Elevator energy feedback monitoring system

Abstract

An elevator energy feedback monitoring system comprises at least one elevator energy feedback device, the elevator energy feedback device comprises a control unit, an IGBT module, a filtering module and a wireless communication module, and the control unit is in two-way communication with a cloud platform through the wireless communication module; the control unit is further electrically connected with the IGBT module, and the IGBT module is electrically connected with a three-phase power grid and an elevator frequency converter direct-current bus through the filtering module. A direct-current voltage detection sensor is arranged at the output end of the elevator frequency converter direct-current bus and connected with the input end of the control unit. According to the utility model, the effective utilization of energy is realized, the energy waste is reduced, and the matching of the energy feedback quantity of an elevator system and the load of a power grid can be ensured, so that the stability of the voltage and frequency of the power grid can be maintained, the impact on a micro-grid in a transformer area is prevented, and the safe operation of electrical equipment is ensured.

Description

Technical Field

[0001] This utility model relates to the field of elevator monitoring technology, and in particular to an elevator energy feedback monitoring system. Background Technology

[0002] As people become more aware of energy conservation and environmental protection, elevator energy feedback devices in high-rise buildings are gradually becoming more widespread. These devices convert the potential energy generated during the elevator's descent into electrical energy, which is then fed back into the power grid, effectively reducing energy waste.

[0003] However, traditional elevator energy feedback devices mostly lack monitoring and exist only as independent electrical equipment, failing to dynamically control their start and stop in conjunction with the operation of the power grid within the distribution area. Specifically, these devices cannot monitor power grid load fluctuations in real time during operation and cannot automatically adjust their start / stop or output power based on the real-time status of the power grid. When the elevator's energy feedback amount is mismatched with the power grid load, it may lead to voltage fluctuations or frequency instability in the power grid. When there is an imbalance between the power consumption side and the power generation side, it can cause a certain impact on the microgrid within the distribution area, affecting the operational safety of electrical equipment. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings of the prior art and provide an elevator energy feedback monitoring system with good safety and high system stability.

[0005] The technical solution of this utility model is: an elevator energy feedback monitoring system, including at least one elevator energy feedback device. The elevator energy feedback device includes a control unit, an IGBT module, a filter module, and a wireless communication module. The control unit communicates bidirectionally with a cloud platform through the wireless communication module. The control unit is also electrically connected to the IGBT module. The IGBT module is electrically connected to the three-phase power grid and the DC bus of the elevator inverter through the filter module. The output terminal of the DC bus of the elevator inverter is equipped with a DC voltage detection sensor, which is connected to the input terminal of the control unit.

[0006] Furthermore, the IGBT module adopts an IGBT board, including a three-phase IGBT inverter bridge circuit, which is used to invert the DC power fed back by the elevator into three-phase AC power and send it to the power grid.

[0007] Furthermore, the filtering module includes a DC filter and an AC filter. The AC filter is connected between the AC output terminal of the IGBT module and the three-phase power grid to filter the AC power output by the IGBT module before feeding it into the power grid. The DC filter is connected between the DC input terminal of the IGBT module and the output terminal of the DC bus of the elevator inverter to filter the DC power output by the DC bus of the elevator inverter and send it to the IGBT module.

[0008] Furthermore, the IGBT module is electrically connected to the three-phase power grid and the DC bus of the elevator inverter through a filter module and an interface module, respectively; the output terminal of the AC filter is connected to the three-phase power grid through the interface module; and the output terminal of the DC bus of the elevator inverter is connected to the input terminal of the DC filter through the interface module.

[0009] Furthermore, the transformer output terminal of the distribution area is connected to the three-phase 380V bus, which provides AC power to multiple elevators and other electrical equipment. Each elevator corresponds to one of the aforementioned elevator energy feedback devices.

[0010] Furthermore, the elevator energy feedback monitoring system also includes an energy detection unit, comprising a current sensor for detecting three-phase current and an AC voltage sensor for detecting three-phase voltage. The current sensor is located at the AC output terminal of the IGBT module; the voltage sensor is located at the input terminal of the three-phase power grid; and there are three current sensors and three voltage sensors.

