CN201113374Y - Power system microcomputer protection measurement and control device based on double CPU structure - Google Patents

Abstract

The utility model discloses a microcomputer protection, measurement and control device for an electric power system based on a dual-CPU structure. Including DSP processor, sampling circuit, extended RAM circuit, hardware frequency multiplier and phase-locked loop circuit, photoelectric isolation circuit, dual-port RAM circuit, ARM microprocessor, RS232 circuit, keyboard, LCD display, watchdog circuit, clock circuit , Ethernet interface, the DSP digital processor is connected with sampling circuit, extended RAM circuit, hardware frequency multiplication and phase-locked loop circuit, photoelectric isolation circuit, dual-port RAM circuit respectively, and sampling circuit is connected with hardware frequency multiplication and phase-locked loop circuit The ARM microprocessor is connected with the dual-port RAM circuit, the RS232 circuit, the keyboard, the LCD display, the watchdog circuit, the clock circuit and the Ethernet interface respectively. The utility model has the functions of remote control, remote measurement, remote signaling and remote adjustment, etc., and can realize relay protection, measurement and control of the power system.

Description

Power system microcomputer protection measurement and control device based on double CPU structure

technical field

The utility model relates to a microcomputer protection measurement and control device, in particular to a power system microcomputer protection measurement and control device based on a double CPU structure.

Background technique

The safe and stable operation of the power system is the cornerstone of the stable development of the national economy and society. Once natural or man-made faults occur in the power system and cannot be controlled in time, the system will lose stability, cause damage to main equipment, collapse of the power grid, and cause large-scale power outages, which will bring serious consequences to national economic development and people's daily life. In order to ensure the safe and stable operation of the power system, most power systems use microcomputer protection measurement and control devices to monitor and protect substations.

The communication network of the existing microcomputer protection measurement and control devices mostly adopts the field bus method. With the development of science and technology, the field bus used in the communication network of the substation reflects many deficiencies: (1) Openness and flexibility are not strong, and the data transmission speed is slow ,high cost. (2) Different types of fieldbus devices have dedicated communication protocols, which are not compatible with each other, cannot work together, and cannot realize seamless integration of information. (3) Data acquisition, processing, control, forwarding and other tasks are all completed by the communication controller. However, with the improvement of substation intelligence, the amount of information to be transmitted is increasing, and the communication mechanism using the field bus is bound to become an information transmission system. the bottleneck.

At present, there are many manufacturers developing and producing microcomputer protection devices in the domestic market. CPUs generally use DSP or single-chip microcomputers. Most of them form RS-485 network or CAN bus to communicate with substation level. The network topology generally adopts terminal matching bus structure. It does not support star or ring structure network, which makes the reliability of the communication network not high, and cannot adapt to the requirements of the integrated automation technology of industrial Ethernet substations.

Utility model content

In order to solve the above-mentioned technical problems existing in the existing microcomputer protection measurement and control device, the utility model provides a power system microcomputer protection measurement and control device based on a dual-CPU structure. And other functions, can realize the relay protection, measurement and control of the power system.

The technical solution of the utility model for solving the above-mentioned technical problems is: comprising DSP processor, sampling circuit, extended RAM circuit, hardware frequency multiplication and phase-locked loop circuit, photoelectric isolation circuit, dual-port RAM circuit, ARM microprocessor, RS232 circuit, Keyboard, LCD display, watchdog circuit, clock circuit, Ethernet interface, the DSP digital processor is respectively connected with sampling circuit, extended RAM circuit, hardware frequency multiplication and phase-locked loop circuit, photoelectric isolation circuit, dual-port RAM circuit , the sampling circuit is connected to the hardware frequency multiplier and phase-locked loop circuit, the ARM microprocessor is connected to the dual-port RAM circuit, RS232 circuit, keyboard, LCD display, watchdog circuit, clock circuit, and Ethernet interface, and the DSP processor is connected to the The data collected by the sampling circuit is A/D converted, analyzed and calculated, and various protection algorithms are used to make logical judgments, and the output of the logical judgments realizes functions such as alarm and protection, and performs fault recording; the ARM processor realizes the man-machine interface function, Realize keyboard input, liquid crystal display, and communicate with the substation level through the Ethernet interface.

The above-mentioned ARM processor module is Samsung's S3C4510B, which is embedded with ARM's ARM7TDMI processor.

The model of the above-mentioned A/D sampling module is MAX125.

The above liquid crystal display module has a resolution of 320×240.

The beneficial effects of the utility model are:

1) The dual-CPU system can be designed separately according to the function, which simplifies the software design of the system, makes the system have good scalability, better meets the requirements of networking, and improves the overall performance of the system.

2) The TMS320LF2407 DSP chip is used as the data acquisition and processing unit, and the commonly used DSP peripheral circuits are integrated to integrate real-time processing capabilities and controller peripheral functions, thereby improving the accuracy, real-time and stability of the device sex, and have a higher cost performance.

