Multi-point synchronous power distribution method and device based on common circuit

Abstract

The invention provides a multi-point synchronous power distribution method and device based on a common circuit, and belongs to the technical field of crown block power supply.According to the multi-point synchronous power distribution method based on the common circuit, a plurality of electric cabinets are connected into the same power frequency power grid, electric power parameters are obtained in real time, phase compensation is carried out, and the power distribution efficiency is improved; then the frequency of the electric power signal is increased through frequency multiplication processing, so that the frequency of the electric power signal meets the power supply requirement of the track network, the output of each electric cabinet and the electric power signal are subjected to phase locking synchronization, the electric power phase is consistent, and additional central synchronization equipment is not needed to communicate with each electric cabinet; a large amount of communication equipment and wiring arrangement are saved, the synchronism and stability of power supply are directly and automatically realized in each electric cabinet, the power quality is optimized, a crown block track network can be ensured to obtain stable and accurate power support, and the power taking stability of a crown block is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of overhead crane power supply, and in particular to a multi-point synchronous power distribution method and device based on a common circuit. Background Art

[0002] In factories or workshops, since the public grid power directly output from the substation cannot directly meet the needs of special equipment in the entire factory, multiple distribution cabinets need to be set up inside the factory or workshop to process the public grid power (frequency conversion, voltage conversion or other processing) before transmitting it to the corresponding application equipment or devices for use. Since the power supply of the overhead crane is wireless, the power pick-up on the overhead crane cooperates with the excitation line on the track to cut and form an induced current to realize wireless power supply for the overhead crane. Therefore, the distribution cabinet mainly supplies power to the excitation line on the track. The excitation line is high-frequency electricity and cannot be automatically synchronized. In addition, the power supply range of the distribution cabinet is limited, so regional power supply is required on the overhead crane track, that is, multiple power supply cabinets are set up to power the entire overhead crane track.

[0003] When multiple distribution cabinets are processing and converting the industrial frequency power grid, the phase of the output power frequency synchronization clock between the distribution cabinets may be inconsistent due to the influence of the inductive and capacitive modules in each distribution cabinet, causing abnormal deviation in the phase of the partial discharge signal. When the power-consuming equipment is transported from one distribution cabinet area to another distribution cabinet power supply circuit, due to the phase difference of the power supply between the two cabinets, the cross-regional power-consuming equipment will have power supply anomalies at the intersection of the power supply networks of the two cabinets. If multiple distribution cabinets supply power to the overhead crane, a power supply intersection will be generated on the overhead crane track, that is, from the power supply area of ​​cabinet A to the power supply area of ​​cabinet B. When the overhead crane draws power across regions, if the output power between the A and B distribution cabinets is inconsistent, it will cause abnormal power supply to the overhead crane in the intersection area.

[0004] Therefore, in actual application scenarios, the existing technology requires that when configuring the distribution cabinet network, a central synchronization device be equipped in the power layout network, connected to each other in a star or ring connection, and a communication control network be established between the central synchronization device and each distribution cabinet, so that the output phase of each cabinet is synchronized. Among them, when the control signal of the central synchronization device is transmitted, it is necessary to use cables, optical fibers or other communication media to communicate with each cabinet.

[0005] Although the existing technology can solve the above synchronization problem, it requires additional central synchronization equipment and a large amount of wiring design. For the overhead crane power supply network, the phase synchronization of the overhead crane when drawing power in different areas does not require the phase synchronization of the mains power, but is more concerned with whether the output phases of each power cabinet are consistent at the same time. Therefore, how to ensure the synchronization of the output phases of multiple distribution cabinets in the same mains power environment at the same time without adding additional power distribution facilities and wiring is an urgent problem to be solved. Summary of the invention

[0006] The present invention provides a multi-point synchronous power distribution method and device based on a common circuit, which are used to solve the defect that phase synchronization in the prior art requires a large amount of wiring, and realize phase synchronization without setting up additional equipment and wiring.

[0007] The present invention provides a multi-point synchronous power distribution method based on a common circuit, comprising: Make sure that all power cabinets supplying power to the same rail network are connected to the same power frequency power grid; Obtaining power parameters of the power grid through each power cabinet; the power parameters include power grid voltage, phase and frequency; The phase of the industrial frequency power grid is determined as a reference phase, and the phase of the power input into the electric cabinet is detected and compensated, so as to synchronize the phase of the power output of each electric cabinet as the reference phase; Performing frequency doubling processing on the compensated output power in the electric cabinet so that the frequency of the output power of the electric cabinet is increased to a target frequency; the target frequency is the frequency of the output power of the electric cabinet; The output electricity of the electric cabinet after frequency doubling is connected to the track network to supply power to the track network.

[0008] According to a multi-point synchronous power distribution method based on a common circuit provided by the present invention, before the output power of the power cabinet after frequency doubling is connected to the rail network to supply power to the rail network, the method further includes: Based on the reference phase, the output power of the switch cabinet after frequency doubling is phase-detected and compensated, so that the output power phase of each switch cabinet remains consistent after frequency doubling.

