CN115764817A - Quick shutoff device supporting two-way photovoltaic module input and having monitoring function - Google Patents
Quick shutoff device supporting two-way photovoltaic module input and having monitoring function Download PDFInfo
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Abstract
The invention relates to the technical field of photovoltaic power generation and communication, in particular to a quick shutoff device which supports two paths of photovoltaic module inputs and has a monitoring function. It includes: the input ports are respectively connected with the positive electrode output and the negative electrode output of the first photovoltaic assembly and the second photovoltaic assembly; 2 groups of MOS switches are respectively arranged on the cathode circuits of the first photovoltaic component and the second photovoltaic component, wherein the cathode of the first photovoltaic component is connected with the anode of the second photovoltaic component through the MOS switches; the logic control unit is used for controlling the on and off of the switch unit; and the power supply unit converts high-voltage input into low-voltage output and supplies power to the logic control unit. The function of 2 related products can be realized by adopting 1 quick turn-off device supporting two-way input, and only one processing chip, peripheral electronic materials, a PCB (printed circuit board) and the like are needed, so that the cost of raw materials is greatly reduced.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation and communication, in particular to a quick shutoff device which supports two paths of photovoltaic module inputs and has a monitoring function.
Background
Due to the renewable and clean nature of solar energy, photovoltaic grid-connected power generation technology is rapidly developed. At present, a plurality of photovoltaic modules are connected in series to form a photovoltaic group string, and the photovoltaic group string is converted into alternating current by an inverter and then is transmitted to a power grid. The direct-current voltage formed by the photovoltaic module arrays connected in series is very high, and great potential safety hazards exist, in order to improve the safety of a photovoltaic system, the photovoltaic modules are required to be quickly turned off by themselves when abnormal states occur, and the working stability of the whole string group is prevented from being influenced. In the prior art, a cut-off device is connected behind each photovoltaic module, and the power output of each photovoltaic module is controlled by the cut-off device, so that the voltage on a direct current cable can meet the safety requirements.
Chinese patent CN201910711960 discloses a photovoltaic module breaker, wherein a plurality of switching tubes connected in series receive a communication signal sent by a controller in the breaker to perform related on and off operations, and the series-parallel connection of the switching tubes is utilized to reduce failure rate of the breaker, thereby improving stability and reliability. In addition, the prior art device shutdown generally supports only one input, for example, as shown in fig. 1, such a shutdown device includes a processor, a switch unit, a switch, a bypass diode, and the like. After the voltage of the photovoltaic component is input, sending an instruction to the switch unit through logic control so as to open the switch MOS and output the voltage to the rear-stage component; and the bypass diode D is used for conducting when the component breaker breaks down, bypassing the single component breaker, and generating current from the bypass diode D for later-stage use so as not to influence the normal work of other components in the whole string.
However, such a component shutdown only supports the input of one component, and each component in a system adopting such shutdown needs to be equipped with at least one shutdown for monitoring, thereby greatly increasing the installation cost of the whole set of system of photovoltaic components. Secondly, when the number of the breaker installed in the photovoltaic module system is large, due to the fact that carrier coupling is carried out through the power line, clutter signals on the power line interfere much, signal strength can be weakened when the transmission distance is long, carrier communication is affected, therefore communication quality is reduced, and normal turn-off of the module is affected.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a quick breaker supporting two-path photovoltaic module input and having a monitoring function, which comprises the following components:
the input ports are respectively connected with the positive electrode output and the negative electrode output of the first photovoltaic assembly and the second photovoltaic assembly;
the switch unit at least comprises 2 groups of MOS switches which are respectively arranged on the negative pole circuits of the first photovoltaic component and the second photovoltaic component, wherein the negative pole of the first photovoltaic component is connected with the positive pole of the second photovoltaic component through 1 group of MOS switches;
the logic control unit is used for controlling the on and off of the switch unit;
and the power supply unit converts high-voltage input into low-voltage output and supplies power to the logic control unit.
As a preferred technical solution of the present invention, the fast turn-off device supporting two photovoltaic module inputs and having a monitoring function further includes voltage sampling units respectively disposed between the positive output and the negative output of the photovoltaic module; and the voltage sampling unit is in communication connection with the logic control unit.
As a preferred technical solution of the present invention, the voltage sampling unit samples the output voltage of the photovoltaic module after receiving the sampling instruction of the logic control unit.
As a preferred technical solution of the present invention, an inductor is disposed on the negative line of the second photovoltaic module, and one end of the inductor is connected to the negative output of the second photovoltaic module through a set of MOS switches.
As a preferred technical solution of the present invention, the logic control unit is in communication connection with the inductive carrier; further, the logic control unit receives a carrier signal between the positive electrode and the negative electrode of the inductance differential circuit.
As a preferred technical solution of the present invention, a current sampling unit is disposed on a negative output line of the second photovoltaic module, and the current sampling unit is in communication connection with the logic control unit; further, the current sampling unit samples the current flowing through the second photovoltaic module after receiving the sampling instruction of the logic control unit.
As a preferred technical solution of the present invention, a bypass diode and a capacitor are respectively disposed between the positive output and the negative output of the first photovoltaic module and the second photovoltaic module; the anode of the bypass diode is connected with the first photovoltaic assembly or the second photovoltaic assembly through a group of MOS switches, and the cathode of the bypass diode is connected with the anode output of the first photovoltaic assembly or the second photovoltaic assembly.
As a preferred technical solution of the present invention, the logic control unit controls the on/off of the switch unit through a fast switch unit; preferably, the fast switch unit at least comprises 1 MOS switch, the G pole of the MOS switch is connected to the GPIO interface of the logic control unit, the S pole is grounded, and the D pole is connected to G of another MOS switch through a voltage dividing resistor.
As a preferred technical solution of the present invention, the power supply unit converts a high voltage input into a low voltage output, and supplies power to the fast switching unit.
The second aspect of the invention provides a photovoltaic power generation system, which comprises the rapid breaker supporting two paths of photovoltaic module inputs and having a monitoring function, and also comprises a plurality of photovoltaic modules; four input ports of the quick breaker are respectively connected with the positive output and the negative output of the two photovoltaic modules; at least one of the output ports of the rapid shutoff devices is connected with the output ports of other rapid shutoff devices in series to form a photovoltaic string; a plurality of photovoltaic groups are connected in series and parallel to form a photovoltaic array; and the photovoltaic array is connected with a rear-stage photovoltaic module to form the photovoltaic power generation system.
