CN102611096A - Bipolar direct current power transmission system with direct current failure self-elimination capacity - Google Patents
Bipolar direct current power transmission system with direct current failure self-elimination capacity Download PDFInfo
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Abstract
The invention discloses a bipolar direct current power transmission system with a direct current failure self-elimination capacity. The bipolar direct current power transmission system comprises two current converters, wherein the positive end and the negative end of the first current converter are connected with the positive end and the negative end of the second current converter through two direct current power transmission lines respectively; each current converter consists of a positive electrode current conversion unit and a negative electrode current conversion unit which are connected in series with each other; and joints of the positive electrode current conversion units and the negative electrode current conversion units are grounded. By adopting a bipolar structure, a failed pole is generally required to be closed during direct current failure, so that a perfect pole is not influenced; and therefore, the reliability of the system is improved. A technology that the middle part is led out and grounded is adopted, so that stage construction and storage increase and extension of the system are facilitated; a single pole is put into operation, and then two poles are put into operation, so that the investment benefit can be developed early; furthermore, a grounding branch supplies a current backflow channel to the system under a single-pole loop running mode; and the current of the grounding branch is extremely low during balance running.
Description
Technical field
The invention belongs to electric power system technology of transmission of electricity field, be specifically related to a kind of bipolar direct current transmission system with direct current fault self-cleaning ability.
Background technology
Modularization multi-level converter (Modular Multilevel Converter; MMC) form of employing half-bridge submodule cascade; Having the consistent plurality of advantages such as the dynamic voltage balancing requirement is low, favorable expandability, the output voltage waveforms quality is high, switching frequency is low, running wastage is low that trigger of device, is the outstanding person of voltage source converter topological structure of new generation.HVDC transmission system (MMC-HVDC) based on MMC is incorporated into the power networks at new forms of energy such as photovoltaic, wind-powered electricity generation and morning and evening tides; The power transmission and distribution of ultra-large city; Remote island, island load and passive network send field composition and division in a proportion such as electricity based on traditional DC transmission system of thyristor stronger competitiveness to be arranged, and many advantages such as modularized design are installed simple and convenient, and the compact conformation floor space is little; Save alternating current filter, fundamentally eliminated commutation failure.The success of the wind farm grid-connected demonstration project of U.S. Transbay engineering and Chinese Shanghai Nanhui puts into operation, and domestic and international a plurality of planning or establish using value and the development prospect that engineering has further been verified MMC-HVDC.
Yet present MMC-HVDC system still exists following two aspects not enough:
(1) can't effectively handle the DC side fault.When DC side breaks down; The full-controlled switch device antiparallel fly-wheel diode constitute the energy feeding loop that fault point and AC system directly are communicated with; Must it be cut off through the tripping AC circuit breaker, its shortcoming is mechanical response slow (needing 2～3 cycles at the soonest), so often need adopt complementary measures such as increase equipment nominal parameter, configuration high-speed by-pass switch; Therefore should topology and be not suitable for being prone to take place the overhead transmission line transmission of electricity of temporary faults such as flashover; Usually select for use to involve great expense but the low cable line of failure rate, so present stage MMC-HVDC is confined to cable to carry occasion, the shorter cost of distance is very high;
(2) ground connection branch road design, difficult installation.Tradition two level converters are generally drawn the ground connection branch road from DC side split capacitor mid point, thereby but the pattern that the brachium pontis of MMC adopts decentralized capacitance to arrange has been saved dc bus capacitor device group, and the design and installation of ground connection branch road is difficult to reference to the former way.
People such as Westerweller.T are Transbay cable-world ' s first HVDC system using multilevel voltage source converter (CIGRE Session.Paris at title; Frans:CIGRE; 2010; B4-101:1-7) having proposed a kind of in the article can be the technology that current conversion station provides reference potential at the reactance arm of MMC valve side installation three-phase Y-connection; Adopt this technological DC transmission system shown in Fig. 1 (a), this technology reactance parameter is selected comparatively difficulty, and has greatly influenced the reactive power operation scope of converter own.
People such as Zhao Cheng Yong are modularization multi-level converter HVDC DC side Fault Control protection strategy (Automation of Electric Systems at title; 2011; 35 (23): proposed the big resistance clamp of a kind of DC side earthing mode in article 82-87); The DC transmission system that adopts this earthing mode is shown in Fig. 1 (b), but that this earthing mode and resistance parameter are chosen is closely related, and to obtain too small then steady operation loss bigger when resistance; To obtain excessive then whole system approximate earth-free when resistance, system insulation cooperated have relatively high expectations.
