CN114221439A - Real-time data exchange method and device for power control system - Google Patents
Real-time data exchange method and device for power control system Download PDFInfo
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- H02J13/00034—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving an electric power substation
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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Abstract
The invention discloses a real-time data exchange method and a device of a power control system, wherein memories are respectively established on communication board cards of a power control main station and at least one new energy power station which are arranged in the same area, programmable logic devices on the communication board cards integrate an Ethernet media access control layer and a multicast GOOSE protocol, the memories are filled with application data, one of the main station and the power station is used as a sending end, and the other one of the main station and the power station is used as a receiving end, the method comprises the following steps: receiving first data, wherein the first data is application data in a memory of a sending end sent by the sending end through a multicast GOOSE protocol according to a sending zone bit; mapping the first data to a memory of a receiving end according to a subscription rule, and positioning a receiving zone bit; and the access control layer of the receiving end reads data in the memory of the receiving end in real time according to the interrupt generated by the receiving zone bit. The exchange speed of the power control instructions between the regional power control main station and the scattered regional new energy power generation stations can be greatly improved.
Description
Technical Field
The invention relates to the technical field of new energy, in particular to a real-time data exchange method and a real-time data exchange device for a power control system.
Background
With the improvement of the proportion of electric energy for production and consumption, the role and the position of electric power as basic energy are more and more important, and the electric power production is mainly based on wind/light new energy with strong uncertainty, and a novel electric power system mainly based on the new energy is constructed under the background of 'double carbon', so that the energy safety challenge of each space-time scale is huge. Based on a severe new energy consumption situation, higher requirements are put forward on the safety stability and the balance of the operation of the power system, new challenges are brought to the frequency safety of the power grid, the power grid regulation capacity bottom line is approached, and the new characteristics of the alternating current-direct current hybrid power grid are presented. On the first hand, new energy is consumed to the maximum extent, and the space of a conventional thermal power generating unit with rotary inertia is occupied; in the second aspect, the time sequence fluctuation of the new energy output enables the power balance and the frequency modulation difficulty of the system to be increased continuously; in a third aspect, dc high power blocking poses a serious threat to grid frequency safety.
The capacity of the new energy participating in the primary frequency modulation of the power grid is insufficient, the available quick frequency response resources of the power grid are gradually reduced, the structural dilemma of the frequency control characteristics of the power grid is gradually obvious, a new energy unit is urgently needed to participate in quick frequency response of the power grid, the safety level of the power grid is improved, on one hand, the local frequency modulation of a new energy station needs to be optimized urgently, on the other hand, the impact influence of high-voltage direct current on the frequency and voltage of the regional power grid also needs to be coordinated from the aspect of regional power control, and the quick remote-regulation data exchange is one of the cores of regional power control.
In the related art, the invention patent application with patent application number 201410034898.4 discloses a data exchange method and device for multiple processors, wherein a physical memory of a host is mapped onto a communication bus, the host and at least one slave share the physical memory of the host, processors of the host and each slave access the shared physical memory through the communication bus, the sharing of the physical memory of the host is realized, the slave can freely read and write the shared physical memory, and the essential solution is to solve the problem of communication in equipment.
The invention patent application with the patent application number of 201510845312.7 discloses a one-to-many data transmission system and a method based on satellite links, the method selects a network protocol for data generated by each task load according to the bandwidth of the data generated by each task load and the number of corresponding receiving points, and performs task load network data packing according to the selected network protocol and sends the data to a specified network interface of an airborne network switch; transmitting large bandwidth data by adopting a UDP multicast protocol, and transmitting small bandwidth data by adopting a TCP/IP or UDP point-to-point transmission protocol; and when the UDP multicast protocol data and the point-to-point transmission protocol data exist simultaneously, the virtual network VLAN is divided. The method belongs to the field of ip protocol stacks, and is a point-to-multipoint communication method based on a wireless satellite link, so that the instantaneity is low.
Disclosure of Invention
The technical problem to be solved by the invention is to improve the exchange speed of power control instructions between a regional power control main station and a new energy power generation station in a scattered region.
