CN216699515U

CN216699515U - Optical fiber communication control system of static var generator

Info

Publication number: CN216699515U
Application number: CN202122705229.3U
Authority: CN
Inventors: 王鹏博; 彭国平; 史奔; 白代兵; 王耀飞; 徐元龙
Original assignee: Guangdong Anpu Electric Power Technology Co ltd
Current assignee: Guangdong Anpu Electric Power Technology Co ltd
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2022-06-07
Anticipated expiration: 2031-11-05

Abstract

The utility model discloses a static var generator optical fiber communication control system, which comprises: the power modules comprise a first half-duplex optical fiber communication unit, and the first half-duplex optical fiber communication unit is provided with a first receiving and sending port; the controller comprises a second half-duplex optical fiber communication unit which is in one-to-one correspondence with the power modules, the second half-duplex optical fiber communication unit is provided with a second receiving and sending port, and the first receiving and sending port and the second receiving and sending port are connected in one-to-one correspondence through a single optical fiber. Because the first half-duplex optical fiber communication unit and the second half-duplex optical fiber communication unit can bidirectionally transmit signal data on the same optical fiber in a half-duplex communication mode, with the structure, two optical fibers do not need to be arranged between the controller and each power module, the communication requirement can be met only by a single optical fiber, the quantity and the cost of the optical fibers are favorably saved, meanwhile, the quantity of ports connected with the optical fibers can be reduced, and the port layout area of the controller is favorably reduced.

Description

Optical fiber communication control system of static var generator

Technical Field

The utility model relates to the field of power electronics and high-voltage SVG, in particular to an optical fiber communication control system of a static var generator.

Background

With more and more electric equipment in the power grid, the influence of reactive power on the power grid is more and more obvious, the reactive power compensation equipment is adopted to compensate the reactive power of the power grid into an indispensable mode, and the latest reactive power compensation technology is SVG (static var generator) adopting power electronic devices to dynamically compensate the reactive power of the power grid in real time.

The static var generator is composed of a controller, power units, reactors and the like, a power part is composed of a plurality of same power units in a cascade connection mode, and the controller of the static var generator is connected with the power units through optical fibers.

Referring to fig. 1, currently, two optical fibers are generally used for connecting a controller 910 of an SVG and each power unit 920, where one optical fiber is used for sending information required by the power unit 920, such as a control command, a PWM-modulated wave-emitting related signal, and the other optical fiber is used for uploading a state of the power unit 920, such as a dc bus voltage value, a fault state, a temperature, a bypass state, and the like. At present, according to the structure, the number of optical fiber interfaces of the controller 910 of the SVG and the number of optical fibers are twice as large as the number of the power units 920, and for the SVG, more power units 920 are generally arranged, so that the difficulty of laying the optical fibers between the controller 910 of the SVG and the power units 920 is increased, the cost of the optical fibers is increased, and meanwhile, under the trend of requiring the compact structure of a product, the cost of a system is increased and the difficulty of laying the controller is increased.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides an optical fiber communication control system of a static var generator, which can ensure that only a single optical fiber is needed to be connected between a controller and a power module, is beneficial to saving the number and cost of optical fibers and simultaneously reduces the layout area of optical fiber connection ports connected with the controller.

The optical fiber communication control system of the static var generator comprises: the power modules comprise a first half-duplex optical fiber communication unit, and the first half-duplex optical fiber communication unit is provided with a first receiving and sending port; the controller is provided with a second half-duplex optical fiber communication unit in one-to-one correspondence with the power modules, the second half-duplex optical fiber communication unit is provided with a second receiving and sending port, and the first receiving and sending port is connected with the second receiving and sending port in one-to-one correspondence through a single optical fiber.

The optical fiber communication control system of the static var generator provided by the embodiment of the utility model at least has the following beneficial effects: each power module is provided with a first half-duplex optical fiber communication unit, the controller is provided with a second half-duplex optical fiber communication unit in one-to-one correspondence with the first half-duplex optical fiber communication units, a first receiving port of the first half-duplex optical fiber communication unit is connected with a second receiving port of the second half-duplex optical fiber communication unit through a single optical fiber, signal data can be transmitted on the same optical fiber in a two-way mode due to the fact that the first half-duplex optical fiber communication unit and the second half-duplex optical fiber communication unit are in half-duplex communication, and therefore the structure is achieved, two optical fibers do not need to be arranged between the controller and each power module, communication requirements can be met only through the single optical fiber, the quantity and the cost of the optical fibers are saved, meanwhile, the quantity of ports connected with the optical fibers can be reduced, and the layout area of the ports of the controller is reduced.