[0011] Furthermore, the control unit adopts a DSP control board, and the central processing unit is a DSP chip.

[0012] Furthermore, the wireless communication module is a 4G wireless communication module or a 5G wireless communication module.

[0013] The beneficial effects of this utility model are:

[0014] (1) By setting a DC voltage detection sensor at the output end of the DC bus of the elevator inverter, the voltage value of the DC bus of the elevator inverter can be monitored in real time, and it can be detected in time whether the voltage exceeds the set threshold. This can help the system identify voltage abnormalities in advance and take corresponding protection measures to avoid damage to the elevator inverter, IGBT module and other electrical components due to voltage fluctuations or excessive voltage. On the other hand, when the DC bus voltage is too high, it means that the elevator system is generating too much energy. For example, during the descent of the elevator, inertial energy will be converted into electrical energy and charged to the DC bus. At this time, by starting the IGBT module, the excess DC energy can be inverted into three-phase AC power and fed back to the grid. This not only prevents voltage runaway in the elevator system, but also realizes the effective use of energy, reduces energy waste, and avoids grid voltage fluctuations, maintaining grid stability.

[0015] (2) By setting up an energy detection unit and combining it with a DC voltage detection sensor, it can be ensured that the energy feedback of the elevator system matches the grid load, thereby helping to maintain the stability of the grid voltage and frequency, preventing impact on the microgrid in the transformer area, and ensuring the safe operation of electrical equipment.

[0016] (3) By setting up an interface module, the IGBT module can be easily connected to the three-phase power grid and the DC bus of the elevator frequency converter through the filter module; at the same time, the interface module can also provide voltage sampling points to facilitate the detection of voltage sensors. Attached Figure Description

[0017] Figure 1 This is a schematic block diagram of a system according to an embodiment of the present utility model;

[0018] Figure 2 This is a schematic block diagram of the elevator energy feedback device according to an embodiment of this utility model;

[0019] Figure 3 This is a schematic diagram of the circuit principle of the elevator energy feedback device according to an embodiment of this utility model. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 The system illustrates an elevator energy feedback monitoring system, comprising at least one elevator energy feedback device and an energy detection unit for measuring the power consumption of the three-phase busbar. In this embodiment, one elevator corresponds to one elevator energy feedback device. For example, the transformer output of the transformer substation is connected to a three-phase 380V busbar, which can provide AC power to multiple elevators, such as elevator 1, elevator 2, and other electrical equipment. Elevator energy feedback device 1 is connected to elevator 1, and elevator energy feedback device 2 is connected to elevator 2. Both elevator energy feedback devices communicate bidirectionally with a cloud platform. The energy detection unit is used to measure the current, voltage, and other power consumption information of the three-phase 380V busbar in real time. This information can be transmitted wirelessly to the cloud platform independently, or the sensors of the energy detection unit can be connected to the elevator energy feedback devices, which then communicate with the cloud platform. The cloud platform controls the start and stop of the elevator energy feedback devices based on the actual power consumption of the transformer substation.

[0022] The following is a preferred embodiment of this utility model:

[0023] like Figure 2 and Figure 3 As shown: In this embodiment, the elevator energy feedback device includes a DSP control unit, an IGBT module, a filter module, a wireless communication module, and an interface module; the DSP control unit communicates bidirectionally with the cloud platform through the wireless communication module; the DSP control unit is also electrically connected to the IGBT module, and the IGBT module is electrically connected to the three-phase power grid and the DC bus of the elevator inverter through the filter module and the interface module, respectively.

[0024] Specifically, the interface module is used for power input and output connection to ensure reliable and stable power transmission between different circuits or devices. This embodiment preferably uses a power interface board to provide an electrical interface between the IGBT module and the three-phase power grid and the DC bus of the elevator inverter. Fuses can be installed on the power input and output paths so that when the current in the circuit exceeds the fuse's rated value, the fuse can quickly melt and cut off the current, thereby protecting the circuit from damage.

