CN107482576B - A kind of starting control strategy of hybrid high voltage DC breaker - Google Patents
A kind of starting control strategy of hybrid high voltage DC breaker Download PDFInfo
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- 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
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Abstract
The invention discloses a kind of starting control strategy of hybrid high voltage DC breaker, which start hybrid high voltage DC breaker smoothly by reasonable switch motion timing.Energy is taken since load-transfer switch and main circuit breaker directly pass through respective submodule capacitor, without external power supply, insoluble insulation and pressure-resistant problem in engineering are avoided, design, manufacture and difficulty of construction is reduced, is conducive to the application of the breaker topology in high-voltage direct current power grid.Meanwhile the hybrid high voltage DC breaker start-up course of the present invention is smooth, and it is small to power grid impact, the stable operation of power grid will not be had an impact.
Description
Technical field
The invention belongs to power electronic system technical fields, and in particular to a kind of starting of hybrid high voltage DC breaker
Control strategy.
Background technique
Ability is received to solve trans-regional, extensive power transmission and promoting distributed new, it is more based on modularization
The flexible direct current electric power network technique of level converter is increasingly becoming one of the important directions of China's power grid future development.It is defeated with exchanging
Electricity and Traditional DC technology of transmission of electricity compare, flexible DC transmission have active power reactive power can decoupling control, be not necessarily to nothing
The advantages that Reactive power compensation installations, occupied area are small, output voltage waveforms are high-quality.Although however its have in terms of steady-state operation it is aobvious
Work advantage, but its in terms of DC fault and processing there are still larger technical problem, wherein high voltage DC breaker is ground
System is wherein the most key technological difficulties.
For current Development Status, the hybrid high voltage direct current based on conventional mechanical switch and power electronic devices combination
The prospect of breaker most large-scale commercial application.It is hybrid that ABB AB announced that it develops first of the world in 2012
High voltage DC breaker, switch off time 5ms, voltage rating 320kV, current breaking capacity are about 9kA.Alstom company in
2013 announce that the supper-fast mechano-electronic breaker of its research and development succeeds, voltage rating 120kV, and current breaking capacity is about
5.2kA.Global energy study Internet institute announced to develop the hybrid high voltage direct current for completing that voltage rating is 200kV in 2014
Breaker, can in 3ms disjunction 15kA fault current, and in December, 2016 five end flexible DC transmission engineering of Zhoushan at
Function puts into operation.It is energized however, the above breaker is all made of the driving circuit that the mode of external power supply is IGBT in breaker, but due to
Breaker needs to be connected in DC line, and DC voltage level is higher, therefore to the insulation of external power supply circuit, resistance to pressure energy
Power proposes high requirement, this defect greatly limits application of the dc circuit breaker in field of high-voltage technology.
In order to make dc circuit breaker have self energizing ability, it is necessary first to be filled to the capacitor in dc circuit breaker
Electricity, i.e. the starting control of dc circuit breaker.
Summary of the invention
In view of above-mentioned, the present invention provides a kind of starting control strategies of hybrid high voltage DC breaker, pass through conjunction
The switch motion timing of reason, enables hybrid high voltage DC breaker smoothly to start.
A kind of starting control strategy of hybrid high voltage DC breaker, the hybrid high voltage DC breaker is by daily
Through-flow branch and failure cutout branch circuit parallel connection composition, one end is connected by disconnecting switch and reactor with converter station, another
End is then connected with DC power transmission line；The daily through-flow branch includes supper-fast mechanical switch and load-transfer switch, ultrafast
One end of fast mechanical switch is connected with disconnecting switch, one end phase of the other end and load-transfer switch of supper-fast mechanical switch
Even, the other end of load-transfer switch is connected with DC power transmission line；The failure cutout branch routing main circuit breaker and arrester
Parallel connection is constituted, and the main circuit breaker and load-transfer switch are composed in series by several modified full-bridge submodules；
The starting control strategy includes the following steps:
(1) when converter station works, it is closed the disconnecting switch being connected with hybrid high voltage DC breaker, by converter station
Transimission power reference value is set as lower value, guarantees that the electric current in DC power transmission line maintains reduced levels；
(2) enabled using the capacitance voltage when the capacitance voltage of submodule any in main circuit breaker reaches certain threshold value
Its corresponding IGBT drive circuit, and then charging is grouped to submodule capacitor each in main circuit breaker；
(3) it after main circuit breaker charging complete, sets it on state and is closed supper-fast mechanical switch；
(4) after a period of time, submodule a small amount of in main circuit breaker is turned off, these submodule capacitors are superimposed reversed
Voltage makes DC current be transferred to daily through-flow branch road, to charge to load-transfer switch；
(5) after load-transfer switch is completed to charge, load-transfer switch and main circuit breaker are set as on state.