[0009] According to a multi-point synchronous power distribution method based on a common circuit provided by the present invention, phase detection and compensation of electricity are realized by a phase-locked loop circuit, and the phase-locked loop circuit includes a phase detector, a voltage-controlled oscillator and a feedback circuit connected to each other; The phase detector is used to compare the phase difference between the reference phase and the signal output by the voltage-controlled oscillator, and generate a reference phase control signal; The voltage controlled oscillator is used to adjust the output signal according to the reference phase control signal so that the phase of the output electricity is the same as the reference phase; The feedback circuit is used to feed back the signal output by the voltage-controlled oscillator to the phase detector to form a closed-loop control.

[0010] According to a multi-point synchronous power distribution method based on a common circuit provided by the present invention, the phase detector also includes a low-pass filter, which is used to filter the high-frequency noise in the output signal of the phase detector and retain the DC component representing the phase difference to generate the reference phase control signal to adjust the operating parameters of the voltage-controlled oscillator.

[0011] According to a multi-point synchronous power distribution method based on a common circuit provided by the present invention, after the output power of the power cabinet after frequency doubling is connected to the rail network to supply power to the rail network, the method further includes: detecting power parameters in the rail network; In the case where the power parameters of the rail network deviate, the power parameters of the output power of the power cabinets are adjusted based on the reference phase so that the phases of the output power of each power cabinet are synchronized.

[0012] According to a multi-point synchronous power distribution method based on a common circuit provided by the present invention, the output power of the power cabinet after frequency doubling is connected to the rail network to supply power to the rail network, comprising: Connecting the output power of each electric cabinet after frequency doubling processing to the Litz wire of the corresponding track area in the track network; When the overhead crane travels from the first track area to the second track area, based on the track segment types of the first track area and the second track area, the driving parts of the overhead crane are controlled to adjust the power supply of the overhead crane to switch from the Litz wire of the first track area to the Litz wire of the second track area; the phase of the electricity on the Litz wire of the first track area and the second track area is the same.

[0013] The present invention also provides a multi-point synchronous power distribution device based on a common circuit, comprising: The access module is used to determine that each electric cabinet supplying power to the same rail network is connected to the same power frequency power grid; An acquisition module is used to acquire power parameters of the power grid through each power cabinet; the power parameters include voltage, phase and frequency of the power grid; A first processing module is used to determine the phase of the power frequency power grid as a reference phase, and perform phase detection and compensation on the power input into the electric cabinet to synchronize the phase of the power output of each electric cabinet as the reference phase; The second processing module is used to perform frequency doubling processing on the output power after compensation in the electric cabinet, so that the frequency of the output power of the electric cabinet is increased to a target frequency; the target frequency is the frequency of the output power of the electric cabinet; The third processing module is used to connect the output electricity of the electric cabinet after frequency doubling processing to the track network to supply power to the track network.

[0014] The present invention also provides an electric cabinet, comprising a cabinet body and a power distribution system arranged in the cabinet body, wherein the power distribution system comprises an input module and an output module, wherein the input module is used to access an industrial frequency power grid, and the output module is used to access a track network of an overhead traveling vehicle; The power distribution system adopts any of the above-mentioned multi-point synchronous power distribution methods based on a common circuit to distribute power to the track network of the overhead travelling vehicle.

[0015] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements any of the multi-point synchronous power distribution methods based on a common circuit as described above.

[0016] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the multi-point synchronous power distribution method based on a common circuit as described in any one of the above is implemented.

[0017] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the computer program implements any of the above-mentioned multi-point synchronous power distribution methods based on a common circuit.

[0018] The multi-point synchronous power distribution method and device based on a common circuit provided by the present invention connect multiple power cabinets to the same industrial frequency power grid, obtain power parameters in real time and perform phase compensation, and then increase the frequency of the power signal through frequency multiplication processing, so that the frequency of the power signal meets the power supply demand of the rail network, and the output of each power cabinet is phase-locked and synchronized with the power signal to achieve power phase consistency. There is no need to add additional central synchronization equipment to communicate with each power cabinet, which saves a lot of communication equipment and wiring settings, and automatically realizes the synchronization and stability of power supply directly in each power cabinet, optimizes the quality of electricity, ensures that the overhead crane rail network can obtain stable and accurate power support, and ensures the stability of the overhead crane power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a flow chart of a multi-point synchronous power distribution method based on a common circuit provided by the present invention; Figure 2 It is a distribution circuit connection mode of the multi-point synchronous power distribution method based on a common circuit provided by the present invention; Figure 3 It is a structural schematic diagram of a multi-point synchronous power distribution device based on a common circuit provided by the present invention; Figure 4 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Combine the following Figure 1-Figure 4 The invention describes a multi-point synchronous power distribution method and device based on a common circuit.

[0023] like Figure 1 As shown, the multi-point synchronous power distribution method based on a common circuit according to an embodiment of the present invention mainly includes step 110, step 120, step 130, step 140 and step 150.

[0024] Step 110, determine to connect each power cabinet supplying power to the same rail network to the same industrial frequency power grid.

[0025] The power demand within a factory or workshop is relatively complex, and the power directly output from the substation may not meet the special needs of all equipment. For example, some equipment requires different voltages, currents, or frequencies, or the waveform of the power supply may need to be adjusted. Therefore, multiple distribution cabinets must be set up inside the factory. These distribution cabinets adjust the power received from the substation through frequency conversion, voltage conversion, or other processing methods to adapt it to the needs of specific equipment.

