CN110784016A

CN110784016A - Automatic fast power regulating device without power outage under power grid open-loop operation mode

Info

Publication number: CN110784016A
Application number: CN201911047008.2A
Authority: CN
Inventors: 郑国军; 施平; 朱豪
Original assignee: Yunnan Hang Association Science And Technology Co Ltd
Current assignee: Yunnan Hang Association Science And Technology Co Ltd
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-02-11

Abstract

The invention provides a non-power-off automatic rapid power-regulating device under a power grid open-loop operation mode, which comprises a CPU and two groups of independent DSP acquisition channels which are mutually connected, wherein one group of DSP acquisition channels obtain accurate voltage and current fundamental wave values through DSP sampling calculation and are used for calculating unbalanced current and voltage, the other group of DSP acquisition channels obtain accurate harmonic current and voltage through DSP sampling calculation to finish the realization of each harmonic monitoring based on the voltage and current channels, the CPU is connected with an Ethernet port and a plurality of serial ports, the Ethernet port is used for connecting a monitoring computer or an RTU (remote terminal unit) to send reports, and the serial ports are used for connecting various configuration hardware. Under the open-loop operation mode, the automatic and rapid power regulation without power failure is realized by the automatic operation of the corresponding switch and the judgment of the related electric quantity data.

Description

Automatic fast power regulating device without power outage under power grid open-loop operation mode

Technical Field

The invention belongs to the technical field of power regulating devices, and particularly relates to a non-power-outage automatic rapid power regulating device in a power grid open-loop operation mode.

Background

After years of construction of Kunming power grids, 500 kV and 220kV electromagnetic looped networks form five relatively independent power supply sections in an open-loop operation mode, and a 110kV transformer substation or line adopts a mode of cross-section sectional operation. The 110kV connecting line has a closed loop operation condition. When the substations belonging to different subareas are subjected to loop closing operation, because the impedance and the current distribution of different paths are different and large differences exist, large phase angle differences exist at two ends of a loop closing switch, and overlarge loop current causes equipment overload and even switch tripping. In order to avoid the situation, the loop closing mode is generally operated by adopting a principle of break before make, which causes a user to power off for a short time and influences the power supply continuity. Frequent power failure not only reduces the power selling amount of the power company, but also greatly reduces the customer satisfaction degree, and even leads to legal disputes.

Disclosure of Invention

The invention aims to provide a non-power-outage automatic rapid power regulating device in a power grid open-loop operation mode, which realizes the non-power-outage automatic rapid power regulation through the automatic operation of a corresponding switch and the judgment of related electric quantity data in the open-loop operation mode.

The invention provides the following technical scheme:

the utility model provides an automatic quick power adjusting device that does not have a power failure under electric wire netting open loop running mode, includes interconnect's CPU and two sets of independent DSP collection passageways, and a set of DSP collection passageway obtains accurate voltage current fundamental wave value by DSP sampling calculation for unbalanced current and voltage's calculation, and another set of DSP collection passageway obtains accurate harmonic current voltage by DSP sampling calculation, accomplishes and realizes each time harmonic monitoring based on voltage current passageway, CPU is connected with ethernet mouth and a plurality of serial ports, and the ethernet mouth is used for connecting supervisory control computer or RTU and sends the report, and the serial ports is used for connecting various configuration hardware.

Preferably, the DSP acquisition channel comprises a first DSP acquisition channel and a second DSP acquisition channel, the first DSP acquisition channel comprises an alternating current acquisition sensor, a preprocessing module, a high-pass filtering module, an AD sampling module and a first DSP, which are connected in sequence, the first DSP is connected to a higher harmonic calculation module and a time management and time synchronization processing module, respectively, the first DSP samples and calculates to obtain an accurate harmonic current voltage, and completes monitoring of each harmonic; the second DSP acquisition channel comprises an alternating current quantity acquisition module, a preprocessing circuit, a low-pass filtering module, an AD converter and a second DSP which are sequentially connected, the second DSP is respectively connected with an alarm logic judgment module, a power-down holding SRAM report storage module and a liquid crystal display module, and the second DSP is used for sampling and calculating to obtain an accurate voltage and current fundamental wave value for calculating unbalanced current and voltage.

