Control apparatus and control method for controlling shutdown device on basis of sine waves

Abstract

A control apparatus (4) and control method for controlling a shutdown device on the basis of sine waves. The control apparatus (4) comprises: a sine-wave generator circuit, a signal driving circuit, and a current-sensor coupling circuit, wherein the sine-wave generator circuit outputs a sine wave signal, and the sine wave signal is subjected to power amplification performed by means of the signal driving circuit, and is then transmitted to the current-sensor coupling circuit, such that each rapid shutdown device (3) is turned off or turned on.

Description

A control device and control method for controlling a circuit breaker based on a sine wave

[0001] Related applications

[0002] This application claims priority to Chinese patent application number 2023110390972, filed on August 17, 2023, entitled “A control device and control method for a circuit breaker based on sinusoidal wave control,” the entire text of which is hereby incorporated by reference. Technical Field

[0003] The present application belongs to the technical field of intelligent photovoltaic components, and specifically relates to a control device and a control method for a sine wave-based circuit breaker. Background Art

[0004] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0005] Traditional photovoltaic power generation uses multiple photovoltaic modules connected in series to form a string, which is then connected to an inverter to convert DC power into AC power before being connected to the grid. Some photovoltaic modules in the string will be blocked by other surrounding objects, causing local shadows and causing hot spots on the photovoltaic modules. When a fire occurs in the photovoltaic system, the photovoltaic DC voltage of up to thousands of volts makes firefighting and rescue difficult. Traditional photovoltaic module protection circuits use diodes in parallel with the photovoltaic modules for protection, which has a slow response speed.

[0006] At the same time, conventional module circuit breakers need to be networked with control equipment. If the module circuit breakers and control equipment are networked wirelessly, the stability of the wireless signal cannot be guaranteed. If the module circuit breakers and control equipment are networked through a separate control line, the signal transmission rate of the control line is slower than that of the power line. At the same time, the cost of the control line is also higher, and there is a certain delay in early warning, which will affect the rescue speed of abnormal accidents in the power station.

[0007] Therefore, there is an urgent need to develop a new control device and control method for a sine wave-based circuit breaker to solve the above problems.

[0008] Summary of the Invention

[0009] According to various embodiments of the present application, a control device and a control method thereof for controlling a circuit breaker based on a sine wave are provided.

[0010] The present application provides a control device for controlling a circuit breaker based on a sine wave, comprising: a sine wave generator circuit, a signal drive circuit, and a current sensor coupling circuit; wherein the current sensor coupling circuit is coupled to the power line between each fast circuit breaker and the inverter; the sine wave generator circuit outputs a sine wave signal, which is amplified by the signal drive circuit and then transmitted to the current sensor coupling circuit; the current sensor coupling circuit couples the processed sine wave signal to the power line between each fast circuit breaker and the inverter to shut down or open the corresponding fast circuit breaker.

[0011] Furthermore, the sine wave generator circuit includes: an MCU controller; the MCU controller outputs a sine wave signal.

[0012] Furthermore, the control device for controlling the breaker based on a sine wave also includes: a bandpass filter circuit; the sine wave generator circuit outputs a sine wave signal to the bandpass filter circuit, and the sine wave signal is input into the signal drive circuit after being filtered by the bandpass filter circuit.

[0013] Furthermore, the bandpass filter circuit includes: a first filter capacitor and a bandpass filter; the first filter capacitor filters out the DC component in the sinusoidal wave signal, and transmits the signal to the signal driving circuit after frequency selection by the bandpass filter.

[0014] Furthermore, the bandpass filter includes: a second capacitor, a first inductor, a second inductor, a third capacitor, a fourth capacitor and a third inductor; the sine wave signal generated by the sine wave generator circuit is filtered and frequency selected by the second capacitor, the first inductor, the second inductor, the third capacitor, the fourth capacitor and the third inductor.

[0015] Furthermore, the signal driving circuit includes: a signal driving chip; the signal driving chip amplifies the amplitude and current of the sine wave signal and transmits the amplified signal to the current sensor coupling circuit.

[0016] Furthermore, the current sensor coupling circuit includes: a current sensor; the current sensor couples and transmits a sinusoidal wave signal to the power line between each fast disconnector and the inverter.

[0017] Furthermore, each rapid shutoff is connected in series with a photovoltaic module. The present application provides a photovoltaic system comprising: a control device for controlling a shutoff based on a sine wave, as described above; a plurality of photovoltaic modules; and a plurality of rapid shutoffs; wherein each photovoltaic module is connected in series with a rapid shutoff; and the control device is coupled to the power line between each rapid shutoff and the inverter to shut down or open the corresponding rapid shutoff.

