CN106992500A - The bridge arm current over-current protection method and control system of flexible direct current power transmission system - Google Patents

The bridge arm current over-current protection method and control system of flexible direct current power transmission system Download PDF

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Publication number
CN106992500A
CN106992500A CN201710301865.5A CN201710301865A CN106992500A CN 106992500 A CN106992500 A CN 106992500A CN 201710301865 A CN201710301865 A CN 201710301865A CN 106992500 A CN106992500 A CN 106992500A
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CN
China
Prior art keywords
current
bridge arm
power transmission
transmission system
flexible direct
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Pending
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CN201710301865.5A
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Chinese (zh)
Inventor
范雪峰
曹森
郝俊芳
黄金海
吴庆范
付艳
王瑶
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
Xuji Group Co Ltd
XJ Electric Co Ltd
State Grid Shanghai Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Xuji Group Co Ltd
XJ Electric 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.)
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Application filed by State Grid Corp of China SGCC, Xuji Group Co Ltd, XJ Electric Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201710301865.5A priority Critical patent/CN106992500A/en
Publication of CN106992500A publication Critical patent/CN106992500A/en
Priority to PCT/CN2017/113210 priority patent/WO2018201708A1/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)

Abstract

The present invention relates to the bridge arm current over-current protection method and control system of flexible direct current power transmission system, for any one bridge arm, bridge arm current is gathered；Bridge arm current is handled, current effective value and current instantaneous value is obtained；When current effective value is more than the second given threshold more than the first given threshold, and current instantaneous value, protection act.The condition met according to current effective value and instantaneous value carries out excessively stream judgement, when current effective value and instantaneous value are all higher than corresponding given threshold, represents that the actual current of bridge arm occurs in that over-current phenomenon avoidance, then control protection act.So, the guard method process is simple, and involved judgement parameter is less, and protection reliability is higher, correspondingly, judges quick effective.When breaking down, impact of the bridge arm current to each submodule is greatly reduced, and rapidly protects submodule not influenceed by fault current.

