CN114783842A - Voltage-loss brake-separating tripping method and system for multifunctional photovoltaic circuit breaker - Google Patents
Voltage-loss brake-separating tripping method and system for multifunctional photovoltaic circuit breaker Download PDFInfo
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- CN114783842A CN114783842A CN202210548939.6A CN202210548939A CN114783842A CN 114783842 A CN114783842 A CN 114783842A CN 202210548939 A CN202210548939 A CN 202210548939A CN 114783842 A CN114783842 A CN 114783842A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/42—Induction-motor, induced-current, or electrodynamic release mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/12—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by voltage falling below a predetermined value, e.g. for no-volt protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for switches
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Abstract
The invention provides a method and a system for tripping a voltage-loss tripping of a multifunctional photovoltaic circuit breaker, wherein the method comprises a power grid voltage judgment unit, a voltage frequency of a line is monitored in real time, and whether a voltage-loss fault occurs in the line is judged; when a voltage loss fault occurs to a line, the magnetic flux tripping unit executes tripping action of the circuit breaker, and after limited time, the motor tripping unit returns to the original position in a no-load mode to complete magnetic flux tripping and brake separating; the opening and closing state detection unit detects the opening and closing state after magnetic flux tripping and opening, if the magnetic flux tripping is not in the opening state, the motor tripping unit executes tripping action of the circuit breaker, and if the magnetic flux tripping is in the opening state, the motor tripping unit is driven to return to the zero-load state; according to the intelligent multifunctional photovoltaic circuit breaker, two energy storage units, two tripping modes and two power grid voltage judging modes are arranged, so that the problems of poor tripping due to incapability of tripping in case of voltage loss and failure of motor position detection are completely solved under the double protection of magnetic flux tripping and motor tripping, and the action reliability of the intelligent multifunctional photovoltaic circuit breaker is better improved.
Description
Technical Field
The invention belongs to the field of low-voltage power distribution, and particularly relates to a voltage-loss opening tripping method and system for a multifunctional photovoltaic circuit breaker.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The current market is more and more widely applied to intelligent circuit breakers, in a photovoltaic system, a distributed photovoltaic grid-connected circuit breaker is positioned at a grid-connected point of the distributed photovoltaic system, and in order to protect the safety of photovoltaic power generation and city electric connection, the photovoltaic grid-connected circuit breaker is required to be capable of cutting off the connection between the photovoltaic power generation system and city electric power after the mains supply is powered off; the existing distributed photovoltaic grid-connected circuit breaker can reliably realize the opening and tripping of the circuit breaker under the conditions of overvoltage and undervoltage, but when the circuit breaker is in voltage loss, no voltage exists in a power grid, and the distributed photovoltaic grid-connected circuit breaker does not act due to insufficient electronic energy storage or failure of an electronic detection switch and the like; in addition, due to the existence of power electronic devices in the photovoltaic power generation system, harmonic interference exists in a circuit, the sampling voltage of the photovoltaic grid-connected circuit breaker is influenced, and further misoperation of the distributed photovoltaic grid-connected circuit breaker is caused.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a voltage-loss tripping method and system of a multifunctional photovoltaic circuit breaker, which completely solve the problem of poor tripping of the tripping caused by voltage loss incapability of tripping and failure of motor position detection under the double protection of magnetic flux tripping device and motor action tripping by arranging two energy storage units, two tripping modes and two power grid voltage judging modes, and better improve the protection capability of the intelligent multifunctional photovoltaic circuit breaker.
To achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
the invention provides a voltage-loss brake-separating tripping system of a multifunctional photovoltaic circuit breaker in a first aspect;
a voltage-loss opening and tripping system of a multifunctional photovoltaic circuit breaker comprises a power grid voltage judgment unit, a magnetic flux tripping unit, a motor tripping unit and an opening and closing state detection unit;
the power grid voltage judging unit monitors the voltage frequency of the line in real time and judges whether the line has a voltage loss fault;
when a voltage loss fault occurs to a line, the magnetic flux tripping unit executes tripping action of the circuit breaker, and after limited time, the motor tripping unit returns to the original position in a no-load mode to complete magnetic flux tripping and brake separating;
the opening and closing state detection unit detects the opening and closing state after the magnetic flux tripping and the opening, if the magnetic flux tripping is not in the opening state, the motor tripping unit executes the tripping action of the circuit breaker, and if the magnetic flux tripping is in the opening state, the motor tripping unit is driven to return to the zero-load state.
