CN113972621A - Protection measurement and control system of alternating current filter bank of high-voltage direct current converter station - Google Patents
Protection measurement and control system of alternating current filter bank of high-voltage direct current converter station Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
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Abstract
The invention discloses a protection measurement and control system of an alternating current filter bank of a high-voltage direct current converter station, which comprises: the local intelligent I/O unit is used for carrying out digital sampling and digital tripping control on the tested equipment according to the IEC61850 standard; and the protection and test integrated unit is communicated with the local intelligent I/O unit and is used for protecting and controlling the tested equipment. The protection, measurement and control system of the alternating current filter bank of the high-voltage direct current converter station provided by the invention realizes digital sampling and digital tripping of the alternating current filter bank protection, measurement and control device in the high-voltage direct current converter station, is convenient to realize data sharing and information integration, meets the development requirement of converter station secondary equipment intellectualization, can realize integration of control and protection functions, simplifies equipment wiring, and further reduces operation and maintenance cost.
Description
Technical Field
The invention belongs to the technical field of high-voltage direct-current transmission, and particularly relates to a protection measurement and control system of an alternating-current filter bank of a high-voltage direct-current converter station.
Background
A converter for high voltage direct current transmission is a highly nonlinear harmonic source, and a high voltage direct current transmission system generates abundant harmonics in an alternating current system during operation. Harmonic waves injected into an alternating current power grid can cause harmonic pollution of the power grid, so that the economic benefit of the power grid is reduced, and the safety of equipment such as a generator is damaged. Therefore, in high voltage direct current transmission engineering, the purpose of absorbing harmonic waves is generally achieved by additionally arranging different types of filters on the alternating current side of the converter station.
At present, the control equipment of an alternating current filter bank of a domestic high-voltage direct current converter station is generally configured with a dual measurement and control screen, adopts a dual-host and dual-I/O mode, and substantially belongs to a part of an alternating current station control system. In protection, each AC filter subgroup is generally configured with duplicate protection, each AC filter subgroup is configured with duplicate bus differential protection, and both the control equipment and the protection equipment adopt analog quantity sampling and analog quantity tripping modes. However, other technical routes often exist in foreign engineering, such as requiring the ac field to adopt a digital substation mode, that is, the control equipment and the protection equipment are to implement digital sampling and digital tripping based on the IEC61850 standard. In addition, there is a technical route in which, in order to increase the degree of integration of the devices, the control device and the protection device are integrated, and the reliability of the devices is ensured by a redundant configuration being duplicated. Therefore, the control equipment and the protection equipment in China cannot be in butt joint with the direct current transmission service abroad at present, and the expansion of domestic companies to foreign markets can be limited. In addition, because the existing protection equipment can only adopt analog quantity sampling and cable tripping modes for protection, and the protection device and the control device are required to be separately arranged, the problems of repeated acquisition of equipment information, low intelligent degree, complex field implementation, high maintenance cost and the like can be undoubtedly brought, and the development requirements of commercial control protection products can not be met.
Disclosure of Invention
The invention aims to provide a protection measurement and control system of an alternating current filter bank of a high-voltage direct current converter station, which aims to solve the problems of repeated acquisition of equipment information, low intelligent degree, complex wiring and high operation and maintenance cost when the control and protection equipment of the alternating current filter bank of the high-voltage direct current converter station is applied.
In order to achieve the above object, the present invention provides a protection measurement and control system for an ac filter bank of a high voltage dc converter station, comprising:
the local intelligent I/O unit is used for carrying out digital sampling and digital tripping control on the tested equipment according to the IEC61850 standard;
and the protection and test integrated unit is communicated with the local intelligent I/O unit and is used for protecting and controlling the tested equipment.
Further, preferably, the in-place smart I/O unit includes a first panel and a second panel;
the first panel is provided with an alarm indicator light and a debugging communication port;
the second panel adopts a plug-in structure and is provided with a plurality of board cards.
Further, preferably, the second panel includes:
a first power supply board, a first CPU board, an analog input board, a switching value output board and a first communication board;
the first power supply board is used for providing voltage for the first CPU board, the analog quantity input board, the switching quantity output board and the first communication board;
the analog quantity input board is used for transmitting analog quantity information to the first CPU board, and the switching value input board is used for transmitting input quantity information to the first CPU board;
the first CPU board is used for processing the analog quantity information and the input quantity information and respectively transmitting the processing results to the switching quantity output board and the first communication board.
