Variable-frequency power supply control system

Abstract

The utility model provides a variable-frequency power supply control system, and belongs to the technical field of variable-frequency power supplies. The variable-frequency power supply control system comprises a rectifier, a filter, an inverter, a control unit, a voltage compensation unit and a first switch unit, the first end of the first switch unit is connected with a power grid, the second end of the first switch unit is connected with the first end of the rectifier, and the control end of the first switch unit is connected with the control unit; the second end of the rectifier is connected with the first end of the filter, the second end of the filter is connected with the first end of the inverter and the first end of the voltage compensation unit, the second end of the inverter is used for being connected with a ship intranet, the third end of the inverter is connected with the control unit, and the second end of the voltage compensation unit is connected with the control unit. According to the invention, the output stability of the power grid voltage can be ensured through real-time voltage compensation, and the anti-interference performance and adaptability of the system are enhanced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of variable-frequency power supplies, and particularly to a variable-frequency power supply control system. Background Art

[0002] With the rapid progress of power electronics technology, variable-frequency power supplies, as a kind of power supply equipment that can output a pure sine wave with adjustable frequency and voltage and small waveform distortion, are increasingly widely used. Especially in the fields of industrial production, electronic equipment, new energy, and transportation, variable-frequency power supplies play a crucial role. However, with the continuous improvement of application requirements, higher requirements are put forward for the performance, stability, reliability, and intelligence level of variable-frequency power supply control systems. The existing variable-frequency power supply control systems have poor stability and it is difficult to ensure a stable voltage output to the load. Utility Model Content

[0003] Embodiments of the present disclosure provide a variable-frequency power supply control system to solve the problem of poor stability of the existing variable-frequency power supply control systems.

[0004] Embodiments of the present disclosure provide a variable-frequency power supply control system, including:

[0005] A rectifier, a filter, an inverter, a control unit, a voltage compensation unit, and a first switch unit;

[0006] The first end of the first switch unit is used to connect to the power grid, the second end of the first switch unit is connected to the first end of the rectifier, and the control end of the first switch unit is connected to the control unit;

[0007] The second end of the rectifier is connected to the first end of the filter, the second end of the filter is respectively connected to the first end of the inverter and the first end of the voltage compensation unit, the second end of the inverter is used to connect to the ship's internal network, the third end of the inverter is connected to the control unit, and the second end of the voltage compensation unit is connected to the control unit.

[0008] In an exemplary embodiment of the present disclosure, a variable-frequency power supply control system further includes:

[0009] A drive unit;

[0010] The first end of the drive unit is connected to the third end of the inverter, and the second end of the drive unit is connected to the control unit.

[0011] In an exemplary embodiment of the present disclosure, a variable-frequency power supply control system further includes:

[0012] A voltage detection unit, an energy storage unit, a second switch unit, and a boost unit;

[0013] The first end of the voltage detection unit is connected to the second end of the rectifier, and the second end of the voltage detection unit is connected to the control unit;

[0014] The first end of the second switch unit is connected to the energy storage unit, the second end of the second switch unit is connected to the boost unit, and the control end of the second switch unit is connected to the control unit;

[0015] The second end of the boost unit is connected to the second end of the rectifier.

[0016] In an exemplary embodiment of the present disclosure, a variable frequency power supply control system further includes:

[0017] An over-discharge detection unit;

[0018] The first end of the over-discharge detection unit is connected to the first end of the second switch unit, and the second end of the over-discharge detection unit is connected to the control unit.

[0019] In an exemplary embodiment of the present disclosure, a variable frequency power supply control system further includes:

[0020] A third switch unit and a charging unit;

[0021] The first end of the charging unit is connected to the first end of the rectifier, the second end of the charging unit is connected to the first end of the third switch unit, the second end of the third switch unit is connected to the first end of the second switch unit, and the control end of the third switch unit is connected to the control unit.

[0022] In an exemplary embodiment of the present disclosure, a variable frequency power supply control system further includes:

[0023] A wireless communication unit;

[0024] The wireless communication unit is connected to the control unit.

[0025] In an exemplary embodiment of the present disclosure, a variable frequency power supply control system further includes:

[0026] A temperature detection unit;

[0027] The temperature detection unit is connected to the control unit and is used to collect the temperature of the inverter.

