CN105071425B - A kind of Hybrid HVDC system based on LCC and MMC - Google Patents
A kind of Hybrid HVDC system based on LCC and MMC Download PDFInfo
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- CN105071425B CN105071425B CN201510451611.2A CN201510451611A CN105071425B CN 105071425 B CN105071425 B CN 105071425B CN 201510451611 A CN201510451611 A CN 201510451611A CN 105071425 B CN105071425 B CN 105071425B
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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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- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The present invention relates to a kind of Hybrid HVDC system based on LCC and MMC, including a MMC transverter being made up of MMC submodules and the LCC inverter systems that are made up of at least one LCC, the DC terminal correspondence connection LCC inverter systems of MMC transverters；Include at least two MMC submodules on each bridge arm in MMC transverters.The system is not only simple in structure reliably, but also LCC and MMC respective advantage can be combined and respective shortcoming is overcome, alternating voltage is adjusted using the separately adjustable ability of MMC active reactive, so as to increase LCC maximum transmitted active power ability and reduce the possibility of its commutation failure；And at least two kinds of submodule can be accessed in MMC according to actual needs, control is more flexible and changeable, its DC terminal can be controlled to export corresponding voltage when DC side breaks down, so as to overcome common MMC can not effectively handle the shortcoming of DC Line Fault.
Description
Technical field
The present invention relates to a kind of Hybrid HVDC system based on LCC and MMC, belong to high voltage dc transmission technology neck
Domain.
Background technology
With the development of Electrical Power Technology, Traditional DC transmission system (is also known as line commutation transverter high-voltage dc transmission
Electric system, Line Commutated Converter Based High Voltage Direct Current, LCC-HVDC)
With its long-distance and large-capacity power transmission, active power is quick controllable the features such as be worldwide developed rapidly.But LCC-
HVDC is due to using the triode thyristor without self-switching-off capability as commutation components, it is necessary to real by the AC system of some strength
Existing commutation, this, which makes to there is Inverter Station, has commutation failure risk, weak AC system can not be powered, cannot function as power network and stop greatly
Need to consume the defects such as a large amount of reactive powers in the recovery power supply of electricity, and operation, its development is constrained to a certain extent.
Voltage source converter D.C. high voltage transmission (Voltage based on all-controlling power electronics device in recent years
Source Converter Based High Voltage Direct Current, VSC-HVDC) because its can independent control have
Work(reactive power, in the absence of commutation failure, can be passive island with power many advantages, such as obtain the favor of academia and industrial quarters.
And the MMC-HVDC based on modularization multi-level converter has that favorable expandability, output voltage waveforms quality are high, switching frequency is low,
Running wastage is low, without AC filter installation many advantages, such as, it has also become the main trend of flexible direct current power transmission system.But
MMC-HVDC system costs are expensive, the shortcomings of can not effectively handle direct-current short circuit failure, make it in long range large capacity transmission
The operation of occasion is restricted.
The content of the invention
It is existing to solve it is an object of the invention to provide a kind of Hybrid HVDC system based on LCC and MMC
The problem of LCC DC transmission systems and MMC DC transmission systems have defect.
To achieve the above object, the solution of the present invention includes a kind of Hybrid HVDC system based on LCC and MMC, bag
The MMC being made up of a MMC submodules transverter and the LCC inverter systems being made up of at least one LCC are included, the MMC is changed
The DC terminal for flowing device connects the DC terminal of the LCC inverter systems by DC power transmission line correspondence；In the MMC transverters
Each bridge arm on include MMC submodules described at least two.
Include two kinds of MMC submodules on each bridge arm in the MMC transverters, respectively full-bridge submodule and
The ratio of full-bridge submodule and half-bridge submodule in half-bridge submodule, each bridge arm is more than or equal to 1：1.
