AC power (for example, 400V AC power) to the assembly under test. If it is determined in step S701 that the emergency stop button is not pressed, when the software button of "disconnecting power supply" is triggered in step S702, it is determined in step S703 whether the capacitor switch signal is a low-level signal and whether the pitch speed is zero. If it is determined in step S703 that the capacitor switch signal is a high-level signal or the pitch speed is not zero, the relevant personnel are prompted to disconnect the capacitor switch in step S704. If it is determined in step S703 that the capacitor switch signal is a low-level signal and the pitch speed is zero, the power supply contactor is disconnected by the controller of the test platform in step S705 to stop supplying AC power (for example, 400V AC power) to the assembly under test.

[0046] In the impeller power-off control method according to an exemplary embodiment of the present disclosure, before the unit is powered off, the controller of the test platform detects whether the supercapacitor switch of the impeller is disconnected. Only when the supercapacitor switch is disconnected is the impeller system allowed to be powered off to ensure the safety of the drive / inverter unit.

[0047] Figure 8 is a flow chart illustrating a contact sticking detection method according to an exemplary embodiment of the present disclosure.

[0048] like Figure 8 As shown, in step S801, the controller in the test platform starts running. In step S802, the test platform sets all the controlled DO signals to low-level signals. In step S803, it is determined whether all the detected DI signals are low-level signals. If it is determined in step S803 that any one of the DI signals is a high-level signal, it is determined that there is a contact adhesion condition and a contact adhesion alarm message is issued in step S804. Next, in step S805, the controller of the test platform controls the disconnection of the power supply contactor to stop supplying AC power (for example, 400V AC power) to the assembly under test. If the DO output of the control relay / contactor coil is low level, but the contact of the relay / contactor is high level, it is highly likely that the contact has been adhered, and there is a greater risk of electric shock and safety hazards at this time, that is, after the contact is adhered, the relay / contactor is directly in the on state, and there is a risk of the actuator acting on its own or the risk of electric shock when the cable is removed.

[0049] The contact adhesion detection method according to the exemplary embodiment of the present disclosure is mainly applicable to the cabin (including the generator and the gearbox and its accessories (for example, the gearbox oil pump, the cooling fan, etc.)). The controller of the test platform compares the DO signal with the DI signal in real time. If an abnormality is detected, an alarm message is issued and the power supply contactor is automatically disconnected to ensure the safety of the system and personnel. It can also realize the automatic detection of complex signals of the unit and fully ensure the safety of the test system. For example, in the case of manual detection, it is usually only after it is found that the actuator is still in action or leakage is found that the cause of contact adhesion is detected. The contact adhesion detection method according to the exemplary embodiment of the present disclosure can detect the abnormality in the first time and automatically perform safety protection.

[0050] An example of the contact sticking detection result is shown in Table 1 below. In Example 2, the DO signal of mechanism 3 is at a low level, and the fed-back DI signal is at a high level. At this time, it can be judged that the contact is stuck. The controller of the test platform according to the embodiment of the present disclosure can automatically control the disconnection of the power supply contactor to ensure the safety of personnel, and prompt to check the corresponding switch device.

[0051] Table 1

[0052] Fig. 9 is a schematic diagram showing a control circuit of a power transmission contactor coil according to an exemplary embodiment of the present disclosure. Fig. 9 The control contacts shown are controlled by the controller of the test platform, and the emergency stop button can be a hardware control switch for power-off operation in an emergency, which not only ensures the safety of the system circuit, but also ensures safety in an emergency. Fig. 9 In the test platform, the 400V outlet is connected to the assembly under test. A DC contactor (or power supply contactor) is added to the test platform loop, and the coil of the DC contactor is controlled by the output point of the test platform controller.

[0053] Fig.10 is a block diagram illustrating a power supply control device for an assembly under test according to an exemplary embodiment of the present disclosure.

[0054] like Fig.10 As shown, the power supply control device 1000 for the assembly under test includes: a communication unit 1001, which is communicatively connected to the assembly under test and is used to obtain the level state of the feedback contacts of the electrical switch in the assembly under test; a power supply control unit 1002, which is used to disconnect or connect the power supply contactor connected between the power supply for powering the assembly under test and the assembly under test based on the level state of the feedback contacts of the electrical switch in the assembly under test, so as to power off or power on the assembly under test.

[0055] In an example, the assembly under test includes a cabin of a wind turbine generator set, and the power supply control unit 1002 is configured to: in response to a power supply request of the assembly under test and the level states of the feedback contacts of all electrical switches in the assembly under test are low, turn on the power supply contactor to supply power to the assembly under test. In an example, the power supply control unit 1002 is configured to: in response to a power-off request of the assembly under test, the level states of the feedback contacts of all electrical switches in the assembly under test are low, and the switch control signals sent to all electrical switches are low, turn off the power supply contactor to power off the assembly under test.