[0028] The beneficial effects of a variable frequency power supply control system provided by an embodiment of the present disclosure are:

[0029] The present disclosure realizes stable and efficient frequency conversion from the power grid to the ship's internal network by integrating a rectifier, a filter, an inverter, and a control unit, combined with a voltage compensation unit and a first switch unit. This system can effectively filter out power grid harmonics, provide pure electric energy, ensure stable output through real-time voltage compensation, and enhance the anti-interference ability and stability of the system. At the same time, the control unit can accurately regulate, improve energy utilization efficiency, reduce energy consumption and failure rate, and provide reliable and flexible power guarantee for ship operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 FIG. is a schematic structural diagram of a variable frequency power supply control system provided by an embodiment of the present disclosure;

[0032] Figure 2 FIG. is a schematic structural diagram of a variable frequency power supply control system provided by another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] In order to enable those skilled in the art to better understand this solution, the following will clearly describe the technical solutions in the embodiments of this solution in conjunction with the drawings in the embodiments of this solution. Obviously, the described embodiments are some, but not all, of the embodiments of this solution. Based on the embodiments in this solution, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this solution.

[0034] The term "including" and any other variations in the description and claims of this solution and the above-mentioned drawings mean "including but not limited to", intending to cover non-exclusive inclusion and not limited to the examples listed in the text. In addition, terms such as "first" and "second" are used to distinguish different objects, rather than to describe a specific order.

[0035] The following will describe the implementation of the present disclosure in detail with reference to specific drawings:

[0036] Figure 1 FIG. is a schematic structural diagram of a variable frequency power supply control system provided by an embodiment of the present disclosure. Refer to Figure 1 , this variable frequency power supply control system includes:

[0037] A rectifier 11, a filter 12, an inverter 13, a control unit 14, a voltage compensation unit 15, and a first switch unit 16;

[0038] The first end of the first switch unit 16 is used to connect to the power grid, the second end of the first switch unit 16 is connected to the first end of the rectifier 11, and the control end of the first switch unit 16 is connected to the control unit 14;

[0039] The second end of the rectifier 11 is connected to the first end of the filter 12, the second end of the filter 12 is respectively connected to the first end of the inverter 13 and the first end of the voltage compensation unit 15, the second end of the inverter 13 is used to connect to the ship's internal network, the third end of the inverter 13 is connected to the control unit 14, and the second end of the voltage compensation unit 15 is connected to the control unit 14.

[0040] In this embodiment, the first switch unit 16 is disposed between the power grid and the rectifier 11 and is responsible for controlling the access of the power grid electric energy. When it is necessary to transmit the power grid voltage to the ship's internal network, the control unit 14 will control the first switch unit 16 to close, allowing the power grid electric energy to flow into the system.

[0041] The rectifier 11 can convert the alternating current of the power grid into direct current. The filter 12 is used to smooth the direct current output by the rectifier 11, reduce the voltage ripple, and improve the power quality. The filter 12 usually includes components such as capacitors and inductors, and can effectively reduce the high-frequency components in the direct current voltage. The inverter 13 can convert the filtered direct current into alternating current with a specific frequency and voltage, and output the alternating current to the ship's internal network to meet the requirements of the ship's internal network.

[0042] The voltage compensation unit 15 is connected in parallel with the rectifier 11 and is used to compensate for the voltage drop caused by factors such as line resistance and load change, and ensure that the voltage at the power supply output end is stable within the set value range. The voltage drop compensation unit monitors the voltage value at the power supply output end in real time through a built-in sensor or measurement circuit, and compares it with the target voltage value. When it is found that the actual voltage is lower than the target voltage, that is, there is a voltage drop, the compensation unit will start the compensation mechanism. According to the detected magnitude of the voltage drop, the voltage drop compensation unit adjusts the working state of its internal circuit (such as a boost circuit, a voltage stabilizing circuit, etc.) to increase the amplitude of the output voltage to compensate for the voltage drop in the system. The control unit 14 is responsible for detecting the power grid voltage and frequency, and adjusting the operating state of the system according to this information. For example, when the power grid voltage fluctuates, the control unit 14 will adjust the output voltage and frequency of the inverter 13 to ensure stable output. The control unit 14 and the voltage drop compensation unit can form a closed-loop control system. The control unit 14 continuously adjusts its control strategy according to the feedback signal, while the voltage drop compensation unit adjusts the output voltage in real time according to the control signal. Through this closed-loop control method, it can be ensured that the voltage at the power supply output end is always stable within the set value range.

