CN111525534A - Automatic tracking compensation device for arc suppression coil - Google Patents

Abstract

The invention designs a new type of automatic tracking compensation device for arc suppression coils. The algorithm adopts the damping resistance of the grounding system of the arc suppression coil to solve the capacitance current; the hardware adopts high-performance control of 4 ARM cores and 8 DSP cores. Through the division and coordination of multiple control cores, it can complete the tedious tasks that traditionally require multiple controllers to complete. The device follows the most comprehensive IEC61850 protocol in the current power system automation field, and has good compatibility and scalability.

Description

An automatic tracking compensation device for arc suppression coil

technical field

The invention belongs to the field of electrical engineering, in particular to an automatic tracking compensation device for an arc suppression coil.

Background technique

Since the 1980s, my country has started the research on the use of arc suppression coils in distribution networks, and developed many arc suppression coil compensation devices, which have achieved certain results in power engineering practice, but there are still two problems that need to be solved urgently: ( 1) Accurate and convenient method for measuring capacitance current; (2) Intelligent development of arc suppression coil compensation device under the background of smart grid.

Aiming at the development key technology of the current arc suppression coil compensation device, this paper will use a single-core high-integration controller that integrates 4 ARM cores and 1 DSP core according to the simple capacitance current measurement method for adjusting the neutral point grounding impedance. A new type of arc suppression coil automatic tracking compensation device is developed, which follows the most comprehensive IEC61850 protocol in the current power system automation field and has good compatibility and scalability.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a kind of automatic tracking compensation device of arc suppression coil, which is realized by the following technical solutions:

In the algorithm of the device, the loop formed by the damping resistance of the arc-extinguishing coil is used to solve the capacitance value, thereby obtaining the capacitance current. The circuit used is in line with the actual situation, without making too many approximate assumptions, and has good accuracy, and complex steps such as adjusting the inductance of the arc suppression coil are not required in the implementation process, and the implementation is simple and convenient.

The hardware adopts the high-performance 66AK2H14 chip as the main controller, and develops a new type of automatic tracking compensation device for arc suppression coils. Compared with the general controller, the 66AK2H14 chip has the following outstanding features:

(1) A single core integrates 4 ARM cores and 8 DSP cores. Multiple controllers inside the chip can exchange information efficiently and share peripherals, avoiding the need for too many supporting bands for multiple controllers. disadvantages to come.

(2) Provide comprehensive and flexible Ethernet support. IEC61850 currently uses Ethernet as the communication network, and the automatic tracking and compensation device of the arc suppression coil is used as the intelligent electronic equipment of the bay layer. Multiple modes, such as network integration, have higher requirements on the Ethernet interface.

(3) The 6AK2H14 chip integrates two Ethernet communication interfaces, which are just suitable for the station control layer network and process layer network to be accessed. At the same time, the two Ethernet interfaces provide 5 ports and 3 ports respectively. From the hardware level Meet the number of Ethernet interfaces required.

Description of drawings

FIG. 1 is a structural design diagram of the automatic tracking compensation device for the arc suppression coil.

Detailed ways

The present invention provides an automatic tracking compensation device for an arc suppression coil. The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

Figure 1 is the structural design diagram of the automatic tracking compensation device for the arc suppression coil. 66AK2H14 integrates 4 ARM cores and 8 DSP cores inside, making full use of the ARM core's expertise in transaction management and DSP's expertise in calculation analysis. ARM can easily transplant Linux and other operating systems, mainly to meet the diversification of device functions; and DSP realizes the functions of real-time operation and calculation of the device, mainly to meet the real-time function of the device.

Combined with the functions required by the automatic tracking and compensation device of the arc suppression coil, the tasks of each control core are reasonably allocated, as shown in Figure 1 (the shaded part is the existing function of the 66AK2H14 chip), the main tasks of each control core and energy supply as described below.

As the main controller of the entire arc suppression coil automatic tracking compensation device, ARM1 is responsible for the overall function management of the device and the function coordination of each control core.

ARM2 is specially responsible for the framing of IEC61850 sending messages and the parsing of IEC61850 sending messages. Considering that the IEC61850 message adopts object-oriented technology and uses asn.1 for parsing, the implementation is more complicated. The third-party MMS-LITE software provides the development framework of IEC61850, which has become one of the current mainstream development modes of IEC61850. ARM2 performs IEC61850 message processing based on MMS-LITE software to reduce the difficulty of development.

ARM3 specially records the Ethernet message of the device, and gives relevant early warning after analyzing the message. On the one hand, it directly analyzes the traffic characteristics of Ethernet packets to warn the network risks of the communication network; .