[0026] In this embodiment, the automatic material handling system (AMHS) can replace manpower for material handling, which can greatly reduce the manpower of production line operations; at the same time, AMHS will greatly eliminate manual operation errors, improve environmental cleanliness, reduce vibration during handling, and greatly help improve product yield. These characteristics enable AMHS to fully reflect its value in the semiconductor manufacturing process. Therefore, AMHS is widely used in semiconductor manufacturing plants and is also used in pan-semiconductor industries such as panels and solar energy. The AMHS system includes a material handling overhead crane (OHT) as the core. The overhead crane walks along a predetermined track under the guidance of the track. The material transfer platform is located below the track and is set corresponding to the predetermined track. When the material handling overhead crane moves to the position corresponding to the material transfer platform, the workpiece container is lifted and moved, and the workpiece container is transferred between the material transfer platform. The overhead crane uses wireless power supply instead of traditional wired cable power supply. Specifically, the power supply on the overhead crane realizes wireless power supply by interacting with the excitation wire on the track.

[0027] The power pick-up on the overhead crane generates an induced current by cutting with the excitation wire (usually a wire with current) on the track. This induced current is used by the overhead crane to supply power, thus realizing wireless power supply.

[0028] In the overhead crane power supply system, multiple distribution cabinets are responsible for properly processing the power from the substation and supplying it to different rail equipment. Public grid power refers to the power obtained from external substations, but due to the particularity of internal demand, it needs to be processed by multiple distribution cabinets before being distributed to various devices. For example, city power can be used. As part of the public power system, city power usually refers to the alternating current supplied to various users such as households and factories through the power grid. Its characteristics include certain stability and standardization. City power usually provides stable voltage and frequency, which meets regional power standards.

[0029] Step 120, obtaining power parameters of the industrial frequency power grid through each power cabinet.

[0030] Power parameters include power grid voltage, phase and frequency. Each power cabinet usually needs to be equipped with a dedicated power monitoring device, which can monitor power parameters in real time. Common equipment includes power quality analyzers, current transformers, voltage transformers and smart meters. These devices can collect key parameters in the power system in real time, such as voltage, current, power, frequency, power factor, phase, etc.

[0031] Industrial frequency power grid refers to a power system or power network that operates at industrial frequency as the basic frequency. Industrial frequency usually refers to the frequency of alternating current, and has different standards in different regions.

[0032] As you can understand, voltage can be measured by a voltage transformer. The voltage transformer can reduce the high voltage to a level suitable for measurement. The power monitoring system will read this voltage value, usually monitoring the voltage of each phase (such as in a three-phase power system, monitoring the voltage of each phase separately).

[0033] Frequency refers to the speed at which the power cycle of the power grid changes. In an AC system, the frequency is usually fixed (for example, 50Hz or 60Hz). The monitoring device can calculate the frequency by collecting the periodic changes of the AC power.

[0034] Phase refers to the relative position of the current or voltage waveform, and is usually used to determine the phase sequence and phase angle of a multi-phase power system. Through the phase difference between current and voltage, the power monitoring system can calculate the phase of the voltage and current of each phase in real time, and then determine the working status of the power grid.

[0035] These monitoring devices not only collect power parameters in real time, but also transmit data to the centralized control system or upper management system. Common transmission methods include MODBUS communication protocol, wireless communication, and network connection (Ethernet).

[0036] The power monitoring equipment collects voltage, frequency and phase data, which will be transmitted to the central control system or management platform. Through this system, staff can view power parameters in real time. If some parameters exceed the set threshold, such as excessive voltage fluctuations or unstable frequency, the system will issue an alarm to prevent power failures in advance.

[0037] According to the power parameters fed back by the power monitoring system, the power output of each distribution cabinet can also be dynamically adjusted to ensure the safe and stable operation of the equipment.

[0038] By installing power monitoring devices in each electrical cabinet, real-time collection of power parameters such as voltage, frequency and phase can be carried out. Combined with data acquisition and communication systems, the power parameters of the industrial frequency power grid can be obtained accurately and timely. These data can help factories or workshops realize intelligent and automated power management, improve the stability of the power system and the operating efficiency of equipment.

[0039] Step 130, determine the phase of the industrial frequency power grid as the reference phase, and perform phase detection and compensation on the power input into the switch cabinet, so as to synchronize the phase of the power output of each switch cabinet as the reference phase.

[0040] In an AC system, phase refers to the relative position of a voltage or current waveform. For example, in a three-phase system, the voltage waveform of each phase will have a certain phase difference, generally at intervals of 120 degrees. Power signals from different circuits, distribution cabinets, or devices may have phase differences due to line length, load changes, device characteristics, and other reasons.

[0041] In this embodiment, a specific voltage or current signal can be selected as a reference, and the phase of this signal is set as a reference value, such as a phase angle of 0°. This reference phase is a phase from the power frequency power grid (it may be any one of the three phases), which serves as a reference for all power devices in the entire system and is used to synchronize the phases of other devices.

[0042] In the electrical cabinet, the power monitoring equipment needs to detect the phase of the power signal entering the cabinet. Through voltage transformers or other phase detection devices, the equipment can monitor the phase of the voltage waveform or current waveform entering the cabinet in real time. For example, in a three-phase power system, the cabinet will detect the phase of the three-phase voltage separately and determine the phase angle of each phase.

[0043] The purpose of phase compensation is to ensure that the phase of all power signals (such as voltage and current) in the electrical cabinet is consistent with the reference phase. Phase control devices such as phase compensation devices, digital signal processors, and phase calibration circuits are usually used to adjust the phase of the input electrical signal to align it with the reference phase.