[0043] As can be seen from the above, the present disclosure realizes stable and efficient frequency conversion from the power grid to the ship's internal network by integrating a rectifier 11, a filter 12, an inverter 13 and a control unit 14, in combination with a voltage compensation unit 15 and a first switch unit 16. This system can effectively filter out power grid harmonics, provide pure electric energy, ensure stable output through real-time voltage compensation, and enhance the anti-interference ability and stability of the system. At the same time, the control unit 14 can accurately regulate, improve energy utilization efficiency, reduce energy consumption and failure rate, and provide reliable and flexible power guarantee for ship operation.

[0044] In an embodiment of the present disclosure, referring to Figure 2 , a variable frequency power supply control system further includes:

[0045] A drive unit 17;

[0046] The first end of the drive unit 17 is connected to the third end of the inverter 13, and the second end of the drive unit 17 is connected to the control unit 14.

[0047] In this embodiment, the drive unit 17 can receive a control signal from the control unit 14, amplify and perform necessary format conversion on it, so that it can effectively drive the power switching elements in the inverter 13, such as IGBT (Insulated Gate Bipolar Transistor) or MOSFET (Metal Oxide Semiconductor Field Effect Transistor), etc.

[0048] The control unit 14 can generate a corresponding control signal according to the changes in the power grid voltage and frequency, and send this control signal to the drive unit 17. The drive unit 17 receives the control signal from the control unit 14, amplifies and converts it to meet the requirements of the power switching elements in the inverter 13. The drive signal output by the drive unit 17 controls the conduction and cut-off of the power switching elements in the inverter 13, realizing the conversion from direct current to alternating current.

[0049] As can be seen from the above, the drive unit 17 in this embodiment effectively enhances the stability and efficiency of the system. It not only amplifies and converts the signal of the control unit 14 to accurately drive the inverter 13, but also provides necessary protection measures to ensure the safe operation of the power switch.

[0050] In an embodiment of the present disclosure, referring to Figure 2 , a variable frequency power supply control system further includes:

[0051] A voltage detection unit 18, an energy storage unit 19, a second switch unit 20 and a boost unit 21;

[0052] The first end of the voltage detection unit 18 is connected to the second end of the rectifier 11, and the second end of the voltage detection unit 18 is connected to the control unit 14;

[0053] The first end of the second switching unit 20 is connected to the energy storage unit 19, the second end of the second switching unit 20 is connected to the boost unit 21, and the control end of the second switching unit 20 is connected to the control unit 14;

[0054] The second end of the boost unit 21 is connected to the second end of the rectifier 11.

[0055] In this embodiment, the variable frequency power supply control system further includes components such as a voltage detection unit 18, an energy storage unit 19, a second switching unit 20, and a boost unit 21. These components can improve the stability and reliability of the system, especially in the case of large fluctuations in the grid voltage.

[0056] The control unit 14 can judge the working state of the power grid (large fluctuations in the grid voltage or a fault occurs) according to the voltage value detected by the voltage detection unit 18. When it detects that the voltage output by the power grid is lower than the preset threshold, it controls the second switching unit 20 to close, so that the energy storage unit 19 can output a suitable DC voltage to the inverter 13 through the second switching unit 20 and the boost unit 21 to ensure the uninterrupted power supply of the ship.

[0057] The specific working process of this embodiment is as follows:

[0058] Normal working mode:

[0059] The electric energy of the power grid enters the rectifier 11 through the first switching unit 16. The rectifier 11 converts the AC voltage into a DC voltage. The filter 12 smooths the DC voltage output by the rectifier 11. The inverter 13 converts the smoothed DC voltage into an AC voltage and outputs it to the ship's internal network. During this period, the voltage detection unit 18 can continuously monitor the DC voltage output by the rectifier 11 and judge the working state of the power grid.