Furthermore, the system also comprises an energy storage unit and an MCU main control unit;
the energy storage unit includes: the first DC energy storage unit and the second DC energy storage unit.
Furthermore, the grid voltage judgment unit comprises a single-phase current voltage sampling processing unit, a three-phase current voltage sampling processing unit and a grid voltage detection unit.
Furthermore, when harmonic interference exists in the circuit, the single-phase and three-phase current and voltage sampling processing unit measures data with high precision and accurately judges the voltage state of the circuit;
and the power grid voltage detection unit is used for rapidly detecting the voltage loss state of the line when the line is in voltage loss.
Further, the magnetic flux tripping unit comprises a magnetic flux driving unit and a magnetic flux tripping execution unit which are connected with each other;
the motor tripping unit comprises a motor driving unit and a motor tripping execution unit which are connected.
Furthermore, the magnetic flux tripping unit is powered by the first DC energy storage unit and is controlled by the MCU main control unit, and the magnetic flux driving unit drives the magnetic flux tripping execution unit to execute tripping; the motor driving unit is powered by the second DC energy storage unit and is controlled by the MCU main control unit, and the motor driving unit drives the motor tripping execution unit to execute tripping.
Furthermore, the energy storage unit also comprises a first switching power supply conversion processing unit and a second switching power supply conversion processing unit, the first DC energy storage unit is provided with voltage by the first switching power supply conversion processing unit and the second switching power supply conversion processing unit together, the two switching power supplies improve the stability and the energy storage efficiency of the power supply, and the second DC energy storage unit is independently powered by the second switching power supply conversion processing unit.
Furthermore, the device also comprises a single-phase power supply input and three-phase power supply protection and rectification unit;
the single-phase power supply input and protection and rectification unit and the three-phase power supply input and protection and rectification unit respectively supply power to the first switching power supply conversion processing unit, the second switching power supply conversion processing unit, the power grid voltage detection unit and the single-phase current and three-phase current and voltage sampling processing unit.
The invention provides a voltage-loss brake-separating tripping method of a multifunctional photovoltaic circuit breaker in a second aspect.
A voltage-loss tripping method for a multifunctional photovoltaic circuit breaker comprises the following steps:
monitoring the voltage frequency of the line in real time, and judging whether the line has a voltage loss fault;
when a voltage loss fault occurs to a line, the magnetic flux tripping unit executes a circuit breaker tripping action within a limited time s1, and after the limited time s1, the motor tripping unit returns to the original position in a no-load mode to complete magnetic flux tripping and brake separating;
and detecting the opening and closing state after the magnetic flux tripping and the opening, wherein if the magnetic flux tripping and the opening are not in the opening state, the motor tripping unit executes the tripping action of the circuit breaker within the limited time s2, and if the magnetic flux tripping and the opening state are in the opening state, the motor tripping unit is driven to return to the zero-load state.
Further, the limit time s1 is 10ms, and the limit time s2 is 500 ms.