In the MMC submodules, an at least seed module is mixing Shuangzi module, and the mixing Shuangzi module includes 4
Individual power model：T1, T2, T3, T4 and 2 electric capacity：C1, C2, the anode of the T1 connect the anode of the T4, the moon of the T2
Pole connects T3 negative electrode, and the negative electrode of the T1 connects the anode of the T2, and the negative electrode of the T4 passes through the electric capacity C2 connections institute
State T3 anode, connect the electric capacity C1 between the tie point and the T2 and T3 tie point of the T1 and T4, the T1 and
T2 tie point is a port of the mixing Shuangzi module, and the tie point of the C2 and T4 are the mixing Shuangzi module
Another port.
The power model is IGBT module, and the anode of the power model is the colelctor electrode of IGBT module, the power
The negative electrode of module is the emitter stage of IGBT module.
Each described equal one diode of reverse parallel connection of power model.
It is serially connected between the exchange end and ground of the LCC inverter systems and exchanges reactive power compensator group, the exchange nothing
Reactive power compensation installations group is in parallel with an alternating current filter group.
String is provided with DC flat-wave reactor on the dc bus of the LCC inverter systems.
A DC filter is connected between the dc bus of the LCC inverter systems.
In the Hybrid HVDC system that the present invention is provided, MMC transverters are connected respectively at the two ends of DC power transmission line
With LCC inverter systems, it is not only simple in structure reliably, but also can combine LCC and MMC respective advantage and overcome each
Shortcoming, alternating voltage is adjusted using the separately adjustable ability of MMC active reactive, so that the maximum transmitted for increasing LCC is active
Power capability and the possibility for reducing its commutation failure；And at least two kinds of son can be accessed in MMC according to actual needs
Module, control is more flexible and changeable, and its DC terminal can be controlled to export corresponding voltage when DC side breaks down, so that gram
The shortcoming of DC Line Fault can not effectively be handled by taking common MMC.
Brief description of the drawings
Fig. 1 is the system construction drawing of the Hybrid HVDC system based on LCC and MMC；
Fig. 2 is the structural representation for mixing Shuangzi module；
Fig. 3-1 is to mix the first working state schematic representation under submodule normal mode of operation；
Fig. 3-2 is to mix second of working state schematic representation under submodule normal mode of operation；
Fig. 3-3 is to mix the third working state schematic representation under submodule normal mode of operation；
Fig. 3-4 is to mix the 4th kind of working state schematic representation under submodule normal mode of operation；
Fig. 4-1 is to mix the one of which working state schematic representation under submodule non-blocking mode；
Fig. 4-2 is to mix another working state schematic representation under submodule non-blocking mode；
Fig. 5 is module mixed type module multilevel converter MMC topology diagram；
Fig. 6 is the topological structure schematic diagram of half-bridge submodule；
Fig. 7 is the topological structure schematic diagram of full-bridge submodule.
Embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Embodiment 1
As shown in figure 1, the Hybrid HVDC system includes sending end current conversion station and receiving end current conversion station, sending end current conversion station is main
It is made up of line commutation transverter LCC current converters, receiving end current conversion station is main by a modularization multi-level converter MMC structure
Into, wherein, the AC access sending end AC system of LCC current converters, MMC AC access receiving end AC system, LCC is changed
Stream device is connected to the two ends of DC power transmission line with MMC.
The AC of LCC current converters connects sending end AC network, sending end AC network and ground by converter power transformer
Between be serially connected with exchange reactive power compensator group, exchange reactive power compensator group it is in parallel with alternating current filter group ACF, changed for filtering out
Reactive power needed for harmonic current and offer produced by stream plant running.It is connected between the dc bus of LCC current converters
One DC filter DCF, and string is provided with DC flat-wave reactor on dc bus.DC flat-wave reactor and wave filter
DCF is connected to the DC side of LCC current converters, for stabilizing the ripple in direct current.
LCC current converters are the three-phase bridge circuits constituted based on the IGCT of half control type, can be 6 bridge arm structures
Into 6 pulse transverters, be to be made up of a line commutation transverter LCC；It can also be and be made up of two 6 pulse transverters
12 pulse transverters, be to be made up of two line commutation transverter LCC；It is, of course, also possible to be changed by more line commutations
Device LCC is flowed to constitute.By the control of the LCC current converters, the alternating current of sending end power network can be converted to direct current, and through straight
Stream transmission line of electricity is transmitted to receiving end current conversion station.By MMC control, the direct current on DC power transmission line can be converted to receiving end
The alternating current of AC system, send receiving-end system energy to transmit so as to realize.