ARM4 is responsible for man-machine interface management, realizes functions such as parameter configuration through various flexible input methods such as keyboard and touch screen, and realizes the graphical display function of the device through liquid crystal display. For the friendliness of the interface, ARM4 runs on the basis of embedded Linux, and uses GUI technology to display the operation of the automatic tracking and compensation device of the arc suppression coil in a graphical interface.

DSP1 is responsible for the input acquisition of switch quantity and the acquisition of current and voltage. The current and voltage analog quantities coming from CT and PT respectively are read into the device in the form of digital quantities by DSP1 by means of timing interrupt query after signal conditioning circuit and AD conversion. Enter the switch information of the device.

Reducing the time consumption of the algorithm is the key to improving the response speed of the automatic tracking compensation device of the arc suppression coil. Three DSPs from DSP2 to DSP4 are specially used to realize different computing tasks. Among them, DSP2 adopts fast Fourier algorithm to calculate the corresponding fundamental wave value and key characteristic harmonic value of the current and voltage sampling values collected by DSP1. DSP3 is responsible for the calculation of capacitor current.

DSP4 performs arc suppression coil compensation calculation and arc suppression coil control and adjustment functions. For the traditional control method that uses the cable to transmit the output signal, DSP4 directly outputs the control and adjustment output signal to the arc suppression coil after the optocoupler isolation and signal amplification circuit; for IEC61850, the GOOSE message is used to control the adjustment signal output of the arc suppression coil. DSP4 sends the control adjustment results to the ARM2 control core responsible for IEC61850 messages through the internal bus of the chip. After ARM2 organizes the corresponding GOOSE message, the DSP5 responsible for the process layer Ethernet sends the message to the corresponding Ethernet port .

For the application of the arc suppression coil automatic device conforming to IEC61850, DSP5 is responsible for the Ethernet sending and receiving tasks of the process layer, and carries out real-time sending and receiving of SV, GOOSE and IEEE1588 messages at the process layer. When the SV and GOOSE of the process layer are networked separately and a backup network is required, the arc suppression coil automatic device needs up to 4 Ethernet interfaces. Therefore, the process layer interface of the arc suppression coil automatic device adopts the built-in five-port Ethernet module of the 66AK2H14 chip. In order to flexibly adapt to various situations such as SV and GOOSE networking or combined networking in the process layer network. Among them, two Ethernet interfaces are used for the SV network, two Ethernet interfaces are used for the GOOSE network, and one is a spare Ethernet interface for the device.

DSP6 is responsible for the sending and receiving of MMS and other messages in the station control layer network. Since the network situation of the station control layer is relatively simple, the three-port Ethernet module built in the 66AK2H14 chip is used as the Ethernet interface of the station control layer. Among them, two Ethernet The interface is for the MMS network, a spare Ethernet interface for the device.

The IEC61850 processing involved in DSP5 and DSP6 is handed over to ARM2, which is specially responsible for IEC61850 messages, for parsing messages or framing messages.

DSP7 is specially responsible for the security algorithm of the message, and makes full use of the security algorithm hardware engine built in the 66AK2H14 chip to speed up the operation speed of the security algorithm.

DSP8 is responsible for the fault recording, and stores the data generated by the automatic device of the arc suppression coil in the form of COMTRADE, and stores it to the hard disk interface or USB interface provided by the 66AK2H14 chip, and expands the RS485 and RS422 modules to meet the application needs of the power field in special circumstances.

After the automatic tracking compensation device of the arc suppression coil finds that there is a fault in the feeder, it will compensate according to the calculated capacitor current. The invention provides a novel automatic tracking compensation device for arc suppression coils. In the algorithm, the capacitor current is calculated by switching the damping resistance of the grounding system of the arc suppression coil. The method is simple and convenient to realize; 4 ARM cores and 8 DSP cores are used in hardware. The high-performance controller, through the division and coordination of multiple control cores, completes the tedious tasks that traditionally require multiple controllers to complete. And according to the current development trend of power equipment automation, the developed arc suppression coil automatic tracking compensation device is not only compatible with the traditional arc suppression coil compensation device interface, but also can be seamlessly applied to power engineering that follows IEC61850.

Claims (2)

1. an automatic tracking compensation device of arc suppression coil, it is characterized in that: adopt the damping resistance of switching arc suppression coil grounding system to solve capacitive current on device algorithm; Adopt high-performance 66AK2H14 chip as main controller on hardware, device After finding that there is a fault in the feeder, compensation is made according to the calculated capacitor current. 2. The high-current measuring device in a high-voltage transmission line according to claim 1, characterized in that: the main controller has assembled 4 ARM cores and 8 DSP cores, and the ARM can transplant the operating systems such as Linux, satisfying Diversification of device functions; DSP realizes the real-time operation and computing functions of the device, and meets the real-time function of the device.

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