All do not spell out in above-mentioned two kinds of prior aries at DC side configuration smoothing reactor, therefore need to increase brachium pontis reactor parameter and suppress DC side fault current climbing; And can only operate in the pattern that is made up of bipolar operation single voltage source converter, the back is that whole system is stopped transport with regard to bipolar stoppage in transit very easily takes place in case DC line breaks down, and system reliability is lower.
Summary of the invention
To the above-mentioned technological deficiency of existing in prior technology, the invention provides a kind of bipolar direct current transmission system with direct current fault self-cleaning ability, can handle the direct current fault certainly, and the ground connection branch road to choose design easy, system reliability is high, cost is low.
A kind of bipolar direct current transmission system with direct current fault self-cleaning ability comprises two converters; Wherein, the positive and negative terminal of first converter links to each other with the positive and negative terminal of second converter through two DC power transmission lines respectively;
Described converter is made up of anodal convertor unit and negative pole convertor unit; One end of anodal convertor unit is the anode of converter, and the other end links to each other with an end of negative pole convertor unit and ground connection; The other end of negative pole convertor unit is the negative terminal of converter.
Preferably, described anodal convertor unit and negative pole convertor unit are in series or in parallel to form by several MMC (modularization multi-level converter); Wherein, the MMC in first converter is connected in through converter transformer and send end three-phase alternating current electrical network, and the MMC in second converter is connected in through converter transformer and is held the three-phase alternating current electrical network; Can be adapted at the direct current transportation under different electric pressures, the different capabilities.
Preferably, described DC power transmission line is an overhead wire; Inexpensive has excellent engineering using value and potentiality.
Preferably, all be connected with smoothing reactor between the positive and negative terminal of described converter and the DC power transmission line; Can stabilize the ripple in the direct current, prevent that steep wave shock wave that DC power transmission line produces from getting into converter and causing device to suffer overvoltage and damage, avoid discontinuous current simultaneously.
Described converter transformer is that the mode of connection is Y
0The two winding transformer of/Δ.
Preferably, described MMC is three-phase six brachium pontis structures; Wherein, each brachium pontis is made up of a reactor and several change of current modules, several change of current modules series connection afterwards through reactor and converter transformer corresponding one mutually port join; The three-phase alternating current of its output has very little harmonic content, needs any filter hardly, and its architectural characteristic greatly reduces the switching frequency of device simultaneously, and then reduces loss, and control flexibly.
Further preferably, described change of current module is CDSM (a clamp Shuangzi module); Can utilize the diode reverse blocking ability to realize direct current locking process through blocking the trigger impulse of all switching tubes between the direct current age at failure.
Described CDSM is made up of five switching tubes, two electric capacity and two diodes; Wherein, The source electrode of switch transistor T 1 links to each other with the drain electrode of switch transistor T 2 and constitutes the end of CDSM; The drain electrode of switch transistor T 1 links to each other with the negative electrode of diode D6 and an end of capacitor C 1; The source electrode of switch transistor T 2 links to each other with the other end of capacitor C 1, the negative electrode of diode D7 and the source electrode of switch transistor T 5; The drain electrode of switch transistor T 5 links to each other with the anode of diode D6, an end of capacitor C 2 and the drain electrode of switch transistor T 3, and the source electrode of switch transistor T 3 links to each other with the drain electrode of switch transistor T 4 and constitutes the other end of CDSM, the anode of the source electrode of switch transistor T 4 and diode D7 and the other end of capacitor C 2; The grid of described switching tube receives the switching signal that external equipment provides.
Described switching tube is IGBT (insulated gate bipolar transistor).
Operation principle of the present invention is: the three-phase alternating current that send the end AC system is through the conversion of converter transformer electric pressure; Realize the ac/dc conversion by the MMC in the first converter both positive and negative polarity unit; After being stabilized ripple by reactor then, be transported to through DC power transmission line and held current conversion station, again through the flat ripple of reactor; Realize the AC/DC conversion through the MMC in the second converter both positive and negative polarity unit, finally conversion is delivered to energy and is held AC system through the converter transformer electric pressure.
Useful technique effect of the present invention:
(1) the present invention can be through to the converter quick control, realizes that the direct current fault removes and the restarting of the fault utmost point fast, during need not AC circuit breaker and move.
