CN218771324U

CN218771324U - Power grid synchronization-based reconstruction and extension station starting on-load test system

Info

Publication number: CN218771324U
Application number: CN202223029383.4U
Authority: CN
Inventors: 朱红滨; 韦敏军; 杨仕雄
Original assignee: Zhejiang Baorui Photoelectric Technology Co ltd
Current assignee: Zhejiang Baorui Photoelectric Technology Co ltd
Priority date: 2022-11-15
Filing date: 2022-11-15
Publication date: 2023-03-28
Anticipated expiration: 2032-11-15

Abstract

The utility model relates to a reconstruction and extension station starting load test system based on power grid synchronization, which comprises a power supply, wherein the power supply is connected with a through-flow device, and the through-flow device is connected with a synchronous sampler through a wireless signal; the through-flow device includes DSP host system, DSP host system connects wireless module respectively, sampling module is trailed to the lock-in, feedback current sampling module, power amplification module and IGBT power module, wireless module wireless connection synchronous sample thief, single-phase voltage reduction module is connected to the power amplification module, single-phase rectification filtering is connected to IGBT power module, and single-phase voltage reduction module and single-phase rectification filtering module all connect power supply, this test system effectively reduces the risk of secondary system incorrect action such as relay protection when rebuilding equipment is put into operation and reduces electric wire netting operation hidden danger, the inspection and the troubleshooting to the power station play convenient and fast's effect, and then reduce engineering start-up process time and improve personnel work efficiency by a wide margin.

Description

Power grid synchronization-based reconstruction and extension station starting on-load test system

Technical Field

The utility model relates to a load test system technical field especially relates to a rebuild extension station starts load test system based on electric wire netting is synchronous.

Background

The work of a load test before the relay protection is started is an important creative measure for improving the quality and the efficiency of a power grid and creating a modern dispatching system of a provincial demonstration area of a novel power system of Zhejiang by applying a new vector inspection technology to promote the quality and the efficiency of the power grid in the relay protection work meeting spirit of the national grid and Zhejiang power supply network company.

With the rapid development of strong smart grid construction in China, the operation scale of the smart substation is rapidly increased in recent years, and the subsequent reconstruction and extension projects are inevitable. Because the intelligent substation does not have a visible secondary circuit as a traditional substation, when the intelligent substation is used for reconstructing and extending a line, a main transformer and the like, the protection device, the merging unit and the intelligent terminal information of the interval need to be considered to be accessed into the protection device. Compared with the traditional transformer substation, the intelligent transformer substation reconstruction and extension interval secondary circuit is associated with the virtual terminal of the model file by converting the intuitive circuit wiring into the virtual terminal of the model file, namely the virtual circuit, the circuit has the characteristic of no electrical disconnection point or connection point, and the correctness of the virtual secondary circuit cannot be determined by the modes of 'quantity on-off' or 'quantity potential' of a universal meter and the like.

Therefore, when the intelligent substation rebuilds the extension interval, traditional relay protection equipment load test debugging mode can not satisfy the new smart grid construction needs to 220kV circuit of 500 kV intelligent substation extension as an example, all in the past when the engineering was put into operation, could arrange relay protection equipment such as bus protection, circuit differential protection to carry out load test, often had a great deal of problem, as follows respectively: firstly, the load is small even no load when the extension line is put into operation, and the problems of small amplitude of the current secondary side, easy interference, difficult phase measurement and verification and the like exist; secondly, the reliability of the virtual circuit needs to be verified by primary equipment and secondary equipment at intervals of the wheel-off operation, a large amount of human resources need to be consumed, and high operation risk is realized; thirdly, the non-all-phase operation state is difficult to realize under the conventional condition, and the loop and polarity correctness of the neutral point zero sequence transformer are difficult to verify; and fourthly, if the wiring of the primary and secondary circuits has problems in the test process, the protection device is misoperated or refused to operate, the starting and operation risk time is prolonged, and the risks such as damage to electrical equipment and personal injury are possibly caused. Therefore, research and innovation are needed for the on-load test scheme before the reconstruction and extension interval of the intelligent substation is started.