Preferably, the first DSP, the second DSP and the CPU are respectively connected to a FlASH storage and SDRAM module for storing detection data, and the second DSP is further connected to a key indicator module.

Preferably, the ethernet port is a 100M ethernet interface, and is connected to the monitoring computer or the RTU in a twisted pair manner or an optical fiber manner, and is used for transmitting a report to the monitoring computer or the RTU.

Preferably, the serial port comprises an RS485 interface and an RS-232 printing interface for connecting a printer and a hard time synchronization device with synchronous clock, the level interface of the serial port conforms to the RS422/485 standard, and the interface receives a second pulse signal or an IRIG-B time synchronization signal sent by the GPS time synchronization device.

The invention has the beneficial effects that: the device realizes automatic and rapid power regulation without power failure by automatically operating corresponding switches and judging related electric quantity data, can adapt to various transformer substations with main wiring, is convenient to install and debug in the transformer substations in operation, and can communicate with a monitoring system; the device can gather and judge required electric quantity, including current-voltage, switch position etc to realize control to the switch, possess powerful operational capability, ensure can real-time calculation, accomplish the quick accent electricity. And the system needs to have communication and a friendly human-computer interface, and is miniaturized and convenient to install.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic diagram of the fast power-on operation of the present invention.

Detailed Description

As shown in figure 1, the uninterrupted automatic fast power regulating device in the open-loop operation mode of the power grid adopts independent double DSPs, and through independent double-channel collection, each channel passes through different isolation transformers and collection circuits and different algorithms, and respectively realizes each harmonic monitoring based on a voltage-current channel and loss tangent value calculation based on voltage-current channel fundamental waves. A group of current and voltage passes through a transformer with high steady-state precision, a filter circuit and an A/D sampling circuit, and accurate voltage and current fundamental wave values are obtained through DSP sampling calculation and are used for calculating unbalanced current and voltage. And the other group of current and voltage passes through a high-precision mutual inductor, a harmonic amplification circuit and an A/D sampling circuit, and accurate harmonic current and voltage are obtained through sampling calculation of a DSP.

Specifically, two high-speed DSPs (DSP1 and DSP2) and corresponding fully independent 16-bit a/D converters, memory and I/O expansion circuits are used for various computing functions of the device, respectively, and the two-part circuits are fully redundant, ensuring reliability of the device. The DSP1 part comprises an alternating current acquisition module, a preprocessing module, a high-pass filtering module, an AD sampling module, a higher harmonic calculation function, a time management function and a time synchronization function, and a processing module of a FlaSH and an SDRAM. The DSP2 part comprises an alternating current collection module, a preprocessing module, a low-pass filtering module, an AD sampling module, a fundamental wave data calculation, alarm judgment, a FlaSH and SDRAM processing module, a power-down holding SRAM report and record storage module, a liquid crystal display module and a key indicator light module.

The management CPU completes the connection with the monitoring computer or RTU, 3 100M Ethernet interfaces for transmitting reports to the monitoring computer or RTU are arranged, and a twisted pair mode or an optical fiber mode can be selected. In addition, 2 RS485 interfaces and 1 RS-232 printing interface are also arranged for connecting the printer. The clock synchronization port is used for hard time synchronization of the device, the level interface of the clock synchronization port accords with RS422/485 standard, and the interface receives a second pulse signal or an IRIG-B time synchronization signal sent by the GPS time synchronization device.

As shown in fig. 1 and 2, the uninterrupted automatic fast power-regulating function in the open-loop operation mode is to complete fast opening and closing operations through programmed opening and closing operations of the circuit breaker, and in the process, whether the operations are successful or not is judged through changes of the position, current and voltage of the related circuit breaker, and if any link in the operation process is in a problem, the device automatically performs reverse switching and restores to the previous state. In the power adjusting process, two modes can be selected, wherein one mode is 'first division and then combination', and the other mode is 'first combination and then division'. These two modes may be determined by the platen and control words prior to operation. The mode of 'first division and then combination' has the advantages that various problems caused by loop closing do not exist, and the defect is that the power failure time is about 1 second in the power adjusting process. The mode of closing first and then separating is adopted, so that all the intermediate processes follow the principle of closing first and then separating, the power loss is avoided, but short-time closed-loop operation exists in the power regulating process, and the load of a power grid can be influenced temporarily.