Further, the modified full-bridge submodule includes a capacitor C, two IGBT pipes with anti-paralleled diode
T1~T2 and two diode D1~D2；Wherein, the emitter of IGBT pipe T1 is connected with the cathode of diode D1 and constitutes son
The collector of one end of module, IGBT pipe T1 is connected with the collector of the anode of capacitor C and IGBT pipe T2, the hair of IGBT pipe T2
Emitter-base bandgap grading is connected with the cathode of diode D2 and constitutes the other end of submodule, the anode of the anode of diode D1 and diode D2 with
And the cathode of capacitor C is connected, the base stage of IGBT pipe T1 and T2 connect the switching drive signal that corresponding IGBT drive circuit provides.
Further, the transimission power reference value of converter station is set as lower value in the step (1), which sets
For 1%~5% converter station rated power.
Further, in the step (2) when the capacitance voltage of submodule any in main circuit breaker reaches certain threshold value,
The threshold value is set as 30% capacitor voltage rating.
Further, charging is grouped to submodule capacitor each in main circuit breaker in the step (2), i.e. grouping shutdown
Submodule in main circuit breaker in turn charges to the submodule capacitor in current shutdown group, the group is connected after charging complete
And turn off next group.
Further, submodule a small amount of in main circuit breaker is turned off in the step (4), the submodule quantity of shutdown is omited
More than the submodule sum in load-transfer switch.
Before breaker puts into operation, since submodule capacitor charges not yet, its touching cannot be provided to IGBT
Energy required for sending out needs to carry out breaker at this time starting and fills energy.Under normal circumstances, this scene appears in dc circuit breaker
It has been installed that, but the initial debugging moment that direct current system not yet starts；The present invention is made hybrid by reasonable control strategy
High voltage DC breaker can smoothly start, therefore have following advantageous effects:
(1) load-transfer switch and main circuit breaker of the present invention directly pass through its submodule capacitor take can, be not necessarily to external power supply,
Insoluble insulation and pressure-resistant problem in engineering are avoided, design, manufacture and difficulty of construction is reduced, is conducive to the breaker
Application of the topology in high-voltage direct current power grid.
(2) the hybrid high voltage DC breaker start-up course of the present invention is smooth, small to power grid impact, will not be to the steady of power grid
Fixed operation has an impact.
Detailed description of the invention
Fig. 1 is the topological structure schematic diagram of hybrid high voltage DC breaker.
Fig. 2 (a) is the current flow paths schematic diagram under IFBSM on state.
Fig. 2 (b) is the current flow paths schematic diagram under IFBSM off state.
Fig. 3 (a) is the preliminary charging schematic diagram of hybrid high voltage DC breaker main circuit breaker.
Fig. 3 (b) is the grouping charging schematic diagram of hybrid high voltage DC breaker main circuit breaker.
Fig. 3 (c) is the switched charge schematic diagram of hybrid high voltage DC breaker load transfer.
Fig. 3 (d) is that the starting of hybrid high voltage DC breaker finishes schematic diagram.
Fig. 4 is the test macro schematic diagram of four end DC grids.
Fig. 5 (a) is the current waveform figure for flowing through circuit breaker load transfer switch and main circuit breaker.