Compared with the prior related scheme, the technical scheme provided by the invention has the following beneficial effects:
firstly, the rapid cut-off device provided by the invention supports two-way input, and compared with a product or technology which only supports one-way component input in the prior art, the operation cost of a photovoltaic power generation system is greatly reduced by adopting two-way input through one cut-off device product. In addition, the function of fast turn-off which can be realized only by 2 single-path components originally can be realized by adopting 1 fast turn-off device supporting two-path input, and only one logic processing chip is needed, so that the cost of peripheral electronic materials, a PCB (printed circuit board), a shell and other raw materials is greatly reduced, and the installation and operation cost of the whole photovoltaic system is further obviously reduced. Meanwhile, each photovoltaic module is required to be equipped with at least one shut-off device in the traditional photovoltaic system, when the number of the shut-off devices in the system is large, carrier communication transmission errors among the shut-off devices are increased, communication quality is reduced, control performance of each shut-off device is reduced, and stable operation of the photovoltaic system is affected. By adopting the rapid shutoff device, the using amount of the rapid shutoff device in the photovoltaic system is effectively reduced, and the problem of reduction of communication quality is effectively avoided, so that the operation stability of the photovoltaic system is remarkably improved.
Secondly, the rapid breaker provided by the invention directly connects two photovoltaic modules with the rapid breaker, and the single input voltage of the photovoltaic modules is output in series through internal processing after passing through the rapid breaker, rather than connecting the two photovoltaic modules in series and inputting the superposed voltage into the rapid breaker. The voltage of two paths of components is input singly, and then the voltage of one path of components is transmitted to a power supply to be subjected to voltage conversion before voltage superposition, so that voltages with different sizes are provided for a logic control unit, a quick switching unit and the like in the breaker, the input voltage of the power supply is ensured to be in a specific range, and a small fluctuation range is kept, and therefore the situation that the power supply unit is broken by high voltage or unstable power supply and the like is avoided, and the performance of the breaker is influenced.
In addition, the MOS switch arranged on the power output circuit of the photovoltaic module is controlled through the quick switch unit, the high and low levels provided by the logic control unit are skillfully inverted for multiple times while the small current loss is ensured through skillful design of a circuit of the quick switch unit and design and resistance optimization of a divider resistor circuit in the quick switch unit, so that the stable conduction and cut-off of the MOS switch are ensured, and the MOS switch arranged on the negative electrode circuit of the photovoltaic module is conducted when the GPIO interface of the logic control unit outputs the high level, so that the power of the module is output to a rear-stage module; when the GPIO interface of the logic control unit outputs low level, the MOS switch arranged on the negative electrode circuit of the photovoltaic module is cut off to block power output.
In addition, the specific voltage detection and current detection circuit is arranged in the quick turn-off device, so that the current operation state, voltage and current operation parameters of the photovoltaic module can be effectively controlled, the operation of the whole system can be effectively monitored, the risk of the system is reduced, and safety guarantee is provided. And the detection circuit is further optimized, so that the voltage at two output ends of the component and the current flowing through the two paths of components are monitored during verification, the progress can be further adjusted, and the monitoring accuracy is improved. In addition, the output end of the quick cut-off device is additionally provided with the coupling capacitor, so that the signal loss is less through the capacitance signal coupling in the transmission process of the carrier signal, the situation that the signal strength is too low when the cut-off device is too far away in the system is avoided, and the quality of carrier communication is guaranteed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of a prior art shutdown device and a photovoltaic system including the same.
Fig. 2 is a schematic diagram of a circuit framework of a fast breaker supporting two photovoltaic module inputs and having a monitoring function according to the present invention.
Fig. 3 is a schematic diagram of a circuit framework for implementing the voltage monitoring unit in the fast turn-off device according to the present invention.
Fig. 4 is a schematic diagram of a circuit framework for implementing the current monitoring unit in the fast turn-off device according to the present invention.
Fig. 5 is a schematic diagram of a circuit framework of a fast breaker supporting two photovoltaic module inputs and having a monitoring function according to the present invention.
Fig. 6 is a schematic diagram of a circuit framework of a fast breaker supporting two photovoltaic module inputs and having a monitoring function according to the present invention.
Fig. 7 is a schematic control flow diagram of a fast turn-off device supporting two photovoltaic module inputs and having a monitoring function according to the present invention.
Fig. 8 is a schematic diagram of a photovoltaic system including a fast shutoff device supporting two photovoltaic module inputs and having a monitoring function according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
In the following description, the terms "first" and "second" are used for descriptive purposes only and are not intended to indicate or imply relative importance. The following description provides examples, and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements described without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different than the order described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined into other examples.
In the photovoltaic system in the prior art, in order to ensure that the voltage of a photovoltaic module (including but not limited to a photovoltaic panel, a photovoltaic cell, etc.) which will cause a problem during operation is reduced below a safe voltage, and to avoid a safety risk, a shutdown device is often required to be equipped for each photovoltaic module to perform on and off operations. For example, referring to fig. 1, a shutdown device is connected to an output end of each photovoltaic module, and generally the shutdown device includes a logic control unit and a switch (e.g., a MOS switch), and the logic control unit controls on and off of the switch disposed on an output line of the photovoltaic module, so as to achieve the effects of outputting and blocking power output of the photovoltaic module. However, the general breaker only supports the input of one path of photovoltaic module (i.e. the positive and negative inputs of one photovoltaic module), when there are many photovoltaic modules in the photovoltaic system, the number of corresponding breakers is also large, and because carrier communication is generally performed between the breakers and logic control to perform interaction of related data, when there are many breakers, the layout distance therebetween inevitably becomes long, so that the carrier communication therebetween is interfered, and a corresponding communication signal cannot be completely transmitted to a target object, thereby causing unstable operation of the system. Moreover, when each photovoltaic module is provided with a single shutoff device, a large amount of raw materials such as peripheral electronic materials, circuit boards and structural materials are necessarily needed, the cost of the raw materials is increased, and each quick shutoff device needs to be processed and manufactured, so that the production and installation cost of the whole photovoltaic system is greatly increased. Therefore, the traditional breaker product needs to be optimized in the aspects of intellectualization and integration, so that various performances are improved, more comprehensive functions are provided, and the cost of installation, operation, maintenance and the like of the system is further reduced.
Next, a fast breaker supporting two photovoltaic module inputs and having a monitoring function and a photovoltaic power generation system including the same, which are provided by the present application, will be described in detail.