MMC is made up of six bridge arms of three-phase, two seed modules is included on each bridge arm, one of which submodule is mixed
Shuangzi module is closed, another submodule is full-bridge submodule, half-bridge submodule or clamper Shuangzi module.
As shown in Fig. 2 the mixing Shuangzi module includes 4 IGBT modules：T1, T2, T3, T4 and 2 electric capacity：C1, C2, T1
Colelctor electrode connect T4 colelctor electrode, T2 emitter stage connects T3 emitter stage, and T1 emitter stage connects T2 colelctor electrode, T4's
Emitter stage connects electric capacity C1 by electric capacity C2 connections T3 colelctor electrode between the tie point of T1 and T4 tie point and T2 and T3,
T1 and T2 tie point is a port of the mixing Shuangzi module, and C2 and T4 tie point are the another of the mixing Shuangzi module
Individual port.Mix IGBT (T1, T2, T3, T4) all in Shuangzi module inverse parallels fly-wheel diode, T1, T2, T3, T4
Base stage receive respectively external equipment offer control signal.
The mixing Shuangzi module has two kinds of mode of operations, normal operation mode and non-blocking mode.In the normal operating mode,
Can only at most there is an IGBT conducting between T1 and T2, in order to prevent electric capacity C1 short circuits, T1 and T2 can not be simultaneously turned on；T3 and
Can only at most there is an IGBT conducting between T4.
Mix Shuangzi module in the normal mode of operation, there are 4 kinds of operation shapes under 4 kinds of working conditions, normal operation mode
State is as shown in Fig. 3-1 to 3-4, and (1) is the current direction when T1, T3 are turned on, and (2) are the current direction when T1, T4 are turned on,
(3) it is the current direction when T2, T3 are turned on, (4) are the current direction when T2, T4 are turned on.As shown in table 1, when T1, T3 are led
When logical, port output voltage be two capacitance voltages and；When T1, T4 are turned on, port output voltage is zero；When T2, T3 conducting
When, port output voltage is electric capacity C2 voltages；When T2, T4 are turned on, port output voltage is electric capacity C1 backward voltage, is
Export negative voltage.The sense of current does not influence port output voltage.In table 1, Usm represents submodule port output voltage.
Table 1
From the normal mode of operation of mixing Shuangzi module, the submodule can export 4 kinds of voltages, respectively twice electricity
Hold voltage, capacitance voltage, no-voltage and negative sense capacitance voltage.Illustrate that the submodule can replace 2 half-bridge submodules to export 2 times
While capacitance voltage, possess the negative voltage characteristic of full-bridge submodule, DC voltage utilization rate, lifting system capacity can be improved.
Shuangzi module is mixed under non-blocking mode, there are 2 kinds of running status such as Fig. 4-1 under 2 kinds of working conditions, non-blocking mode
With shown in 4-2.In the lockout condition, all IGBT are in off state.When flowing through forward current (sense of current is by A to B)
When, port output voltage be two capacitance voltages and；When flowing through negative current, port output voltage is electric for electric capacity C1 negative sense
Pressure, the i.e. voltage reverse with electric current.
The mixing Shuangzi module can export 4 kinds of voltages, respectively twice capacitance voltage, capacitance voltage, no-voltage and negative
To capacitance voltage.Due to one, the mixing Shuangzi module can export twice of capacitance voltage, so a mixing Shuangzi module
Equivalent to two half-bridge submodules, it can substitute two half-bridge submodules simultaneously.Being additionally, since the mixing Shuangzi module can
The voltage of negative sense is exported, it possesses the negative voltage characteristic of full-bridge submodule, so the mixing Shuangzi module can improve direct current
Press utilization rate, the capacity of lifting system.Moreover, two capacitors of mixing Shuangzi inside modules, can rationally match somebody with somebody as needed
The two capacitance voltages are put for different value.Under which, MMC application, such as reasonable disposition submodule can be effectively extended
Two capacitance voltages in block while realizing that the MMC improves modulation degree to possess STATCOM operation troubles ride-through capabilities.