Sub-module capacitance voltage and main circuit breaker submodule capacitor voltage waveform diagram are removed in Fig. 5 (b) idling that is negative.
Fig. 5 (c) is the voltage oscillogram of supper-fast mechanical switch, load-transfer switch and main circuit breaker both ends.
Fig. 6 (a) is the DC voltage waveform figure of four converter stations.
Fig. 6 (b) is the dc current waveform figure of four converter stations.
Specific embodiment
In order to more specifically describe the present invention, with reference to the accompanying drawing and specific embodiment is to technical solution of the present invention
It is described in detail.
Research object of the invention is hybrid high voltage DC breaker shown in FIG. 1, and the breaker is by daily through-flow branch
Road and failure cutout branch composition；Wherein, daily through-flow branch includes supper-fast mechanical switch and load-transfer switch；Failure is disconnected
It flows branch routing main circuit breaker and arrester parallel connection is constituted.Load-transfer switch and master in the hybrid high voltage DC breaker is disconnected
Road device is composed in series by several improvement type full-bridge submodules (IFBSM).
The IFBSM that the present invention uses is made of 2 IGBT, 4 diodes and 1 sub- module capacitance.Improvement type full-bridge
Submodule mainly includes two kinds of switch states, is on state and off state respectively, specific as follows:
1. on state；When the IGBT in IFBSM is opened, electric current is directly flowed through from IGBT or its parallel diode,
Capacitor is bypassed；This switch state is known as on state, shown in the circulation path of electric current such as Fig. 2 (a).
2. off state；When the IGBT in IFBSM is turned off, electric current needs are flowed through from capacitor, the stream of DC current
Lead to interrupted；This switch state is known as off state, shown in the circulation path of electric current such as Fig. 2 (b).
As can be seen that the submodule capacitor inside load-transfer switch and main circuit breaker can charge fortune when operating normally
Row.By the switching of different running method, it can be made quickly, timely to supplement energy from DC side, which is stored
In submodule capacitor, by the auxiliary circuits of certain forms to the drive circuitry of IGBT, to realize high voltage direct current
The self energizing of breaker is run.
Before breaker puts into operation, since IFBSM capacitor charges not yet, its triggering cannot be provided to IGBT
Required energy needs to carry out breaker at this time starting and fills energy.Under normal circumstances, this scene has appeared in dc circuit breaker
It installs, but the initial debugging moment that direct current system not yet starts.
The starting control strategy of the hybrid high voltage DC breaker of the present invention mainly comprises the steps that
(1) each converter station has charged and has finished in direct current system, the preparation before starting is completed, and novel high-pressure direct current is disconnected
Road device has installed, and the supper-fast mechanical switch of daily through-flow branch is in an off state, the IGBT of load-transfer switch
In an off state due to lacking trigger energy, the IGBT of failure cutout branch is also at off state.
(2) each converter station starting, transimission power reference value are set as lower value (such as 1%~5% specified biography in direct current system
Defeated power), guarantee that the electric current in DC line maintains reduced levels.Since supper-fast mechanical switch is closed not yet, so
Electric current will be flowed through from main circuit breaker；Since the IFBSM in main circuit breaker is in an off state, no matter DC current direction such as
What, all will be capacitor charging, as shown in Fig. 3 (a)；DC current has been controlled in reduced levels, therefore submodule in main circuit breaker
The rate of climb of block capacitance voltage is more slow.
(3) threshold value (such as 30% rated capacity needed for the submodule capacitor voltage in main circuit breaker reaches IGBT triggering
Voltage) when, IGBT drive circuit is enabled, and charging is grouped to the submodule capacitor of main circuit breaker.Due in submodule
Capacitor is the DC voltage for being directly connected in DC line, therefore improving route high-voltage end；In order to surpass DC voltage not
Specified operation threshold is crossed, therefore is charged using the method for grouping charging to the submodule capacitor of main circuit breaker, such as Fig. 3 (b)
It is shown.