Referring to fig. 2 and 8, the present invention provides a fast turn-off device with monitoring function for supporting two photovoltaic module inputs, which includes:
the photovoltaic module comprises four input ports and two output ports, wherein the input ports are respectively connected with the positive electrode output and the negative electrode output of the first photovoltaic module and the second photovoltaic module. The positive and negative outputs of the photovoltaic module, namely the positive and negative inputs of the quick breaker, are referred in the invention, so that the inputs of the photovoltaic module, which may be referred in the application document, may refer to the inputs of the quick breaker, and those skilled in the art can clearly obtain related information by combining with the drawings of the detailed description. The quick cut-off device supports the input of two photovoltaic modules, namely, the quick cut-off device is provided with an interface for connecting the positive output and the negative output of 2 photovoltaic modules. The photovoltaic modules are individually and directly connected to the quick breaker and then output after being connected in series in the quick breaker, namely the input voltage of the quick breaker is the output voltage of a single photovoltaic module, and the output voltage of the quick breaker is the superposition of the voltages of two photovoltaic modules after being connected in series.
And the switch unit at least comprises 2 groups of MOS switches which are respectively arranged on the negative pole circuits of the first photovoltaic component and the second photovoltaic component, wherein the negative pole of the first photovoltaic component is connected with the positive pole of the second photovoltaic component through 1 group of MOS switches. The switch unit is used for outputting the power of the photovoltaic module to a rear-stage module or switching off the power of the photovoltaic module to prevent the power output, so that the effect of safely controlling the photovoltaic module is achieved. According to the on condition of the MOS switch (Vg-Vs > 2V), if the MOS switch is kept on, the G pole voltage of the MOS switch is required to be higher than the S pole all the time, therefore, when the MOS switch is arranged on the anode input line, the S pole of the NMOS switch is connected with the photovoltaic module, and in order to enable the G pole voltage of the NMOS switch to be higher than the S pole voltage, a voltage conversion circuit is required to be additionally added, and the G pole voltage of the MOS switch is higher than the S pole. In the operation process of the photovoltaic system, the MOS switches are generally in a conducting state, the power of the photovoltaic module is transmitted to the rear-stage module, and the photovoltaic module is cut off only when the photovoltaic module operates abnormally, namely the S pole and the G pole of the MOS switches are continuously in a high-voltage state, so that serious loss is brought to the MOS switches, the service life is seriously shortened, and the stability of the photovoltaic system is also greatly reduced. According to the photovoltaic system, the MOS switch is arranged on the negative pole circuit of the photovoltaic component, at the moment, the S pole of the MOS switch is connected with the negative pole output of the photovoltaic component, namely, the MOS switch is in a grounding low-voltage state, so that the MOS switch can be ensured to be conducted as long as a voltage higher than 2V is input to the G pole of the MOS switch, the MOS switch is in a relatively low voltage state in the operation process of the photovoltaic system, the loss of the MOS switch is effectively reduced, and the operation stability of the photovoltaic system is correspondingly improved.
The logic control unit is used for controlling the on and off of the switch unit; the logic control unit in the invention is also called a processor, wherein a built-in control chip is mainly used for receiving external instructions and information, sending sampling instructions to a monitoring unit on a shutoff device based on the external instructions and programs on the built-in chip, receiving data collected by the monitoring unit and sending the data to an external (remote) control unit such as an upper computer. In addition, a threshold value is set in the logic control unit, and when the data acquired by the monitoring unit exceeds the threshold value range, the MOS switch unit on the component circuit can be directly controlled to switch off the component.
And the power supply unit converts high-voltage input into low-voltage output and supplies power to the logic control unit. The logic control unit arranged in the quick cut-off device can be supplied with power by the photovoltaic module connected with the logic control unit, and can also be supplied with power by an external power supply. When an external power supply is used for supplying power, the power supply unit can be a battery or the like which continuously supplies voltage and current. When the photovoltaic component is used for supplying power, the power supply unit can be a converter or a conversion circuit which converts the high voltage of the photovoltaic component into the voltage capable of driving the logic control unit to work.
In some preferred embodiments of the present invention, the fast turn-off device supporting two photovoltaic module inputs and having a monitoring function further includes a voltage sampling unit (i.e. a voltage monitoring unit) respectively disposed between the positive output and the negative output of the photovoltaic module; the voltage sampling unit is in communication connection with the logic control unit; further, the voltage sampling unit samples the output voltage of the photovoltaic module after receiving the sampling instruction of the logic control unit.
Because the photovoltaic system converts the irradiated light energy into electric energy through the photovoltaic module for transmission, the voltage of the photovoltaic module is related to the environmental factors such as the illumination intensity, when the illumination intensity changes, or due to the changes of dust accumulation, shadows and the like on the surface of the module, the output voltage of the photovoltaic module changes, which directly affects the power generation efficiency of the system, and therefore the voltage change condition of each module needs to be known in real time.
In the invention, the sampling circuit in the voltage sampling unit is not particularly limited, as long as the voltage difference between the positive output and the negative output of the photovoltaic module can be measured. In some embodiments, the voltage sampling unit includes a pull-up resistor and a pull-down resistor, and a high level output by the positive electrode of the photovoltaic module is divided by the pull-up resistor and the pull-down resistor and then connected to the logic control unit (where a metering chip is disposed, or a single metering chip may be disposed, and then data measured by the metering chip is transmitted to the logic control unit). One end of the pull-up resistor is connected with the output of the component, and the other end of the pull-up resistor is connected with an ADC1 functional pin of the metering chip; one end of the pull-down resistor is connected with an ADC1 functional pin of the metering chip, and the other end of the pull-down resistor is grounded.
In some preferred embodiments of the present invention, referring to fig. 3, the voltage sampling unit includes a positive voltage-dividing resistance line and a negative voltage-dividing resistance line, and positive and negative outputs of the photovoltaic module are respectively connected to positive and negative ADC1 function pins of the metering chip after passing through the resistance lines, and are transmitted to the logic control unit for processing after being metered by the metering chip. Furthermore, the positive voltage dividing resistor circuit comprises a pull-up resistor R11 and a pull-down resistor R4, one end of the pull-up resistor R11 is connected with the positive output of the photovoltaic module, and the other end of the pull-up resistor R11 is connected with a positive ADC1 functional pin of the metering chip; one end of the pull-down resistor R4 is connected with one end of the pull-down resistor R11 and then is connected to the positive pole ADC1 functional pin of the metering chip, and the other end of the pull-down resistor R4 is grounded. Furthermore, the negative voltage dividing resistor circuit comprises a resistor R5, one end of the resistor R5 is grounded, and the other end of the resistor R is connected to the negative ADC1 function pin of the metering chip.
In some preferred embodiments, the positive voltage-dividing resistance line and the negative voltage-dividing resistance line are provided with filter capacitors C31 and C32, so that voltage fluctuation of the positive output of the photovoltaic module and voltage fluctuation of the negative output of the photovoltaic module generated when the negative voltage is grounded are reduced, and the accuracy of voltage measurement is further improved. In the invention, the resistance values of the pull-up resistor R11 and the pull-down resistor R4 can be set according to the output voltage range of the photovoltaic module and the requirement of a voltage dividing resistor network.