The invention solves the technical problems through the following technical means:
in a first aspect, an embodiment of the present invention provides a real-time data exchange method for a power control system, where memories are respectively established on communication boards of a power control master station and at least one new energy power station arranged in the same area, a programmable logic device on the communication board integrates an ethernet media access control layer and a multicast GOOSE protocol, the memories are filled with application data, and one of the master station and the power station is used as a sending end and the other is used as a receiving end, where the method includes:
receiving first data, wherein the first data is the application data in the memory of the sending end sent by the sending end according to a sending zone bit through the multicast GOOSE protocol;
mapping the first data to a memory of the receiving end according to a subscription rule, and positioning a receiving zone bit;
and the access control layer of the receiving end reads data in the memory of the receiving end in real time according to the interruption generated by the receiving zone bit.
Due to the fact that a hard refreshing technology is adopted, a traditional communication mode adopting a network protocol stack is modified into a communication mode of an internal high-speed bus, an Ethernet media access control layer and a GOOSE mechanism are arranged in a programmable logic device, processing time of a processor is greatly reduced, exchange speed of power control instructions between a regional power control main station and scattered regional new energy power generation stations is greatly improved, main communication time between the regional power control main station and the regional new energy power generation stations is shortened to transmission time of data on optical fibers, millisecond-level communication technical support is provided for achieving regional new energy group control group regulation, and the fact that the regional new energy power generation stations are aggregated to participate in rapid power regulation and regional transient reactive voltage optimization of a power grid becomes possible.
Further, the method further comprises:
and filling the remote signaling data into the memory by utilizing an internal high-speed bus, wherein the internal high-speed bus is a parallel or serial data communication bus between the CPU and the memory.
Further, the ethernet media access control layer is configured to implement flag bit processing logic and interrupt processing logic;
the multicast GOOSE protocol includes GOOSE transmitting logic and GOOSE receiving logic.
Further, the support capacity of the memory established on the communication board card of the power control master station is an offline configuration option.
Further, when the first data is received by the GOOSE receiving logic, the method further includes:
filtering out-of-band traffic, in-band invalid traffic, and error traffic.
Further, when the power station is used as a receiving end, the maximum time discrete value of the time for receiving the instruction between the power stations is tMaximum dispersion＝tMaximum time delay-tMinimum delayWherein:
tmaximum time delay＝max(tframi+tML+tMSi+tSLi),i＝0,1,2,......,N
tMinimum delay＝min(tframi+tML+tMSi+tSLi),i＝0,1,2,......,N
Wherein, tMLProcessing time, t, inside the local CPU at the master station sideMi(i 0, 1.. said., N) is the optical fiber transmission time of data between the main station and the power generation station, N is the number of power generation stations, tSLi(i ═ 0, 1.. said., N.) is the power plant side local CPU internal processing time.
Further, the maximum time difference of reading the same group of data transmitted by the main station by at least one power station is as follows:
tmaximum dispersion＝tMaximum time delay-tMinimum delay
＝(tM bus+tMS_max+tS bus _ max)-(tM bus+tMS_min+tS bus _ min)
＝(tMS_max-tMS_min)+(tS bus _ max-tS bus _ min)
≈tMS_max-tMS_min
Wherein the memory filling time of the master station side is tM busThe shortest optical fiber transmission time between the main station and the power station is tMS_minThe longest optical fiber transmission time is tMS_maxThe minimum time for reading data by the bus at the power station side is tS bus _ minMaximum time for reading data is tS bus _ max。
In a second aspect, an embodiment of the present invention discloses a real-time data exchange device for a power control system, where the device includes a power control master station and at least one new energy power station that are arranged in the same area, where memories are respectively established on communication boards at the master station and the power station, and a programmable logic device on the communication board integrates an ethernet media access control layer and a multicast GOOSE protocol, where the memories are filled with application data, and when the master station or the power station serves as a receiving end, the device includes:
a receiving module, configured to receive first data, where the first data is the application data in the memory of the sending end sent by the sending end according to the sending flag bit and through the multicast GOOSE protocol;
the mapping module is used for mapping the first data to the memory of the receiving end according to a subscription rule and positioning a receiving zone bit;
and the reading module is used for reading the data in the memory of the receiving end in real time by the access control layer of the receiving end according to the interruption generated by the receiving flag bit.
