CN110165676A - The compound direct current flow controller for having failure current limit and cut-out function - Google Patents
The compound direct current flow controller for having failure current limit and cut-out function Download PDFInfo
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- CN110165676A CN110165676A CN201910378059.7A CN201910378059A CN110165676A CN 110165676 A CN110165676 A CN 110165676A CN 201910378059 A CN201910378059 A CN 201910378059A CN 110165676 A CN110165676 A CN 110165676A
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- current
- capacitor
- flow controller
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- fault
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Classifications
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- 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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
Abstract
The present invention provides the compound direct current flow controller topology for having failure current limit and breaking capability.The topology includes the dc circuit breaker part of flow controller part and two lines road with current limiting capacity, and the two shares capacitive branch.Flow controller part by the on-off of control switch pipe, enables shared inductance timesharing in parallel with the capacitor of two lines road under normal operating conditions, and three carries out energy exchange to control Line Flow.When ground fault occurs for a certain route, it is latched power flowcontrol ability, shared inductance is sealed in into faulty line and carries out current limliting.The dc circuit breaker that enables on faulty line controls the on-off of thyristor using capacitor on route in the voltage of power flowcontrol stage institute's band simultaneously, capacitor is in parallel with arrester and be capacitor charging.Final triggering arrester conducting, fault current are consumed in arrester branch, to achieve the purpose that disengagement failure route.
Description
Technical field
The invention belongs to transmission & distribution electro-technical fields, and in particular to the compound direct current tide with failure current limit and breaking capability
Stream controller topology.
Background technique
Multi-terminal HVDC transmission and DC grid technology are as solving the problems, such as that extensive renewable energy is grid-connected and consumption has
Effect means become one of the important directions of Future Power System research and development.The characteristics of DC grid is to contain mesh and superfluous
It is remaining, there may be a plurality of transmission line of electricity between converter station, improve the flexibility and reliability of system, while also make its power flowcontrol
It is more prominent with error protection problem.When the circuitry number of system is greater than converter station number, it may appear that the inadequate problem of freedom degree, this
When need to introduce DC power flow controller to control effectively to the trend of whole system.
Existing DC power flow controller can be four kinds, i.e., variable resistance, DC/DC converter, auxiliary voltage source and
Flow controller between line.Variable resistance changes the equivalent resistance for sealing in branch, and then adjusting circuit electricity by the switching of switch
Stream, consumption power is big, does not apply in practical projects generally.DC/DC converter takes energy from direct current system, defeated using modulation control
Alternating voltage out carries out load flow regulation through inversion output DC voltage again after transformer, and required power electronic devices is more, at
This is higher.Auxiliary voltage source takes energy from AC system, and converter transformer valve-side needs to bear direct current system grade high pressure, wants to insulation
It asks high and increases equipment cost.Between line DC power flow controller using the energy exchange between two lines road to Line Flow into
Row control.One is sealing in capacitor timesharing two different routes and adjust trend, and structure is simple, at low cost, but
Current ripples can be introduced.Another kind is respectively connected to two capacitors on two lines road, is connected with switching device with inductance between capacitor
It connects, passes through the energy exchange load disturbance between inductance and capacitor.
When DC grid breaks down, since its is low-resistivity, fault current can increase to the number of rated current in 10ms
Ten times, jeopardize the safe operation of converter station device and whole system.It is main at present that faulty line is carried out by dc circuit breaker
Excision.Dc circuit breaker can conventionally be divided into mechanical dc circuit breaker, all solid state formula dc circuit breaker and hybrid
Dc circuit breaker.Hybrid circuit breaker is the integrated of mechanical and all solid state formula, with reliable for operation, loss is small, cut-offs speed
Fast advantage.In view of the manufacture level of current dc circuit breaker, often direct current limiter and breaker are used cooperatively, to short circuit
Electric current carries out the excision for carrying out faulty line after effectively inhibiting again.
Current DC power flow is controlled and is mainly realized respectively by two kinds of equipment with error protection, each element utilization rate and device
Integrated level is low, increases the cost and occupied area of system.Document " DC grid power flowcontrol and fault control set composite "
A kind of set composite with DC power flow control and fault control function is proposed, but does not consider the reversed feelings of fault current
Condition.Document " the dc circuit breaker Simulation Modeling for having power flowcontrol function " then proposes a kind of power flowcontrol that is able to achieve
Dc circuit breaker structure, but do not have failure current limit ability.Therefore, for having DC power flow control and failure protection function
Many theory and technology problems of set composite, it is also necessary to in-depth study.