The above one or more technical solutions have the following beneficial effects:
when harmonic interference exists in the circuit, the voltage state of the circuit can be accurately judged through the high-precision measurement and harmonic processing functions of the single-phase current and three-phase current and voltage sampling processing units of the multifunctional photovoltaic circuit breaker, and the accuracy of the judgment of the voltage state of the circuit in a harmonic interference environment is improved;
when the line is in voltage loss, the line voltage loss state can be quickly detected through the power grid voltage sampling processing unit of the multifunctional photovoltaic circuit breaker, the energy consumption of the photovoltaic circuit breaker on the energy storage capacitor after the line is in voltage loss is reduced, and the switching-off speed and reliability of the photovoltaic circuit breaker in the line voltage loss state are improved;
when the circuit is in voltage loss, the magnetic flux tripping execution unit can be tripped within 10ms by controlling the magnetic flux driving unit of the multifunctional photovoltaic circuit breaker, and then the motor tripping execution unit is driven to return to the original position, so that the voltage loss brake separating of the multifunctional photovoltaic circuit breaker is completed;
when the circuit voltage loss and magnetic flux tripping execution unit fails to operate, the motor driving unit of the multifunctional photovoltaic circuit breaker can be controlled to enable the motor tripping execution unit to operate within 500ms, so that the voltage loss brake of the multifunctional photovoltaic circuit breaker is driven;
when the circuit is in voltage loss, the magnetic flux tripping execution unit is adopted to trip the circuit breaker, and then the motor tripping execution unit is driven to return to the original position in an idle state, so that the energy consumption of the opening action is reduced, and the condition that the opening of the multifunctional circuit breaker fails due to insufficient energy storage can be greatly reduced.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a system configuration diagram of the first embodiment.
Fig. 2 is a circuit diagram of a single-phase and three-phase current and voltage sampling processing unit.
Fig. 3 is a circuit diagram of a grid voltage detection unit.
Fig. 4 is a circuit diagram of the first DC energy storing unit.
Fig. 5 is a circuit diagram of a second DC energy storage unit.
Fig. 6 is a circuit diagram of the first switching power supply conversion processing unit.
Fig. 7 is a circuit diagram of a second switching power supply conversion processing unit.
Fig. 8 is a circuit diagram of a magnetic flux trip unit.
Fig. 9 is a circuit diagram of a motor trip unit.
FIG. 10 is a flowchart of a method of the second embodiment.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be understood that the terms "comprises" and "comprising", and any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiments and features of the embodiments of the invention may be combined with each other without conflict.
Example one
The embodiment discloses a voltage-loss opening tripping system of a multifunctional photovoltaic circuit breaker;
as shown in fig. 1, the voltage-loss tripping system of the multifunctional photovoltaic circuit breaker comprises a circuit breaker body, a power grid voltage judging unit, a magnetic flux tripping unit, a motor tripping unit, a switching-on/off state detecting unit, an energy storage unit and an MCU (microprogrammed control unit), wherein the circuit breaker body has the functions of overcurrent, short circuit, isolation and the like of a circuit.
Power grid voltage judging unit
And the power grid voltage judging unit comprises a single-phase current voltage sampling processing unit, a three-phase current voltage sampling processing unit and a power grid voltage detecting unit and is used for monitoring the abnormal condition of the line voltage frequency in real time.
When harmonic interference exists in the line, the voltage state of the line is accurately judged through high-precision measurement data of the single-phase current sampling processing unit, the three-phase current sampling processing unit and the voltage sampling processing unit, and the reliability of judging the voltage state of the line in a harmonic interference environment is improved.
When the line is in voltage loss, the line voltage loss state can be quickly detected through the power grid voltage detection unit of the multifunctional photovoltaic circuit breaker, the energy consumption of the photovoltaic circuit breaker on the energy storage capacitor after the line is in voltage loss is reduced, and the switching-off speed and the reliability of the photovoltaic circuit breaker in the line voltage loss state are improved.
The circuit diagrams of the single-phase current voltage sampling processing unit, the three-phase current voltage sampling processing unit and the power grid voltage detection unit are respectively shown in fig. 2 and fig. 3, and are jointly judged by the single-phase current voltage sampling processing unit, the three-phase current voltage sampling processing unit and the power grid voltage detection unit, the high voltage at the incoming line side of the multifunctional photovoltaic circuit breaker passes through two groups of independent sampling units, voltage signals are respectively transmitted to an ADC (analog to digital converter) of an MCU (microprogrammed control unit) main control unit and the single-phase current voltage sampling processing unit and the three-phase current voltage sampling processing unit through the power grid voltage detection unit and then transmitted to the MCU main control unit, the MCU main control unit samples the voltage signals in real time through the ADC, the voltage signals are transmitted to an internal memory through the DMA, and the real-time value V1 of the voltage at the incoming line end is obtained through digital filtering and software calculation. The single-phase and three-phase current and voltage sampling processing unit samples, sets and calculates voltage signals through an internal ASIC hardware circuit, transmits data to the MCU main control unit through the SPI, and obtains an incoming line end voltage effective value V2 after the MCU main control unit converts the voltage signals. When the voltage of the power grid is over, under-voltage and harmonic interference, the main control chip quickly and reliably finishes the judgment of voltage abnormity by comprehensively judging V1 and V2.