SUMMERY OF THE UTILITY MODEL

The utility model aims at prior art's weak point, through frequency and the phase place of gathering operation generating line PT (voltage transformer) secondary side voltage, through wireless synchronization technology, transmit electric wire netting synchronizing signal to supporting through-flow device once with wireless mode, solve the phase measurement and verify the difficulty, the high unable non-full phase running state that realizes of operation risk level, the high technical problem of danger coefficient.

In order to achieve the above object, the utility model provides a following technical scheme:

a reconstruction and extension station starting on-load test system based on power grid synchronization comprises a power supply, wherein the power supply is connected with a through-flow device, and the through-flow device is connected with a synchronous sampler through a wireless signal;

the device comprises a through-flow device and a power supply, wherein the through-flow device comprises a DSP main control module, the DSP main control module is respectively connected with a wireless module, a phase-locked tracking sampling module, a feedback current sampling module, a power amplification module and an IGBT power module, the wireless module is wirelessly connected with a synchronous sampler, the power amplification module is connected with a single-phase voltage reduction module, the IGBT power module is connected with a single-phase rectification filter, and the single-phase voltage reduction module and the single-phase rectification filter module are both connected with the power supply.

Preferably, the DSP main control module is connected to the wireless module through an interactive control signal.

Preferably, the wireless module is connected with the phase-locked tracking sampling module through a wireless synchronous signal, and the wireless module is connected with the synchronous sampler through a wireless signal.

Preferably, the DSP main control module is connected to the power amplification module through a voltage control signal.

Preferably, the DSP main control module is connected to the IGBT power module through a current control signal.

Preferably, the feedback current sampling module and the phase-locked tracking sampling module both transmit signals to the DSP main control module.

The utility model has the advantages that:

(1) The utility model discloses in through frequency and the phase place of gathering operation generating line PT (voltage transformer) secondary side voltage, through wireless synchronization technology, transmit electric wire netting synchronizing signal to supporting through-flow device once with wireless mode, make its output current and gather generating line PT secondary side voltage with the frequency to the realization uses generating line PT secondary side voltage as the phase reference, and the heavy current of once side can move 360 in a phase, satisfies the amplitude phase place demand of band load test before rebuilding interval start.

(2) The utility model discloses in through in new interval or reform transform the interval and insert the back, to load verification before relay protection devices such as bus protection, circuit differential protection start, the risk of secondary system incorrect action such as relay protection when can effectively reduce equipment and put into operation and reduce electric wire netting operation hidden danger, inspection and troubleshooting to the power station play convenient and fast's effect more, and then reduce engineering start-up process time and improve personnel work efficiency by a wide margin, the essential safety demand of electric wire netting operation risk "length when shortening" has been realized.

To sum up, this test system has factor of safety height, can effectively improve personnel work efficiency's advantage, is particularly useful for the area load test system technology field.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is the schematic view of the overall system flow structure of the present invention.

Fig. 2 is a schematic diagram of the structure of the internal module of the through-flow device of the present invention.

Fig. 3 is a schematic diagram of the structure of the internal modules of the whole system.

Detailed Description

The technical solution in the embodiment of the present invention is clearly and completely described below with reference to the accompanying drawings.

Example one

As shown in fig. 1 to 3, the utility model provides a reconstruction and extension station start-up load test system based on power grid synchronization, which comprises a power supply, wherein the power supply is connected with a through-flow device, and the through-flow device is connected with a synchronous sampler through a wireless signal;

Furthermore, the DSP main control module is connected with the wireless module through an interaction control signal, the wireless module receives a synchronous wireless signal and transmits the synchronous wireless signal to the DSP main control module, and the DSP main control module feeds back information to the wireless module to realize wireless interaction.