In addition, during Hybrid HVDC system work, receiving end current conversion station can carry out active and reactive uneoupled control, and energy
Weak AC system is enough connected, or is powered to passive network, systems technology is improved.When there is short trouble in DC line, LCC
Current converter can overcome DC Line Fault by adjusting Trigger Angle.Because the bridge arm in MMC is by mixing Shuangzi module and other
One or several kinds of existing sub-module cascades are constituted, then, the hybrid MMC transverters have when in the light of actual conditions being expanded
It is widely used, possesses STATCOM operation troubles ride-through capability while such as improving modulation degree, saves system hardware cost
Deng.
Embodiment 2
In the present embodiment, two seed modules that each bridge arm in MMC includes be full-bridge submodule and half-bridge submodule,
As shown in Figure 5.Full-bridge submodule and half-bridge submodule are constituted with all-controlling power electronics device, such as IGBT, its topological structure
As shown in Figures 6 and 7.
Wherein, in each bridge arm full-bridge submodule and the ratio of half-bridge submodule be more than or equal to one to one, MMC by
In having used full-bridge submodule and half-bridge submodule to mix, when short trouble occurs in DC line, LCC current converters can lead to
Adjustment Trigger Angle is crossed to overcome DC Line Fault, and MMC can block short circuit current flow by locking submodule, or control its direct current
End output no-voltage, so as to effectively pass through direct-current short circuit failure, improves operational percentage of the system in direct-current short circuit failure, another
Aspect also reduces or avoided the use of the high direct current cables of cost, it is adaptable to overhead line transmission means, so as to improve and be
System economy.
In above-mentioned two embodiment, power model is IGBT, and it is not limited to IGBT, can also be other kinds of complete
Control type device, each one diode of device reverse parallel connection.
In above-mentioned two embodiment, sending end is LCC, and receiving end is MMC, and as other embodiments, sending end may be used also
To be MMC, receiving end is LCC.
In above-mentioned two embodiment, two kinds of MMC submodules are included on each bridge arm in MMC transverters, other are used as
Embodiment, it is not limited on two seed modules, bridge arm that further types of submodule can also be included.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is above-mentioned basic scheme, for those of ordinary skill in the art, according to the teachings of the present invention, designs various changes
The model of shape, formula, parameter simultaneously need not spend creative work.It is right without departing from the principles and spirit of the present invention
The change, modification, replacement and modification that embodiment is carried out are still fallen within protection scope of the present invention.
Claims (6)
1. a kind of Hybrid HVDC system based on LCC and MMC, it is characterised in that be made up of including one MMC submodules
MMC transverters and the LCC inverter systems being made up of at least one LCC, the DC terminal of the MMC transverters pass through direct current transportation
The DC terminal of the circuit correspondence connection LCC inverter systems；Include at least two on each bridge arm in the MMC transverters
Plant the MMC submodules；In the MMC submodules, an at least seed module is mixing Shuangzi module, the mixing Shuangzi mould
Block includes 4 power models：T1, T2, T3, T4 and 2 electric capacity：C1, C2, the anode of the T1 connect the anode of the T4, institute
The negative electrode for stating T2 connects T3 negative electrode, and the negative electrode of the T1 connects the anode of the T2, and the negative electrode of the T4 passes through the electric capacity
C2 connections T3 anode, the electric capacity C1 is connected between the tie point and the T2 and T3 tie point of the T1 and T4,
The tie point of the T1 and T2 are a port of the mixing Shuangzi module, and the tie point of the C2 and T4 are the mixing pair
Another port of submodule.