The invention has the advantages that:
(1) in order to realize the exchange of real-time data between a regional power control main station and a new energy power generation station in the region, the invention adopts a hard memory refreshing technology, physical memory regions are respectively established on communication board cards at two sides of the power control main station and the new energy power generation station which are arranged in the region, an application layer completes application data filling through an internal high-speed bus, an Ethernet media access control layer and a GOOSE mechanism which are integrated in a programmable logic device on the communication board cards, and the programmable logic device completes the real-time data exchange function between the new energy power generation station and the power control main station through a method of reading and writing memory data and organizing link layer transmission. Because the hard refreshing technology is adopted, the traditional communication mode adopting the network protocol stack is modified into the communication mode of the internal high-speed bus, the Ethernet media access control layer and the GOOSE mechanism are arranged in the programmable logic device, so that the processing time of the processor is greatly reduced, thereby greatly improving the exchange speed of power control instructions between the regional power control master station and the scattered regional new energy power generation stations, shortening the main communication time between the regional power control master station and the regional new energy power generation stations into the transmission time of data on optical fibers, solving the problem of remote point-to-multipoint real-time (millisecond-level) data exchange between equipment, adopting an electric power transmission network as a bearing carrier for innovation, providing millisecond-level communication technical support for realizing regional new energy group control group regulation, the method makes it possible for the new energy power station in the region to participate in the rapid frequency modulation of the power grid and the optimization of the transient reactive voltage in the region level.
(2) The network protocol stack is bypassed, real-time (millisecond-level) communication is carried out between the point and the multipoint, wireless signal interference is avoided, and the communication time between the main control rate station and the new energy power generation station in the region is shortened to be about the transmission time of data on the optical fiber.
(3) The time dispersion of the same group of data sent by all the new energy power stations in the area by reading the power control master station is not more than the optical fiber transmission time difference between the longest optical fiber link and the shortest optical fiber link.
Additional aspects and advantages 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
Fig. 1 is a flowchart of a real-time data exchange method of a power control system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a real-time data exchange technique of a power control system according to an embodiment of the present invention;
FIG. 3 is a diagram of conventional point-to-multipoint communication using protocol stacks in the present invention;
fig. 4 is a schematic diagram of point-to-multipoint communication in an internal bus and a multicast GOOSE manner adopted in the first embodiment of the present invention;
fig. 5 is a structural diagram of a real-time data exchange device of a power control system according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all 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.
As shown in fig. 1 to fig. 2, an embodiment of the present invention discloses a real-time data exchange method for a power control system, where memories are respectively established on communication boards of a power control master station and at least one new energy power station arranged in the same area, a programmable logic device on the communication board integrates an ethernet media access control layer and a multicast GOOSE protocol, the memories are filled with application data, and one of the master station and the power station is used as a sending end and the other is used as a receiving end, where the method includes the following steps:
and S10, receiving first data, wherein the first data is the remote signaling data in the memory of the sending end sent by the sending end through the multicast GOOSE protocol according to the sending zone bit.
S20, mapping the first data to the memory of the receiving end according to the subscription rule, and positioning the receiving flag bit.
And S30, the access control layer of the receiving end reads the data in the memory of the receiving end in real time according to the interruption generated by the receiving flag bit.
It should be noted that, in this embodiment, from the perspective of optimizing the communication structure, a node with poor communication time lag is mined, and a virtual logic channel is established between the regional power control master station and the regional new energy field station. By means of the high-speed bandwidth and the transmission rate of the optical fiber, the system has millisecond-level data exchange capacity, and the discreteness of the time for receiving data in a new energy station in an area is small, so that the problem of remote point-to-multipoint real-time (millisecond-level) data exchange between equipment is solved, and the innovation of adopting an electric power transmission network as a bearing carrier is realized. The method provides powerful communication technology support for regional new energy group control group regulation, provides technical reference for regional new energy aggregation to participate in primary frequency modulation and regional voltage regulation of the power grid, and has good application prospect.
In some embodiments, the method further comprises:
and filling the application data into the memory by utilizing an internal high-speed bus, wherein the internal high-speed bus is a parallel or serial data communication bus between the CPU and the memory.
It should be noted that, in the conventional protocol stack manner, the application layer data needs to be encapsulated by the protocol stack in multiple layers before being sent to the link layer, and the time of the data in the process of encapsulating the protocol stack in multiple layers is long. In the embodiment, the direct data exchange between the data layer of the application layer and the data layer of the link layer is realized by using a high-speed bus filling mode, the time of the data outlet of the application layer is shortened, the real-time performance of communication is improved, and the rapid data exchange capability is realized.
It should be noted that the higher the bandwidth of the internal high-speed bus, the shorter the data writing time, so as to reduce the time of data in this link of the communication path.