Furthermore, the wireless module is connected with the phase-locked tracking sampling module through a wireless synchronous signal, receives the wireless synchronous signal from the synchronous sampler, transmits the signal to the DSP main control module and the phase-locked tracking sampling module, so that the DSP main control module and the phase-locked tracking sampling module realize synchronization, and the power grid synchronous phase-locking technology is used for acquiring the frequency and the phase of the secondary side voltage of the operation bus PT and ensuring the safety and the stability of the measurement process.

Furthermore, the DSP main control module is connected with the power amplification module through a voltage control signal, and the power amplification module is used for secondary voltage output.

Furthermore, the DSP main control module is connected with the IGBT power module through a current control signal, and the IGBT power module is used for controlling current output.

Furthermore, the feedback current sampling module and the phase-locked tracking sampling module transmit signals to the DSP main control module, and the wireless synchronization technology is used for transmitting power grid synchronization signals to the through-flow device in a wireless mode, so that the output current of the through-flow device and the voltage of the secondary side of the collection bus PT have the same frequency, and the operation safety during the test is ensured.

The working process is as follows: firstly, acquiring the frequency and the phase of a PT secondary phase voltage of an operating bus; secondly, a power grid synchronous signal is wirelessly transmitted to a through-flow device through a wireless synchronization technology, so that the output current of the through-flow device has the same frequency as the secondary side voltage of a collection bus PT; thirdly, controlling the full-digital primary through-flow equipment to output three-phase large current with settable amplitude phases, and applying the three-phase large current to a primary equipment system with reconstruction and expansion intervals; finally, according to a load test scheme and safety measures before starting of the standardized reconstruction and extension station, carrying out load verification before starting on relay protection devices such as bus protection and line differential protection at the reconstruction and extension interval;

the method comprises the steps of standardizing an on-load test scheme and safety measures before starting of reconstruction and extension intervals, constructing an on-load test template before starting of an intelligent substation reconstruction and extension project, and performing comprehensive verification and safety operation on the substation when the on-load test before starting of the reconstruction and extension project is performed, so that the possible problems of missing detection and safety are avoided;

it is worth explaining that the whole test system can effectively reduce the risk of incorrect actions of secondary systems such as relay protection and the like during equipment commissioning and reduce the potential hazards of power grid operation, and plays a more convenient and rapid role in checking and troubleshooting of a power station, so that the time of a project starting process is greatly shortened, the working efficiency of personnel is improved, and the essential safety requirement of the power grid operation risk during time shortening is met.

In the description of the present invention, it is to be understood that the terms "front and back", "left and right", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or parts referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Of course, in this disclosure, those skilled in the art will understand that the terms "a" and "an" should be interpreted as "at least one" or "one or more," i.e., in one embodiment, a number of an element may be one, and in another embodiment, a number of the element may be plural, and the terms "a" and "an" should not be interpreted as limiting the number.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art in the technical suggestion of the present invention should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a rebuild extension station and start area load test system based on electric wire netting is synchronous which characterized in that: the device comprises a power supply, wherein the power supply is connected with a through-flow device, and the through-flow device is connected with a synchronous sampler through a wireless signal;

2. The system for power grid synchronization-based re-expansion station startup on-load test as claimed in claim 1, wherein the DSP main control module is connected to the wireless module through an interactive control signal.

3. The system of claim 1, wherein the wireless module is connected to the phase-locked tracking sampling module via a wireless synchronization signal, and the wireless module is connected to the synchronous sampler via a wireless signal.

4. The system for power grid synchronization-based plant reconstruction and expansion station startup on-load test as claimed in claim 1, wherein said DSP main control module is connected to the power amplification module through a voltage control signal.

5. The system for power grid synchronization-based reconstruction and extension station startup on-load test as claimed in claim 1, wherein the DSP main control module is connected to the IGBT power module through a current control signal.

6. The system of claim 1, wherein the feedback current sampling module and the phase-locked tracking sampling module both transmit signals to the DSP main control module.