Further, preferably, the switching value input board is also used for performing 220 or 110V optical coupling isolation on the input value information.
Further, preferably, the first power supply board is further configured to:
the DC voltage of 220V or 110V is converted to provide 24V, 12V or 5V voltage for the first CPU board, the analog input board, the switching output board and the first communication board.
Further, preferably, the integrated unit for testing comprises a third panel and a fourth panel;
the third panel comprises an operation button, a display screen, an alarm indicator light and a debugging communication port;
the fourth panel adopts plug-in components formula structure, still is equipped with a plurality of integrated circuit boards.
Further, preferably, the number of the plurality of boards on the second panel and the fourth panel is expandable.
Further, preferably, the fourth panel includes:
the second power supply board, the second CPU board, the management board, the digital input board, the digital output board and the second communication board;
the second power supply board is used for providing voltage for the second CPU board, the management board, the digital input board, the digital output board and the second communication board;
the digital quantity input board is used for carrying out signal isolation on digital quantity information and respectively transmitting the isolated digital quantity information to the second CPU board and the management board;
the second CPU board and the management board respectively process the isolated digital quantity information and transmit the processing result to the digital quantity output board and the second communication board.
Further, preferably, the second power supply board is further configured to:
and converting the 220V or 110V direct-current voltage to provide 24V, 12V or 5V voltage for the second CPU board, the management board, the digital input board, the digital output board and the second communication board.
Further, preferably, the local intelligent I/O unit and the protection and test integrated unit both use a standard 4U rack chassis.
Compared with the prior art, the invention has the beneficial effects that:
1) the alternating current filter bank protection measurement and control system provided by the invention realizes digital sampling and digital tripping of the alternating current filter bank control protection device in the high-voltage direct current converter station, and fills the technical blank; the sampling and tripping operation are digital, data sharing and information integration can be realized, the development direction of the intelligent converter station secondary equipment is consistent with that of the intelligent converter station secondary equipment, and the development requirements of commercial control protection products can be met;
2) the alternating current filter bank protection measurement and control system provided by the invention realizes the integration of the alternating current filter bank control device and the protection device in the high-voltage direct current converter station. Due to the digitization of the I/O information, the external wiring of the control device and the protection device is greatly simplified, thereby making a control and protection integrated solution feasible. Compared with the prior art, the system has a more compact structure, not only saves the number of screen cabinets, but also saves a large number of cables, thereby reducing the operation and maintenance cost.
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In order to more clearly explain the technical solution of the present invention, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural diagram of a protection measurement and control system of an ac filter bank of a high-voltage dc converter station according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an in-place intelligent I/O unit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a test and protection integrated unit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a protection measurement and control system including a large group of 3 small groups of ac filters according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the invention provides a protection measurement and control system for an ac filter bank of a high voltage dc converter station. As shown in fig. 1, the protection measurement and control system of the ac filter bank of the hvdc converter station includes an in-situ intelligent I/O unit 01 and a protection and measurement integrated unit 02. Wherein the specific functions of these two units are as follows:
and the local intelligent I/O unit 01 is used for carrying out digital sampling and digital trip control on the tested equipment according to the IEC61850 standard.
Specifically, the device under test in this embodiment is generally a primary device, and the in-situ intelligent I/O unit 01 is connected to the primary device through a cable, and digital sampling and digital trip control are implemented based on the IEC61850 standard.
Referring to FIG. 2, in one embodiment, a schematic diagram of an in-place intelligent I/O cell 01 is provided. It should be noted that the local intelligent I/O unit 01 in this embodiment is a standard 4U rack-type chassis, and can be installed in a standard screen cabinet.
Specifically, the in-place smart I/O unit 01 includes a first panel and a second panel;
the first panel is mainly a front panel, and an alarm indicator light and a debugging communication port are arranged on the first panel; the second panel is mainly a back panel, adopts a plug-in structure and is provided with a plurality of board cards.
Further, in a specific embodiment, the second panel includes:
a first power board 011, a first CPU board 012, an analog input board 013, a switching input board 014, a switching output board 015, and a first communication board 016;
the first power board 011 is configured to supply voltages to the first CPU board 012, the analog input board 013, the switching input board 014, the switching output board 015, and the first communication board 016;
the analog input board 013 is configured to transmit analog information to the first CPU board 012, and the switching amount input board 014 is configured to transmit opening amount information to the first CPU board 012;
the first CPU board 012 is configured to process the analog quantity information and the input quantity information, and transmit the processing results to the switching quantity output board 015 and the first communication board 016, respectively.