(4) after main circuit breaker charging complete, on state is set it to.Electric current is flowed through from main circuit breaker, supper-fast machine
The voltage that tool switch is born is almost nil, therefore can be closed without pressure without stream, and equipment is avoided to damage.
(5) IFBSM in a small amount of (number is slightly more than load-transfer switch Neutron module number) main circuit breaker is turned off, this
A little superimposed backward voltage of module capacitance makes DC current be transferred to normal circulation branch up, thus to load call away to
Capable charging is put into, as shown in Fig. 3 (c).There are two the purposes for only turning off the submodule in a small amount of main circuit breaker: first is that in order to reduce
The voltage that load-transfer switch is born, second is that the capacitor for proof load transfer switch can be charged to rated value.
(6) after load-transfer switch is completed to charge, load-transfer switch and main circuit breaker are all set as on state.By
It is much larger than the resistance of normal circulation path in the resistance of main circuit breaker, therefore DC current will flow through supper-fast mechanical switch and bear
Transfer switch is carried, direct current system value and power reference is promoted to nominal later, system enters steady state mode of operation, such as Fig. 3
(d) shown in.
In order to verify the validity of the hybrid high voltage DC breaker starting control strategy of the present invention, we are in PSCAD/
Four end DC grid test macros as shown in Figure 4 have been built in EMTDC simulation software.Test scene are as follows: each in DC network
The preparation before starting is completed in inverter, and the high voltage DC breaker of 1,3,4 side of converter station has installed and completed to fill
It can operate, the high voltage DC breaker of 2 side of converter station has installed, but not yet fills energy.
In order to reduce charging current, extend the submodule charging time, the value and power reference of converter station 1,2,3 is set as volume
The 5% of constant volume, wherein converter station 1,2 is used to DC side transmission power, converter station 3 to exchange side transmission power, converter station 4
Constant voltage control, voltage reference value are set as 500kV.
Direct current system starts operation in t=0.2s.The dynamic characteristic of high voltage DC breaker B24 shown in Fig. 5, wherein
Fig. 5 (a) is the electric current for flowing through circuit breaker load transfer switch and main circuit breaker, and sub-module capacitor is removed in Fig. 5 (b) idling that is negative
Voltage and main circuit breaker submodule capacitor voltage, Fig. 5 (c) are supper-fast mechanical switch, load-transfer switch and main circuit breaker two
The voltage at end.The characteristic of direct current system shown in Fig. 6, wherein Fig. 6 (a) is the DC voltage of four converter stations, Fig. 6 (b) is four
The DC current of a converter station.
After it can be seen that system starting in analogous diagram, charge first to the submodule capacitor of main circuit breaker, electricity
Hold voltage to grow steadily, the charging current average value during this is about 25A.Since the IFBSM of main circuit breaker is direct
It is connected on DC line 24, so the DC voltage of converter station 2 rises with the rising of submodule capacitor voltage.In t=
Main circuit breaker capacitance voltage reaches 0.3kV when 0.463s, and IGBT drive circuit unlock can control IFBSM, then divide
Group charges to the submodule of main circuit breaker, and capacitance voltage is charged to upper limit threshold 1.1kV quickly.It is opened in t=0.686s
Beginning charges to the submodule of load-transfer switch, and the electric current for flowing through main circuit breaker is transported rapidly load-transfer switch
Come on branch.By the charging process of about 29ms, the submodule charging of load-transfer switch is finished, and entire breaker completes starting
Filling can process.
Furthermore it can also be seen that DC current can fuctuation within a narrow range during energy is filled in breaker starting.By about 1s, wave
Dynamic adjustment finishes, and direct current system restores steady-state operating condition, and the safe and stable operation characteristic of system is unaffected.
The above-mentioned description to embodiment is for that can understand and apply the invention convenient for those skilled in the art.
Person skilled in the art obviously easily can make various modifications to above-described embodiment, and described herein general
Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, the improvement made for the present invention and modification all should be in protection scope of the present invention
Within.