In some embodiments, the pull-up resistor R11 and the pull-down resistor R4 have values of 300K and 2 to 3K, respectively. In order to further reduce the voltage sampling deviation, a high-precision pull-up resistor and a pull-down resistor are preferably used in the present invention. Further preferably, the pull-up resistor R11 is composed of a plurality of resistors connected in series (for example, referring to fig. 3, the pull-up resistor R11 is composed of three resistors R1, R2, and R3 connected in series and having a resistance of 100K), and further, the resistors having the same resistance may be selected to be connected in series to form the pull-up resistor R11, and the sum of the resistances of the plurality of resistors connected in series is the same as the total resistance of the pull-up resistor R11. The pull-up resistor formed by serially connecting resistors with small resistance values can help to improve sampling precision and reduce sampling errors.
In some preferred embodiments of the present invention, the quick turn-off device supporting two photovoltaic module inputs and having a monitoring function further includes a current sampling unit (i.e., a current monitoring unit) disposed on the negative output line of the second photovoltaic module. According to the invention, after the two photovoltaic modules are connected into the quick cut-off device, the two photovoltaic modules are connected in series through the internal circuit and then output, and according to the current rule of the series circuit, when the currents output by the first photovoltaic module and the second photovoltaic module are different, the currents after being connected in series can be automatically averaged, so that the current flowing through the system after being connected in series can be detected. Similarly, because the output power of the photovoltaic module changes due to the change of external factors, the current monitoring unit in the application is mainly used for judging whether the current in the system fluctuates or exceeds the bearing range of the module, and the stability of the rear-stage power supply is guaranteed.
In some embodiments, the current sampling unit includes a positive sampling resistor and a negative sampling resistor, and the current flowing through the positive and negative sampling resistors is collected and transmitted to the metering chip for metering, so as to obtain the current value flowing through the system, and the current value is used for performing all-around monitoring on the system.
Referring to fig. 4, in some embodiments, one end of the positive sampling resistor R41 and one end of the negative sampling resistor R42 are respectively connected to one end of a filter capacitor C41 and one end of a filter capacitor C42, and then are respectively connected to positive and negative ADC2 function pins of the metering chip, and the other end of the filter capacitor C41 and the other end of the filter capacitor C42 are respectively grounded. Further, the resistance values of the positive electrode sampling resistor R41 and the negative electrode sampling resistor R42 are the same.
The current sampling unit is controlled by the logic control unit, wherein the current sampling unit is in communication connection with the logic control unit; further, the current sampling unit samples the current flowing through the second photovoltaic module after receiving the sampling instruction of the logic control unit. In the present invention, the communication mode between the current sampling unit and the logic control unit is not particularly limited, and wired communication (for example, carrier communication) or wireless communication (for example, wiFi or the like) may be adopted
The logic control unit (namely, the processor) is a core component of the quick shutoff device, a processing chip is arranged in the logic control unit, and a corresponding processing program is arranged in the logic control unit. The logic control unit is mainly used for sending instructions to the voltage sampling unit and the current sampling unit to collect parameters such as voltage and current of the photovoltaic assembly, receiving collected data at the same time, and then transmitting the data to a post-processing platform such as an upper computer in a wired or wireless mode.
In some embodiments, the logic control unit may receive an external instruction, and turn on and off a switch unit disposed on a negative line of the photovoltaic module according to the instruction requirement, so that when an unsafe accident such as a fire or an electric arc occurs, or when the photovoltaic system is maintained, the logic control unit may block power output of the photovoltaic module, and the voltage of the system drops below a safe voltage. In some embodiments, the logic control unit sets a threshold for parameters such as system current and component voltage, specific parameters may be stored in a built-in chip in the logic control unit, and when the parameters such as component current and component voltage exceed the threshold range, the logic control unit may also turn off the switch unit by itself.
In some embodiments, the output voltage threshold of the photovoltaic module is 8 to 80V; and when the output voltage of the single photovoltaic module is higher than the threshold range or lower than the threshold range, the logic control unit turns off the corresponding photovoltaic module, and the normal power output of the module is kept only when the output voltage of the module is within the threshold range of 8-80V. Further, the output current threshold of the photovoltaic module is 0-20A; and when the output current of the photovoltaic assembly is higher than the threshold range or lower than the threshold range, the logic control unit turns off the corresponding photovoltaic assembly, and the power of the assembly is normally output only when the output current of the assembly is within the threshold range of 0 to 20A.
Referring to fig. 7, the logic control unit (i.e., the processor) periodically sends a data acquisition command to the voltage sampling unit and the current sampling unit (which may be sent simultaneously or sequentially), the voltage sampling unit and the current sampling unit respectively sample the voltage and the current of the component, and transmit the sampled data to the logic control unit, where the data transmission mode is not particularly limited, and may be transmitted wirelessly or by wire, for example, by carrier communication. The logic control unit receives the collected voltage data and current data, compares the voltage data and the current data with a built-in voltage/current threshold value respectively, judges whether the collected voltage data and the collected current data exceed the threshold value range, keeps the normal power output of the assembly when the voltage data and the current data exceed the threshold value range, and turns off a switch unit (such as an MOS switch) corresponding to the assembly as long as any one of the voltage data and the current data exceeds the threshold value range to block the power output of the corresponding photovoltaic assembly. When data transmission is performed in a carrier communication mode, the logic control unit is internally provided with a modulation and demodulation related program, the specific demodulation mode and related algorithm are not particularly limited, and various modes known to those skilled in the art can be adopted to receive communication data and perform demodulation and reading.
In some preferred embodiments of the present invention, a bypass diode D1 and a bypass diode D2 are respectively disposed between the positive output and the negative output of the first photovoltaic module and the second photovoltaic module; the anode of a diode D1 arranged between the anode and the cathode of the first photovoltaic component is connected with the first photovoltaic component through a group of MOS switches, and the cathode of the diode D1 is connected with the anode output of the first photovoltaic component; the negative pole of a bypass diode D2 arranged between the positive pole and the negative pole of the second photovoltaic assembly is connected with the positive pole output of the second photovoltaic assembly, and the negative pole is connected to the negative pole output of the quick breaker through an inductor.
The bypass diode D1 and the bypass diode D2 are used for conducting when the input of the photovoltaic module fails, the single module is bypassed, and the follow current power supply is provided for the rear-stage output through the bypass diode D1 and the bypass diode D2, so that the whole system is not influenced by the failure of a single shutoff device to supply power integrally. Referring to fig. 2, in the circuit, when a first photovoltaic module is abnormal, the MOS switch (N1) is turned off by the protected logic control unit, and at this time, the power supply of the second photovoltaic module flows to the output OUT + through the bypass diode D1, and the output voltage of the whole module is equal to the input voltage of the second photovoltaic module, similarly, when the input of the second photovoltaic module is abnormal, the MOS switch (N2) is turned off by the protected logic control unit, and at this time, the power supply of the first photovoltaic module flows to the output OUT + through the bypass diode D2, and the output voltage of the whole module is equal to the input voltage of the first photovoltaic module.