[0044] The phase of the current waveform can be changed without changing the voltage and frequency by adjusting the control system of the power supply, for example, by using an electronic switch (such as a phase adjuster) to add or subtract a certain phase difference.

[0045] The purpose of phase synchronization is to synchronize the power signal in the switch cabinet with the reference phase of the power grid. In this way, both the equipment inside the switch cabinet and the current from the power grid will have the same phase relationship. This synchronization can effectively avoid power imbalance or overhead crane equipment failure caused by phase difference.

[0046] For the power input in each distribution cabinet, use power monitoring equipment such as a phase detector to detect the phase of the current or voltage entering each cabinet. For a three-phase power system, detect the phases of phases A, B, and C respectively.

[0047] Compare the phase of each phase of the electricity in the switch cabinet with the reference phase. Assuming the reference phase is the phase of phase A (0°), the other phases (such as phase B and phase C) should have a phase difference of 120° respectively. If the phase of the electricity in the switch cabinet does not match the reference phase, it needs to be adjusted.

[0048] A phase compensation device is used to adjust the phase of the electricity in the switch cabinet. The purpose of compensation is to make the phase of the electricity in the switch cabinet consistent with the reference phase of the power frequency grid.

[0049] If the electrical phase of a phase is offset, a phase delay or advance can be added through the control device to restore it to the correct reference phase.

[0050] For a three-phase system, the phases of the three-phase electricity must be kept at an interval of 120°, so when compensating, not only the offset relative to the reference phase must be considered, but also the phase difference between each two phases must be maintained.

[0051] In addition, power systems require constant monitoring and phase adjustment. The phase of a circuit may change due to load fluctuations or equipment changes. Therefore, the system usually dynamically adjusts the phase in real time to ensure that synchronization is always maintained.

[0052] In an overhead crane system that requires high-precision power control, it is necessary to ensure that the power system in each electrical cabinet is consistent with the reference phase, which can avoid load imbalance caused by phase difference and reduce the risk of electrical equipment failure.

[0053] In this embodiment, the phase of the industrial frequency power grid is determined as the reference phase, and the phase of the electricity input into the electrical cabinet is detected and compensated, so that the phase of the electricity in each electrical cabinet is the reference phase. This can ensure that the power signal in the electrical cabinet is consistent with the reference phase in the industrial frequency power grid. By detecting the phase of the input electricity and performing phase compensation adjustment, the phase of the electricity in the electrical cabinet is aligned with the reference phase, thereby ensuring the synchronization and stable operation of the power system.

[0054] Step 140 , performing frequency doubling processing on the compensated output power in the electric cabinet, so that the frequency of the output power of the electric cabinet is increased to the target frequency.

[0055] The target frequency is the frequency of the power output from the switchgear. In the power system, frequency refers to the periodic rate of change of the current or voltage waveform, and the unit is Hertz (Hz). For example, the standard frequency of AC power is usually 50 Hz or 60 Hz, depending on the regional standard.

[0056] In some applications, the equipment requires power of different frequencies to operate. Therefore, the power output frequency in the switch cabinet may need to be adjusted.

[0057] Frequency multiplication is a frequency conversion technology for power signals, which usually increases the frequency of the input electrical signal to the target frequency through certain electronic circuits or devices (such as frequency multipliers, inverters, etc.). For example, assuming that the frequency of the input power is 50Hz, the output frequency can be increased to 100 Hz, 150 Hz, or even higher through frequency multiplication.

[0058] Frequency doubling is actually achieved by adjusting the number of cycles of the current or voltage signal. In the power system, frequency doubling usually refers to increasing the signal of the base frequency to an integer multiple of its frequency. For example, increasing a 50 Hz signal to 100 Hz means that the cycle of the output power is half shorter than the cycle of the original frequency.

[0059] The target frequency refers to the specific value that the output frequency of the electrical cabinet needs to reach. This frequency is the required frequency for supplying power to electrical equipment such as overhead cranes.

[0060] Assume that the power input frequency in the electrical cabinet is 50 Hz, but the target frequency is 100 Hz (the target of frequency doubling). Then, through frequency doubling processing, the electrical cabinet will adjust the frequency of the output power from 50 Hz to 100 Hz, thereby meeting the requirements of the electrical equipment.

[0061] In some embodiments, the frequency multiplier converts the input signal frequency to a target frequency. The frequency multiplier can increase the input 50 Hz electrical signal to 100 Hz or higher frequency by changing the frequency of the voltage waveform.

[0062] In some embodiments, an inverter can also be used to adjust the frequency of the power supply. The inverter converts direct current (DC) into alternating current (AC) and can achieve frequency multiplication by controlling the output frequency.

[0063] Through frequency multiplication, the power output frequency in the power cabinet can be increased to the required target frequency, so that the cabinet can provide appropriate power for specific electrical equipment. Frequency multiplication is achieved through electronic circuits or devices, which increase the input frequency to the target frequency to ensure normal power supply of the equipment.

[0064] Step 150, connecting the output power of the power cabinet after frequency doubling processing to the track network to supply power to the track network.

[0065] After frequency doubling, the switch cabinet increases the frequency of its output power to the required target frequency, and then connects the adjusted power to the overhead crane's track network to provide the track network with power supply that meets the frequency requirements.