It should be noted that the number of each board card can be expanded according to actual needs. When the local intelligent I/O unit 01 works, the main working flow is as follows: the current, voltage, and the like are first converted into small voltage signals by the analog input board 013, and the small voltage signals enter the first CPU board 012 and the corresponding management board 023, respectively, and are subjected to filtering and a/D conversion, and then enter the CPU 1. The CPU 1 performs processing of each input amount and transmits the result to the CPU 2. The CPU 2 performs classification and export control of input quantities, and completes event recording and background communication at the same time. The CPLD (complex programmable logic device) is used for data format conversion between the CPU and each I/O board card.
Alternatively, the power supply portion is constituted by a first power supply board 011, which functions to convert 220V or 110V dc into voltages required inside the device, mainly including 24V, 12V, and 5V voltages. The analog quantity conversion section is constituted by a plurality of analog quantity input boards 013, and functions to convert various quantity measurements into small voltage signals.
In one embodiment, the local smart I/O cell 01 has a switching value input function, which is optically isolated via 220/110V optical coupling. Wherein, the switching value output plate 015 completes the control outlet and the signal outlet. The first communication board 016 configures a high-speed ethernet optical port, an electrical port, a 485 serial port, etc. according to the interface requirement.
In one embodiment, the following description is made of the functions that can be implemented by the in-place intelligent I/O unit 01 described in the above embodiments:
(1) the analog quantity acquisition function comprises the acquisition of a large group of alternating current filter string side circuit breaker current, a large group of alternating current filter string circuit breaker current, a large group of alternating current filter bus voltage, a small group of alternating current filter high-voltage side current, a small group of alternating current filter low-voltage side current, a small group of alternating current filter capacitor unbalanced current, a small group of alternating current filter resistor current, a small group of alternating current filter reactor current and a small group of alternating current filter lightning arrester current.
(2) The switching value acquisition function comprises the acquisition of the positions of the circuit breakers at the edge of the large group of alternating current filters, the positions of the circuit breakers in the large group of alternating current filters, the positions of the circuit breakers of the small group of alternating current filters, the positions of the related disconnecting switches and grounding switches, and the fault alarm signals of primary equipment such as the circuit breakers and the disconnecting switches.
(3) Information conversion and uploading function: the local intelligent I/O unit 01 converts input analog quantity sampling into sampling values conforming to IEC 61850-9-2 standard, converts input switching quantity into GOOSE information conforming to IEC61850-8-1 standard, and outputs the GOOSE information to a process layer network through an Ethernet optical port for the AC filter protection and measurement integrated unit 02 to use. In addition, important analog quantity and switching value signals, and action signals and fault signals of the intelligent I/O unit are sent to a converter station computer monitoring system.
(4) Switching value output control function: the local intelligent I/O unit 01 can perform switching on/off operations of devices such as a circuit breaker and a disconnector according to a command received from a network. The device has the functions of a breaker operation box and comprises functions of a switching-on and switching-off circuit, monitoring after switching-on, monitoring an operation power supply, monitoring disconnection of a control circuit and the like.
(5) Data recording, self-diagnosis and alarm of the device, receiving synchronous time-setting signals and the like.
Further, the protection measurement and control system of the ac filter bank of the high voltage dc converter station in the above embodiment further includes a second functional unit, i.e., a protection and measurement integrated unit 02. The protection and test integrated unit 02 is in communication with the local intelligent I/O unit 01 and is used for protecting and controlling tested equipment, including filter differential protection, overcurrent protection, overload protection, unbalance protection and the like. As an optional implementation, the protection and test integrated unit 02 mainly communicates with the local intelligent I/O unit 01 through an SV + GOOSE integrated network, and communicates with the dc control system through a fieldbus.
Referring to fig. 3, in one embodiment, a schematic structural diagram of the integrated test and protection unit 02 is provided. It should be noted that the integrated protection and test unit 02 in this embodiment also adopts a standard 4U rack-type chassis, and can be installed in a standard screen cabinet.
Specifically, the integrated unit 02 for testing includes a third panel and a fourth panel;
the third panel is mainly a front panel, and an operation button, a display screen, an alarm indicator lamp and a debugging communication port are arranged on the third panel; the fourth panel is mainly a back panel, and is the same as the second panel, also adopts plug-in structure, still is equipped with a plurality of integrated circuit boards. It should be noted that the number of the board cards can be expanded according to actual needs.