Under the open-loop operation mode, automatic and rapid power regulation without power outage is realized by automatic operation of corresponding switches and judgment of related electric quantity data. And the device is suitable for various main wiring substations, such as internal bridging wires or line transformer assembling wires or expanded internal bridging wires. The device has elaborate structural design, so that the protection and the measurement and control are relatively independent and are mutually fused, the work of the protection device is not influenced by the measurement and control and external communication, and the safety and the reliability of the protection are ensured. The device adopts a layered distributed structure, can be intensively assembled and also can be arranged on a switch cabinet, the whole system is flexible and reliable, the functions of all the interval units are independent, no interdependence exists, and the damage of one device cannot influence the functions of other devices. The characteristics of four unifications and the advantages of communication network are fully exerted, the protection measurement and control functions are integrated, the communication network is adopted to transmit information, the conventional secondary signal control cable can be eliminated, and the secondary cable wiring is simplified. Not only reduces CT and PT loads, but also saves a large amount of investment, manpower and material resources, and reduces construction difficulty and maintenance workload. Meanwhile, in order to be compatible with the traditional mode, partial telecontrol signals and central signals are reserved, and the traditional mode is also adopted by the backboard terminal, so that the backboard terminal is compatible with the traditional operation control mode. When the power is required to be adjusted, the power restoration speed is high, the power failure time is greatly reduced, and the influence of frequent power failure on the sales volume of a company is avoided. The influence on the asynchronous motor, the synchronous motor and other equipment of the user is greatly reduced, and the influence on the electricity utilization satisfaction degree of the user can be obviously reduced. The device can ensure that the electric work impact is little under the degree open loop mode of operation mode, and safe and reliable prevents that the small power supply non-synchronization that manual transfer electricity probably caused from closing a floodgate and leading to equipment to damage, manual operation when can finely avoiding transferring electricity prevents manual maloperation.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides an automatic quick power adjusting device that does not have a power failure under electric wire netting open loop running mode, its characterized in that includes interconnect's CPU and two sets of independent DSP collection passageways, and a set of DSP collection passageway obtains accurate voltage current fundamental wave value by DSP sampling calculation for unbalanced current and voltage's calculation, and another set of DSP collection passageway obtains accurate harmonic current voltage by DSP sampling calculation, accomplishes and realizes each time harmonic monitoring based on voltage current passageway, CPU is connected with ethernet mouth and a plurality of serial ports, and the ethernet mouth is used for connecting supervisory control computer or RTU and sends the report, and the serial ports is used for connecting various configuration hardware.

2. The device for automatically and rapidly adjusting the power without power outage in an open-loop operation mode of a power grid according to claim 1, wherein the DSP acquisition channel comprises a first DSP acquisition channel and a second DSP acquisition channel, the first DSP acquisition channel comprises an Alternating Current (AC) quantity acquisition sensor, a preprocessing module, a high-pass filtering module, an AD sampling module and a first DSP which are sequentially connected, the first DSP is respectively connected with a higher harmonic calculation module and a time management and time synchronization processing module, and the first DSP samples and calculates to obtain accurate harmonic current and voltage to complete the monitoring of each harmonic; the second DSP acquisition channel comprises an alternating current quantity acquisition module, a preprocessing circuit, a low-pass filtering module, an AD converter and a second DSP which are sequentially connected, the second DSP is respectively connected with an alarm logic judgment module, a power-down holding SRAM report storage module and a liquid crystal display module, and the second DSP is used for sampling and calculating to obtain an accurate voltage and current fundamental wave value for calculating unbalanced current and voltage.

3. The device of claim 2, wherein the first DSP, the second DSP and the CPU are respectively connected with a FlaSH storage and SDRAM module for storing detection data, and the second DSP is further connected with a key indicator module.

4. The device of claim 1, wherein the ethernet port is a 100M ethernet port, and is connected to the monitoring computer or the RTU via twisted pair or optical fiber, and is configured to transmit a report to the monitoring computer or the RTU.

5. The device of claim 1, wherein the serial port includes an RS485 interface and an RS-232 printing interface for connecting a printer and a hard time synchronization of device clock synchronization, and a level interface thereof conforms to RS422/485 standard, and the interface receives a second pulse signal or an IRIG-B time synchronization signal sent by a GPS time synchronization device.