In some preferred embodiments of the invention, the switching units are arranged on the negative supply lines (VIN-and VOUT-) of the first/second photovoltaic modules. Because the switch unit generally adopts the MOS switch, when the two MOS switches are switched on, a voltage difference needs to exist between the G pole and the S pole, and normally Vg-Vs is switched on when being more than 2V, otherwise, the two MOS switches are switched off. Because the anode of the photovoltaic module is generally in a high-voltage state, if the MOS switch is arranged at the anode input and anode output positions of the photovoltaic module, the G pole of the photovoltaic module needs to be additionally boosted, and it is ensured that the Vg-Vs differential pressure is not less than 2V, so that the MOS switch is always in a higher voltage and current state, and the failure probability of the MOS switch is remarkably improved. And the negative pole circuit of the photovoltaic module is generally in a low-voltage state, so that the failure probability of the MOS switch is effectively reduced by arranging the switch unit on the negative pole circuit (VIN-and VOUT-) of the first photovoltaic module/the second photovoltaic module, and the service life of the product is prolonged.
In some preferred embodiments of the present invention, decoupling capacitors C1 and C3 are respectively disposed between the positive output (i.e., the positive input of the fast interrupter) and the negative output (i.e., the negative input of the fast interrupter) of the first photovoltaic module and the second photovoltaic module, and the decoupling capacitors help to prevent current fluctuations generated in the power supply circuit from affecting the normal operation of the circuit when the input current changes instantaneously, and can also solve interference caused by power supply noise.
In some preferred embodiments, carrier signal coupling capacitors C2 and C4 are arranged between the positive electrode and the negative electrode of the output end after the first photovoltaic module and the second photovoltaic module are connected in series inside the fast breaker. Through set up carrier signal coupling electric capacity C2 and C4 at the output, although carrier signal is through power line transmission, itself exists clutter and interference of self on the power line, lead to the signal can weaken in the transmission course, the coupling electric capacity through the output this moment, can pass through this capacitive coupling to the carrier signal that previous stage transmission was come, the quick ware that closes of next stage is retransmitted after the reinforcing signal again, through the coupling of this kind of continuous one-level, transmit carrier signal for last quick ware that closes, make every quick ware that closes in the group string can both receive stronger carrier signal, thereby can effectual control the normal operating of closing the ware.
In some preferred embodiments of the present invention, an inductor is disposed on the negative line of the second photovoltaic module, and one end of the inductor is connected to the negative output of the second photovoltaic module through a set of MOS switches. The voltage and current thresholds of the fast turn-off device in the invention have wide range, and the output voltage and current of the photovoltaic module are determined based on the current and voltage requirements of the later module in the photovoltaic power generation system. When the current demand of the rear-stage assembly is increased instantly, the power supply is unstable due to sudden change of the current provided by the photovoltaic assembly through the quick cut-off device, and the current flowing through the inductor cannot be suddenly changed due to the characteristics of the inductor, so that the stability of the power supply of the whole system is well protected.
In some preferred embodiments, the logic control unit is connected in communication with the inductive carrier; further, the logic control unit receives a carrier signal between the positive electrode and the negative electrode of the inductance differential circuit. The positive electrode of the photovoltaic module is generally in a high-voltage state, the negative electrode voltage is in a low-voltage state, and interference is easily received when carrier signals at two ends of the inductor are collected when the voltage at two ends of the inductor is high voltage.
Referring to fig. 2, in some preferred embodiments of the present invention, the logic control unit controls the switching unit to be turned on and off through a fast switching unit. In the invention, when the fast breaker normally operates, the logic control unit opens the MOS switch N1 and the MOS switch N2 through the fast switch unit (S1) and the fast switch unit S2, at the moment, a power supply forms a conduction path from VIN + to VIN-, and a power supply output path from VOUT + to VOUT-, when the power supply output needs to be cut off, the fast switch unit S1 and the fast switch unit S2 respectively close the MOS switch N1 and the MOS switch N2, at the moment, the path from VIN + to VIN-is cut off, so that the output path from VOUT + to VOUT-is also cut off, and the output cannot be output to the later stage.
Preferably, the fast switch unit at least comprises 1 MOS switch, the G pole of the MOS switch is connected to the GPIO interface of the logic control unit, the S pole is grounded, and the D pole is connected to the G pole of another MOS switch through a voltage dividing resistor.
Referring to fig. 5, in some preferred embodiments, the fast switching unit includes a MOS switch Q1-1 and a MOS switch Q1-2, the S pole of the MOS switch Q1-1 is grounded and is connected to the GPIO _0 interface of the logic control unit through the G pole, and one end of a pull-down resistor R1-1 is connected between the G pole of the MOS switch Q1-1 and the GPIO _0 interface, and the other end is grounded through the S pole of the MOS switch Q1-1; the D pole of the MOS switch Q1-1 is connected to an external input power supply through a pull-up resistor R1-4, the external input maintains stable voltage input, meanwhile, the D pole of the MOS switch Q1-1 is connected to the G pole of the MOS switch Q1-2 through a resistor R1-2, a pull-down resistor R1-3 is connected to a connecting line of the resistor R1-2 and the G pole of the MOS switch Q1-2, and the other end of the resistor R1-2 is grounded through the S pole of the MOS switch Q1-2; the D pole of the MOS switch Q1-2 is connected to the G pole of the MOS switch (N1), a resistor R1-5 is arranged between the G pole of the MOS switch (N1) and the external input power supply, one end of a pull-up resistor R1-6 is connected to a connecting line of the resistor R1-5 and the G pole of the MOS switch (N1), and the other end of the pull-up resistor R1-6 is connected to the negative pole input of the first photovoltaic component (namely the S pole of the MOS switch (N1)).
In the invention, the resistance values of the resistors on the constituent circuits in the fast switch unit are correspondingly optimized, wherein the fast switch unit S1 and the fast switch unit S2 are the same unit, and the circuit constituent modes can be the same. Taking the fast switch unit S1 as an example, because the resistors R1-4, R1-2, and R1-3 are connected in series and then grounded, when the resistances of the resistors are low, a certain current will be lost in the electric energy input by the external power source, and the lower the resistance is, the more the corresponding loss is, so the resistances of the resistors cannot be too low. However, these resistors and other resistors in the unit together play a role of dividing voltage and adjusting voltage on different lines, so that it is necessary to ensure a corresponding proportion, and ensure that the Vg-Vs voltage difference, current, etc. of each MOS switch are within a proper range, thereby implementing the function of quickly turning off and turning on the corresponding MOS switch N.