Summary of the invention
In view of the above-mentioned problems, this paper presents one kind to have failure current limit and open circuit on the basis of above-mentioned each scheme
The compound direct current flow controller of function.Under normal operating conditions, pass through the concatenated capacitor in control two lines road and electricity
Energy exchange between sense carries out power flowcontrol；Inductance is sealed in into failure when monopolar grounding fault occurs for a certain route wherein
Route carries out current limliting, and puts into breaker portion excision faulty line.
In the present invention, inductance progress power flow regulating in parallel with capacitor when route is operated normally is sealed in line fault
Faulty line can effectively fault current limiting climbing and peak value.Capacitor both ends during power flowcontrol have voltage, phase
It is pre-charged when in capacitor, in breaking process using the on-off of capacitance voltage control thyristor, carries out the disconnected of faulty line
Road.With flow controller compared with breaker isolated operation, which effectively reduces the application of power electronic devices,
It reduces costs.
Detailed description of the invention
Fig. 1 is the compound direct current flow controller structural schematic diagram for having failure current limit and breaking capability, including is had
The DC power flow controller part of current-limiting function and the dc circuit breaker part of two lines road.
Fig. 2 is the structural schematic diagram with the DC power flow controller of current-limiting function；Wherein, V1、V2、V3、V4、V5、V6、
V7、V8Represent insulated gate bipolar transistor, D1、D2、D3、D4、D5、D6、D7、D8Represent diode, V11、V12、V13、V14It represents more
A concatenated insulated gate bipolar transistor and its anti-paralleled diode, L indicate inductance, DC Current Breaker1, DC
Current Breaker2 represents dc circuit breaker part, and I represents converter station output electric current, I1、I2Represent the electricity of two lines road
Stream, ILIndicate the electric current on inductance；
Fig. 3 is that two lines road electric current is reciprocal, carries out the schematic diagram that route 1 and inductance when power flowcontrol carry out energy exchange；
Fig. 4 is that two lines road electric current is reciprocal, carries out the schematic diagram that route 2 and inductance when power flowcontrol carry out energy exchange；
Fig. 5 is that two lines road electric current is reciprocal, is latched schematic diagram when power flowcontrol function
Fig. 6 is that the schematic diagram that failure current limit is carried out when monopolar grounding fault occurs for route 1；
Fig. 7 is the dc circuit breaker partial-topology structural schematic diagram on route 1；Wherein, T1a、T1b、T2a、T2b、T3a、T3b、
T4a、T4bRepresent silicon controlled rectifier (SCR), V1a、V1b、V2a、V2bRepresent insulated gate bipolar transistor and its anti-paralleled diode, C1
Capacitor is represented, UFD1, UFD2 represent Fast mechanical switch, MOA1、MOA2Arrester is represented, N1, M1 are two nodes；
Fig. 8 is the dc circuit breaker partial bypass schematic diagram on route 1；
Fig. 9 is the schematic diagram that fault current is transferred to thyristor branch on route 1；
Figure 10 is that fault current gives capacitor charging schematic diagram on route 1；
Figure 11 is the schematic diagram that fault current is consumed through arrester on route 1.
Specific embodiment
For the performance and working principle that the present invention is further explained, constituted mode and work below in conjunction with attached drawing to invention
Principle is specifically described.
The present invention is suitable for two lines road electric current I1、I2It is connect for any one generation monopole in different directions and two lines road
The operating condition of earth fault constantly.As shown in Fig. 2, with electric current I, I1Direction be from left to right, electric current I2Direction be from right to left for,
Illustrate the working method of the invention.
In normal operation, locking fault current inhibits and faulty line cuts off function, puts into power flowcontrol function.