According to some embodiments of the present invention, the power module further includes a power module control unit, the first half-duplex optical fiber communication unit is provided with a first transmitting end and a first receiving end both connected to the power module control unit, and the second half-duplex optical fiber communication unit is provided with a second transmitting end and a second receiving end both connected to the controller.

According to some embodiments of the utility model, the first half-duplex fiber optic communication unit is provided with a first transmit enable terminal and/or a first receive enable terminal connected with the power control unit, and the second half-duplex fiber optic communication unit is provided with a second transmit enable terminal and/or a second receive enable terminal connected with the controller.

According to some embodiments of the utility model, the power module further comprises a power execution unit, the power module control unit is connected with a control end of the power execution unit, the power execution units in the plurality of power modules are cascaded to form a cascade link, and the cascade link can be connected with an external power grid through an inductor.

According to some embodiments of the present invention, the power execution unit includes four power tube assemblies and a capacitor assembly, the four power tube assemblies are connected to form a full bridge circuit, the full bridge circuit is connected to the capacitor assembly, and the power module control unit is connected to the control terminals of the power tube assemblies.

According to some embodiments of the utility model, the power tube assembly comprises an IGBT, an IGCT or a MOSFET.

According to some embodiments of the utility model, the power module further comprises a bypass unit, the bypass unit being connected to the power execution unit, the power module control unit being connected to a control terminal of the bypass unit.

According to some embodiments of the present invention, the power module further includes a detection unit, the detection unit is respectively connected to the power module control unit and the power execution unit, and the detection unit can detect a voltage value of the capacitor assembly and/or a temperature value of the power module.

According to some embodiments of the utility model, at least three of the power modules are connected to form a first bridge arm, at least three of the power modules are connected to form a second bridge arm, at least three of the power modules are connected to form a third bridge arm, and the first bridge arm, the second bridge arm and the third bridge arm are connected in a star or delta manner;

the bridge arm comprises a first bridge arm, a second bridge arm and a third bridge arm, wherein the first bridge arm is connected with an external power grid through the first inductor, the second bridge arm is connected with the external power grid through the second inductor in series, and the third bridge arm is connected with the external power grid through the third inductor.

According to some embodiments of the utility model, the first hair extension port and the second hair extension port are connected by an optical fiber, and the optical fiber is a glass optical fiber or a plastic optical fiber.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic diagram of an optical fiber communication structure of a conventional static var generator;

FIG. 2 is a schematic structural diagram of one embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a power module according to an embodiment of the present invention;

FIG. 4 is a circuit diagram of a power execution unit and a bypass unit according to one embodiment of the present invention;

FIG. 5 is a schematic diagram of a star connection structure of a first bridge arm, a second bridge arm, and a third bridge arm according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram of a triangular connection structure of a first bridge arm, a second bridge arm and a third bridge arm in another embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, if there are first and second described only for the purpose of distinguishing technical features, it is not understood that relative importance is indicated or implied or that the number of indicated technical features or the precedence of the indicated technical features is implicitly indicated or implied.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

As shown in fig. 2 and 3, the optical fiber communication control system of the static var generator according to the embodiment of the present invention includes: the power module 100 comprises a first half-duplex optical fiber communication unit 110, wherein the first half-duplex optical fiber communication unit 110 is provided with a first receiving and sending port 111; the controller 200 is provided with a second half-duplex optical fiber communication unit 210 corresponding to the power modules 100 one to one, the second half-duplex optical fiber communication unit 210 is provided with a second receiving and sending port 211, and the first receiving and sending port 111 and the second receiving and sending port 211 are connected in one to one correspondence through a single optical fiber.