[0066] like Figure 2 As shown in the figure, a power supply line setting method is shown, from the first to the nth power cabinets are used to supply power to different areas of the overhead traveling vehicle's track network. The power frequency of the industrial frequency grid is 50Hz, and the voltage of the industrial frequency grid may be relatively high. After being stepped down by a transformer, the power of the industrial frequency grid is input to each power cabinet for phase synchronization and frequency multiplication. The frequency after frequency multiplication is 9.8kHz and is converted into direct current through a rectifier, which is input into the track network to supply the overhead traveling vehicle.

[0067] It is understandable that in power systems, especially when different power sources (panel A and panel B) are involved, even if the overhead crane experiences a brief power outage when switching, the phase difference between the power sources may still have an impact on the equipment. Especially in industrial environments, power sources are usually provided by different transformers, power supply lines or electrical control equipment, and their phases may not be completely consistent.

[0068] Even if the overhead crane is disconnected from the power supply, after the power supply switch is completed, the phase difference between the two power supplies may still cause the equipment to have a shock when the power supply is restored, or even cause a short-term power fluctuation. Such fluctuation may affect the operation stability of the overhead crane and even cause damage to the equipment.

[0069] At the moment of power switching, although there is a momentary interruption, when the current is restored, the current waveform changes instantaneously, generating an electrical shock. This shock is particularly obvious in high-load or precision equipment, and can easily cause damage to the electrical components of the overhead crane, or even cause the overhead crane to shut down or malfunction before the system is completely stable. This is like a transient overvoltage or current surge in the power system, which can affect power equipment even if it is short-lived.

[0070] The phase difference between power supply areas is usually affected by multiple factors such as the structure of the power grid, load distribution, and line length. In other words, even if there is a momentary interruption, the power supply system of the overhead crane may still be affected by these factors after restoration, resulting in unstable power supply.

[0071] Equipment such as overhead cranes are usually very sensitive to current waveform, phase and voltage, especially in high-precision control systems. Even a small phase fluctuation may cause a reaction in electrical components and affect the operation of the overhead crane.

[0072] For example, electric motor drive systems usually use AC motors, and motor control systems rely on stable power input. If the power phase changes, the torque, speed or power of the motor may be unstable instantaneously, causing equipment abnormality or shutdown.

[0073] In this case, in an embodiment of the present invention, the phase in the industrial frequency power grid is used as the reference phase, and the phase of the electricity input into the electric cabinet is detected and compensated, so that the phase of the electricity in each electric cabinet is the reference phase, and then the output electricity of each electric cabinet with the same phase after frequency doubling processing is connected to the rail network to supply power to the rail network, so that the power phase of the overhead crane that switches to draw power in different areas is the same.

[0074] It should be noted that even if the power in the industrial frequency power grid produces a certain phase error due to the fluctuation of the power grid, the phase of the power obtained by each switch cabinet is the same. For example, if the input of the switch cabinet comes from the same phase of the public grid mains, the input phase of each switch cabinet remains the same at the same moment. Even if the mains power has a phase drift, the input phase drift of each switch cabinet at the same moment must be the same. That is, in the embodiment of the present invention, phase synchronization has no requirements for the phase synchronization of the mains power. Even if the mains power phase drifts, the output phase of each switch cabinet at the same moment is always consistent.

[0075] According to the multi-point synchronous power distribution method based on a common circuit provided by an embodiment of the present invention, multiple power cabinets are connected to the same industrial frequency power grid, power parameters are obtained in real time and phase compensation is performed, and then the frequency of the power signal is increased by frequency multiplication processing, so that the frequency of the power signal meets the power supply demand of the rail network, and the output of each power cabinet is phase-locked and synchronized with the power signal to achieve power phase consistency. There is no need to add additional central synchronization equipment to communicate with each power cabinet, which saves a lot of communication equipment and wiring settings, and automatically realizes the synchronization and stability of power supply directly in each power cabinet, optimizes the quality of electricity, ensures that the overhead crane rail network can obtain stable and accurate power support, and ensures the stability of the overhead crane power supply.

[0076] In some embodiments, before the output electricity of the electrical cabinet after frequency doubling is connected to the rail network to supply power to the rail network, the multi-point synchronous power distribution method based on a common circuit of the present invention also includes: based on a reference phase, performing phase detection and compensation on the output electricity of the electrical cabinet after frequency doubling, so that the output electricity phase of each electrical cabinet after frequency doubling remains consistent.

[0077] It should be noted that if the designs of cabinets A and B are not exactly the same, for example, different types of power supply devices (different transformers, capacitor banks, etc.) are used, or different frequency multiplication devices are used for frequency multiplication, then the current phases between them may be inconsistent. In this case, even a short power outage and switchover will cause instantaneous current mismatch due to the phase difference.

[0078] In this case, based on the reference phase, the phase of the output electricity of the electric cabinet after the frequency doubling is detected and compensated, so that the output electricity phase of each electric cabinet remains consistent after the frequency doubling process.

[0079] It is understandable that by performing phase detection and compensation on the output power after frequency doubling to ensure that the current phases of each switchboard are consistent, the phase difference caused by the difference in switchboard configuration can be effectively avoided, thereby avoiding the possible instantaneous current mismatch. This compensation can prevent current shocks during power switching or interruption, reduce system fluctuations and equipment damage, and ensure the stability and reliability of the power supply system.