The power grid voltage detection unit transmits signals to an ADC (analog to digital converter) sampling unit of the MCU main control unit, and the single-phase and three-phase sampling processing unit is processed by an internal circuit of a special measuring chip and then transmitted to the MCU main control unit in a bus communication mode (SPI); the two sampling modes are different, one mode is that an ADC sampling unit of the MCU directly acquires voltage parameters, and the mode has high acquisition and conversion speed but lower precision; the other type is that after the line voltage and current are collected and processed through a special measuring chip, a measuring result is sent to the MCU main control unit through an SPI communication mode, and the mode is high in measuring accuracy and low in collecting and converting speed.
The two detection modes improve the accuracy and timeliness of the detection of the line voltage frequency abnormal state by the product; typical characteristic parameters of the two detection modes are as follows:
| name of sampling unit | Single, three phase current, voltage sampling processing unit | Power grid voltage detection unit |
| Sampling accuracy | 0.5% | 1% |
| Sample switching speed (ms) | 100 | 20 |
Energy storage unit
The energy storage unit comprises a first DC energy storage unit, a second DC energy storage unit, a first switching power supply conversion processing unit and a second switching power supply conversion processing unit.
The first DC energy storage unit, a circuit diagram of which is shown in fig. 4, has an energy storage function, and receives voltage input functions of the first switching power supply conversion processing unit and the second switching power supply conversion processing unit.
The second DC energy storage unit, as shown in fig. 5, has an energy storage function, and receives the voltage input function of the switching power supply conversion processing unit 2.
The circuit diagrams of the first switching power supply conversion processing unit and the second switching power supply conversion processing unit are respectively shown in fig. 6 and fig. 7, and the first switching power supply conversion processing unit and the second switching power supply conversion processing unit have the function of quickly starting to supply voltage.
The first DC energy storage unit is provided with voltage by the first switching power supply conversion processing unit and the second switching power supply conversion processing unit together, the two switching power supplies improve power stability and energy storage efficiency, the second DC energy storage unit is independently powered by the second switching power supply conversion processing unit, two energy storage schemes can better provide action energy for the tripping execution unit, the action reliability of the tripping execution mechanism under the voltage loss state of a line is improved, the minimum rectification voltage is ensured to be more than 70Vdc, and the following relation can be obtained according to the charge-discharge energy of a capacitor:
wherein, the first and the second end of the pipe are connected with each other,
is the capacity of the capacitor(s),
is the voltage at the minimum ac terminal,
in order to minimize the dc-terminal voltage,
the time for the input voltage to bottom out from the highest point,
for charging completionThe time required for the completion of the treatment,
the power is converted for the electric energy at the output end,
the conversion efficiency of the switching power supply.
The capacitance is calculated by the formula:
the first DC energy storage unit and the second DC energy storage unit simultaneously provide voltage to the DCDC voltage conversion unit to work, then transmit the voltage to the MCU main control unit to work, and the main function is to provide stable voltage and energy to the MCU main control unit to process voltage loss and undervoltage event instructions and correctly issue the instructions, so that the multifunctional photovoltaic circuit breaker is ensured to be normally tripped when the voltage loss and the undervoltage occur.