Each power module 100 is provided with a first half-duplex fiber optic communication unit 110, the controller 200 is provided with second half-duplex fiber optic communication units 210 corresponding to the first half-duplex fiber optic communication units 110 one to one, the first receiving and sending port 111 of the first half-duplex fiber optic communication unit 110 is connected with the second receiving and sending port 211 of the second half-duplex fiber optic communication unit 210 through a single optical fiber, since the first half-duplex optical fiber communication unit 110 and the second half-duplex optical fiber communication unit 210 can transmit signal data on the same optical fiber in two directions by means of half-duplex communication, with this structure, two optical fibers are not required to be arranged between the controller 200 and each power module 100, and only a single optical fiber is required to satisfy the communication requirement, which is beneficial to saving the number and cost of the optical fibers, meanwhile, the number of ports for connecting the controller 200 with optical fibers can be reduced, which is beneficial to reducing the layout area of the ports of the controller 200.

Referring to fig. 2 and 3, in some embodiments of the present invention, the power module 100 further includes a power module control unit 120, the first half-duplex optical fiber communication unit 110 is provided with a first transmitting end and a first receiving end both connected to the power module control unit 120, and the second half-duplex optical fiber communication unit 210 is provided with a second transmitting end and a second receiving end both connected to the controller 200.

The power module control unit 120 can transmit the data signal to the first half-duplex optical fiber communication unit 110 through the first transmitting end for transmission, and the first half-duplex optical fiber communication unit 110 can transmit the received data signal to the power module control unit 120 through the first receiving end. The controller 200 can transmit the data signal to the second half-duplex optical fiber communication unit 210 through the second transmitting end for transmission, and the second half-duplex optical fiber communication unit 210 can transmit the received data signal to the controller 200 through the second signal receiving end.

In some embodiments of the present invention, the first half-duplex fiber optic communication unit 110 is provided with a first transmit enable terminal and/or a first receive enable terminal connected to the power control unit 120, and the second half-duplex fiber optic communication unit 210 is provided with a second transmit enable terminal and/or a second receive enable terminal connected to the controller 200.

The power module control unit 120 controls the levels of the first transmit enable terminal and the first receive enable terminal, so that the first half-duplex fiber optic communication unit 110 can be in a transmit state or a receive state; similarly, the controller 200 controls the levels of the second transmit enable terminal and the second receive enable terminal, so that the second half-duplex fiber communication unit 210 can be in a transmit state or a receive state. By matching the transmission state and the reception state of the first half-duplex optical fiber communication unit 110 and the second half-duplex optical fiber communication unit 210, bidirectional communication can be realized by the same optical fiber.

In some embodiments, when the first half-duplex fiber optic communication unit 110 is provided with only the first transmitting end and the first receiving end, the first half-duplex fiber optic communication unit 110 can be in a transmitting state or a receiving state by controlling the level of the first transmitting end or the first receiving end. Similarly, when the second half-duplex optical fiber communication unit 210 is only provided with the first transmitting end and the first receiving end, the second half-duplex optical fiber communication unit 210 can be in a transmitting state or a receiving state by controlling the level of the second transmitting end or the second receiving end.

In the communication process, when the first half-duplex fiber communication unit 110 is in a sending state, the first half-duplex fiber communication unit 110 acquires signal data from the power module control unit 120 through the first sending end, and after electro-optical conversion, the signal data is transmitted to the second sending-receiving port 211 through the first sending-receiving port 111 in the form of an optical signal through an optical fiber; when the first half-duplex fiber communication unit 110 is in a receiving state, the first half-duplex fiber communication unit 110 obtains an optical signal from the first receiving/sending port 111, and the optical signal is converted by photoelectric conversion and then restored to an electrical signal, and the electrical signal is transmitted to the power module control unit 120 through the first receiving end. Similarly, the working processes of the controller 200 and the second half-duplex optical fiber communication unit 210 are the same as the above processes, and are not described again, so that the first half-duplex optical fiber communication unit 110 and the second half-duplex optical fiber communication unit 210 perform half-duplex communication in a transmission state or a reception state at different time periods, i.e., in a time division multiplexing manner, and can implement data exchange by means of a single optical fiber. In the communication process, data interaction is performed in a mode that the controller 200 is used as a master and the power module control unit 120 is used as a slave.