Further, in a specific embodiment, the fourth panel includes:
a second power board 021, a second CPU board 022, a management board 023, a digital input board 024, a digital output board 025, and a second communication board 026;
the second power board 021 is used for providing voltage for the second CPU board 022, the management board 023, the digital input board 024, the digital output board 025 and the second communication board 026;
the digital input board 024 is configured to perform signal isolation on digital quantity information, and transmit the isolated digital quantity information to the second CPU board 022 and the management board 023, respectively;
the second CPU board 022 and the management board 023 process the isolated digital quantity information, and transmit the processed results to the digital quantity output board 025 and the second communication board 026, respectively.
It should be noted that, when the integrated unit 02 for protection and measurement is in operation, the main workflow is as follows: the information such as current, voltage, breaker position, etc. enters the CPU board and the management board 023 respectively after signal isolation by the digital quantity input board 024. The CPU 1 performs processing of each input amount and transmits the result to the CPU 2. The CPU 2 performs control, protected logic operation and export control, and simultaneously completes event recording, background communication and communication with a human-computer interface. The CPLD is used for data format conversion between the CPU and the external interface. The operation process of the management board 023 is similar to that of the CPU board, and the management board 023 and the CPU board are two completely identical plug-in units, and complete the operation or starting functions of sampling, monitoring and protection. The management board 023 and the CPU board realize a dual redundant structure of a core part of the device, and the reliability of the device is improved.
Alternatively, the power supply part is composed of a second power supply board 021, and functions to convert 220V or 110V dc into a voltage required inside the device, mainly including voltages of 24V, 12V, and 5V. The second communication board 026 is configured with high-speed ethernet optical port, electrical port, 485 serial port, etc. according to the interface requirement.
In a specific embodiment, the following description is made of functions that can be realized by the integrated test and protection unit 02 described in the above embodiment:
(1) adopting a digital interface: the protection and test integrated unit 02 can receive the current/voltage SV sampling values which are in accordance with the IEC61850 standard and come from the on-site intelligent I/O unit 01 and other digital equipment, and GOOSE information such as position information of a circuit breaker/disconnecting switch, interlocking information, control commands and the like, and can output GOOSE tripping commands.
(2) Ac filter protection functions including: the protection circuit comprises a small group alternating current filter differential protection, a small group alternating current filter overcurrent protection, a small group alternating current filter zero sequence overcurrent protection, a small group alternating current filter capacitor unbalance protection, a small group alternating current filter capacitor overload protection, a small group alternating current filter reactor overload protection, a small group alternating current filter resistor overload protection, a small group alternating current filter breaker failure protection, a large group alternating current filter bus differential protection and a large group alternating current filter overvoltage protection.
(3) Ac filter control function: according to the control command of the upper layer of the monitoring system, various control operations such as opening/closing of the circuit breaker, opening/closing of the isolating switch, opening/closing of the grounding switch and the like can be realized. And realizing the interlocking logic of equipment such as a circuit breaker, a disconnecting switch and the like according to the information acquired at the interval and the trans-interval information provided by other intelligent devices.
(4) Fault recording, self-diagnosis and alarm of the device, receiving synchronous time-setting signals and the like.
Referring to fig. 4, in an embodiment, a large ac filter group including 3 small ac filter groups is taken as an example, and the structure of the ac filter group protection measurement and control system is shown in fig. 4. In fig. 4, the first miss, the second group, and the third group are connected in the same manner, and fig. 4 only provides a specific connection structure inside the first group for clarity. As shown in fig. 4, each ac filter bank configures a duplexed in-place smart I/O cell 01. In addition, the protection and test integrated unit 02 duplexed in the ac filter large group configuration.
Further, the local intelligent I/O unit 01 group cabinet is arranged near outdoor primary equipment, and current transformers, circuit breakers, isolating switches and other equipment in the group are connected to the local intelligent I/O unit 01 of the group through cables. The protection and measurement integrated unit 02 group cabinet is arranged indoors. A duplicate process layer network is formed between the local equipment and the indoor equipment through an optical port switch and an optical cable, and SV information and GOOSE information which accord with IEC61850 standards are transmitted.