[0060] Power grid fault mode:

[0061] When the control unit 14 judges that the DC voltage output by the rectifier 11 detected by the voltage detection unit 18 is lower than the preset threshold, it controls the second switching unit 20 to close. The energy storage unit 19 provides electric energy to the boost unit 21 through the second switching unit 20. The boost unit 21 boosts the DC voltage provided by the energy storage unit 19 to the required working voltage. The boosted voltage can ensure the stability of the AC voltage output by the inverter 13.

[0062] Recovery mode:

[0063] When the grid voltage returns to normal, the voltage detection unit 18 detects that the DC voltage output by the rectifier 11 returns to the normal range. The control unit 14 controls the second switch unit 20 to disconnect, and the energy storage unit 19 stops supplying power to the boost unit 21. The system resumes the normal working mode, and the grid power supplies power to the ship's internal network through the variable frequency power supply control system.

[0064] It can be concluded from the above that the variable frequency power supply control system of this embodiment realizes flexible monitoring and regulation of the rectified voltage by integrating the voltage detection, energy storage, switch control and boost unit 21. This system can automatically respond to voltage fluctuations, use the energy storage unit 19 to stabilize the power supply, and cooperate with the boost unit 21 by controlling the second switch unit 20 to boost the output voltage when necessary, enhancing the stability and adaptability of the system, ensuring the continuity of the power output, and effectively improving the overall performance and reliability of the variable frequency power supply control system.

[0065] In an embodiment of the present disclosure, referring to Figure 2 , a variable frequency power supply control system further includes:

[0066] An over-discharge detection unit 22;

[0067] The first end of the over-discharge detection unit 22 is connected to the first end of the second switch unit 20, and the second end of the over-discharge detection unit 22 is connected to the control unit 14.

[0068] In this embodiment, the first end of the over-discharge detection unit 22 is connected to the first end of the second switch unit 20 for real-time monitoring of the discharge state of the energy storage unit 19. When the power of the energy storage unit 19 approaches or reaches the preset over-discharge threshold, the second end of the over-discharge detection unit 22 immediately sends a signal to the control unit 14. After receiving this signal, the control unit 14 will quickly take corresponding measures, such as stopping discharging, starting the charging process or switching to the backup power supply, to prevent the energy storage unit 19 from being damaged due to over-discharge.

[0069] It can be concluded from the above that the over-discharge detection unit 22 in this embodiment effectively prevents the energy storage unit 19 from over-discharging, protects the battery life, and improves the stability and safety of the system.

[0070] In an embodiment of the present disclosure, referring to Figure 2 , a variable frequency power supply control system further includes:

[0071] A third switch unit 23 and a charging unit 24;

[0072] The first end of the charging unit 24 is connected to the first end of the rectifier 11, the second end of the charging unit 24 is connected to the first end of the third switch unit 23, the second end of the third switch unit 23 is connected to the first end of the second switch unit 20, and the control end of the third switch unit 23 is connected to the control unit 14.

[0073] In this embodiment, the main function of the charging unit 24 is to supply electrical energy to the energy storage unit 19 to ensure that the energy storage unit 19 can continuously and stably supply electrical energy. When the control unit 14 determines that the voltage detected by the voltage detection unit 18 is stable, it can control the third switch unit 23 to close, enabling the power grid to supply power to the energy storage unit 19. During the charging process, the charging unit 24 also has protection mechanisms such as overcurrent and overvoltage protection to prevent damage to the energy storage unit 19 or safety accidents caused by abnormal charging.

[0074] From the above, it can be concluded that the charging unit 24 in this embodiment can supply power to the energy storage unit 19 when the power grid is stable to ensure that when the power grid is abnormal, the energy storage unit 19 can supply power to the ship uninterruptedly.

[0075] In an embodiment of the present disclosure, referring to Figure 2 , a variable frequency power supply control system further includes:

[0076] A wireless communication unit 25;

[0077] The wireless communication unit 25 is connected to the control unit 14.