[0080] In some embodiments, after the output electricity of the electrical cabinet after frequency doubling processing is connected to the rail network to supply power to the rail network, the multi-point synchronous power distribution method based on a common circuit also includes: detecting power parameters in the rail network; when the power parameters of the rail network deviate, adjusting the power parameters of the output electricity of the electrical cabinet based on the reference phase so that the phase of the output electricity of each electrical cabinet is synchronized.

[0081] After the electrical cabinet connects the frequency-doubled power to the rail network, it is also necessary to monitor the power parameters of the overhead crane's rail network.

[0082] During the operation of the overhead crane, its load may change. For example, when the overhead crane is lifting, traveling or changing speed, the current and power demand will fluctuate. These load fluctuations will cause deviations in the voltage, frequency and phase in the power system.

[0083] If the power parameters of the rail network are found to be deviated, the output power parameters of the switchgear will be adjusted according to the reference phase to ensure that the power phases of each switchgear are always synchronized, thereby maintaining the stability of the power supply system.

[0084] In some embodiments, the output electricity of the electrical cabinet after frequency doubling is connected to the rail network to supply power to the rail network, which includes the following process.

[0085] The output power of each electrical cabinet after frequency doubling can be connected to the Litz wire of the corresponding track area in the track network.

[0086] When the overhead travelling crane travels from the first track area to the second track area, based on the track segment types of the first track area and the second track area, the driving member of the overhead travelling crane is controlled to adjust the power supply of the overhead travelling crane to switch from the Litz wire of the first track area to the Litz wire of the second track area. The phases of the electricity on the Litz wires of the first track area and the second track area are the same.

[0087] Tracks in different areas are powered by different switchboards. Assuming that the overhead crane first runs in the first track area of ​​the track network (for example, the area powered by switchboard A), the overhead crane's power supply obtains power from the Litz wire in this area. Then, the overhead crane starts to move to the second track area of ​​the track (the area powered by switchboard B).

[0088] When the overhead crane approaches a new power supply area, the power take-off will approach the new Litz wire system, and the new Litz wire is powered by switchboard B. When the overhead crane enters a new power supply area, if the phases are inconsistent, direct switching may cause instability or interference in the power supply.

[0089] The overhead crane's power take-off is adjusted by the drive to ensure that it is in normal contact with the new Litz wire. When entering a new power supply area, the power take-off automatically adjusts its direction, switches to the new Litz wire and starts supplying power from the new area.

[0090] At this point, the opening of the power take-off selectively aligns with the Litz wires of the new power supply area and begins to draw power from the new Litz wires.

[0091] Since the electricity phase on the Litz wire in the first track area and the second track area is the same, the current phase has been adjusted to be consistent during the switching process. When the overhead crane switches from the power supply area of ​​cabinet A to the power supply area of ​​cabinet B, the power supply remains stable and the current phase remains consistent.

[0092] This synchronization ensures smooth transition of the overhead crane between different power supply areas, avoiding power outages or instability.

[0093] In some embodiments, phase detection and compensation are implemented by a phase-locked loop circuit, which includes a phase detector, a voltage-controlled oscillator, and a feedback circuit connected to each other.

[0094] The phase detector is used to compare the phase difference between the reference phase and the signal output by the voltage controlled oscillator, and generate a reference phase control signal.

[0095] The voltage controlled oscillator is used to adjust the output signal according to the reference phase control signal so that the output electrical phase is the same as the reference phase.

[0096] The feedback circuit is used to feed back the signal output by the voltage controlled oscillator to the phase detector to form a closed-loop control.

[0097] The phase detector is used to compare the phase difference between the reference phase and the signal output by the voltage controlled oscillator. It generates a reference phase control signal indicating the phase difference between the two.

[0098] The voltage controlled oscillator adjusts its output frequency and phase according to the control signal provided by the phase detector, so that the phase of its output signal is consistent with the reference phase. In other words, the voltage controlled oscillator will adjust its working state according to the control signal so that the output signal is synchronized with the target phase.

[0099] In order to ensure continuous phase synchronization, the feedback circuit will feed the signal output by the voltage-controlled oscillator back to the phase detector, forming a closed-loop control system, which enables the phase-locked loop circuit to automatically adjust and compensate for the phase difference. Each time a phase difference is detected, the phase-locked loop circuit will quickly make adjustments until the phase of the output signal is completely consistent with the reference phase.

[0100] The phase-locked loop circuit continuously detects and adjusts the phase of the output signal through a closed-loop control system to ensure that it is consistent with the reference phase. In this way, the output electrical phase of different cabinets in the power system can be accurately synchronized, ensuring the stability of current and voltage and avoiding abnormal power supply from the overhead crane due to phase inconsistency.

[0101] In some embodiments, the phase detector further includes a low-pass filter, which is used to filter high-frequency noise in the output signal of the phase detector and retain a DC component representing the phase difference to generate a reference phase control signal to adjust the operating parameters of the voltage-controlled oscillator.

[0102] The phase detector generates an output signal by comparing the reference phase with the phase difference of the voltage controlled oscillator output signal. This output signal is usually a mixed signal containing high-frequency components and low-frequency components.

[0103] The low-pass filter is used to filter out the high-frequency noise in the output signal of the phase detector. In practical applications, there may be some irrelevant high-frequency noise components, which do not represent the actual information of the phase difference. The low-pass filter can filter out these high-frequency noises and only retain the low-frequency part, which is the DC component representing the phase difference.