In some preferred embodiments, the external input power source in the fast switching unit may be a photovoltaic module in the same system, and further, the power supply unit converts a high voltage input of the photovoltaic module into a low voltage output and supplies power to the fast switching unit.
In the invention, the electric energy output by the photovoltaic module can be converted into voltages with different sizes after being subjected to multi-stage DC/DC conversion through the power supply unit, and the voltages are respectively supplied to elements such as the logic control unit and an external input power supply. The unit for DC/DC converting the electric energy (mainly voltage) is not particularly limited, and a DC/DC converter known to those skilled in the art may be used, wherein the DC/DC converter includes a voltage converting circuit, and as long as the output voltage is determined, the DC/DC converter can convert by adjusting its own conversion ratio to output a corresponding determined voltage.
The DC/DC converter in the fast turn-off device provided by the present invention mainly supplies power to the logic control unit and the MOS switch, wherein the driving voltage of the logic control unit generally adopted is 3.3V, and in order to ensure the conduction of the MOS switch, the minimum voltage is generally ensured to be 8V. Meanwhile, the voltage conversion circuit in the DC/DC converter is damaged by the excessively high voltage, and the maximum voltage thereof is guaranteed not to be higher than 80V in the present invention. Therefore, the input voltage range of the DC/DC converter (i.e. the power supply unit) in the present invention is 8 to 80v, and the input voltage of the DC/DC converter is the output voltage of the photovoltaic module, so the output voltage threshold range of the photovoltaic module in the present invention is preferably 8 to 80v.
Embodiment 1, referring to fig. 3, 4 and 6, a fast breaker and system supporting two-way photovoltaic module input and having a monitoring function includes: the input ports are respectively connected with the positive electrode output and the negative electrode output of the first photovoltaic assembly and the second photovoltaic assembly; a decoupling capacitor C1 is arranged between the positive and negative output ends of the first photovoltaic module, a bypass diode D1 and a carrier signal coupling capacitor C2 are arranged between the positive output of the fast turn-off device and the positive output of the second photovoltaic module in parallel, the positive electrode of the bypass diode D1 is connected with the negative output of the first photovoltaic module through an MOS switch (N1), the negative electrode of the bypass diode D1 is connected with the positive output OUT + of the fast turn-off device, the positive output of the first photovoltaic module is connected to the negative output OUT + of the fast turn-off device through the decoupling capacitor C1, the negative electrode of the bypass diode D1 and one end of the carrier signal coupling capacitor C2, wherein the S electrode of the MOS switch (N1) is connected with the negative output of the first photovoltaic module, and the D electrode of the bypass diode D1 is connected with the positive electrode of the bypass diode D1; the G pole of the MOS switch (N1) is connected with the D pole of the MOS switch Q1-2, the G pole of the MOS switch (N1) is connected with a first external power supply (10V) through a resistor R1-5 (10K), one end of a resistor R1-6 (1M) is connected between the resistor R1-5 (10K) and the G pole of the MOS switch (N1), and the other end of the resistor R1-5 (10K) and the G pole of the MOS switch (N1) is connected between the negative electrode output of the first photovoltaic module and the S pole of the MOS switch (N1); the S pole of the MOS switch Q1-2 is grounded, the G pole of the MOS switch Q1-2 is connected with the D pole of the MOS switch Q1-1 through a resistor R1-2 (100K), one end of a resistor R1-3 (1M) is connected between the resistor R1-2 (100K) and the G pole of the MOS switch Q1-2, and the other end of the resistor R1-3 is grounded through the S pole of the MOS switch Q1-2; the D pole of the MOS switch Q1-1 is connected with the first external power supply (10V) through a resistor R1-4 (100K), the S pole of the MOS switch Q1-1 is grounded, the G pole of the MOS switch Q1-1 is connected with the GPIO _0 interface of the logic control unit, one end of the resistor R1-1 (10K) is connected between the GPIO _0 interface of the logic control unit and the G pole of the MOS switch Q1-1, and the other end of the resistor R1-1 is grounded through the S pole of the MOS switch Q1-1.
A decoupling capacitor C3 is arranged between the positive and negative electrode output ends of the second photovoltaic module, a bypass diode D2 and a carrier signal coupling capacitor C4 are arranged between the negative electrode output of the rapid breaker and the negative electrode output of the first photovoltaic module in parallel, the positive electrode of the bypass diode D2 is connected with the negative electrode output of the second photovoltaic module through an MOS switch (N2), the negative electrode of the bypass diode D2 is connected with the positive electrode output of the second photovoltaic module, the positive electrode output of the second photovoltaic module is connected to an inductor L after passing through the decoupling capacitor C3, the negative electrode of the bypass diode D2 and one end of the carrier signal coupling capacitor C4, and is connected to the negative electrode output OUT-of the rapid breaker through the inductor L; the MOS switch (N2) S pole is connected with the cathode output of the second photovoltaic component, the D pole is connected with the anode of the bypass diode D2, the G pole is connected with the D pole of the MOS switch Q2-2, the G pole of the MOS switch (N2) is connected with a second external power supply through a resistor R2-5 (10K), one end of a resistor R2-6 (1M) is connected between the resistor R2-5 (10K) and the G of the MOS switch (N2), and the other end of the resistor R2-5 (10K) is connected between the S pole of the MOS switch (N2) and the cathode output of the second photovoltaic component; the S pole of the MOS switch Q2-2 is grounded, the G pole of the MOS switch Q2-2 is connected to the D pole of the MOS switch Q2-1 through a resistor R2-2 (100K), one end of a resistor R2-3 (1M) is connected between the resistor R2-2 (100K) and the G pole of the MOS switch Q2-2, and the other end of the resistor R2-3 is grounded through the S pole of the MOS switch Q2-2; the D pole of the MOS switch Q2-1 is connected to a second external power supply through a pull-up resistor R2-4 (100K), the S pole of the MOS switch Q2-1 is grounded, and the G pole of the MOS switch Q2-1 is connected with a GPIO _1 interface of the logic control unit; one end of a resistor R2-1 (10K) is connected between the GPIO _1 interface of the logic control unit and the G pole of the MOS switch Q2-1, and the other end of the resistor R2-1 is grounded through the S pole of the MOS switch Q2-1.
