CN203026925U - Photovoltaic power station low voltage ride through operation compatible type rapid contact line failure isolation device - Google Patents

Photovoltaic power station low voltage ride through operation compatible type rapid contact line failure isolation device Download PDF

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Publication number
CN203026925U
CN203026925U CN 201220474391 CN201220474391U CN203026925U CN 203026925 U CN203026925 U CN 203026925U CN 201220474391 CN201220474391 CN 201220474391 CN 201220474391 U CN201220474391 U CN 201220474391U CN 203026925 U CN203026925 U CN 203026925U
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CN
China
Prior art keywords
protection
low voltage
failure
power station
photovoltaic power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 201220474391
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Chinese (zh)
Inventor
钱庆林
王彦良
徐树锡
陈晓红
朱利峰
刘宗杰
许磊
丁子甲
肖云东
袁冰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Jining Power Supply Co of State Grid Shandong Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Jining Power Supply Co of State Grid Shandong Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, Jining Power Supply Co of State Grid Shandong Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN 201220474391 priority Critical patent/CN203026925U/en
Application granted granted Critical
Publication of CN203026925U publication Critical patent/CN203026925U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model relates to a photovoltaic power station low voltage ride through operation compatible type rapid contact line failure isolation device, and pertains to the field of new energy grid-connected power generation. According to the device, the photovoltaic power station grid-connected distributing substation side is provided with a two section type current protection element and an opposite end straight jumping protection element, wherein the two section type current protection element is used to determine whether a failure is an internal failure according to the measured current value after the failure, and if the failure is an internal failure, then export tripping is performed, and a tripping signal is sent to the photovoltaic power station side protection through the opposite end straight jumping protection element at the same time. The photovoltaic power station side is provided with a low voltage harmonic distortion rate rapid failure starting element and a straight jumping protection element, wherein the low voltage harmonic distortion rate rapid failure starting element is used to determine whether to open the export circuit of the protection device after the failure occurs, and the straight jumping protection element is used to accept the tripping signal sent from the opposite end protection to perform the export tripping. The device of the utility model can be used to realize photovoltaic power station contact line failure rapid detection and isolation to achieve effective compatibility between the photovoltaic power station anti-island protection and the low voltage ride through operation under the premise of effectively ensuring the low voltage ride through requirements of a power system.