2. the Hybrid HVDC system according to claim 1 based on LCC and MMC, it is characterised in that the power mould
Block is IGBT module, and the anode of the power model is the colelctor electrode of IGBT module, and the negative electrode of the power model is IGBT moulds
The emitter stage of block.
3. the Hybrid HVDC system according to claim 2 based on LCC and MMC, it is characterised in that each work(
Rate module one diode of equal reverse parallel connection.
4. the Hybrid HVDC system according to claim 1 based on LCC and MMC, it is characterised in that the LCC is changed
It is serially connected between the exchange end and ground of flowing device system and exchange reactive power compensator group, the exchange reactive power compensator group and one
Alternating current filter group is in parallel.
5. the Hybrid HVDC system according to claim 1 based on LCC and MMC, it is characterised in that the LCC is changed
Flow string on the dc bus of device system and be provided with DC flat-wave reactor.
6. the Hybrid HVDC system according to claim 1 based on LCC and MMC, it is characterised in that the LCC is changed
A DC filter is connected between the dc bus for flowing device system.
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Families Citing this family (12)
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| CN106921172B (en) * | 2015-12-28 | 2020-06-30 | 国网智能电网研究院 | Topological structure of flexible ring network controller |
| CN105514957B (en) * | 2016-01-28 | 2017-12-22 | 南京南瑞继保电气有限公司 | One kind mixing back-to-back DC power transmission system and trend reversion control method |
| CN106451516B (en) * | 2016-08-27 | 2020-04-10 | 许继集团有限公司 | Direct-current fault ride-through method of hybrid multi-terminal high-voltage direct-current transmission system |
| CN106998151A (en) * | 2017-04-21 | 2017-08-01 | 上海交通大学 | Multilevel converter based on asymmetric Shuangzi module and half-bridge submodule |
| CN106877718B (en) * | 2017-04-21 | 2019-04-05 | 上海交通大学 | Modularization multi-level converter asymmetry Shuangzi module midpoint potential balance control method |
| EP3729583B1 (en) | 2017-12-21 | 2022-06-01 | Hitachi Energy Switzerland AG | Communicationless control of a converter station |
| CN108832605B (en) * | 2018-06-26 | 2019-05-31 | 西安科技大学 | The longitudinal protection method of identification mixing both-end DC power transmission line area internal and external fault |
| CN109659968B (en) * | 2018-12-28 | 2020-06-30 | 国网江苏省电力有限公司经济技术研究院 | Electromechanical transient modeling method for distributed access type LCC-MMC (lower control limit-multilevel converter) mixed direct-current system |
| CN111245212A (en) * | 2020-03-02 | 2020-06-05 | 华北电力大学 | Thyristor full-bridge energy consumption module for inhibiting LCC-HVDC commutation failure |
| CN111934340B (en) * | 2020-08-24 | 2021-11-19 | 华中科技大学 | Adaptive power-voltage droop control method and system for direct current transmission system |
| CN112072690B (en) * | 2020-09-30 | 2022-01-11 | 华中科技大学 | Modeling method of LCC-MMC series hybrid direct-current power transmission system |
| CN113067361B (en) * | 2021-04-29 | 2021-09-10 | 江苏省电力试验研究院有限公司 | Control method for improving cascade type hybrid direct current commutation failure ride-through capability |
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| EP2650999A2 (en) * | 2010-04-08 | 2013-10-16 | Alstom Technology Ltd | Multi module voltage source converter for a HVDC system |
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| CN102231520A (en) * | 2011-06-20 | 2011-11-02 | 浙江大学 | Hybrid DC (direct current) electric power transmission system |
| CN103701145B (en) * | 2014-01-02 | 2015-07-08 | 浙江大学 | Mixed MMC-based mixed direct current power transmission system |
| CN104320011B (en) * | 2014-10-20 | 2017-04-19 | 西安许继电力电子技术有限公司 | Hybrid sub-module MMC converter with direct-current fault ride-through capability |
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| EP2650999A2 (en) * | 2010-04-08 | 2013-10-16 | Alstom Technology Ltd | Multi module voltage source converter for a HVDC system |
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