[0078] In this embodiment, the user can remotely obtain the operating status, parameter information, fault alarms, etc. of the variable frequency power supply control system through the wireless communication unit 25, thereby realizing real-time monitoring of the system, promptly discovering and solving problems. When necessary, the user can send instructions to the control unit 14 through the wireless communication unit 25 to remotely control operations such as starting, stopping, and parameter adjustment of the variable frequency power supply control system, improving the flexibility and convenience of the system.

[0079] The wireless communication unit 25 also supports the rapid transmission of a large amount of data, including system operation data, historical records, fault logs, etc. These data are of great significance for system performance analysis, fault troubleshooting, and optimization and improvement. The introduction of the wireless communication unit 25 provides the possibility for future expansion of the system. For example, it can be integrated with other intelligent devices or systems to achieve a wider range of Internet of Things applications.

[0080] In an embodiment of the present disclosure, referring to Figure 2 , a variable frequency power supply control system further includes:

[0081] A temperature detection unit 26;

[0082] The temperature detection unit 26 is connected to the control unit 14 and is used to collect the temperature of the inverter 13.

[0083] In this embodiment, the temperature detection unit 26 can detect the operating temperature of the inverter 13 in real time to ensure that the inverter 13 operates within a safe temperature range. As a key component of the variable frequency power control system, the operating temperature of the inverter 13 directly affects its performance and lifespan.

[0084] When the temperature detection unit 26 detects that the temperature of the inverter 13 is too high, it can send a signal to the control unit 14 in a timely manner. After receiving the signal, the control unit 14 can initiate corresponding protection measures, such as reducing the output power of the inverter 13, shutting down some non-critical functions, or starting the heat dissipation system, etc., to prevent damage or safety accidents caused by overheating of the inverter 13.

[0085] From the above, it can be concluded that abnormal temperature is often a precursor to faults in the inverter 13 or other components. By obtaining the data of the temperature detection unit 26, the control unit 14 can detect potential faults earlier, perform fault diagnosis and early warning, and reduce the downtime and maintenance costs caused by faults.

[0086] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the present disclosure in each embodiment.

Claims

1. A variable frequency power supply control system, characterized in that, Comprising: A rectifier, a filter, an inverter, a control unit, a voltage compensation unit, and a first switch unit; The first end of the first switch unit is used to connect to the power grid, the second end of the first switch unit is connected to the first end of the rectifier, and the control end of the first switch unit is connected to the control unit; The second end of the rectifier is connected to the first end of the filter, the second end of the filter is respectively connected to the first end of the inverter and the first end of the voltage compensation unit, the second end of the inverter is used to connect to the ship's internal network, the third end of the inverter is connected to the control unit, and the second end of the voltage compensation unit is connected to the control unit.

2. The variable-frequency power supply control system according to claim 1, characterized in that, Further comprising: A drive unit; The first end of the drive unit is connected to the third end of the inverter, and the second end of the drive unit is connected to the control unit.

3. A variable frequency power supply control system according to claim 1, characterized in that, Further comprising: A voltage detection unit, an energy storage unit, a second switch unit, and a boost unit; The first end of the voltage detection unit is connected to the second end of the rectifier, and the second end of the voltage detection unit is connected to the control unit; The first end of the second switch unit is connected to the energy storage unit, the second end of the second switch unit is connected to the boost unit, and the control end of the second switch unit is connected to the control unit; The second end of the boost unit is connected to the second end of the rectifier.

4. The variable-frequency power supply control system according to claim 3, characterized in that, Further comprising: An over-discharge detection unit; The first end of the over-discharge detection unit is connected to the first end of the second switch unit, and the second end of the over-discharge detection unit is connected to the control unit.

5. A variable-frequency power supply control system according to claim 3, characterized in that, Further comprising: A third switch unit and a charging unit; The first end of the charging unit is connected to the first end of the rectifier, the second end of the charging unit is connected to the first end of the third switch unit, the second end of the third switch unit is connected to the first end of the second switch unit, and the control end of the third switch unit is connected to the control unit.

6. A variable frequency power supply control system according to claim 1, characterized in that, Further comprising: A wireless communication unit; The wireless communication unit is connected to the control unit.

7. A variable frequency power supply control system according to claim 1, characterized in that, Further comprising: A temperature detection unit; The temperature detection unit is connected to the control unit and is used to collect the temperature of the inverter.

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