Description

A kind of quick fault of interconnected transmission line spacer assembly of compatible photovoltaic plant low voltage crossing operation
Technical field
The utility model belongs to the generation of electricity by new energy field, particularly a kind of quick fault of interconnected transmission line spacer assembly of compatible photovoltaic plant low voltage crossing operation.
Background technology
Photovoltaic generation has that raw material such as not being subjected to coal, oil affect, environmental protection, control mode flexibly, is not subjected to the advantages such as extraneous factor restriction such as traffic, is that the fine of present urban distribution network power supply replenished.But up to the present, being incorporated into the power networks of photovoltaic plant controlled to remain it is considered to a kind of accessory power supply, or even a kind of large load is treated.
But, causing at present, the subject matter of this situation is: 1, traditional grid-connected photovoltaic power station capacity is lower, effect to short circuit current is lower, the ability that after fault, power supply supports also a little less than, traditional fault detection algorithm based on effective value makes the circuit breaker of photovoltaic plant side can't guarantee fast trip, isolates photo-voltaic power supply; 2, grid-connected photovoltaic power station does not possess low voltage ride-through capability or low voltage ride-through capability deficiency; after interconnection or adjacent lines fault; the low voltage crossing characteristic contradiction that the anti-island protect of himself and the requirement of grid-connected system side reach can't realize main body protection and the stable compatibility that ensures of grid-connected system flexibly.
Only have to have solved above two problems, could realize veritably flexible access and the Fault Isolation of photovoltaic plant, the effect that when performance photovoltaic power generation grid-connecting when operation green electric power supply and lonely network operation, Emergency Power supports.Therefore; the utility model proposes a kind of quick fault of interconnected transmission line spacer assembly of compatible photovoltaic plant low voltage crossing operation; effectively guaranteeing under the prerequisite that low voltage crossing requires; realize fast detecting and the isolation of photovoltaic plant fault of interconnected transmission line, reach effective compatibility of anti-island protect and low voltage crossing.
The utility model content
The utility model purpose is in order to overcome the weak point of prior art, has proposed a kind of quick fault of interconnected transmission line spacer assembly of compatible photovoltaic plant low voltage crossing operation, it is characterized in that:
Protection component is directly jumped in photovoltaic electric station grid connection distribution substation side configuration two-part current protection element and opposite end, described two-part current protection element comprises I section current quick element, II section over-current protecting element, two-part current protection element determines whether troubles inside the sample space according to fault after-current measured value, if troubles inside the sample space exports tripping operation, directly jump protection component by the opposite end simultaneously and send trip signal to circuit opposite end protection; The photovoltaic plant side quick fault initiating element of configuration low pressure percent harmonic distortion and the straight protection component of jumping; the also exit circuit of open and protection device occurs in the quick fault initiating element of low pressure percent harmonic distortion failure judgement; the straight protection component of jumping receives the trip signal that the opposite end protection is sent, action outlet tripping operation.
Description of drawings
Fig. 1 is for using the photovoltaic electric station grid connection schematic diagram of the utility model embodiment.
Fig. 2 is for using the photovoltaic electric station grid connection low voltage crossing characteristic schematic diagram of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, the utility model embodiment is described.As shown in Figure 1, photovoltaic plant is incorporated into the power networks by interconnection MN access distribution substation; Interconnection F point breaks down, and needs the quick fault judgement of protection and the isolated fault of interconnection MN both sides.
Protection component is directly jumped in traditional two-part current protection element and the opposite end of configuration by M bus place, line side; The action definite value I of I section current quick wherein I dzAdjust for:
I dz I = K k I · I d . min ( 2 )
K wherein I KBe safety factor, generally get 0.8-0.9; Current amplitude during for line end N bus place's generation two-phase short-circuit fault under system's minimum operational mode.
The time definite value t of I section current quick I dzAdjust and be t I dz=0
The action definite value I of II section overcurrent protection II dzAdjust for:
K wherein II kBe safety factor, generally get 1.2-1.3; I Load.maxMaximum phase current value when normally moving for interconnection MN.
As shown in Figure 1, the II section current quick of M side does not need to coordinate with next stage, so time definite value t II dzAdjust and be t I dz=0.5; Consult low voltage crossing curve shown in Figure 2, M side bus residual voltage corresponding to time-delay was the 0%-20% of rated value in 0.5 second, satisfied the minimum time requirement.
Protection component is directly jumped in the opposite end not to be needed to adjust, and because the F point is troubles inside the sample space, so I section current quick correctly judges outlet tripping operation, directly jumps protection component by the opposite end simultaneously and sends out the jumping signal straight to the straight jumping protection component of N side.
The photovoltaic plant side N bus place quick fault initiating element of configuration low pressure percent harmonic distortion and the straight protection component of jumping; The quick fault initiating element of its mesolow percent harmonic distortion criterion is:
U ph < 85 % U e I &Sigma; n I n > 20 % I 1
U wherein phBe the minimum value in N bus measurement three-phase bus magnitude of voltage; U phSpecified bus phase voltage for N bus place; I nBe the nth harmonic current amplitude, wherein n=1,3,5; I nBe the fundamental current amplitude.
Because the F point is troubles inside the sample space, the fault initiating criterion is true, the exit circuit of open N side protective device; While, the straight protection component of jumping received the trip signal of sending from the opposite end route protection in real time in 1 second, received straight jumping signal and exported fast tripping operation isolation photovoltaic plant.
Effective cooperation of M side and the both sides protection of N side has realized the quick isolation to fault of interconnected transmission line; The requirement of low voltage crossing operation that the operation time limit configuration of simultaneously M side protection is also compatible, the start-up criterion of N side be based on low-voltage and harmonic wave distortion characteristics, and the fault that the meets photovoltaic plant characteristics of exerting oneself have had the sensitivity and the reliability that start concurrently.
Characteristics of the present utility model and technique effect:
The contradiction that the utility model is incorporated into the power networks under abnormal or malfunction at electrical network for photovoltaic plant and exists with main body protection; utility model a kind of quick fault of interconnected transmission line spacer assembly of compatible photovoltaic plant low voltage crossing operation; can guarantee that effectively electric power system is incorporated into the power networks under the prerequisite of low voltage crossing requirement; realize fast detecting and the isolation of photovoltaic plant fault of interconnected transmission line, reached effective compatibility of the anti-island protect of photovoltaic plant and low voltage crossing operation.

Claims (1)

1. the quick fault of interconnected transmission line spacer assembly of a compatible photovoltaic plant low voltage crossing operation, it is characterized in that, protection component is directly jumped in photovoltaic electric station grid connection distribution substation side configuration two-part current protection element and opposite end, described two-part current protection element comprises I section current quick element, II section over-current protecting element, two-part current protection element determines whether troubles inside the sample space according to fault after-current measured value, if troubles inside the sample space exports tripping operation, directly jump protection component by the opposite end simultaneously and send trip signal to circuit opposite end protection; The photovoltaic plant side quick fault initiating element of configuration low pressure percent harmonic distortion and the straight protection component of jumping; the also exit circuit of open and protection device occurs in the quick fault initiating element of low pressure percent harmonic distortion failure judgement; the straight protection component of jumping receives the trip signal that the opposite end protection is sent, action outlet tripping operation.
CN 201220474391 2012-09-18 2012-09-18 Photovoltaic power station low voltage ride through operation compatible type rapid contact line failure isolation device Expired - Fee Related CN203026925U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220474391 CN203026925U (en) 2012-09-18 2012-09-18 Photovoltaic power station low voltage ride through operation compatible type rapid contact line failure isolation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220474391 CN203026925U (en) 2012-09-18 2012-09-18 Photovoltaic power station low voltage ride through operation compatible type rapid contact line failure isolation device

Publications (1)

Publication Number Publication Date
CN203026925U true CN203026925U (en) 2013-06-26

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Application Number Title Priority Date Filing Date
CN 201220474391 Expired - Fee Related CN203026925U (en) 2012-09-18 2012-09-18 Photovoltaic power station low voltage ride through operation compatible type rapid contact line failure isolation device

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CN (1) CN203026925U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108258667A (en) * 2018-02-12 2018-07-06 中国电力科学研究院有限公司 A kind of stage overcurrent protection method of multiterminal flexible direct current system and system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108258667A (en) * 2018-02-12 2018-07-06 中国电力科学研究院有限公司 A kind of stage overcurrent protection method of multiterminal flexible direct current system and system

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130626

Termination date: 20160918

CF01 Termination of patent right due to non-payment of annual fee