[0018] The present application provides a control method using a control device for a sine wave-based control circuit breaker as described above, comprising: coupling a current sensor coupling circuit to the power line between each fast circuit breaker and the inverter; outputting a sine wave signal through a sine wave generator circuit, and transmitting the signal to the current sensor coupling circuit after power amplification by a signal drive circuit; and coupling the processed sine wave signal by the current sensor coupling circuit to the power line between each fast circuit breaker and the inverter to shut down or open the corresponding fast circuit breaker.

[0019] Other features and advantages of the present application will be set forth in the following description and, in part, will become apparent from the description or may be understood by practicing the present application.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings.

[0021] The details of one or more embodiments of the present disclosure are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 is a diagram showing the output waveform of a square wave converted to a sine wave;

[0024] FIG2 is a circuit diagram of a control device for a sine wave controlled circuit breaker according to the present invention;

[0025] FIG3 is a circuit diagram of a control device for a sine wave controlled circuit breaker connected to a power line according to the present application;

[0026] FIG4 is an output waveform diagram of the MCU controller output TX_OUT of the present application;

[0027] FIG5 is a waveform diagram of TX_IN after the output waveform of the MCU controller of the present application is filtered by the first capacitor;

[0028] FIG6 is a waveform diagram of the output after filtering by the bandpass filter circuit of the present application;

[0029] FIG7 is an output waveform diagram of the signal driving circuit of the present application;

[0030] FIG8 is an output waveform diagram of the current sensor coupling circuit of the present application.

[0031] FIG9 is a circuit diagram of the photovoltaic system of the present application.

[0032] Explanation of the accompanying symbols: 1. Inverter; 2. Photovoltaic module; 3. Rapid shutdown device; 4. Control device; C1. First filter capacitor; C2. Second capacitor; C3. Third capacitor; C4. Fourth capacitor; L1. First inductor; L2. Second inductor; L3. Third inductor; TR1. Current sensor. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0034] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] Example 1

[0036] In this embodiment, as shown in Figures 2 to 9, this embodiment provides a control device 4 for controlling a circuit breaker based on a sine wave, which includes: a sine wave generator circuit, a signal driving circuit, and a current sensor coupling circuit connected in sequence; wherein the current sensor coupling circuit is coupled to the power line between each fast circuit breaker 3 and the inverter 1; the sine wave generator circuit outputs a sine wave signal, which is amplified by the signal driving circuit and then transmitted to the current sensor coupling circuit; the current sensor coupling circuit couples the processed sine wave signal to the power line between each fast circuit breaker 3 and the inverter 1 to turn off or turn on the corresponding fast circuit breaker 3.

[0037] In this embodiment, as shown in Figures 3 and 9, one photovoltaic module 2 and one rapid shut-off device 3 form a group, and each rapid shut-off device 3 can be individually controlled by the control device 4. At the same time, each rapid shut-off device 3 controls the on and off of the corresponding photovoltaic module 2.

[0038] In this embodiment, this embodiment can directly access the power line through the power carrier signal to achieve rapid on and off of any fast circuit breaker 3 with a fast response speed, and directly output a sinusoidal wave signal through the sine wave generator circuit, which can overcome the problem of poor sinusoidality and poor stability caused by converting square waves to quasi-sine waves, and at the same time realize signal transmission and sending by the power carrier, and control the fast circuit breaker 3 in real time and effectively, thereby achieving the purpose of protecting the photovoltaic component 2.

[0039] In this embodiment, the sine wave generator circuit includes: an MCU controller; the MCU controller outputs a sine wave signal.

[0040] In this embodiment, the output waveform of the sine wave signal output by the MCU controller is shown in FIG4 .

[0041] As shown in Figure 1, if the MCU controller directly outputs a square wave and converts the square wave into a sine wave through a subsequent circuit, the output waveform will be as shown in Figure 1, while the output waveform output by this control device 4 is as shown in Figure 8. Compared with the waveform shown in Figure 8, the waveform shown in Figure 1 has poor sinusoidality and poor stability.

[0042] In this embodiment, the MCU controller can monitor the status of the photovoltaic module 2 in real time, promptly detect problems and faults of the photovoltaic module 2, further improve the intelligence and reliability of the photovoltaic module 2, and quickly respond to abnormal situations, and quickly shut down the fast shutdown device 3 through the power carrier signal. Therefore, it is very suitable for photovoltaic power station power generation systems, and can effectively solve fires caused by hot spots, string loss of control, cable damage, etc. of the photovoltaic module 2, or quickly reduce the string voltage during maintenance, to ensure the safety of rescue or operation and maintenance personnel.

[0043] In this embodiment, the MCU controller generates a specific pattern of code, which will produce a sine wave with a specific power carrier frequency FM=131.25kHz, FS=143.75kHz, a peak-to-peak value of 1V, and a certain DC component.