[0025] In this embodiment, the IGBT module uses an IGBT board, including a three-phase IGBT inverter bridge circuit, which is used to invert the DC power fed back from the elevator into three-phase AC power and send it to the power grid. Since the three-phase IGBT inverter bridge circuit is existing technology, it will not be described in detail here.

[0026] In this embodiment, the filtering module includes a DC filter and an AC filter. The AC filter is connected between the AC output terminal of the IGBT board and the input interface of the power interface board, and is connected to the three-phase power grid via the power interface board. It is used to filter the AC power output from the IGBT board before feeding it into the power grid. The DC filter is connected between the DC input terminal of the IGBT board and the output interface of the power interface board, and is connected to the DC bus of the elevator inverter via the power interface board. It is used to filter the DC power output from the DC bus of the elevator inverter and send it to the IGBT board. The DC power fed back from the elevator is inverted into three-phase AC power by the three-phase IGBT inverter bridge circuit and then sent to the power grid. Preferably, the AC filter can be an inductive filter, such as an LC filter. The DC filter can be a common rectifier circuit.

[0027] In this embodiment, the DSP control unit uses a DSP control board, and the central processing unit is a DSP chip, responsible for logic control and data processing. This embodiment preferably uses an existing DSP control board. The wireless communication module is preferably a 4G wireless communication module, through which the DSP control unit communicates wirelessly with the cloud platform.

[0028] In this embodiment, the power detection unit includes three current sensors and three AC voltage sensors, and each sensor is connected to the DSP control board.

[0029] The current sensors are Hall effect current sensors. Preferably, three Hall effect current sensors are located at the AC output terminals of the three-phase IGBT inverter bridge circuit. Each of the three Hall effect current sensors measures the current of one of the three phases, meaning each sensor is positioned on the current path of each phase and connected to the input terminal of the DSP control board. This allows for real-time monitoring of the three-phase AC current after inversion and the transmission of the current detection information to the DSP control board. By placing the three Hall effect current sensors at the AC output terminals of the IGBT module, the changes in the three-phase current can be monitored in real time, ensuring stable system operation and reflecting the effectiveness of elevator energy feedback.

[0030] The AC voltage sensor can be a voltage transformer, etc. Preferably, three AC voltage sensors are located between the power interface board and the output terminal of the three-phase power grid. That is, a three-phase sampling interface of the power grid can be set on the power interface board. For a three-phase 380V voltage system, the three AC voltage sensors monitor the voltage of the three-phase AC power (phase A, phase B, and phase C) respectively, and send the voltage detection information to the DSP control board.

[0031] The analog signals from the aforementioned sensors are converted into digital signals by the analog-to-digital converter chip on the DSP control board and sent to the DSP processor for processing and analysis. It can also obtain the power information of the three-phase AC bus and transmit it to the cloud platform through the wireless communication module. The cloud platform determines the grid load and the timing of elevator energy feedback based on the actual power consumption of the transformer area. If the grid load is high or there is a large demand for electricity, the cloud platform will activate the elevator energy feedback device to transfer the braking energy of the elevator back to the grid to reduce the grid load. If the grid load of the transformer area is light or the energy fed back by the elevator is large, the cloud platform may choose to stop the feedback to avoid problems such as grid voltage fluctuations caused by excessive feedback.

[0032] In this embodiment, a DC voltage sensor, such as a voltage transmitter, is provided at the output end of the DC bus of the elevator inverter. The DC voltage sensor is connected to the input end of the DSP control board and is used to send the detected voltage information to the DSP control board to determine whether the DC bus voltage of the elevator exceeds the set threshold. If it exceeds the threshold, the IGBT module is controlled to invert the DC power into three-phase AC power, which is then filtered by the AC filter and connected to the power grid.

[0033] In this embodiment, the output terminal of the IGBT board is also electrically connected to the fan. The DSP control board is used to send fan start / stop information to the IGBT board so that the IGBT board can control the fan to start / stop and dissipate heat from the IGBT board.

[0034] In this embodiment, the input terminal of the DSP control board is also connected to a temperature sensor for detecting the temperature of the DSP control board.