The first half-duplex optical fiber communication unit 110 and the second half-duplex optical fiber communication unit 120 may be an embodiment including a combination of an optical module, and a CPLD or FPGA. The power module control unit 120 and the controller 200 may be implemented by a single chip, an FPGA, a DSP, a CPLD, or an embedded chip.

Referring to fig. 3 and 4, in some embodiments of the present invention, the power module 100 further includes a power execution unit 130, the power module control unit 120 is connected to a control terminal of the power execution unit 130, and the power execution units 130 in the plurality of power modules 100 are cascaded to form a cascade link, and the cascade link can be connected to an external power grid through an inductor.

The power module control unit 120 controls the power execution units 130 to be turned on or off, and the plurality of power execution units 130 are cascaded to form a cascade link and then are connected to the power grid through an inductor.

Referring to fig. 4, in some embodiments of the present invention, the power execution unit 130 includes four power tube assemblies 131, and the four power tube assemblies 131 are connected to form a full bridge circuit.

The four power tube assemblies 131 are connected to form a full-bridge circuit, the full-bridge circuit is connected with the capacitor assembly 132, and the power module control unit 120 controls the power tube assemblies 131 to be switched on or switched off by receiving an instruction of the controller 200, so that the capacitor assembly 132 is put into a power grid or cut off from the power grid, and the reactive compensation adjustment effect is achieved.

In some embodiments of the present invention, the power tube assembly 131 comprises an IGBT, an IGCT, or a MOSFET.

According to the actual use condition, devices such as IGBT, IGCT or MOSFET can be selected as the power tube assembly so as to meet the use requirement. The power tube component can be a single power tube or a structure formed by connecting a plurality of power tubes in parallel.

Referring to fig. 3 and 4, in some embodiments of the present invention, the power module 100 further includes a bypass unit 140, the bypass unit 140 is connected to the power performing unit 130, and the power module control unit 120 is connected to a control terminal of the bypass unit 140.

When the power execution unit 130 fails, the power module control unit 120 can receive the control signal from the controller 200 to control the bypass unit 140 to bypass the failed power execution unit 130, so as to avoid affecting the remaining normal power execution units 130, which is beneficial to improving reliability.

The bypass unit 140 may be an embodiment including a bypass switch or a power electronic switch, etc.

Referring to fig. 3, in some embodiments of the present invention, the power module 100 further includes a detection unit 150, the detection unit 150 is connected to the power module control unit 120 and the power execution unit 130, and the detection unit 150 is capable of detecting a voltage value and/or an operating temperature value of the capacitor assembly 132.

The detection unit 150 detects information such as a voltage value and a temperature value of the capacitor component 132 in the power execution unit 130 during operation, and feeds the information back to the power module control unit 120, the power module control unit 120 uploads working state information data of the power execution unit 130 to the controller 200 through the first half-duplex optical fiber communication unit 110 and the second half-duplex optical fiber communication unit 210, and the controller 200 collects signals such as a grid voltage, a system current, a compensated side current, a converter chain current, and fault information according to the working state information, and sends a control command, a modulation signal and the like after processing, so as to coordinate and control stable operation of each power execution unit 130.

The detection unit 150 may be an embodiment including a common circuit or device such as a voltage detection circuit, a voltage transformer, a current detection circuit, a current transformer, a temperature sensor, and the like.

Referring to fig. 5 and 6, in some embodiments of the utility model, at least three power modules 100 are connected to form a first leg 300, at least three power modules 100 are connected to form a second leg 400, at least three power modules 100 are connected to form a third leg 500, and the first leg 300, the second leg 400, and the third leg 500 are connected in a star or delta configuration.

The first bridge arm 300, the second bridge arm 400 and the third bridge arm 500 are formed by connecting the power modules 100, can be connected to a common three-phase alternating-current power grid, and can connect the first bridge arm 300, the second bridge arm 400 and the third bridge arm 500 in a star-shaped or triangular structure and then join the star-shaped or triangular structure into the power grid according to actual use requirements so as to meet the requirements in actual application.