The two switching power supplies work independently, the stability of products in opening and closing can be improved by using the two switching power supplies in the multifunctional photovoltaic circuit breaker, potential safety hazards caused by failure of one circuit are avoided, the energy storage efficiency of the DC energy storage unit is improved, and reliable actions of the magnetic flux tripping control unit and the motor tripping control unit in voltage loss are ensured.
Trip unit
The tripping unit comprises a magnetic flux tripping unit and a motor tripping unit, the magnetic flux tripping unit comprises a magnetic flux driving unit and a magnetic flux tripping execution unit which are connected, and the motor tripping unit comprises a motor driving unit and a motor tripping execution unit which are connected.
The circuit breaker comprises an execution unit, a motor driving unit, a motor tripping execution unit, a magnetic flux driving unit and a motor tripping execution unit, wherein the execution unit realizes the action functions of automatic closing and tripping of the circuit breaker, the magnetic flux tripping execution unit realizes the automatic tripping action function of the circuit breaker, the motor driving unit has the function of driving the magnetic flux tripping execution unit to trip, and the motor driving unit has the function of driving the motor tripping execution unit to automatically close and trip.
The magnetic flux tripping unit is powered by the first DC energy storage unit and controlled by the MCU main control unit, the magnetic flux driving unit drives the magnetic flux tripping execution unit to execute tripping, and a circuit diagram is shown in FIG. 8; the first DC energy storage unit is powered and stored by the first switching power supply conversion processing unit and the second switching power supply conversion processing unit at the same time, and supplies power for the magnetic flux driving unit and the magnetic flux tripping execution unit.
The motor driving unit is powered by the second DC energy storage unit and is controlled by the MCU main control unit, the motor driving unit drives the motor tripping execution unit to execute tripping, and a circuit diagram is shown in fig. 9; the second DC energy storage unit is used for power supply and energy storage by the second switching power supply conversion processing unit and supplying power to the motor driving unit and the motor tripping execution unit.
The multifunctional photovoltaic circuit breaker is in two voltage loss tripping execution modes, namely magnetic flux tripping (high response speed and high sensitivity) and motor action tripping, has double protection functions, can provide energy for the energy storage unit to work when the voltage of a power grid is over-voltage and under-voltage, but cannot provide energy for the multifunctional photovoltaic circuit breaker to work for a long time because the power grid has no voltage during voltage loss, can cause insufficient energy storage or failure of energy storage during voltage loss, and cannot normally trip; therefore, one path of direct current magnetic flux tripping unit is independently added, when the MCU main control unit detects the voltage loss, a tripping instruction is firstly issued to the magnetic flux tripping unit, the magnetic flux tripping unit executes a tripping action, then the MCU main control unit issues the tripping instruction to the motor tripping unit again, the motor tripping unit executes the tripping action, the two tripping mode energy storage units are independent, under the double protection of the magnetic flux tripper and the motor action tripping, the problem that the voltage loss can not be tripped and the tripping of a brake caused by the failure of motor position detection is completely solved, and the action reliability of the intelligent multifunctional photovoltaic circuit breaker is better improved through the two modes of the magnetic flux tripping and the motor action tripping.
The single-phase power supply input and protection and rectification unit and the three-phase power supply input and protection and rectification unit respectively supply power to the first switching power supply conversion processing unit, the second switching power supply conversion processing unit, the power grid voltage detection unit and the single-phase and three-phase current and voltage sampling processing unit.
Example two
The embodiment discloses a voltage-loss brake-separating tripping method of a multifunctional photovoltaic circuit breaker;
as shown in fig. 10, a voltage-loss tripping method for a multifunctional photovoltaic circuit breaker includes:
monitoring the voltage frequency of the line in real time, and judging whether the line has a voltage loss fault;
when a voltage loss fault occurs to a line, the magnetic flux tripping unit executes a circuit breaker tripping action within a limited time s1, and after the limited time s1, the motor tripping unit returns to the original position in a no-load mode to complete magnetic flux tripping and brake separating;
and detecting the opening and closing state after the magnetic flux tripping and the opening, wherein if the magnetic flux tripping and the opening are not in the opening state, the motor tripping unit executes the tripping action of the circuit breaker within the limited time s2, and if the magnetic flux tripping and the opening state are in the opening state, the motor tripping unit is driven to return to the zero-load state.