In some embodiments, the ethernet media access control layer is to implement flag bit processing logic and interrupt processing logic;
the multicast GOOSE protocol includes GOOSE transmitting logic and GOOSE receiving logic.
It should be noted that, (1) at the data sending side, the application layer fills the memory of the programmable logic device through the internal high-speed bus, then writes the sending ready flag (that is, the sending enable bit), and after the programmable logic detects that the sending enable bit is valid, the programmable logic packages the data in the memory into the link layer message to complete sending, and then clears the sending enable bit. (2) The data receiving side analyzes the message content after receiving the external data link layer message, writes the message content into the memory of the programmable logic device, then sets a receiving valid flag (namely receiving enabling is valid) by the programmable logic device, simultaneously generates a hardware interrupt signal, the hardware interrupt signal is accessed to an IO interface of the CPU, and the CPU drives the application layer to read the memory data after monitoring the IO interrupt signal.
It should be noted that, the conventional GOOSE transceiving logic is generally completed in software, but the embodiment is completed in a programmable logic device, and the specific steps are as follows:
(1) GOOSE transmitting logic step: firstly, the CPU writes other description information except the application data into the GOOSE message in the initialization stage, and then enters the GOOSE sending mechanism stage, and secondly, the technology of the GOOSE sending stage is the same as that of the prior art. This embodiment is to shorten the time for encapsulating the GOOSE packet by the CPU application layer, and also to improve the real-time performance.
(2) GOOSE receiving logic step: firstly, an initialization stage CPU writes in subscribed GOOSE descriptors and enters a GOOSE receiving stage, secondly, the GOOSE receiving stage is divided into an in-band flow filtering part, a flow control part and a data mapping part, the in-band flow filtering part and the flow control part are basically the same as the prior art, the difference is that the filtering and the flow control part are completed on a hardware level, the load of the CPU is not increased, the data mapping part is directly mapped into a programmable logic memory, then an interrupt is generated to drive a CPU application layer to obtain memory data, and the prior art is that the CPU analyzes GOOSE messages to strip the application layer data to the application layer. The purpose of this embodiment is to: on one hand, the high operation load rate of the CPU caused by realizing the in-band flow filtration and the flow control is reduced, on the other hand, the time for the CPU to analyze the GOOSE message is shortened, and the real-time performance is also improved.
In some embodiments, the supported capacity of the memory established on the communication board of the power control master station is an offline configuration option.
It should be noted that the physical memory built on the communication board is a memory integrated chip or an internal integrated RAM of a programmable logic device. The physical memory allocation of the regional power control main station side comprises all the new energy power stations in the region, the maximum support capacity is determined by the physical memory size and the CPU operation load rate, and the minimum support capacity is 128 new energy power stations. The physical memory of the new energy power station is only distributed to the memory of a single new energy power station.
In some embodiments, when receiving the first data with the GOOSE receive logic, the method further comprises:
and filtering out-of-band traffic, in-band invalid traffic and error traffic, wherein the heartbeat frequency of the filtering is triggered by a hardware timer.
In some embodiments, when the power station is used as a receiving end, the maximum time discrete value of the command receiving time between the power stations is tMaximum dispersion＝tMaximum time delay-tMinimum delayWherein:
tmaximum time delay＝max(tframi+tML+tMSi+tSLi),i＝0,1,2,......,N
tMinimum delay＝min(tframi+tML+tMSi+tSLi),i＝0,1,2,......,N
Wherein, tMLProcessing time, t, inside the local CPU at the master station sideMi(i 0, 1.. said., N) is the optical fiber transmission time of data between the main station and the power generation station, N is the number of power generation stations, tSLi(i ═ 0, 1.. said., N.) is the power plant side local CPU internal processing time.
The communication time between the local power control master station and the local new energy power generation station is the time from the start of filling data in the application layer on the transmitting side to the end of reading data in the application layer on the receiving side. In a traditional point-to-multipoint transmission mode adopting a protocol stack TCP mode, an application layer needs to organize application messages according to an application protocol, translation of application data and link data is completed through encapsulation and decapsulation of the protocol stack, meanwhile, the application data is transmitted in a serial mode on a CPU side, transmission delay is determined by CPU processor frequency and operating system task scheduling frequency, and uncertainty exists.