Connecting the positive electrode and the negative electrode of the first photovoltaic assembly or the second photovoltaic assembly to the input of a power supply unit, inputting the high voltage of the photovoltaic assembly into the power supply unit, wherein the power supply unit comprises a two-stage voltage conversion circuit, reducing the voltage to 10V after the first-stage conversion by the power supply unit, and outputting the voltage to the first external power supply and the second external power supply; and meanwhile, the voltage of the first photovoltaic assembly and the voltage of the second photovoltaic assembly are subjected to secondary conversion, then the voltage is reduced to 3.3V, and the voltage is output to a VCC _ IN interface of the logic control unit to supply power for the logic control unit. And differential input ends RX _ N and RX _ P of the logic control unit are respectively connected between the negative electrode and the positive electrode of the inductor L and are used for collecting carrier communication signals at two ends of the inductor L.
In addition, a voltage sampling unit is arranged between the positive electrode and the negative electrode of the first photovoltaic assembly and the positive electrode and the negative electrode of the second photovoltaic assembly, and the voltage sampling unit is in communication connection with the logic control unit; the positive output of the photovoltaic module is connected with a resistor R1 (100K), the resistor R1 is connected with a resistor R2 (100K) and a resistor R3 (100K) in series, the other end of the resistor R3 (100K) is connected with a resistor R4 (2.49K), the other end of the resistor R3 (100K) is also connected to the positive input interface of the ADC1 of the metering chip, one end of a filter capacitor C31 (33 nF) is connected between the other end of the resistor R3 (100K) and the positive input interface of the ADC1 of the metering chip, and the other end of the filter capacitor C31 (33 nF) is grounded; the negative electrode input interface of the ADC1 of the metering chip is grounded through a resistor R5 (2.49K), one end of a capacitor 32 (33 nF) is connected between the resistor R5 (2.49K) and the negative electrode input interface of the ADC1 of the metering chip, and the other end of the capacitor is grounded. A current sampling unit is connected between the negative electrode output of the second photovoltaic module and an MOS switch (N2), and the current sampling unit is in communication connection with the logic control unit and controls current sampling of the logic control unit; the negative output of the photovoltaic module is connected with a resistor R41 (1.2K) and is connected to the negative input interface of the ADC2 of the metering chip through the resistor R41 (1.2K), one end of a capacitor C41 (33 nF) is connected between the resistor R41 (1.2K) and the negative input interface of the ADC2 of the metering chip, and the other end of the capacitor C41 (33 nF) is grounded; the positive input interface of the ADC2 of the metering chip is connected with the resistor R42 and is grounded through the resistor R42, one end of a capacitor 42 (33 nF) is connected between the resistor R42 (1.2K) and the positive input interface of the ADC2 of the metering chip, and the other end of the capacitor is grounded.
The working principle is as follows: the power supply unit converts the external environment into working voltage (3.3V) capable of driving the logic control unit to work after the external environment is irradiated by strong enough light and can convert the external environment into electric energy to a certain degree; and the logic control unit controls MOS switches (N1 and N2) on the cathode output circuits of the photovoltaic component 1 and the photovoltaic component 2 independently through two paths of GPIO signals.
The control method for the first photovoltaic module is as follows:
when the power-on initial state is realized, the GPIO of a processor (logic control unit) is in a high-impedance state, at the moment, the G pole of the MOS switch Q1-1 is provided with a pull-down resistor R1-1, and the S pole of the MOS switch Q1-1 is grounded, so that the G pole and the S pole are both in low level, the conduction condition of the MOS switch cannot be achieved (Vg-Vs is more than 2V), and the MOS switch Q1-1 is in a cut-off state; the D pole of the MOS switch Q1-1 is connected to 10V external voltage through a pull-up resistor R1-4, the level of the D pole of the MOS switch Q1-1 is 10V, the D pole is connected to the G pole of the MOS switch Q1-2 through a resistor R1-2, the G pole of the MOS switch Q1-2 is 10V at the moment, the S pole is connected directly, vg-Vs & gt 2V is met at the moment, the MOS switch Q1-2 is conducted, the level of the D pole is consistent with that of the S pole and is low level (ground); the G pole of the MOS switch (N1) is connected with the D pole of the MOS switch Q1-2, at the moment, the G pole of the MOS switch N1 is also at a low level (ground), and the S pole of the MOS switch is the negative pole (ground) of the connecting component 1, so that Vg and Vs have no level difference, and the MOS switch N1 is in a cut-off state (turn-off state).
When the logic control unit has enough driving voltage and outputs high level to GPIO _0, the G pole level of MOS switch Q1-1 becomes high, vg and Vs generate voltage difference, at this time, MOS switch Q1-1 is conducted, and the D pole level is consistent with the S pole level (is ground); the G pole of the MOS switch Q1-2 is connected with the D pole of the MOS switch Q1-1, so that the G pole of the MOS switch Q1-2 is also at low level (ground), and the MOS switch Q1-2 is in a cut-off state; when the MOS switch Q1-2 is cut off, the D pole of the MOS switch Q1-2 is connected to 10V external voltage through a pull-up resistor R1-5 (10K), so that the D pole of the MOS switch Q1-2 is at a high level (10V), the G pole of the MOS switch N1 is also at a high level, the Vg and Vs of the MOS switch N1 generate a pressure difference, the MOS switch N1 is switched on, and the first photovoltaic module outputs power to supply power to a back-end system component.
The control method of the second photovoltaic module is similar to the control method of the first photovoltaic module, and the control method is controlled by the high level or the low level output by the GPIO interface of the logic control unit. The two photovoltaic modules can be connected simultaneously or separately. When the two paths of assemblies are connected simultaneously and the MOS switch N1/N2 is conducted, the output voltage of the assemblies passing through the quick breaker is the superposition of the input voltages of the two paths of photovoltaic assemblies; when one of the photovoltaic modules needs to be turned off, for example, the MOS switch N2 is turned off, at this time, the electric energy of the first photovoltaic module can still be transmitted through the MOS switch N1, and the second photovoltaic module cannot transmit the electric energy because the MOS switch N2 is turned off, but because the bypass diode D2 and the capacitor C4 are arranged at the rear end of the MOS switch N2, the electric energy of the first photovoltaic module can be coupled to the output OUT-through the bypass diode D2 and the capacitor C4, so that the electric energy of the first photovoltaic module can still be output; similarly, when the MOS switch N1 is turned off, the electric energy of the second photovoltaic module is coupled to OUT + through the bypass diode D1 and the capacitor C2 at the rear end of the MOS switch N1, so that the electric energy of the second photovoltaic module can also be output to the rear end. When the first photovoltaic module and the second photovoltaic module have different broadcast-television conversion capacities and the output voltages are inconsistent, the voltage superposition output of the first photovoltaic module and the second photovoltaic module is not influenced; if the input currents are inconsistent and have large differences, the rear-end grid-connected inverter can perform power regulation on the whole string, so that the string currents tend to be consistent.