In the present embodiment, the limit time s1 is set to 10ms, and the limit time s2 is set to 500 ms.
The voltage frequency of the line is monitored in real time, and when harmonic interference exists in the line, the voltage state of the line is accurately judged through high-precision measurement data of the single-phase current voltage sampling processing unit and the three-phase current voltage sampling processing unit, and the reliability of judging the voltage state of the line in a harmonic interference environment is improved.
When the line is in voltage loss, the grid voltage detection unit of the multifunctional photovoltaic circuit breaker is used for quickly detecting the voltage loss state of the line, reducing the energy consumption of the photovoltaic circuit breaker on the energy storage capacitor after the line is in voltage loss, and improving the switching-off speed and reliability of the photovoltaic circuit breaker in the voltage loss state of the line.
The two detection modes are mutually matched, so that the accuracy and timeliness of the product for detecting the abnormal state of the line voltage frequency are improved, and the typical characteristic parameters of the two detection modes are as follows:
| name of sampling Unit | Single-phase and three-phase current and voltage sampling and processing unit | Power grid voltage detection unit |
| Sampling accuracy | 0.5% | 1% |
| Sample switching speed (ms) | 100 | 20 |
When the circuit has an over-under-voltage and under-voltage condition, the MCU main control unit drives the magnetic flux tripping unit to perform tripping processing, tripping and quick response are completed within 10ms, meanwhile, the switching-off and switching-on state detection unit judges and identifies the state of the circuit breaker, after the identification is completed, the MCU main control unit drives the motor tripping unit to complete the tripping or returning processing of the motor, the action implementation flow is shown in figure 10, and typical parameters of two tripping modes are as follows:
the above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. A voltage-loss brake-separating tripping system of a multifunctional photovoltaic circuit breaker is characterized by comprising a circuit breaker body, a power grid voltage judging unit, a magnetic flux tripping unit, a motor tripping unit and a brake-separating and closing state detecting unit;
the power grid voltage judging unit monitors the voltage frequency of the line in real time and judges whether the line has a voltage loss fault;
when a voltage loss fault occurs to a line, the magnetic flux tripping unit executes tripping action of the circuit breaker, and after limited time, the motor tripping unit returns to the original position in a no-load mode to complete magnetic flux tripping and brake separating;
the opening and closing state detection unit detects the opening and closing state after the magnetic flux tripping and the opening, if the magnetic flux tripping is not in the opening state, the motor tripping unit executes the tripping action of the circuit breaker, and if the magnetic flux tripping is in the opening state, the motor tripping unit is driven to return to the zero-load state.
2. The voltage-loss tripping system of the multifunctional photovoltaic circuit breaker of claim 1, further comprising an energy storage unit and an MCU master control unit;
the energy storage unit includes: the first DC energy storage unit and the second DC energy storage unit.
3. The voltage-loss tripping system of claim 1, wherein the grid voltage judging unit comprises a single-phase current and voltage sampling and processing unit, a three-phase current and voltage sampling and processing unit and a grid voltage detecting unit.
4. The voltage-loss tripping system of the multifunctional photovoltaic circuit breaker as recited in claim 3,
the single-phase and three-phase current and voltage sampling processing unit measures data with high precision and accurately judges the voltage state of the circuit when harmonic interference exists in the circuit;
and the power grid voltage detection unit is used for rapidly detecting the voltage loss state of the line when the line is in voltage loss.
5. The voltage-loss tripping system of claim 1, wherein the magnetic flux tripping unit comprises a magnetic flux driving unit and a magnetic flux tripping executing unit which are connected with each other;
the motor tripping unit comprises a motor driving unit and a motor tripping execution unit which are connected.
6. The voltage-loss tripping system of the multifunctional photovoltaic circuit breaker according to claim 5,
the magnetic flux tripping unit is powered by the first DC energy storage unit and controlled by the MCU main control unit, and the magnetic flux driving unit drives the magnetic flux tripping execution unit to execute tripping; the motor driving unit is powered by the second DC energy storage unit and is controlled by the MCU main control unit, and the motor driving unit drives the motor tripping execution unit to execute tripping.