The protection and measurement integrated unit 02 receives information such as branch current of each group, bus voltage of the filter and the like, and also receives information such as current of a side circuit breaker and a middle circuit breaker on a 500kV alternating current string through a process layer network, so that differential protection of the bus of the large group of the filter can be realized. Besides the process layer a/B network, the protection and measurement integrated unit 02 is also connected to the station control layer a/B network, uploads measurement and control data, and can receive control commands such as packet switching and the like issued by the dc control system.
In summary, the ac filter bank protection measurement and control system provided in the embodiment of the present invention can at least achieve the following functions:
1) the digital sampling and digital tripping control of the alternating current filter bank control protection device in the high-voltage direct current converter station are realized, data sharing and information integration can be realized, the development direction of the intelligent control protection device is consistent with that of secondary equipment of the converter station, and the development requirement of commercial control protection products is met;
2) the integration of the alternating current filter bank control device and the protection device in the high-voltage direct current converter station is realized. Due to the digitization of the I/O information, the external wiring of the control device and the protection device is greatly simplified, thereby making a control and protection integrated solution feasible.
3) The system structure is simplified, the number of the screen cabinets and a large number of cables are saved, and therefore the operation and maintenance cost is reduced.
It should be noted that, in the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and there may be other divisions in actual practice, for example, multiple units or page components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. The utility model provides a protection measurement and control system of high voltage direct current converter station alternating current filter bank which characterized in that includes:
the local intelligent I/O unit is used for carrying out digital sampling and digital tripping control on the tested equipment according to the IEC61850 standard;
and the protection and test integrated unit is communicated with the local intelligent I/O unit and is used for protecting and controlling the tested equipment.
2. The protection, measurement and control system of the high voltage direct current converter station alternating current filter bank according to claim 1, wherein the in-situ intelligent I/O unit comprises a first panel and a second panel;
the first panel is provided with an alarm indicator light and a debugging communication port;
the second panel adopts a plug-in structure and is provided with a plurality of board cards.
3. The protection measurement and control system of the ac filter bank of the hvdc converter station of claim 2, wherein said second panel comprises:
a first power supply board, a first CPU board, an analog input board, a switching value output board and a first communication board;
the first power supply board is used for providing voltage for the first CPU board, the analog quantity input board, the switching quantity output board and the first communication board;
the analog quantity input board is used for transmitting analog quantity information to the first CPU board, and the switching value input board is used for transmitting input quantity information to the first CPU board;
the first CPU board is used for processing the analog quantity information and the input quantity information and respectively transmitting the processing results to the switching quantity output board and the first communication board.
4. The protection measurement and control system for the AC filter bank of the HVDC converter station of claim 3, wherein the switching value input board is further configured to perform 220V or 110V optical coupling isolation on input value information.
5. The system of claim 3, wherein the first power strip is further configured to:
the DC voltage of 220V or 110V is converted to provide 24V, 12V or 5V voltage for the first CPU board, the analog input board, the switching output board and the first communication board.
6. The protection measurement and control system of the high-voltage direct current converter station alternating current filter bank according to claim 2, wherein the protection and measurement integrated unit comprises a third panel and a fourth panel;
the third panel comprises an operation button, a display screen, an alarm indicator light and a debugging communication port;
the fourth panel adopts plug-in components formula structure, still is equipped with a plurality of integrated circuit boards.
7. The system of claim 6, wherein the number of the plurality of boards on the second and fourth panels is scalable.
8. The protection measurement and control system of the high voltage direct current converter station alternating current filter bank according to claim 6, wherein the fourth panel comprises:
the second power supply board, the second CPU board, the management board, the digital input board, the digital output board and the second communication board;
the second power supply board is used for providing voltage for the second CPU board, the management board, the digital input board, the digital output board and the second communication board;
the digital quantity input board is used for carrying out signal isolation on digital quantity information and respectively transmitting the isolated digital quantity information to the second CPU board and the management board;
the second CPU board and the management board respectively process the isolated digital quantity information and transmit the processing result to the digital quantity output board and the second communication board.
9. The system of claim 8, wherein the second power strip is further configured to:
and converting the 220V or 110V direct-current voltage to provide 24V, 12V or 5V voltage for the second CPU board, the management board, the digital input board, the digital output board and the second communication board.
10. The system according to claim 1, wherein the on-site intelligent I/O unit and the protection and measurement integrated unit are standard 4U rack-mounted chassis.
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| CN114552546A (en) * | 2022-03-04 | 2022-05-27 | 广东电网有限责任公司广州供电局 | Cross-station tripping method, system, equipment and medium applied to flexible direct current transmission system |
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