CN104967141B - A kind of Hybrid HVDC system - Google Patents

A kind of Hybrid HVDC system Download PDF

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Publication number
CN104967141B
CN104967141B CN201510371728.XA CN201510371728A CN104967141B CN 104967141 B CN104967141 B CN 104967141B CN 201510371728 A CN201510371728 A CN 201510371728A CN 104967141 B CN104967141 B CN 104967141B
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China
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hvdc system
hybrid hvdc
mmc
t2
t1
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CN201510371728.XA
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Chinese (zh)
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CN104967141A (en
Inventor
刘欣和
吴金龙
王先为
张�浩
张军
行登江
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许继电气股份有限公司
西安许继电力电子技术有限公司
国家电网公司
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60Arrangements for transfer of electric power between AC networks via a high-tension DC link, HVDC transmission

Abstract

The present invention relates to a kind of Hybrid HVDC system, the Hybrid HVDC system is dipolar configuration, including positive pole converter power transformer and positive pole transverter, negative pole converter power transformer and negative pole transverter, in dipolar configuration, a wherein pole transverter is the MMC transverters that are made up of MMC submodules, another LCC inverter systems being extremely made up of at least one LCC.Hybrid HVDC system provided by the invention have simultaneously the characteristics of LCC HVDC technology maturation, cost is low and VSC HVDC without commutation failure, control is flexible, expands the advantages of performance is strong.

Description

A kind of Hybrid HVDC system

Technical field

The present invention relates to a kind of Hybrid HVDC system, belong to technical field of HVDC transmission.

Background technology

With the development of Electrical Power Technology, Traditional DC transmission system (also known as line commutation transverter high-voltage dc transmission Electric system, Line Commutated Converter Based High Voltage Direct Current, LCC-HVDC) Technology it is highly developed.LCC-HVDC systems have been widely used in submarine cable power transmission, Large Copacity long distance at present From the occasion such as transmission of electricity and the back-to-back interconnection of asynchronous power network.But LCC-HVDC systems there is Inverter Station commutation failure, nothing The defects of method in weak AC system power supply, running to needing to consume a large amount of reactive powers, restricts its to a certain extent Development.

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. As one kind of VSC-HVDC topologys, MMC-HVDC possesses the advantages of VSC-HVDC is all.Meanwhile because of the spy of MMC topological structures Point, MMC-HVDC systems are also equipped with that switching frequency is relatively low, switching loss is small, strong etc. excellent without alternating current filter group and autgmentability Point, this allows it to apply to the occasion of High Level DC Voltage, bulk power transmission.But MMC-HVDC system costs are expensive, nothing Method effectively handles the shortcomings of DC Line Fault and but restricts its utilization in long range bulk power transmission occasion.

For above-mentioned the deficiencies in the prior art, Hybrid HVDC technology turns into new study hotspot.Hybrid HVDC Without commutation failure, control is flexible, opens up by the characteristics of technology combines traditional LC C-HVDC technology maturations, cost is low and VSC-HVDC The advantages of malleability can be strong, while system transmission of electricity is met, the commutation that can be effectively improved current customary DC transmission of electricity receiving end is lost The problems such as losing, it is that one kind possesses higher skill in the case where flexible direct current does not still possess the present situation of the transmission line capability suitable with customary DC The configuration scheme of art economy.But the technology that the Hybrid HVDC technology is brand-new as one, at present world wide It is interior also to be started late still in research starting stage, the domestic research on Hybrid HVDC technology, in currently available technology Not a kind of effectively Hybrid HVDC system is to realize above-mentioned advantage.

The content of the invention

It is an object of the invention to provide a kind of Hybrid HVDC system, at the same have LCC-HVDC technology maturation, into The characteristics of this is low and VSC-HVDC without commutation failure, control is flexible, expands the advantages of performance is strong.

To achieve the above object, the solution of the present invention includes a kind of Hybrid HVDC system, the Hybrid HVDC system Unite as dipolar configuration, including positive pole converter power transformer and positive pole transverter, negative pole converter power transformer and negative pole transverter, it is described double In the structure of pole, wherein a pole transverter is the MMC transverters being made up of MMC submodules, it is another to be extremely made up of at least one LCC LCC inverter systems.

Bridge arm in the MMC includes half-bridge submodule, full-bridge submodule and/or clamper Shuangzi module.

Each bridge arm in the MMC is formed by half-bridge submodule and full-bridge submodule with one to one ratio cascade.

In the submodule of the MMC, at least one submodule is a mixing Shuangzi module, described to mix Shuangzi module bag Include 4 power models:T1, T2, T3, T4 and 2 electric capacity:C1, C2, the anode of the T1 connect the anode of the T4, the T2 Negative electrode connection T3 negative electrode, the negative electrode of the T1 connects the anode of the T2, and the negative electrode of the T4 is connected by the electric capacity C2 The anode of the T3 is connect, the electric capacity C1 is connected between the tie point and the T2 and T3 tie point of the T1 and T4, it is described 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 mould Another port of block.