Dc circuit breaker portion of electrical current on route is as shown in Figure 7.Power flowcontrol requires to adjust electric current I1Increase.As shown in Figure 2, electric
Flow I1Equal to electric current I and electric current I2The sum of numerical value.It is assumed that electric current I is definite value, then increase electric current I2Electric current I1Also can increase therewith
Greatly.Increase electric current I2, capacitor C1On voltage be left positive right negative.Switching tube V is opened first1、V3, make C1It is in parallel with L, C1To L
Charging, the electric current of L are gradually increased, ILDirection is from right to left, as shown in Figure 3.After a period of time, switching tube V is disconnected1、V3, open
Logical switching tube V5、V7, then C2In parallel with L, L is to C2Charging, capacitor C2On voltage be also that the electric current of left positive right negative L is gradually reduced,
As shown in Figure 4.It constantly repeats the above process, maintains the energy stabilization of two capacitors.If a switch periods are T, V1、V3Account for
Sky is than being D, V5、V7It is complementary conducting, duty ratio 1-D.Then electric current I1With I2Ratio be D/1-D.Choose I1、I2In one
It is a to be used as controlled current flow, electric current is adjusted to setting valve using PI closed-loop control.
After monopolar grounding fault occurs for route 1, it is latched power flowcontrol function, investment fault current inhibits and breaking function
Energy.Since breaking down, it is broadly divided into following steps:
Step 1: monopolar grounding fault occurs for route 1, detects failure after a period of time, triggers equipment in failure
Fault current is carried out under state to inhibit and open circuit control.The access of each electric current and the current path phase under normal operating conditions at this time
Together.
Step 2: it is delayed after a period of time, on-off switching tube V1~V8, the power flowcontrol function of interlock.Have at this time
Standby its part of the power flowcontrol of current limiting capacity is as shown in figure 5, the dc circuit breaker part on route 1 is as shown in Figure 8.
Step 3: being delayed after a period of time, turn off auxiliary switch V1a、V1b、V2a、V2b, while triggering and conducting thyristor
T1a、T2a, fault current is transferred to T1a、T2aBranch.Capacitor C1The electric current that place branch flows through is zero, under zero current condition
Turn off Fast mechanical switch UFD1、UFD2.Has its part of the power flowcontrol of current limiting capacity at this time still as shown in figure 5, on route 1
Dc circuit breaker part it is as shown in Figure 9.
Step 4: being delayed after a period of time, ensure that the direction of fault current will not change again.Turn off switching group V11, and open
Logical switching tube V2、V3, by inductance L connect inlet wire road 1 in, the rising of fault current limiting.Has the trend control of current limiting capacity at this time
Its part is made as shown in fig. 6, the dc circuit breaker part on route 1 is as shown in Figure 9.
Step 5: it is delayed after a period of time, Fast mechanical switch UFD1、UFD2Have reached specified open away to thyristor T3a
Triggering and conducting signal.Due to T before1aConducting, T3aBear capacitor C1On positive voltage and have trigger signal, T3aConducting.Thyristor
T1aIt is turned off after bearing a period of time back-pressure, electric current is rapidly by T1aZhi Luxiang T3aBranch transfer, capacitor C1It seals in faulty line,
Start to discharge.Have its part of the power flowcontrol of current limiting capacity at this time as shown in fig. 6, the dc circuit breaker part on route 1 such as
Shown in Figure 10.
Step 6: terminating through the electric discharge of capacitor after a period of time, be reversed charging later.Capacitor C1Both end voltage constantly rises,
Final triggering arrester MOA2Conducting.Has its part of the power flowcontrol of current limiting capacity at this time as shown in fig. 6, straight on route 1
It is as shown in figure 11 to flow breaker portion.Fault current consumes in the absorption circuit that arrester forms, by faulty line from direct current
It is cut off away in system, non-faulting part can restore to operate normally.
It is illustrated by above-mentioned it is found that is proposed has the compound direct current power flowcontrol of failure current limit and breaking capability
Device topology, can carry out the power flowcontrol between two lines road under normal operating conditions, and monopole occurs for a certain route wherein
Failure current limit and faulty line excision are carried out when ground fault.
Finally it should be noted that: described embodiment is only some embodiments of the present application, rather than whole realities
Apply example.Based on the embodiment in the application, those of ordinary skill in the art are obtained without making creative work
Every other embodiment, shall fall in the protection scope of this application.