3) The data sampling module adopts two pieces of MAX125 from MAXMIN Company, which makes the collected data more accurate, faster and more data collected at the same time.

4) A liquid crystal display module with a resolution of 320×240 is adopted, which provides an excellent man-machine interface.

5) A keyboard with 7 buttons is provided. The combination of the keyboard and the liquid crystal display module can conveniently display data and waveforms, and at the same time, the control parameters can be modified online.

6) The powerful Ethernet communication function of the ARM processor is used to communicate with the substation level through the Ethernet interface, which fully meets the requirements of the design of the substation integrated automation system based on the IEC61850 system.

7) High-speed data exchange is performed between the DSP and the ARM processor in the device through a dual-port RAM. Utilizing the high-speed data transmission capability of dual-port RAM CY7C026 to transmit data between CPUs has the advantages of high transmission rate, good real-time performance, high reliability, and simple circuit, etc., and can complete a large number of complex data processing tasks, thus taking into account the data transmission processing. High throughput and high speed required.

The present invention will be further described below in conjunction with accompanying drawing.

Description of drawings

Figure 1 is a block diagram of the hardware structure of the power system microcomputer protection measurement and control device based on the dual CPU structure.

Detailed ways

See Figure 1, Figure 1 is a block diagram of the hardware structure of the power system microcomputer protection measurement and control device based on the dual-CPU structure. Ring, photoelectric isolation and other peripheral circuits, RAM processor part also includes peripheral circuits such as keyboard, liquid crystal display, external clock circuit, watchdog circuit, Ethernet communication interface, RS-232 interface and guideline interface, while DSP and RAM processor The two CPUs exchange data through dual-port RAM. The specific implementation steps of the device function are as follows:

1. The voltage and current of the power grid is detected by the acquisition module of this system. After A/D conversion, it is sent to the core chip TMS320LF2407 of this system. The collected data is processed by the DSP controller to obtain the relevant information to be used in the protection algorithm. Parameters, and then carry out logical judgment through various corresponding protection algorithms, and finally output logical results through signal exit and action exit, and perform various signal display and protection actions.

2. The two CPUs, DSP and RAM processor, exchange data through the dual-port RAM chip CY7C026. CY7C026 is a 16K×16 high-speed dual-port static RAM produced by CYPRESS Company, and its access speed is less than 25ns. It has a real dual-port, which can perform data access at the same time. The two ports have independent control signal lines, address lines and data lines. In addition, the storage capacity and data width can be easily expanded through the master/slave selection. The signal through the chip Quantity marker, the left and right ports can realize the sharing of chip resources.

3. The ARM part adopts the μClinux embedded operating system, and the application program is directly written on this system, including the Ethernet communication program, the dual-port RAM read and write program, the key processing program and the liquid crystal display program.

Refer to Figure 2, Figure 2 is a schematic diagram of the human-computer interaction of the microcomputer protection measurement and control device of the power system. The keyboard and LCD provide an excellent human-machine interface, and the control parameters can be modified online while displaying real-time data and waveforms. The man-machine interface is the basis of all software module debugging, intuitively reflects the function of the program, and is the focus of software work.

Claims (4)

1. electric power system microcomputer protecting controller based on dual-cpu structure, it is characterized in that: comprise dsp processor, sample circuit, the expansion RAM circuit, hardware frequency multiplication and phase-locked loop circuit, photoelectric isolating circuit, dual port RAM circuit, the ARM microprocessor, the RS232 circuit, keyboard, LCD display, watchdog circuit, clock circuit, Ethernet interface, described DSP digital processing unit respectively with sample circuit, the expansion RAM circuit, hardware frequency multiplication and phase-locked loop circuit, photoelectric isolating circuit, dual port RAM circuit links to each other, sample circuit links to each other with hardware frequency multiplication and phase-locked loop circuit, the ARM microprocessor respectively with dual port RAM circuit, the RS232 circuit, keyboard, LCD display, watchdog circuit, clock circuit, Ethernet interface links to each other, dsp processor carries out the A/D conversion to the data of sample circuit collection, analytical calculation, utilize various protection algorithms to make logic determines, logic determines is exported, realize reporting to the police, functions such as protection, and carry out failure wave-recording; Arm processor is realized the human interface function, realizes keyboard input, liquid crystal display, and communicates by Ethernet interface and transformer station's inter-stage.

2. electric power system microcomputer protecting controller according to claim 1 is characterized in that: described dsp processor module is made of the TMS320LF2407A chip of Dezhou company.

3. electric power system microcomputer protecting controller according to claim 1 is characterized in that: described arm processor module is the S3C4510B of Samsung.

4. electric power system microcomputer protecting controller according to claim 1 is characterized in that: described A/D acquisition module adopts the MAX125 of MAXMIN company.

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