As shown in FIG. 3, in the point-to-multipoint transmission scheme using the TCP scheme of the protocol stack, tMLControlling the local CPU internal processing time, t, of the Master station for regional PowerMi(i is 0, 1.... An, N) is the optical fiber transmission time of data between the regional power control master station and the regional new energy power generation stations, N is the number of the regional new energy power generation stations, and t is the number of the regional new energy power generation stationsSLiAnd (i ═ 0, 1.. said., N) is the local CPU internal processing time of the new energy power station side in the region. The minimum delay t from the regional power control master station to the regional new energy power generation stationsMinimum delay＝min(tframi+tML+tMSi+tSLi) 0,1,2Maximum time delay＝max(tframi+tML+tMSi+tSLi) N, and the maximum time discrete value of command receiving time among new energy power generation stations in the region is tMaximum dispersion＝tMaximum time delay-tMinimum delay. The value of the method is related to the number of new energy power stations in the area, the processing performance of a protocol stack and a serial execution mode besides the dispersion of the length of the optical fiber, and is in direct proportion to the number of the new energy power stations in the area, and the larger the number is, the larger the delay is, and the longer the serial execution time is.
As shown in fig. 4, when the internal bus and the multicast goose-mode point-to-multipoint communication method in this embodiment are adopted, the maximum time difference between the reading of the same group of data sent by the master station by at least one of the power stations is:
tmaximum dispersion＝tMaximum time delay-tMinimum delay
＝(tM bus+tMS_max+tS bus _ max)-(tM bus+tMS_min+tS bus _ min)
＝(tMS_max-tMS_min)+(tS bus _ max-tS bus _ min)
≈tMS_max-tMS_min
Wherein the memory filling time of the master station side is tM busThe shortest optical fiber transmission time between the main station and the power station is tMS_minThe longest optical fiber transmission time is tMS_maxThe minimum time for reading data by the bus at the power station side is tS bus _ minMaximum time for reading data is tS bus _ max。
tS bus _ max-tS bus _ minWhen the same bus speed is adopted for reading the time difference of the communication board card bus between the new energy power generation stations, the maximum discrete time is approximate to t because the data length is the same and the time difference is approximate to zeroMS_max-tMS_minThe time dispersion of receiving instructions among new energy power generation stations in the region is greatly shortened due to the difference between the longest optical fiber transmission time and the shortest optical fiber transmission time, real-time (millisecond-level) communication is conducted among point-to-multipoint points through bypassing a network protocol stack, wireless signal interference is avoided, and basic communication support is provided for the group control group regulation technology of the regional new energy fast power system.
As shown in fig. 5, a second embodiment of the present invention discloses a real-time data exchange device for a power control system, where the device includes a power control master station and at least one new energy power station that are arranged in the same area, where memories are respectively established on communication boards at the master station and the power station, and a programmable logic device on the communication board integrates an ethernet media access control layer and a multicast GOOSE protocol, where the memories are filled with application data, and when the master station or the power station serves as a receiving end, the device includes:
a receiving module 10, configured to receive first data, where the first data is the application data in the memory of the sending end sent by the sending end according to the sending flag bit and through the multicast GOOSE protocol;
a mapping module 20, configured to map the first data to the memory of the receiving end according to a subscription rule, and set a receiving flag bit;
and a reading module 30, configured to read, by the access control layer of the receiving end, data in the memory of the receiving end in real time according to the interrupt generated by the receiving flag.
Due to the fact that a hard refreshing technology is adopted, a traditional communication mode adopting a network protocol stack is modified into a communication mode of an internal high-speed bus, an Ethernet media access control layer and a GOOSE mechanism are arranged in a programmable logic device, processing time of a processor is greatly reduced, exchange speed of power control instructions between a regional power control main station and scattered regional new energy power generation stations is greatly improved, main communication time between the regional power control main station and the regional new energy power generation stations is shortened into optical fiber transmission time, millisecond-level communication technical support is provided for achieving regional new energy group control group regulation, and the fact that the regional new energy power generation stations are aggregated to participate in rapid power modulation of a power grid and regional transient state reactive voltage optimization becomes possible.
In some embodiments, the data in the memory is the application data filled into the memory by using an internal high-speed bus, the internal high-speed bus is a parallel or serial data communication bus between the CPU and the memory, and the support capacity of the memory established on the communication board card of the power control master station is an offline configuration option.
In some embodiments, the ethernet media access control layer is to implement flag bit processing logic and interrupt processing logic;
the multicast GOOSE protocol includes GOOSE transmitting logic and GOOSE receiving logic.