[0056] In an example, the assembly under test includes an impeller of a wind turbine generator set, and the power supply control unit 1002 is configured to: in response to a power supply request of the assembly under test and the level state of the feedback contact of the pitch capacitor switch in the assembly under test are both low, turn on the power supply contactor to power on the assembly under test. In an example, the power supply control unit 1002 is configured to: in response to a power-off request of the assembly under test, the level state of the feedback contact of the pitch capacitor switch in the assembly under test are both low and the pitch speed is zero, turn off the power supply contactor to power off the assembly under test.

[0057] In the example, the power supply control unit 1002 is configured to: in response to the switch control signals sent to all electrical switches in the assembly under test being low level and the level state of the feedback contact of at least one electrical switch in the assembly under test being high level, disconnect the power supply contactor to cut off power to the assembly under test, and issue an alarm message for the at least one electrical switch.

[0058] Combination of the above Figures 1 to 9 The specific operations shown are respectively Fig.10 The power supply control device for the assembly under test 1000 shown in the figure is executed by the corresponding units, and the specific operation details will not be repeated here. By adopting the power supply control device for the assembly under test according to the exemplary embodiment of the present disclosure, it is possible to ensure the compliance of power use and to ensure timely power off in an emergency, thereby ensuring the safety of the unit test from two aspects.

[0059] Fig.11 is a block diagram illustrating a computing system including at least one computing device and at least one storage device storing instructions according to an exemplary embodiment of the present disclosure.

[0060] like Fig.11 As shown, a computing system 1100 provided according to an exemplary embodiment of the present invention includes a computing device 1101 and a storage device 1102, wherein the storage device 1102 stores computer executable instructions. When the computer executable instructions are executed by the computing device 1101, the power supply control method for the assembly under test described in any of the aforementioned embodiments is executed.

[0061] The computing device 1101 is deployed in a server or client, and can also be deployed on a node device in a distributed network environment. In addition, the computing device 1101 can be a PC computer, a tablet device, a personal digital assistant, a smart phone, a web application or other device capable of executing the above-mentioned instruction set. Here, the computing device is not necessarily a single computing device, but can also be any device or circuit that can execute the above-mentioned instructions (or instruction sets) individually or jointly. The computing device can also be part of an integrated control system or a system manager, or can be configured as a portable electronic device that is interconnected with an interface locally or remotely (for example, via wireless transmission). In the computing device, the processor includes a central processing unit (CPU), a graphics processing unit (GPU), a programmable logic device, a dedicated processor system, a microcontroller or a microprocessor. As an example and not a limitation, the processor also includes an analog processor, a digital processor, a microprocessor, a multi-core processor, a processor array, a network processor, etc.

[0062] According to another aspect of the present disclosure, a computer-readable storage medium storing instructions is provided, and when the instructions are executed by at least one computing device, the at least one computing device is prompted to execute the power supply control method for the assembly under test described in any of the aforementioned embodiments. Computer-readable storage media include magnetic media such as floppy disks and tapes, optical media (including compact disk (CD) ROM and DVD ROM), magneto-optical media such as floppy disks, hardware devices such as ROM, RAM, and flash memory designed to store and execute program commands. The instructions may include language codes executable by a computer using an interpreter and machine language codes generated by a compiler.

[0063] By adopting the present disclosure, the automation of power-on and power-off operations can be achieved, thereby ensuring the safety of the system and personnel.

[0064] The processes, methods or algorithms disclosed herein may be transmitted to or implemented by a processing device, a controller or a computer, which may include any existing programmable electronic control unit or a dedicated electronic control unit. Similarly, the processes, methods or algorithms may be stored in a variety of forms as data and instructions that can be executed by a controller or a computer, including but not limited to information being permanently stored on a non-writable storage medium (such as a ROM device) and information being variably stored on a writable storage medium (such as a floppy disk, a tape, a CD, a RAM device, and other magnetic and optical media). The processes, methods or algorithms may also be implemented in a software executable object. Optionally, the processes, methods or algorithms may be implemented in whole or in part using suitable hardware components (such as an ASIC, an FPGA, a state machine, a controller or other hardware components or devices) or a combination of hardware components, software components and firmware components.