In summary, the first photovoltaic module and the second photovoltaic module can be controlled independently by outputting the high level or the low level through the GPIO interface of the logic control unit, and the electric energy of the first photovoltaic module and the electric energy of the second photovoltaic module are output to the rear-stage module in the photovoltaic system independently or in a superimposed manner. When the photovoltaic system detects that a certain photovoltaic module operates abnormally, the remote control unit such as the upper computer sends an instruction for switching off the abnormal photovoltaic module to the logic control unit, and the logic control unit outputs a low level to the corresponding GPIO interface according to the specific instruction, so that the corresponding MOS switch for controlling the power output of the photovoltaic module is switched off by twice inversion of the quick switching unit. And when the quick turn-off device needs to be started to output the power of the photovoltaic module to the rear-stage module, the corresponding GPIO interface of the logic control unit is output to high level.
In addition, the voltage threshold value set in a chip built in the logic control unit can be 8 to 80V, and the current threshold value is 0 to 20A. And the logic control unit periodically sends heartbeat signals to the voltage monitoring unit and the current monitoring unit, and performs data interaction with the monitoring units. When the voltage detected by a voltage monitoring unit in the quick shutoff device is lower than 8V or higher than 80V, the logic control unit can judge according to the logic of the logic control unit, and does not need to issue a shutoff instruction through a platform, so that the system can be quickly shut off, and power is not supplied to the rear end; similarly, when the current detected by the current monitoring unit in the fast turn-off device is higher than 20A, the processor judges according to the logic of the processor, and the system can be quickly turned off without issuing a turn-off instruction through the platform, so that power is not supplied to the back end.
Referring to fig. 8, another embodiment of the present invention provides a photovoltaic power generation system including the above-mentioned fast shutdown device with monitoring function supporting two-way photovoltaic module input, where the photovoltaic system is a distributed photovoltaic system, and includes n photovoltaic modules and n/2 fast shutdown devices (i.e. MRSD), and four input ports of the fast shutdown device are respectively connected to positive output and negative output of two photovoltaic modules; at least one of the output ports of the rapid shutoff devices is connected with the output ports of other rapid shutoff devices in series to form a photovoltaic group string; the n photovoltaic groups are connected in series and parallel to form a photovoltaic array; and the photovoltaic array and the rear-stage photovoltaic module are connected to form the photovoltaic power generation system. The embodiment also includes the inverter, the upper computer, the communication system and other components of the general distributed photovoltaic system, which are well known to those skilled in the art, and the related known components and the related connection mode are not particularly limited in the present invention, and can be adopted in a conventional mode.
The above description is merely an exemplary embodiment of the present disclosure, and the scope of the present disclosure is not limited thereto. That is, all equivalent changes and modifications made in accordance with the teachings of the present disclosure are intended to be included within the scope of the present disclosure. Embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (10)
1. The utility model provides a support two way photovoltaic module input to have quick turn-off ware of monitoring function which characterized in that, it includes:
the input ports are respectively connected with the positive electrode output and the negative electrode output of the first photovoltaic assembly and the second photovoltaic assembly;
the switch unit at least comprises 2 groups of MOS switches which are respectively arranged on the negative pole circuits of the first photovoltaic component and the second photovoltaic component, wherein the negative pole of the first photovoltaic component is connected with the positive pole of the second photovoltaic component through 1 group of MOS switches;
the logic control unit is used for controlling the on and off of the switch unit;
and the power supply unit converts high-voltage input into low-voltage output and supplies power to the logic control unit.
2. The fast shutoff device supporting two-way photovoltaic module input and having the monitoring function according to claim 1, further comprising voltage sampling units respectively arranged between the positive output and the negative output of the photovoltaic module; and the voltage sampling unit is in communication connection with the logic control unit.
3. The fast breaker supporting two-way photovoltaic module input and having the monitoring function according to claim 2, wherein the voltage sampling unit samples the output voltage of the photovoltaic module after receiving the sampling instruction of the logic control unit.
4. The fast shutoff device supporting two-way photovoltaic module input and having the monitoring function according to any one of claims 1 to 3, characterized in that an inductor is arranged on a negative electrode line of the second photovoltaic module, and one end of the inductor is connected with a negative electrode output of the second photovoltaic module through a group of MOS switches.
5. The fast breaker supporting two-way photovoltaic module input and having the monitoring function according to claim 4, characterized in that the logic control unit is in communication connection with the inductive carrier; further, the logic control unit receives a carrier signal between the positive electrode and the negative electrode of the inductance differential circuit.
6. The fast shutoff device supporting two-way photovoltaic module input and having a monitoring function according to claim 1, characterized in that a current sampling unit is arranged on a negative output line of the second photovoltaic module, and the current sampling unit is in communication connection with the logic control unit; further, the current sampling unit samples the current flowing through the second photovoltaic module after receiving the sampling instruction of the logic control unit.
7. The fast breaker supporting two-way photovoltaic module input and having the monitoring function according to claim 1, wherein a bypass diode and a capacitor are respectively arranged between the positive electrode output and the negative electrode output of the first photovoltaic module and the second photovoltaic module; the anode of the bypass diode is connected with the first photovoltaic assembly or the second photovoltaic assembly through a group of MOS switches, and the cathode of the bypass diode is connected with the anode output of the first photovoltaic assembly or the second photovoltaic assembly.
8. The fast breaker supporting two-way photovoltaic module input and having the monitoring function according to claim 6, wherein the logic control unit controls the on and off of the switch unit through a fast switch unit; preferably, the fast switch unit at least comprises 1 MOS switch, the G pole of the MOS switch is connected to the GPIO interface of the logic control unit, the S pole is grounded, and the D pole is connected to the G pole of another MOS switch through a voltage dividing resistor.
9. The fast breaker supporting two-way photovoltaic module input and having the monitoring function according to claim 8, wherein the power supply unit converts a high-voltage input into a low-voltage output and supplies power to the fast switch unit.
10. A photovoltaic power generation system is characterized by comprising the rapid shutoff device which supports two-way photovoltaic module input and has a monitoring function as claimed in any one of claims 1 to 9, and further comprising a plurality of photovoltaic modules; four input ports of the quick breaker are respectively connected with the positive output and the negative output of the two photovoltaic modules; at least one of the output ports of the rapid shutoff devices is connected with the output ports of other rapid shutoff devices in series to form a photovoltaic string; the photovoltaic groups are connected in series and parallel to form a photovoltaic array; and the photovoltaic array and the rear-stage photovoltaic module are connected to form the photovoltaic power generation system.
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| CN116169997B (en) * | 2023-02-22 | 2023-08-22 | 上海劭能新能源科技有限公司 | Quick turn-off device and system supporting different control modes of two paths of photovoltaic modules |
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|---|---|
| CN115764817B (en) | 2023-06-23 |
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