[0044] In this embodiment, the control device 4 for controlling the circuit breaker based on a sine wave further includes: a bandpass filter circuit; the sine wave generator circuit outputs a sine wave signal to the bandpass filter circuit, and the sine wave signal is filtered by the bandpass filter circuit and then input into the signal drive circuit.

[0045] In this embodiment, the bandpass filter circuit includes: a first filter capacitor C1 and a bandpass filter; the first filter capacitor C1 filters out the DC component in the sine wave signal, and transmits the signal to the signal driving circuit after frequency selection by the bandpass filter.

[0046] In this embodiment, the waveform output by the MCU controller is filtered by the first filter capacitor C1 to remove the DC component, leaving an AC sine wave with a peak value of 1V.

[0047] In this embodiment, the output waveform after filtering by the first capacitor is shown in FIG5 .

[0048] In this embodiment, the bandpass filter includes: a second capacitor C2, a first inductor L1, a second inductor L2, a third capacitor C3, a fourth capacitor C4, and a third inductor L3; the sine wave signal generated by the sine wave generator circuit is filtered and frequency-selected by the second capacitor C2, the first inductor L1, the second inductor L2, the third capacitor C3, the fourth capacitor C4, and the third inductor L3.

[0049] In this embodiment, the output waveform after passing through the bandpass filter is shown in FIG6 , and the parameter selection of the bandpass filter meets the frequency selection function requirement of the bandpass signal.

[0050] In this embodiment, the signal driving circuit includes: a signal driving chip; the signal driving chip amplifies the amplitude and current of the sine wave signal and transmits the amplified signal to the current sensor coupling circuit.

[0051] In this embodiment, the output waveform output by the signal driving circuit is shown in FIG7 .

[0052] In this embodiment, the signal driver chip acts as a sine wave driver, and the signal driver circuit is also provided with a signal protection circuit, which can amplify the power of the sine waveform, that is, amplify the current and voltage amplitude. The driving capability of the signal driver chip depends on the signal load requirement capability of the subsequent stage.

[0053] In this embodiment, the current sensor coupling circuit includes: a current sensor TR1 ; the current sensor TR1 couples and transmits a sinusoidal wave signal to the power line between each fast disconnector 3 and the inverter 1 .

[0054] In this embodiment, the output waveform output by the current sensor coupling circuit is shown in FIG8 .

[0055] In this embodiment, the current sensor TR1 can couple the sinusoidal wave signal to the fast shut-off device 3, thereby controlling the opening and closing of the fast shut-off device 3. By implementing signal transmission in the form of a power carrier through the current sensor TR1, the installation cost of the photovoltaic module 2 can be reduced, and it is also convenient for subsequent maintenance personnel.

[0056] In this embodiment, each rapid shutdown device 3 is connected in series with a photovoltaic module 2 .

[0057] How it works

[0058] The MCU controller outputs a sinusoidal wave signal, which is filtered by a bandpass filter circuit and then amplified by a signal drive circuit. The amplified sinusoidal wave signal is then coupled to the fast shut-off device 3 via a current sensor coupling circuit. The fast on / off of any photovoltaic module 2 is achieved through power carrier wireless communication, saving material costs and labor maintenance costs. Compared with traditional module protection devices, the device has a faster shutdown and a better protection effect.

[0059] Example 2

[0060] Based on Example 1, as shown in Figures 2 to 11, this embodiment provides a photovoltaic system, which includes: a control device 4 as provided in Example 1, a plurality of photovoltaic modules 2 and a plurality of rapid shut-off devices 3; wherein each of the photovoltaic modules 2 is connected in series with a rapid shut-off device 3, and the control device 4 is coupled to the power line between each rapid shut-off device 3 and the inverter 1 to shut down or open the corresponding rapid shut-off device 3.

[0061] In this embodiment, one photovoltaic assembly 2 and one rapid shutoff device 3 form a group, and each rapid shutoff device 3 can be controlled individually by the control device 4 . At the same time, each rapid shutoff device 3 controls the on and off of the corresponding photovoltaic assembly 2 .

[0062] Example 3

[0063] Based on the above embodiments, this embodiment provides a control method using a control device 4 for controlling a sine wave-based circuit breaker as provided in Example 1, comprising: coupling a current sensor coupling circuit to the power line between each fast circuit breaker 3 and the inverter 1; outputting a sine wave signal through a sine wave generator circuit, and transmitting the signal to the current sensor coupling circuit after power amplification by a signal driving circuit; and coupling the processed sine wave signal by the current sensor coupling circuit to the power line between each fast circuit breaker 3 and the inverter 1 to shut down or open the corresponding fast circuit breaker 3.