Referring to fig. 5 and 6, in some embodiments of the present invention, the present invention further includes a first inductor 310, a second inductor 410, and a third inductor 510, the first leg 300 is connected to the external power grid through the first inductor 310, the second leg 400 is connected to the external power grid through the second inductor 410 in series, and the third leg 500 is connected to the external power grid through the third inductor 510.

The first inductor 310, the second inductor 410 and the third inductor 510 are correspondingly connected to the first bridge arm 300, the second bridge arm 400 and the third bridge arm 500, respectively, so that when the bridge is connected with a power grid, the structure is favorable for regulating and controlling active power and reactive power, filtering current and restraining the magnitude of short-circuit current.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The utility model is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the utility model, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.

Claims

1. Static var generator fiber communication control system, characterized by includes:

the power modules (100) comprise a first half-duplex optical fiber communication unit (110), and the first half-duplex optical fiber communication unit (110) is provided with a first receiving and sending port (111);

the controller (200) is provided with a second half-duplex optical fiber communication unit (210) in one-to-one correspondence with the power modules (100), the second half-duplex optical fiber communication unit (210) is provided with a second receiving and sending port (211), and the first receiving and sending port (111) and the second receiving and sending port (211) are connected through a single optical fiber in one-to-one correspondence.

2. The SVG optical fiber communication control system of claim 1, wherein: the power module (100) further comprises a power module control unit (120), the first half-duplex optical fiber communication unit (110) is provided with a first transmitting end and a first receiving end which are both connected with the power module control unit (120), and the second half-duplex optical fiber communication unit (210) is provided with a second transmitting end and a second receiving end which are both connected with the controller (200).

3. The SVG optical fiber communication control system of claim 2, characterized in that: the first half-duplex optical fiber communication unit (110) is provided with a first transmitting enabling end and/or a first receiving enabling end connected with the power module control unit (120), and the second half-duplex optical fiber communication unit (210) is provided with a second transmitting enabling end and/or a second receiving enabling end connected with the controller (200).

4. A static var generator optical fiber communication control system according to claim 2 or 3, wherein: the power module (100) further comprises a power execution unit (130), the power module control unit (120) is connected with a control end of the power execution unit (130), the power execution units (130) in the plurality of power modules (100) are cascaded to form a cascade link, and the cascade link can be connected with an external power grid through an inductor.

5. The SVG optical fiber communication control system of claim 4, characterized in that: the power execution unit (130) comprises four power tube assemblies (131) and a capacitor assembly (132), the four power tube assemblies (131) are connected to form a full-bridge circuit, the full-bridge circuit is connected with the capacitor assembly (132), and the power module control unit (120) is connected with the control end of each power tube assembly (131).

6. The SVG fiber optic communication control system of claim 5, wherein: the power tube assembly (131) comprises an IGBT, an IGCT or a MOSFET.

7. The SVG optical fiber communication control system of claim 5, characterized in that: the power module (100) further comprises a bypass unit (140), the bypass unit (140) is connected with the power execution unit (130), and the power module control unit (120) is connected with a control end of the bypass unit (140).

8. The SVG optical fiber communication control system of claim 7, characterized in that: the power module (100) further comprises a detection unit (150), the detection unit (150) is respectively connected with the power module control unit (120) and the power execution unit (130), and the detection unit (150) can detect the voltage value of the capacitor assembly (132) and/or the temperature value of the power module (100).

9. The SVG optical fiber communication control system of claim 1, characterized in that: at least three power modules (100) are connected to form a first bridge arm (300), at least three power modules (100) are connected to form a second bridge arm (400), at least three power modules (100) are connected to form a third bridge arm (500), and the first bridge arm (300), the second bridge arm (400) and the third bridge arm (500) are in star connection or triangular connection;

the bridge circuit further comprises a first inductor (310), a second inductor (410) and a third inductor (510), the first bridge arm (300) is connected with an external power grid through the first inductor (310), the second bridge arm (400) is connected in series and is connected with the external power grid through the second inductor (410), and the third bridge arm (500) is connected with the external power grid through the third inductor (510).

10. The SVG optical fiber communication control system of claim 1, characterized in that: the first receiving and sending port (111) is connected with the second receiving and sending port (211) through optical fibers, and the optical fibers are glass optical fibers or plastic optical fibers.