7. The voltage-loss breaking tripping system of claim 1, wherein the energy storage unit further comprises a first switching power supply conversion processing unit and a second switching power supply conversion processing unit, the first DC energy storage unit is provided with voltage by the first switching power supply conversion processing unit and the second switching power supply conversion processing unit together, the two switching power supplies improve power stability and energy storage efficiency, and the second DC energy storage unit is independently provided with power by the second switching power supply conversion processing unit.
8. The voltage-loss tripping system of the multifunctional photovoltaic circuit breaker as recited in claim 1, further comprising single and three-phase power input and protection and rectification units;
the single-phase power supply input and protection and rectification unit and the three-phase power supply input and protection and rectification unit respectively supply power to the first switching power supply conversion processing unit, the second switching power supply conversion processing unit, the power grid voltage detection unit and the single-phase and three-phase current and voltage sampling processing unit.
9. A voltage-loss tripping method of a multifunctional photovoltaic circuit breaker based on the system of any one of claims 1-8, characterized in that: the method comprises the following steps:
monitoring the voltage frequency of the line in real time, and judging whether the line has a voltage loss fault;
when a voltage loss fault occurs to a line, the magnetic flux tripping unit executes a circuit breaker tripping action within a limited time s1, and after the limited time s1, the motor tripping unit returns to the original position in a no-load mode to complete magnetic flux tripping and brake separating;
and detecting the opening and closing state after the magnetic flux tripping and the opening, wherein if the magnetic flux tripping is not in the opening state, the motor tripping unit executes the tripping action of the circuit breaker within the limited time s2, and if the magnetic flux tripping is in the opening state, the motor tripping unit is driven to return to the zero-load state.
10. The voltage-loss tripping method for the multifunctional photovoltaic circuit breaker as claimed in claim 9, wherein the limit time s1 is 10ms, and the limit time s2 is 500 ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210548939.6A CN114783842A (en) | 2022-05-20 | 2022-05-20 | Voltage-loss brake-separating tripping method and system for multifunctional photovoltaic circuit breaker |
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Citations (5)
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| CN205355784U (en) * | 2016-01-27 | 2016-06-29 | 常熟开关制造有限公司(原常熟开关厂） | Take time delay function's under -voltage controller |
| CN110061566A (en) * | 2019-05-20 | 2019-07-26 | 广东佛电电器有限公司 | Internet of Things low-voltage platform area distribution transforming intelligent Circuit Breaker Controller |
| CN111326366A (en) * | 2020-03-28 | 2020-06-23 | 天津市华明合兴机电设备有限公司 | Fault arc protection circuit breaker with double tripper and tripping method thereof |
| CN213845194U (en) * | 2021-01-28 | 2021-07-30 | 南京正泰龙科技有限公司 | Miniature circuit breaker |
| CN114188971A (en) * | 2021-11-10 | 2022-03-15 | 广东电网有限责任公司广州供电局 | Photovoltaic box-type substation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205355784U (en) * | 2016-01-27 | 2016-06-29 | 常熟开关制造有限公司(原常熟开关厂） | Take time delay function's under -voltage controller |
| CN110061566A (en) * | 2019-05-20 | 2019-07-26 | 广东佛电电器有限公司 | Internet of Things low-voltage platform area distribution transforming intelligent Circuit Breaker Controller |
| CN111326366A (en) * | 2020-03-28 | 2020-06-23 | 天津市华明合兴机电设备有限公司 | Fault arc protection circuit breaker with double tripper and tripping method thereof |
| CN213845194U (en) * | 2021-01-28 | 2021-07-30 | 南京正泰龙科技有限公司 | Miniature circuit breaker |
| CN114188971A (en) * | 2021-11-10 | 2022-03-15 | 广东电网有限责任公司广州供电局 | Photovoltaic box-type substation |
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