[0064] To sum up, the present application can directly access the power line through the power carrier signal, realize the rapid switching on and off of any fast circuit breaker, and has a fast response speed. It can also directly output a sinusoidal wave signal through the sine wave generator circuit, which can overcome the problems of poor sinusoidality and stability caused by converting square waves to quasi-sine waves, and effectively control the fast circuit breaker in real time, thereby achieving the purpose of protecting smart photovoltaic components.

[0065] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0066] In the description of the embodiments of this application, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0067] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0068] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. There may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed may be through some communication interface, indirect coupling or communication connection of devices or units, which may be electrical, mechanical or other forms.

[0069] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0070] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0071] Based on the above-described ideal embodiments of this application, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

[0072] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A control device for controlling a circuit breaker based on a sine wave, comprising: Sine wave generator circuit, signal driving circuit and current sensor coupling circuit; The current sensor coupling circuit is coupled to the power line between each fast shut-off device and the inverter; The sine wave generator circuit outputs a sine wave signal, which is transmitted to the current sensor coupling circuit after power amplification by the signal driving circuit. The current sensor coupling circuit couples the processed sine wave signal to the power line between each fast switch and the inverter to turn off or turn on the corresponding fast switch.

2. The control device for controlling a circuit breaker based on a sine wave as claimed in claim 1, wherein The sine wave generator circuit comprises: MCU controller; The MCU controller outputs a sine wave signal.

3. The control device for a sine wave controlled circuit breaker as claimed in claim 2, wherein the MCU controller is capable of monitoring the status of the photovoltaic assembly in real time.

4. The control device for controlling a breaker based on a sine wave as claimed in claim 1, further comprising: Bandpass filter circuit; The sine wave generator circuit outputs a sine wave signal to the bandpass filter circuit, and the sine wave signal is input into the signal driving circuit after being filtered by the bandpass filter circuit.

5. The control device for controlling a circuit breaker based on a sine wave as claimed in claim 4, wherein The bandpass filter circuit comprises: A first filter capacitor and a bandpass filter; The first filter capacitor filters out the DC component in the sinusoidal wave signal, and transmits the signal to the signal driving circuit after being frequency selected by the bandpass filter.

6. The control device for controlling a circuit breaker based on a sine wave as claimed in claim 5, wherein The bandpass filter comprises: a second capacitor, a first inductor, a second inductor, a third capacitor, a fourth capacitor, and a third inductor; The sine wave signal generated by the sine wave generator circuit is filtered and frequency selected by the second capacitor, the first inductor, the second inductor, the third capacitor, the fourth capacitor, and the third inductor.

7. The control device for controlling a circuit breaker based on a sine wave as claimed in claim 1, wherein The signal driving circuit comprises: Signal driver chip; The signal driving chip amplifies the amplitude and current of the sine wave signal and transmits the amplified signal to the current sensor coupling circuit.

8. A control device for a sine wave controlled circuit breaker as described in claim 7, wherein the signal driving chip serves as a sine wave driver, and the signal driving circuit is also provided with a signal protection circuit capable of amplifying the power of the sine wave, and the driving capability of the signal driving chip depends on the signal load demand capability of the subsequent stage.

9. The control device for controlling a circuit breaker based on a sine wave as claimed in claim 1, wherein The current sensor coupling circuit comprises: Current sensor; The current sensor couples and transmits a sinusoidal wave signal into a power line between each fast disconnector and the inverter.

10. The control device for controlling a circuit breaker based on a sine wave as claimed in claim 1, wherein Each rapid shutdown device is connected in series with a PV module.

11. The control device for controlling a breaker based on a sine wave as claimed in claim 1, wherein one photovoltaic module and one fast switch form a group, each fast switch can be controlled by the control device individually, and each fast switch controls the on and off of the photovoltaic module corresponding to it.

12. A photovoltaic system comprising: A control device for a sine wave controlled circuit breaker, a plurality of photovoltaic modules and a plurality of fast circuit breakers as claimed in any one of claims 1 to 11; wherein Each of the photovoltaic components is connected in series with a fast disconnector, and the control device is coupled to the power line between each fast disconnector and the inverter to disconnect or open the corresponding fast disconnector.

13. The photovoltaic system as claimed in claim 12, wherein one photovoltaic component and one rapid switch form a group, each rapid switch can be controlled by the control device individually, and each rapid switch controls the on and off of the photovoltaic component corresponding to it.

14. A control method using the control device for controlling a circuit breaker based on a sine wave as claimed in any one of claims 1 to 10, comprising: The current sensor coupling circuit is coupled to the power line between each fast shut-off device and the inverter; The sine wave signal is outputted through the sine wave generator circuit, and is transmitted to the current sensor coupling circuit after power amplification by the signal driving circuit; The processed sinusoidal wave signal is coupled to the power line between each fast disconnector and the inverter by the current sensor coupling circuit to turn off or turn on the corresponding fast disconnector.

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