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.

The Hybrid HVDC system also includes reactive power compensator, and the reactive power compensator connects AC network.

The Hybrid HVDC system also includes AC filter installation, and the AC filter installation connects AC network.

The invention provides a kind of more novel Hybrid HVDC system, it is not only simple in structure reliably, but also LCC and MMC respective advantage can be combined and overcome respective shortcoming:Handed over using the separately adjustable ability of MMC active reactive to adjust Voltage is flowed, so as to increase LCC maximum transmitted active power ability and reduce the possibility of its commutation failure;And can be with MMC According to the various types of submodules of access are actually needed, control is more flexible and changeable, can be controlled when DC side breaks down Its DC terminal exports no-voltage, the shortcomings that so as to overcome common MMC can not effectively handle DC Line Fault.

Brief description of the drawings

Fig. 1 is the structural representation of Hybrid HVDC system;

Fig. 2 is a kind of line commutation transverter LCC topological structure schematic diagram;

Fig. 3 is module mixed type module multilevel converter MMC topology diagram;

Fig. 4 is the topological structure schematic diagram of half-bridge submodule;

Fig. 5 is the topological structure schematic diagram of full-bridge submodule;

Fig. 6 is the topological structure schematic diagram for mixing Shuangzi module;

Fig. 7-1 is to mix the first working state schematic representation under submodule normal mode of operation;

Fig. 7-2 is to mix second of working state schematic representation under submodule normal mode of operation;

Fig. 7-3 is to mix the third working state schematic representation under submodule normal mode of operation;

Fig. 7-4 is to mix the 4th kind of working state schematic representation under submodule normal mode of operation;

Fig. 8-1 is to mix the one of which working state schematic representation under submodule non-blocking mode;

Fig. 8-2 is to mix another working state schematic representation under submodule non-blocking mode.

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 line commutation transverter LCC, modularization multi-level converter MMC, converter power transformer, alternating current filter group ACF, exchange reactive power compensator group, DC flat-wave reactor, DC filter DCF.LCC and MMC forms dipolar configuration, is also connected with alternating current filter group ACF on AC network and exchanges reactive power compensator.

It can be shunt capacitor to exchange reactive power compensator, or shunt reactor, static passive compensation device With one kind in phase modifier, it coordinates with alternating current filter group ACF, MMC, provides reactive-load compensation jointly for LCC.

DC filter DCF, the direct current of line commutation transverter are connected between two DC terminals of line commutation transverter The direct-flow positive pole end of negative pole end and modularization multi-level converter connects, the direct current negative pole end of tie point and line commutation transverter Between switch is serially connected between tie point and the direct-flow positive pole end of modularization multi-level converter, and the contact is by opening Close MRTB ground connection.The direct-flow positive pole end of line commutation transverter be the Hybrid HVDC system direct-flow positive pole end, modularization The direct current negative pole end of multilevel converter is the direct current negative pole end of the Hybrid HVDC system, the Hybrid HVDC system DC flat-wave reactor is serially connected with two direct current both positive and negative polarity circuits.

Most basic LCC is the three-phase bridge circuit by being formed based on the IGCT of half control type, but LCC can be 6 6 pulse wave transverters of individual bridge arm composition or 12 pulse wave transverters being made up of two 6 pulse wave transverters, can also be The more pulse wave transverters being made up of multiple 6 pulse wave transverters, as shown in Fig. 2 giving a kind of LCC embodiment.Namely Say, the LCC can be a most basic three-phase bridge circuit, can also be combined and formed by multiple three-phase bridge circuits.

MMC topological structure is as shown in Fig. 2 the MMC is made up of the bridge arm of three-phase six, and each bridge arm is by half-bridge topology submodule Block and full-bridge topology submodule are formed with one to one ratio cascade, while each bridge arm is also in series with bridge arm reactor L. The AC of the MMC, pass sequentially through converter power transformer with LCC identical ac grid systems and the soft resistance device that opens is connected this The AC of MMC three-phase bridge circuit.

Half-bridge submodule and full-bridge submodule in the MMC are formed based on all-controlling power electronics device such as IGBT, Its topological structure is as shown in Figure 3, Figure 4.

When the Hybrid HVDC system works, LCC and MMC access an AC system simultaneously, form mixing and present more Enter DC transmission system.During system operation, the separately adjustable ability of active reactive power of MMC systems can be made full use of, effectively Ground adjusts ac bus voltage, increases the maximum transmitted active power ability of LCC systems, reduces the transient overvoltage of LCC systems, LCC transverters commutation failure can also be reduced simultaneously may.When DC side breaks down, LCC systems can be touched by adjusting Phase angle is sent out to overcome DC Line Fault, MMC systems can realize that DC side no-voltage controls by the control to full-bridge submodule, So as to effectively overcome DC Line Fault.

Certainly, the topological structure of Hybrid HVDC system of the invention is not limited to above-described embodiment, such as passes through Rational collocation alternating current filter group ACF, while coordinate the reactive power of MMC control AC systems, so as to cancel reactive power Compensation device.