Description

The bridge arm current over-current protection method and control system of flexible direct current power transmission system
Technical field
The present invention relates to the bridge arm current over-current protection method and control system of flexible direct current power transmission system.
Background technology
Relative to traditional flexible direct current power transmission system (being based on IGBT serial connection technologies), based on modularization multi-level converter The flexible direct current power transmission system of (modular multilevel converter, MMC) is simple in construction because of its, it is easy to engineering construction The features such as cause the extensive concern of domestic and international experts and scholars in recent years, as shown in Figure 1.The modularization multi-level converter by Six bridge arms of three-phase are constituted, and each bridge arm is by coupling or non-coupled inductance and several identical MMC submodules levels Connection is constituted.Wherein, submodule can be half-bridge submodule, full-bridge submodule and clamp Shuangzi module.Just with half-bridge submodule Exemplified by, each submodule includes two IGBT, two backward diodeds and a DC capacitor.
The characteristics of one important in MMC topological structures has been put into storage capacitor among the submodule of series connection.This brings A series of problem, such as due to the presence of bridge arm current so that capacitance voltage moment of each submodule in change, due to Bridge arm current becomes rapidly big during generation bridgc arm short, maximum is reached after several milliseconds, as shown in Figure 2.How bridge is quickly detected Arm excessively stream and technological difficulties are turned into fault clearance.
At present, conventional bridge arm over-current protection method process is relatively complicated, and overcurrent protection reliability is relatively low.
The content of the invention
It is an object of the invention to provide a kind of bridge arm current over-current protection method of flexible direct current power transmission system, to solve The problem of existing bridge arm current overcurrent protection mode reliability is relatively low.Present invention simultaneously provides a kind of flexible direct current power transmission system Bridge arm current overcurrent protection control system.
To achieve the above object, the solution of the present invention includes a kind of bridge arm current overcurrent protection of flexible direct current power transmission system Method, comprises the following steps：
(1) for any one bridge arm, bridge arm current is gathered；
(2) bridge arm current is handled, obtains current effective value and current instantaneous value；
(3) when the current effective value be more than the first given threshold, and the current instantaneous value be more than the second given threshold When, protection act.
The bridge arm current is decomposed, DC component and AC compounent is obtained, DC component and AC compounent is asked for Root mean square obtain the current effective value.
The calculation formula of the current effective value is：
Wherein, IEffectivelyFor the current effective value, IACIt is AC compounent, IDCFor DC component.
The acquisition formula of the bridge arm current is：
The calculation formula of the current instantaneous value is：
Wherein, Ip is the bridge arm current, and Ip (t) is the current instantaneous value, IDPFor DC bus current, IVCIt is valve Side outlet electric current, a is bridge arm current amplitude.
The calculation formula of the DC component is：
The calculation formula of the AC compounent is：
Wherein, Ip (t) is current instantaneous value, and A is constant.
The solution of the present invention also includes a kind of bridge arm current overcurrent protection control system of flexible direct current power transmission system, bag Include：
Acquisition module, for for any one bridge arm, gathering bridge arm current；
Computing module, for handling the bridge arm current, obtains current effective value and current instantaneous value；
Protection act control module, for being more than the first given threshold when the current effective value, and the electric current is instantaneous When value is more than the second given threshold, protection act.
The bridge arm current is decomposed, DC component and AC compounent is obtained, DC component and AC compounent is asked for Root mean square obtain the current effective value.
The calculation formula of the current effective value is：
Wherein, IEffectivelyFor the current effective value, IACIt is AC compounent, IDCFor DC component.
The acquisition formula of the bridge arm current is：
The calculation formula of the current instantaneous value is：
Wherein, Ip is the bridge arm current, and Ip (t) is the current instantaneous value, IDPFor DC bus current, IVCIt is valve Side outlet electric current, a is bridge arm current amplitude.
The calculation formula of the DC component is：
The calculation formula of the AC compounent is：
Wherein, Ip (t) is current instantaneous value, and A is constant.
In the bridge arm current over-current protection method for the flexible direct current power transmission system that the present invention is provided, to the bridge arm electricity collected Stream is handled, and obtains current effective value and instantaneous value, and excessively stream is carried out according to the condition of current effective value and instantaneous value satisfaction Judge, when current effective value and instantaneous value are all higher than corresponding given threshold, represent that the actual current of bridge arm occurs in that excessively stream Phenomenon, then control protection act, protection exit.So, the guard method process is simple, involved judgement parameter compared with Few, protection reliability is higher, correspondingly, judges quick effective.When breaking down, impact of the bridge arm current to each submodule is big It is big to reduce, rapidly protect submodule not influenceed by fault current.
Brief description of the drawings
Fig. 1 is MMC Basic Topological figures；
Fig. 2 is development trend schematic diagram of the bridge arm current in bridgc arm short；
Fig. 3 is the topological structure schematic diagram that is applicable of bridge arm current over-current protection method of flexible direct current power transmission system；
Fig. 4 is the method logical schematic that virtual value is calculated according to AC compounent and DC component；