[0104] The signal after passing through the low-pass filter is actually a DC signal, which contains the phase difference information between the reference signal and the output signal of the voltage-controlled oscillator. This DC signal can be used to control the operating parameters (such as frequency and phase) of the voltage-controlled oscillator so that the output of the voltage-controlled oscillator is consistent with the reference phase.

[0105] After filtering through a low-pass filter, the resulting DC signal is passed to the voltage-controlled oscillator as a reference phase control signal. This control signal adjusts the output of the voltage-controlled oscillator so that its phase is aligned with the reference phase.

[0106] In some embodiments, a digital circuit with the above functions implemented by a software program can also be used to process the power signal. The digital circuit can be used to analyze, detect and adjust the phase of the AC power using digital signal processing technology. The power signal (analog signal) is converted into a digital signal, and then a digital filter or algorithm is used to process these signals, and finally the phase synchronization is controlled by a digital-to-analog converter.

[0107] By digitizing the power signal, the digital signal processing process can calculate the phase offset of the signal and perform phase compensation at the output. The advantage of the digital signal processing process is that it can achieve highly accurate phase synchronization, especially in multi-frequency and multi-signal scenarios with better flexibility and accuracy.

[0108] The multi-point synchronous power distribution device based on a common circuit provided by the present invention is described below. The multi-point synchronous power distribution device based on a common circuit described below and the multi-point synchronous power distribution method based on a common circuit described above can be referenced to each other.

[0109] like Figure 3 As shown, the multi-point synchronous power distribution device based on a common circuit according to an embodiment of the present invention mainly includes an access module 310 , an acquisition module 320 , a first processing module 330 , a second processing module 340 and a third processing module 350 .

[0110] The access module 310 is used to determine that each power cabinet supplying power to the same rail network is connected to the same power frequency power grid; The acquisition module 320 is used to obtain the power parameters of the power grid through each power cabinet; the power parameters include the voltage, phase and frequency of the power grid; The first processing module 330 is used to determine the phase of the power grid as a reference phase, and perform phase detection and compensation on the power input into the electric cabinet, so as to synchronize the phase of the output power in each electric cabinet as the reference phase; The second processing module 340 is used to perform frequency doubling processing on the compensated output power in the electric cabinet, so that the frequency of the output power of the electric cabinet is increased to a target frequency; the target frequency is the frequency of the output power of the electric cabinet; The third processing module 350 is used to connect the output power of the power cabinet after the frequency doubling process to the track network to supply power to the track network.

[0111] According to the multi-point synchronous power distribution device based on a common circuit provided by an embodiment of the present invention, multiple power cabinets are connected to the same industrial frequency power grid to obtain power parameters in real time and perform phase compensation, and then the frequency of the power signal is increased by frequency multiplication processing, so that the frequency of the power signal meets the power supply demand of the rail network, and the output of each power cabinet is phase-locked and synchronized with the power signal to achieve power phase consistency. There is no need to add additional central synchronization equipment to communicate with each power cabinet, which saves a lot of communication equipment and wiring settings, and automatically realizes the synchronization and stability of power supply directly in each power cabinet, optimizes the quality of electricity, ensures that the overhead crane rail network can obtain stable and accurate power support, and ensures the stability of the overhead crane power supply.

[0112] Figure 4 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 4 As shown, the electronic device may include: a processor 410, a communication interface 420, a memory 430 and a communication bus 440, wherein the processor 410, the communication interface 420 and the memory 430 communicate with each other through the communication bus 440. The processor 410 may call the logic instructions in the memory 430 to execute a multi-point synchronous power distribution method based on a common circuit, the method comprising: determining that each electric cabinet supplying power to the same rail network is connected to the same power frequency power grid; obtaining power parameters of the power frequency power grid through each electric cabinet; the power parameters include the voltage, phase and frequency of the power frequency power grid; determining the phase of the power frequency power grid as the reference phase, and performing phase detection and compensation on the power input into the electric cabinet to synchronize the phase of the output power in each electric cabinet as the reference phase; performing frequency multiplication processing on the compensated output power in the electric cabinet so that the frequency of the output power of the electric cabinet is increased to the target frequency; the target frequency is the frequency of the output power of the electric cabinet; connecting the output power of the electric cabinet after frequency multiplication processing to the rail network to supply power to the rail network.

[0113] In addition, the logic instructions in the above-mentioned memory 430 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0114] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the multi-point synchronous power distribution method based on a common circuit provided by the above methods, which method includes: determining that each electrical cabinet that supplies power to the same rail network is connected to the same industrial frequency power grid; obtaining the power parameters of the industrial frequency power grid through each electrical cabinet; the power parameters include the voltage, phase and frequency of the industrial frequency power grid; determining the phase of the industrial frequency power grid as a reference phase, and performing phase detection and compensation on the electricity input into the electrical cabinet to synchronize the phase of the output power of each electrical cabinet as a reference phase; performing frequency doubling processing on the compensated output electricity in the electrical cabinet, so that the frequency of the output electricity of the electrical cabinet is increased to the target frequency; the target frequency is the frequency of the output power of the electrical cabinet; connecting the output electricity of the electrical cabinet after frequency doubling processing to the rail network to supply power to the rail network.