Claims (3)
1. a kind of starting control strategy of hybrid high voltage DC breaker, the hybrid high voltage DC breaker is by day normal open
Branch and failure cutout branch circuit parallel connection composition are flowed, one end is connected by disconnecting switch and reactor with converter station, the other end
Then it is connected with DC power transmission line；The daily through-flow branch includes supper-fast mechanical switch and load-transfer switch, supper-fast
One end of mechanical switch is connected with disconnecting switch, and the other end of supper-fast mechanical switch is connected with one end of load-transfer switch,
The other end of load-transfer switch is connected with DC power transmission line；The failure cutout branch routing main circuit breaker and arrester are in parallel
It constitutes, the main circuit breaker and load-transfer switch are composed in series by several modified full-bridge submodules；
The modified full-bridge submodule includes a capacitor C, two IGBT pipe T1~T2 and two with anti-paralleled diode
A diode D1~D2；Wherein, the emitter of IGBT pipe T1 is connected with the cathode of diode D1 and constitutes one end of submodule,
The collector of IGBT pipe T1 is connected with the collector of the anode of capacitor C and IGBT pipe T2, the emitter of IGBT pipe T2 and two poles
The cathode of pipe D2 is connected and constitutes the other end of submodule, the anode of diode D1 and the anode of diode D2 and capacitor C's
Cathode is connected, and the base stage of IGBT pipe T1 and T2 connect the switching drive signal that corresponding IGBT drive circuit provides；
The starting control strategy includes the following steps:
(1) when converter station works, it is closed the disconnecting switch being connected with hybrid high voltage DC breaker, by the transmission of converter station
Value and power reference is set as lower value, which is set as 1%~5% converter station rated power；
(2) when the capacitance voltage of submodule any in main circuit breaker reaches certain threshold value, it is right that its is enabled using the capacitance voltage
The IGBT drive circuit answered, and then charging is grouped to submodule capacitor each in main circuit breaker；
(3) it after main circuit breaker charging complete, sets it on state and is closed supper-fast mechanical switch；
(4) after supper-fast mechanical switch is closed completely, submodule a small amount of in main circuit breaker is turned off, these submodule capacitors are folded
Backward voltage after adding makes DC current be transferred to daily through-flow branch road, to charge to load-transfer switch；
(5) after load-transfer switch is completed to charge, load-transfer switch and main circuit breaker are set as on state.
2. starting control strategy according to claim 1, it is characterised in that: when in main circuit breaker in the step (2)
When the capacitance voltage of one submodule reaches certain threshold value, which is set as 30% capacitor voltage rating.
3. starting control strategy according to claim 1, it is characterised in that: to each in main circuit breaker in the step (2)
Submodule capacitor is grouped charging, i.e. submodule in grouping shutdown main circuit breaker, in turn to the submodule in current shutdown group
Block capacitor charges, and the group is connected after charging complete and turns off next group.
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| CN109347083B (en) * | 2018-12-05 | 2023-08-18 | 贵州电网有限责任公司 | Distributed power generation circuit structure of direct current distribution system |
| CN109981092A (en) * | 2019-01-14 | 2019-07-05 | 全球能源互联网研究院有限公司 | The hybrid dc circuit breaker and application method of a kind of full-bridge modules, full-bridge modules |
| CN209929952U (en) * | 2019-03-21 | 2020-01-10 | 许继集团有限公司 | Novel direct current breaker |
| KR20200124362A (en) * | 2019-04-23 | 2020-11-03 | 현대자동차주식회사 | System of controlling battery charging or discharging |
| CN110768233A (en) * | 2019-10-15 | 2020-02-07 | 国网江苏省电力有限公司经济技术研究院 | Combined high-voltage direct-current circuit breaker applicable to direct-current power grid and having power flow control function and control method thereof |
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| CN107086547A (en) * | 2017-04-18 | 2017-08-22 | 浙江大学 | A kind of combined high-voltage dc circuit breaker and its self energizing strategy with self energizing ability |
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