Fig. 5 is bridge arm current protection exit logic chart.
Embodiment
The bridge arm current over-current protection method embodiment of flexible direct current power transmission system
As shown in figure 3, being that the bridge arm current over-current protection method of flexible direct current power transmission system that the present invention is provided is applicable Topological structure schematic diagram, for the structure is just for wherein one bridge arm, therefore, this method is inherently suitable for use in Fig. 1 institutes The MMC structures shown, are further applicable to symmetrical pseudo- dipolar configuration.
The electric current on each bridge arm in MMC, the electric current on DC line and upper and lower bridge arm current direction are as shown in Figure 1. Bridge arm current is Ip_j and In_j, wherein j=a, b, c, and abc three-phases are represented respectively；P represents bridge arm, and n represents lower bridge arm.That , the bridge arm current of bridge arm is that the bridge arm current of bridge arm under Ip_a, a phases is In_b in a phases；The bridge arm current of bridge arm is in b phases The bridge arm current of bridge arm is In_b under Ip_b, b phase；The bridge arm current of bridge arm is the bridge arm current of bridge arm under Ip_c, c phases in c phases For In_c.
The first step of the bridge arm current over-current protection method for the flexible direct current power transmission system that the present invention is provided is exactly to gather bridge Arm electric current.In addition, in order to implement to have in the guard method, transmission system corresponding hardware device, such as current detecting is set Standby, control device and protection equipment.Current detecting equipment is provided with each bridge arm.Because these equipment belong to conventional skill Art, is just no longer described in detail here.Because the implementation process of the over-current protection method of each bridge arm is identical, then, below with Illustrated exemplified by one of bridge arm.
So, the bridge arm current of the bridge arm is gathered using current detecting equipment.
Then, current detecting equipment will detect that obtained bridge arm current is transferred in control device, and control device is to bridge arm Electric current is handled and analyzed, and is：Bridge arm current is handled, current effective value and current instantaneous value is obtained.
Wherein, current instantaneous value can be asked for according to the mode of asking in existing, and the present embodiment provides following one kind Embodiment：
First, the acquisition formula of bridge arm current is：
Then, current instantaneous value is obtained according to bridge arm current, calculation formula is：
Wherein, Ip is bridge arm current, and Ip (t) is current instantaneous value, IDPFor DC bus current, IVCIt is valve side outlet electricity Stream, a is bridge arm current amplitude.
The present embodiment provides a kind of computational methods of current effective value, is specially：Resolution process is carried out to bridge arm current, obtained To the DC component and AC compounent of electric current.Also, obtain the DC component of electric current using following two calculation formula and exchange Component.
The calculation formula of DC component is：
The calculation formula of AC compounent is：
Wherein, A is constant, is set according to actual requirement, such as 1488.
SIN function in a cycle is summed, itself and for 0；It is n*A to a DC quantity a cycle summation, so right Bridge arm current calculates n*A/n after average value and is only left DC component, you can to extract its DC component.This decomposition method is fast It is fast, simple, effective, without with links such as LPFs.
Then, according to DC component and AC compounent calculating current virtual value, as shown in figure 4, calculation is：Ask for straight The root mean square of flow component and AC compounent, obtained root-mean-square value is exactly current effective value IEffectively.Calculation formula is：
Wherein, IACIt is the AC compounent of bridge arm current, IDCFor the DC component of bridge arm current.
Finally, control device makes the judgement of protection act according to obtained current effective value and instantaneous value：When electric current has When valid value is more than the second given threshold more than the first given threshold, and current instantaneous value, protection act.Wherein, the first setting threshold Value and the second given threshold can need to be set according to actual control.
By taking the upper bridge arm of abc three-phases as an example, relay protective scheme judges as shown in Figure 5.For example：Work as Ip_a_EffectivelyMore than setting threshold It is worth Δ 1, and Ip_a_InstantaneouslyMore than given threshold Δ 2, then, bridge arm excessively stream, protection act in a phases.
In addition, the collection period by reducing bridge arm current, can be further ensured that the rapidity of subsequent action.
The bridge arm current overcurrent protection control system embodiment of flexible direct current power transmission system
In the present embodiment, control system includes three modules, is respectively：
Acquisition module, for for any one bridge arm, gathering bridge arm current；
Computing module, for handling bridge arm current, obtains current effective value and current instantaneous value；
Protection act control module, for being more than the first given threshold when current effective value, and current instantaneous value is more than the During two given thresholds, protection act.
So, three modules of the control system are functional block, wherein, acquisition module can be hardware module, and other two Individual module realizes corresponding function by being carried in control device, then, the protection domain of the overcurrent protection control system is Over-current protection method.Described in detail due to being made that to this method in above method embodiment, it is just no longer specific here Explanation.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.The base of the present invention This thinking is the bridge arm current over-current protection method of flexible direct current power transmission system, for it is each realize step implement means Do not limit, without departing from the principles and spirit of the present invention to embodiment carry out change, modification, replacement and Modification is still fallen within protection scope of the present invention.