[0115] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the multi-point synchronous power distribution method based on a common circuit provided by the above-mentioned methods, the method comprising: determining that each electrical cabinet that supplies power to the same rail network is connected to the same industrial frequency power grid; obtaining the power parameters of the industrial frequency power grid through each electrical cabinet; the power parameters include the voltage, phase and frequency of the industrial frequency power grid; determining the phase of the industrial frequency power grid as a reference phase, and performing phase detection and compensation on the electricity input into the electrical cabinet to synchronize the phase of the output power of each electrical cabinet as a reference phase; performing frequency doubling processing on the compensated output electricity in the electrical cabinet so that the frequency of the output electricity of the electrical cabinet is increased to the target frequency; the target frequency is the frequency of the output power of the electrical cabinet; connecting the output electricity of the electrical cabinet after frequency doubling processing to the rail network to supply power to the rail network.

[0116] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0117] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-point synchronous power distribution method based on a common circuit, characterized in that: include: Make sure that all power cabinets supplying power to the same rail network are connected to the same power frequency power grid; Obtain power parameters of the industrial frequency power grid through each power cabinet; The power parameters include power grid voltage, phase and frequency; The phase of the industrial frequency power grid is determined as a reference phase, and the phase of the power input into the electric cabinet is detected and compensated, so as to synchronize the phase of the power output of each electric cabinet as the reference phase; The compensated output power in the electric cabinet is multiplied so that the frequency of the output power of the electric cabinet is increased to the target frequency; The target frequency is the frequency at which the electric cabinet outputs power; The output electricity of the electric cabinet after frequency doubling is connected to the track network to supply power to the track network.

2. The multi-point synchronous power distribution method based on a common circuit according to claim 1 is characterized in that: Before connecting the output power of the power cabinet after frequency doubling processing to the rail network to supply power to the rail network, the method further includes: Based on the reference phase, the output power of the switch cabinet after frequency doubling is phase-detected and compensated, so that the output power phase of each switch cabinet remains consistent after frequency doubling.

3. The multi-point synchronous power distribution method based on a common circuit according to claim 2 is characterized in that: Phase detection and compensation of the electricity is achieved through a phase-locked loop circuit, which includes a phase detector, a voltage-controlled oscillator and a feedback circuit connected to each other; The phase detector is used to compare the phase difference between the reference phase and the signal output by the voltage-controlled oscillator, and generate a reference phase control signal; The voltage controlled oscillator is used to adjust the output signal according to the reference phase control signal so that the phase of the output electricity is the same as the reference phase; The feedback circuit is used to feed back the signal output by the voltage-controlled oscillator to the phase detector to form a closed-loop control.

4. The multi-point synchronous power distribution method based on a common circuit according to claim 3 is characterized in that: The phase detector further comprises a low-pass filter, which is used to filter high-frequency noise in the output signal of the phase detector and retain a DC component representing the phase difference to generate the reference phase control signal to adjust the working parameters of the voltage-controlled oscillator.

5. The multi-point synchronous power distribution method based on a common circuit according to claim 1 is characterized in that: After the output power of the power cabinet after the frequency doubling process is connected to the track network to supply power to the track network, the method further includes: detecting power parameters in the rail network; In the case where the power parameters of the rail network deviate, the power parameters of the output power of the power cabinets are adjusted based on the reference phase so that the phases of the output power of each power cabinet are synchronized.

6. The multi-point synchronous power distribution method based on a common circuit according to claim 1 is characterized in that: The step of connecting the output power of the power cabinet after frequency doubling to the track network to supply power to the track network includes: Connecting the output power of each electric cabinet after frequency doubling processing to the Litz wire of the corresponding track area in the track network; When the overhead crane travels from the first track area to the second track area, based on the track segment types of the first track area and the second track area, the driving parts of the overhead crane are controlled to adjust the power supply of the overhead crane to switch from the Litz wire of the first track area to the Litz wire of the second track area; the phase of the electricity on the Litz wire of the first track area and the second track area is the same.

7. A multi-point synchronous power distribution device based on a common circuit, characterized in that: The access module is used to determine that each electric cabinet supplying power to the same rail network is connected to the same power frequency power grid; An acquisition module is used to acquire power parameters of the power grid through each power cabinet; the power parameters include voltage, phase and frequency of the power grid; A first processing module is used to determine the phase of the power frequency power grid as a reference phase, and perform phase detection and compensation on the power input into the electric cabinet to synchronize the phase of the power output of each electric cabinet as the reference phase; The second processing module is used to perform frequency doubling processing on the output power after compensation in the electric cabinet, so that the frequency of the output power of the electric cabinet is increased to the target frequency; The target frequency is the frequency at which the electric cabinet outputs power; The third processing module is used to connect the output electricity of the electric cabinet after frequency doubling processing to the track network to supply power to the track network.

8. An electric cabinet, characterized in that: include: A cabinet and a power distribution system arranged in the cabinet, wherein the power distribution system comprises an input module and an output module, wherein the input module is used to access the industrial frequency power grid, and the output module is used to access the track network of the overhead travelling vehicle; The power distribution system distributes power to the track network of the overhead travelling vehicle using the multi-point synchronous power distribution method based on a common circuit as described in any one of claims 1 to 6.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that: When the processor executes the program, the multi-point synchronous power distribution method based on a common circuit as described in any one of claims 1 to 6 is implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the multi-point synchronous power distribution method based on a common circuit as claimed in any one of claims 1 to 6 is implemented.

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