Claims (5)
1. the compound direct current flow controller topology for having failure current limit and breaking capability, it is characterised in that: including having event
Hinder the dc circuit breaker part in the DC power flow controller part and route of current-limiting function.Direct current with failure current limit function
Flow controller part is mainly by two capacitors, a shared inductance and eight IGBT switching tubes and its series diode, four groups
Tandem tap pipe composition.Dc circuit breaker part on route is mainly by a capacitor, two groups of auxiliary switches and its inverse parallel
Diode, two Fast mechanical switch, the thyristor of four groups of reverse parallel connections and two arresters compositions.Two parts share capacitor branch
Road, branch road includes capacitor, auxiliary switch and Fast mechanical switch.
2. having the compound direct current flow controller topology of failure current limit and breaking capability, feature according to right 1
Be: in normal operation, four groups of tandem tap pipes of flow controller part are open-minded, the thyristor of breaker portion
It is turned off, electric current flows through shared capacitive branch.Opening and turning off by the switching tube of load disturbance controller allows and shares electricity
It is in parallel with two capacitors to feel timesharing, energy exchange is carried out between three, to control the trend of two lines road.Share inductance electricity
Stream direction is always that from right to left, in the case where different current directions is required from control, two capacitor both ends have different voltages.
3. having the compound direct current flow controller topology of failure current limit and breaking capability, feature according to right 1
It is: when monopolar grounding fault occurs for a certain item in two lines road, is first turned off eight IGBT switching tubes, is latched power flowcontrol
Device.Further according to the on-off of four groups of tandem tap pipes and eight IGBT switching tubes of fault current direction controlling, shared inductance is sealed in
Faulty line carries out current limliting, and sharing inductive current direction is still from right to left.If fault current direction is from dextrad on route 1
A left side then turns off V11Group switching tube, opens V2、V3, otherwise shutdown V12, open V1、V4.Route 2 is similar therewith.
4. having the compound direct current flow controller topology of failure current limit and breaking capability, feature according to right 1
It is: after monopolar grounding fault occurs for a certain item in two lines road, puts into dc circuit breaker part.First fault current is turned
Thyristor branch is moved to, Fast mechanical switch is disconnected under zero current condition, physically line disconnection.Later using on capacitor
The power flowcontrol stage it is with voltage control thyristor shutdown, capacitor is accessed again faulty line carry out reverse charging.Most
Whole capacitance voltage reaches certain value, and triggering and conducting arrester consumes fault current, faulty line is cut off.Fault current direction
A group thyristor is enabled when from right to left, otherwise enables b group thyristor.It, will in the case where fault current direction can change
When fault current is transferred to thyristor branch, two groups of thyristors of a, b can be put into simultaneously.
5. having the compound direct current flow controller topology of failure current limit and breaking capability, feature according to right 1
Be: inductance progress power flow regulating in parallel with capacitor when route is operated normally seals in faulty line progress in line fault
Current limliting.Capacitor both ends during power flowcontrol have voltage, are equivalent to and are pre-charged to capacitor, utilize electricity in breaking process
The on-off for holding voltage control thyristor, carries out the open circuit of faulty line.Normal operating conditions is closely connected with line fault conditions,
Inductance and capacitor utilization rate are high, with flow controller compared with breaker isolated operation, effectively reduce power electronic devices
Using reducing costs.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910378059.7A CN110165676A (en) | 2019-05-08 | 2019-05-08 | The compound direct current flow controller for having failure current limit and cut-out function |
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| CN201910378059.7A CN110165676A (en) | 2019-05-08 | 2019-05-08 | The compound direct current flow controller for having failure current limit and cut-out function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111082465A (en) * | 2019-12-16 | 2020-04-28 | 湖南大学 | Direct current power flow controller, control method and direct current power transmission system |
| CN111371100A (en) * | 2020-03-16 | 2020-07-03 | 华北电力大学 | Composite direct current power flow controller with fault current limiting and circuit breaking functions |
| CN111525541A (en) * | 2020-05-27 | 2020-08-11 | 东北电力大学 | Three-port direct current power flow controller topological structure with fault removal capability |
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| CN111525541A (en) * | 2020-05-27 | 2020-08-11 | 东北电力大学 | Three-port direct current power flow controller topological structure with fault removal capability |
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