In some embodiments, the maximum time difference for at least one of the power stations to read the same set of data transmitted by the primary station is:
tmaximum dispersion＝tMaximum time delay-tMinimum delay
＝(tM bus+tMS_max+tS bus _ max)-(tM bus+tMS_min+tS bus _ min)
＝(tMS_max-tMS_min)+(tS bus _ max-tS bus _ min)
≈tMS_max-tMS_min
Wherein the memory filling time of the master station side is tM busThe shortest optical fiber transmission time between the main station and the power station is tMS_minThe longest optical fiber transmission time is tMS_maxThe minimum time for reading data by the bus at the power station side is tS bus _ minMaximum time for reading data is tS bus _ max。
Due to tS bus _ max-tS bus _ minWhen the same bus speed is adopted for reading the time difference of the communication board card bus between the new energy power generation stations, the maximum discrete time is approximate to t because the data length is the same and the time difference is approximate to zeroMS_max-tMS_minThe time discreteness of receiving instructions between the new energy power generation stations in the region is greatly shortened due to the difference between the longest optical fiber transmission time and the shortest optical fiber transmission time of data, and basic communication support is provided for the group control group regulation technology of the regional new energy fast power system.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. A real-time data exchange method for a power control system is characterized in that memories are respectively established on communication boards of a power control main station and at least one new energy power station which are arranged in the same area, programmable logic devices on the communication boards integrate an Ethernet media access control layer and a multicast GOOSE protocol, the memories are filled with application data, one of the main station and the power station is used as a sending end, and the other one of the main station and the power station is used as a receiving end, the method comprises the following steps:
receiving first data, wherein the first data is the application data in the memory of the sending end sent by the sending end according to a sending zone bit through the multicast GOOSE protocol;
mapping the first data to a memory of the receiving end according to a subscription rule, and positioning a receiving zone bit;
and the access control layer of the receiving end reads data in the memory of the receiving end in real time according to the interruption generated by the receiving zone bit.
2. The power control system real-time data exchange method of claim 1, wherein the method further comprises:
and filling the application data into the memory by utilizing an internal high-speed bus, wherein the internal high-speed bus is a parallel or serial data communication bus between the CPU and the memory.
3. The power control system real-time data switching method of claim 1, wherein the ethernet media access control layer is configured to implement flag bit processing logic and interrupt processing logic;
the multicast GOOSE protocol includes GOOSE transmitting logic and GOOSE receiving logic.
4. The method according to claim 1, wherein the support capacity of the memory established on the communication board of the power control master station is an offline configuration option.
5. The power control system real-time data exchange method of claim 3, wherein in receiving the first data with the GOOSE receive logic, the method further comprises:
filtering out-of-band traffic, in-band invalid traffic, and error traffic.
6. The power control system real-time data exchange method of claim 1, wherein the maximum time difference for at least one power station to read the same group of data transmitted by the main station is:
wherein the memory filling time of the master station side is tM busThe shortest optical fiber transmission time between the main station and the power station is tMS_minThe longest optical fiber transmission time is tMS_maxThe minimum time for reading data by the bus at the power station side is tS bus _ minMaximum time for reading data is tS bus _ max。
7. A real-time data exchange device of a power control system is characterized by comprising a power control main station and at least one new energy power station which are arranged in the same area, wherein memories are respectively established on communication board cards of the main station and the power station, programmable logic devices on the communication board cards integrate an Ethernet media access control layer and a multicast GOOSE protocol, the memories are filled with application data, and the power control system comprises the following components when the main station or the power station is used as a receiving end:
a receiving module, configured to receive first data, where the first data is the application data in the memory of the sending end sent by the sending end according to the sending flag bit and through the multicast GOOSE protocol;
the mapping module is used for mapping the first data to the memory of the receiving end according to a subscription rule and positioning a receiving zone bit;
and the reading module is used for reading the data in the memory of the receiving end in real time by the access control layer of the receiving end according to the interruption generated by the receiving flag bit.
8. The power control system real-time data exchange apparatus of claim 7, wherein the maximum time difference for at least one of the power stations to read the same set of data transmitted by the primary station is:
wherein the memory filling time of the master station side is tM busThe shortest optical fiber transmission time between the main station and the power station is tMS_minThe longest optical fiber transmission time is tMS_maxThe minimum time for reading data by the bus at the power station side is tS bus _ minMaximum time for reading data is tS bus _ max。
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