Claims (10)

1. the bridge arm current over-current protection method of a kind of flexible direct current power transmission system, it is characterised in that comprise the following steps：
(1) for any one bridge arm, bridge arm current is gathered；
(2) bridge arm current is handled, obtains current effective value and current instantaneous value；
(3) when the current effective value is more than the second given threshold more than the first given threshold, and the current instantaneous value, protect Shield is acted.
2. the bridge arm current over-current protection method of flexible direct current power transmission system according to claim 1, it is characterised in that will The bridge arm current is decomposed, and obtains DC component and AC compounent, and the root mean square for asking for DC component and AC compounent is obtained To the current effective value.
3. the bridge arm current over-current protection method of flexible direct current power transmission system according to claim 2, it is characterised in that institute The calculation formula for stating current effective value is：
Wherein, IEffectivelyFor the current effective value, IACIt is AC compounent, IDCFor DC component.
4. the bridge arm current over-current protection method of flexible direct current power transmission system according to claim 2, it is characterised in that institute The acquisition formula for stating bridge arm current is：
I p = I D P 3 + I V C 2
The calculation formula of the current instantaneous value is：
I p ( t ) = 1 3 I D P + 1 2 a sin ( ω t + θ ) ,
Wherein, Ip is the bridge arm current, and Ip (t) is the current instantaneous value, IDPFor DC bus current, IVCIt is valve side outlet Electric current, a is bridge arm current amplitude.
5. the bridge arm current over-current protection method of the flexible direct current power transmission system according to Claims 2 or 3 or 4, its feature It is, the calculation formula of the DC component is：
I D C = 1 t * ∫ 0 t [ I p ( t ) * d θ + A ]
The calculation formula of the AC compounent is：
I A C = Σ n = 1 1 ( a n c o s π x + b n s i n π x ) ,
Wherein, Ip (t) is current instantaneous value, and A is constant.
6. a kind of bridge arm current overcurrent protection control system of flexible direct current power transmission system, it is characterised in that including：
Acquisition module, for for any one bridge arm, gathering bridge arm current；
Computing module, for handling the bridge arm current, obtains current effective value and current instantaneous value；
Protection act control module, for being more than the first given threshold when the current effective value, and the current instantaneous value is big When the second given threshold, protection act.
7. the bridge arm current overcurrent protection control system of flexible direct current power transmission system according to claim 6, its feature exists In the bridge arm current is decomposed, DC component and AC compounent is obtained, the square of DC component and AC compounent is asked for Root obtains the current effective value.
8. the bridge arm current overcurrent protection control system of flexible direct current power transmission system according to claim 7, its feature exists In the calculation formula of the current effective value is：
Wherein, IEffectivelyFor the current effective value, IACIt is AC compounent, IDCFor DC component.
9. the bridge arm current overcurrent protection control system of flexible direct current power transmission system according to claim 7, its feature exists In the acquisition formula of the bridge arm current is：
I p = I D P 3 + I V C 2
The calculation formula of the current instantaneous value is：
I p ( t ) = 1 3 I D P + 1 2 a sin ( ω t + θ ) ,
Wherein, Ip is the bridge arm current, and Ip (t) is the current instantaneous value, IDPFor DC bus current, IVCIt is valve side outlet Electric current, a is bridge arm current amplitude.
10. the bridge arm current overcurrent protection control system of the flexible direct current power transmission system according to claim 7 or 8 or 9, its It is characterised by, the calculation formula of the DC component is：
I D C = 1 t * ∫ 0 t [ I p ( t ) * d θ + A ]
The calculation formula of the AC compounent is：
I A C = Σ n = 1 1 ( a n c o s π x + b n s i n π x ) ,
Wherein, Ip (t) is current instantaneous value, and A is constant.
CN201710301865.5A 2017-05-02 2017-05-02 The bridge arm current over-current protection method and control system of flexible direct current power transmission system Pending CN106992500A (en)

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PCT/CN2017/113210 WO2018201708A1 (en) 2017-05-02 2017-11-27 Overcurrent protection method, control system and storage medium for bridge arm current

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CN107769173A (en) * 2017-11-13 2018-03-06 广东电网有限责任公司电力调度控制中心 A kind of definite value choosing method of flexible direct current power transmission system bridge arm overcurrent protection
WO2018201708A1 (en) * 2017-05-02 2018-11-08 许继集团有限公司 Overcurrent protection method, control system and storage medium for bridge arm current
CN112003244A (en) * 2020-07-31 2020-11-27 深圳市禾望电气股份有限公司 Fault pre-judging method and system for power module

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CN107769173A (en) * 2017-11-13 2018-03-06 广东电网有限责任公司电力调度控制中心 A kind of definite value choosing method of flexible direct current power transmission system bridge arm overcurrent protection
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