In above-described embodiment, the direct current negative pole end of line commutation transverter and the direct-flow positive pole of modularization multi-level converter End connects and is grounded, and the direct-flow positive pole end of line commutation transverter is the direct-flow positive pole end of the Hybrid HVDC system, mould The direct current negative pole end of block multilevel converter is the direct current negative pole end of the Hybrid HVDC system;Implement as others Example, can exchange LCC and MMC position, the direct-flow positive pole end of line commutation transverter and modularization multi-level converter it is straight Stream negative pole end is connected and is grounded, and the direct-flow positive pole end of modularization multi-level converter is the direct current of the Hybrid HVDC system Positive terminal, the direct current negative pole end of line commutation transverter are the direct current negative pole end of the Hybrid HVDC system.

In above-described embodiment, MMC includes half-bridge submodule and full-bridge submodule, and both ratios in each bridge arm are 1: 1, as other embodiments, the allocation ratio of half-bridge submodule and full-bridge submodule can be in the light of actual conditions configured. But also full-bridge submodule can be changed to clamper Shuangzi module as the case may be.

Embodiment 2

The present embodiment and the difference of embodiment 1 are:In MMC in the present embodiment, at least one submodule is mixing Shuangzi module.As shown in fig. 6, the mixing Shuangzi module includes 4 IGBT modules:T1, T2, T3, T4 and 2 electric capacity:C1, C2, T1 colelctor electrode connection T4 colelctor electrode, T2 emitter stage connection T3 emitter stage, T1 emitter stage connection T2 colelctor electrode, T4 Emitter stage by electric capacity C2 connections T3 colelctor electrode, connect electric capacity between T1 and T4 tie point and T2 and T3 tie point C1, T1 and T2 tie point are a port of the mixing Shuangzi module, and C2 and T4 tie point are the mixing Shuangzi module Another port.Mix in Shuangzi module all IGBT (T1, T2, T3, T4) inverse parallel fly-wheel diode, T1, T2, T3, T4 base stage receive the control signal of external equipment offer respectively.

Mixing Shuangzi module has two kinds of mode of operations, normal operation mode and non-blocking mode.In the normal operating mode, T1 Can only at most there is an IGBT conducting between T2, in order to prevent that electric capacity C1 is short-circuit, T1 and T2 can not be simultaneously turned on;T3 and T4 Between can only at most have IGBT conducting.

Mix Shuangzi module in the normal mode of operation, there are 4 kinds of working conditions, 4 kinds of operation shapes under normal operation mode For state as shown in Fig. 7-1 to 7-4, (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 are turned on 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 working conditions, 2 kinds of running status such as Fig. 8-1 under non-blocking mode Shown in 8-2.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, the negative sense that port output voltage is electric capacity C1 is electric Pressure, the i.e. voltage reverse with electric current.

Two capacitors of Shuangzi inside modules are mixed, can the two capacitance voltages of reasonable disposition be as needed difference Value.Under which, affiliated MMC application, such as two capacitance voltages in reasonable disposition submodule can be effectively extended To possess STATCOM operation troubles ride-through capabilities while realizing that the MMC improves modulation degree.

Also it is exactly that the submodule in MMC can be entirely the mixing Shuangzi module, can also be situations below:In MMC Bridge arm by mixing submodule and other one or several kinds of existing submodule (half-bridge submodule, full-bridge submodule, clamper Shuangzis Module) cascade composition, then, the MMC is hybrid MMC transverters.The hybrid MMC transverters are in the light of actual conditions opened up Had a wide range of applications during exhibition, possess STATCOM operation troubles ride-through capability while such as improving modulation degree, save system hardware Cost etc..

In above-described embodiment, power model is IGBT module, as other embodiments, power model this can be other Wholly-controled device.

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 (4)

1. a kind of Hybrid HVDC system, the Hybrid HVDC system is dipolar configuration, including positive pole converter power transformer and Positive pole transverter, negative pole converter power transformer and negative pole transverter, it is characterised in that in the dipolar configuration, wherein a pole change of current Device is the MMC transverters that are made up of MMC submodules, another LCC inverter systems being extremely made up of at least one LCC;
In the submodule of the MMC, at least one submodule is a 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.
2. Hybrid HVDC system according to claim 1, it is characterised in that the power model is IGBT module, The anode of the power model is the colelctor electrode of IGBT module, and the negative electrode of the power model is the emitter stage of IGBT module.
3. Hybrid HVDC system according to claim 1, it is characterised in that the Hybrid HVDC system is also wrapped Reactive power compensator is included, the reactive power compensator connects AC network.
4. Hybrid HVDC system according to claim 1, it is characterised in that the Hybrid HVDC system is also wrapped AC filter installation is included, the AC filter installation connects AC network.
CN201510371728.XA 2015-06-26 2015-06-26 A kind of Hybrid HVDC system CN104967141B (en)

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