[0035] In this embodiment, the DSP control board is also connected to a display via an RS485 interface for power indication, monitoring indication, enable operation indication, fault indication, parameter modification indication, rectification feedback / feedback status indication, etc.

[0036] The working principle of this embodiment is as follows: The DSP control board transmits the detected actual power consumption of the elevator area and the elevator's operating status to the cloud platform in real time via a wireless communication module. The cloud platform can then issue control commands to start and stop the equipment. For example, when the DSP control board detects a run command, it determines whether the DC bus voltage of the elevator inverter exceeds a set threshold. If it does, it activates the IGBT module, which uses a three-phase IGBT inverter bridge circuit to convert the DC power into three-phase AC power. After filtering by an AC filter, the AC power is fed into the power grid. When the DSP control unit detects a stop command or the DC bus voltage does not reach the set threshold, the system enters a silent state. Additionally, three current sensors monitor the three-phase AC current of the elevator energy feedback device in real time. This current information reflects the effectiveness of the elevator energy feedback, especially the energy feedback to the power grid during elevator braking. Three AC voltage sensors monitor the three-phase voltage of the power grid, helping the cloud platform understand the grid's stability in real time. The power of the three-phase AC bus can also be indirectly obtained from the acquired three-phase AC current and voltage. For example, when the three-phase current and power are detected to be higher than the preset upper limits of current and power, the cloud platform will send instructions to the DSP control board to adjust the working status of the elevator energy feedback device or enable / disable the feedback device to ensure that the system operates in a safe and stable working state and prevent the power grid from overloaded or the equipment from being damaged.

Claims

1. An elevator energy feedback monitoring system, characterized in that, The system includes at least one elevator energy feedback device, which comprises a control unit, an IGBT module, a filter module, and a wireless communication module. The control unit communicates bidirectionally with a cloud platform via the wireless communication module. The control unit is also electrically connected to the IGBT module, which is electrically connected to the three-phase power grid and the DC bus of the elevator inverter via the filter module. The output terminal of the DC bus of the elevator inverter is equipped with a DC voltage detection sensor, which is connected to the input terminal of the control unit.

2. The elevator energy feedback monitoring system according to claim 1, characterized in that, The IGBT module uses an IGBT board, including a three-phase IGBT inverter bridge circuit, which is used to invert the DC power fed back by the elevator into three-phase AC power and send it to the power grid.

3. The elevator energy feedback monitoring system according to claim 1 or 2, characterized in that, The filtering module includes a DC filter and an AC filter. The AC filter is connected between the AC output terminal of the IGBT module and the three-phase power grid to filter the AC power output by the IGBT module before feeding it into the power grid. The DC filter is connected between the DC input terminal of the IGBT module and the output terminal of the DC bus of the elevator inverter to filter the DC power output by the DC bus of the elevator inverter and send it to the IGBT module.

4. The elevator energy feedback monitoring system according to claim 3, characterized in that, The IGBT module is electrically connected to the three-phase power grid and the DC bus of the elevator inverter through a filter module and an interface module, respectively; the output of the AC filter is connected to the three-phase power grid through the interface module; and the output of the DC bus of the elevator inverter is connected to the input of the DC filter through the interface module.

5. The elevator energy feedback monitoring system according to claim 1, characterized in that, The transformer output terminal of the distribution area is connected to the three-phase 380V bus. The three-phase 380V bus provides AC power to multiple elevators and other electrical equipment. Each elevator corresponds to one of the aforementioned elevator energy feedback devices.

6. The elevator energy feedback monitoring system according to claim 1, characterized in that, The elevator energy feedback monitoring system also includes an energy detection unit, which includes a current sensor for detecting three-phase current and an AC voltage sensor for detecting three-phase voltage. The current sensor is located at the AC output terminal of the IGBT module; the voltage sensor is located at the input terminal of the three-phase power grid; and there are three current sensors and three voltage sensors.

7. The elevator energy feedback monitoring system according to claim 1, characterized in that, The control unit uses a DSP control board, and the central processing unit is a DSP chip.

8. The elevator energy feedback monitoring system according to claim 1, characterized in that, The wireless communication module is either a 4G wireless communication module or a 5G wireless communication module.

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