[0065] Although the present disclosure includes specific examples, it will be apparent to those of ordinary skill in the art that various changes in form and detail may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein will be considered to be descriptive only and not for limiting purposes. The description of the features or aspects in each example will be considered to be applicable to similar features or aspects in other examples. Suitable results may be obtained if the described techniques are performed in a different order, and / or if the components in the described systems, architectures, devices, or circuits are combined in different ways and / or replaced or supplemented with other components or their equivalents in the described systems, architectures, devices, or circuits. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents will be interpreted as included in the present disclosure.

Claims

1. A power supply control method for a tested assembly, characterized in that: The power supply control method for the assembly under test includes: Obtaining the level state of the feedback contact of the electrical switch in the assembly under test; Based on the level state of the feedback contact of the electrical switch in the assembly under test, the power supply contactor connected between the power supply for supplying power to the assembly under test and the assembly under test is opened or closed to cut off or supply power to the assembly under test.

2. The power supply control method for the assembly under test according to claim 1, characterized in that: The assembly under test includes a nacelle of a wind turbine generator set, The steps of disconnecting or connecting a power supply contactor connected between a power supply for supplying power to the assembly under test and the assembly under test based on the level state of the feedback contact of the electrical switch in the assembly under test to disconnect or supply power to the assembly under test include: In response to the power supply request of the assembly under test and the level states of the feedback contacts of all electrical switches in the assembly under test being low, the power supply contactor is turned on to supply power to the assembly under test.

3. The power supply control method for the assembly under test according to claim 2, characterized in that: The step of disconnecting or connecting a power supply contactor connected between a power supply for supplying power to the assembly under test and the assembly under test based on the level state of the feedback contact of the electrical switch in the assembly under test to disconnect or supply power to the assembly under test also includes: In response to the power-off request of the assembly under test, the level states of the feedback contacts of all electrical switches in the assembly under test are all low level and the switch control signals sent to all electrical switches are all low level, and the power supply contactor is disconnected to power off the assembly under test.

4. The power supply control method for the assembly under test according to claim 1, characterized in that: The assembly under test includes an impeller of a wind turbine generator set, The steps of disconnecting or connecting a power supply contactor connected between a power supply for supplying power to the assembly under test and the assembly under test based on the level state of the feedback contact of the electrical switch in the assembly under test to disconnect or supply power to the assembly under test include: In response to the power supply request of the assembly under test and the level state of the feedback contact of the pitch capacitor switch in the assembly under test being low, the power supply contactor is turned on to supply power to the assembly under test.

5. The power supply control method for the assembly under test according to claim 4, characterized in that: The step of disconnecting or connecting a power supply contactor connected between a power supply for supplying power to the assembly under test and the assembly under test based on the level state of the feedback contact of the electrical switch in the assembly under test to disconnect or supply power to the assembly under test also includes: In response to the power-off request of the measured assembly, the level states of the feedback contacts of the pitch capacitor switch in the measured assembly are all low level and the pitch speed is zero, and the power supply contactor is disconnected to power off the measured assembly.

6. The power supply control method for the assembly under test according to claim 1, characterized in that: The steps of disconnecting or connecting a power supply contactor connected between a power supply for supplying power to the assembly under test and the assembly under test based on the level state of the feedback contact of the electrical switch in the assembly under test to disconnect or supply power to the assembly under test include: In response to the switch control signals sent to all electrical switches in the assembly under test being at a low level and the level state of the feedback contact of at least one electrical switch in the assembly under test being at a high level, the power supply contactor is disconnected to cut off power to the assembly under test, and an alarm message is issued for the at least one electrical switch.

7. A power supply control device for a tested assembly, characterized in that: The power supply control device for the assembly under test comprises: A communication unit, connected to the assembly under test for obtaining a level state of a feedback contact of an electrical switch in the assembly under test; A power supply control unit is used to disconnect or connect a power supply contactor connected between a power supply for supplying power to the assembly under test and the assembly under test based on the level state of the feedback contact of the electrical switch in the assembly under test, so as to cut off or supply power to the assembly under test.

8. A test platform for a wind turbine generator set, characterized in that: The test platform comprises: A power supply contactor connected between a power source for supplying power to the assembly under test and the assembly under test; A controller is configured to execute the power supply control method for the assembly under test according to any one of claims 1 to 6.

9. A computing system comprising at least one computing device and at least one storage device storing instructions, characterized in that: When the instructions are executed by the at least one computing device, the at least one computing device is prompted to execute the power supply control method for the assembly under test according to any one of claims 1 to 6.

10. A computer-readable storage medium storing instructions, characterized in that: When the instructions are executed by at least one computing device, the at least one computing device is prompted to execute the power supply control method for the assembly under test according to any one of claims 1 to 6.

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