(2) the present invention adopts the dipolar configuration form, only needs the locking fault utmost point during direct current fault usually, and does not almost influence perfecting the utmost point, thereby improved system reliability.
(3) the present invention draws ground connection in the middle of adopting, and is easy to system's built by separate periods and increase-volume enlarging, and the one pole that puts into operation earlier puts into operation bipolar again, helps bringing into play early returns of investment; The ground connection branch road provides the current reflux path for the system under the big earthed return operational mode of one pole simultaneously, and the electric current of ground connection branch road is very little during balance movement.
(4) operational mode of the present invention is flexible, can be fit to direct current transportation under different electric pressures, the different capabilities; Can under operational modes such as bipolar balance, bipolar imbalance, the big earthed return of one pole, one pole metallic return, carry out, flexible operation is various.
Description of drawings
Fig. 1 (a) adopts the structural representation of the DC transmission system of AC side star reactance grounded mode for prior art.
Fig. 1 (b) adopts the structural representation of the DC transmission system of DC side clamp resistance earthing for prior art.
Fig. 2 is the structural representation of DC transmission system of the present invention.
Fig. 3 is the structural representation of convertor unit.
Fig. 4 is the structural representation of MMC.
Fig. 5 is the structural representation of CDSM.
The anodal convertor unit power response of first converter curve synoptic diagram when Fig. 6 (a) is the value and power reference step.
First converter negative pole convertor unit power response curve synoptic diagram when Fig. 6 (b) is the value and power reference step.
First converter negative pole convertor unit direct voltage response curve sketch map when Fig. 6 (c) is the value and power reference step.
Fig. 7 (a) is the schematic equivalent circuit of CDSM in correct time for working as fault current.
Fig. 7 (b) is the schematic equivalent circuit as fault current CDSM when bearing.
Fig. 7 (c) is the schematic equivalent circuit when MMC is in the locking process when electrode line short circuit earth fault takes place.
Fig. 8 is the control timing sketch map of converter after the DC side fault.
Fig. 9 (a) is anodal line-to-ground fault and the anodal convertor unit power response of first converter curve synoptic diagram when restarting.
Fig. 9 (b) is the anodal line-to-ground fault and the first converter negative pole convertor unit power response curve synoptic diagram when restarting.
Fig. 9 (c) is anodal line-to-ground fault and the anodal convertor unit direct voltage of first converter response curve sketch map when restarting.
Embodiment
In order to describe the present invention more particularly, technical scheme of the present invention and relative theory thereof are elaborated below in conjunction with accompanying drawing and embodiment.
As shown in Figure 2, a kind of bipolar direct current transmission system with direct current fault self-cleaning ability comprises two converters: first converter and second converter.
Converter is made up of anodal convertor unit and negative pole convertor unit; One end of anodal convertor unit is the anode of converter, and the other end links to each other with an end of negative pole convertor unit and ground connection; The other end of negative pole convertor unit is the negative terminal of converter;
The positive and negative terminal of first converter links to each other with the positive and negative terminal of second converter through two overhead wires respectively, and all is connected with smoothing reactor between the positive and negative terminal of two converters and the overhead wire;
As shown in Figure 3, in this execution mode, anodal convertor unit and negative pole convertor unit constitute by n MMC series connection; Wherein, the MMC in first converter is connected in through converter transformer and send end three-phase alternating current electrical network, and the MMC in second converter is connected in through converter transformer and is held the three-phase alternating current electrical network.
As shown in Figure 4, MMC is three-phase six brachium pontis structures; Wherein, each brachium pontis is made up of a reactor and m CDSM, several CDSM series connection back through reactor and converter transformer corresponding one mutually port join; In this execution mode, converter transformer is that the mode of connection is Y
0The two winding transformer of/Δ.
N and m are the natural number greater than 0.
As shown in Figure 5, CDSM is made up of five switch transistor T 1～T5, two capacitor C 1～C2 and two diode D6～D7; Wherein, The source electrode of switch transistor T 1 links to each other with the drain electrode of switch transistor T 2 and constitutes the end of CDSM; The drain electrode of switch transistor T 1 links to each other with the negative electrode of diode D6 and an end of capacitor C 1; The source electrode of switch transistor T 2 links to each other with the other end of capacitor C 1, the negative electrode of diode D7 and the source electrode of switch transistor T 5; The drain electrode of switch transistor T 5 links to each other with the anode of diode D6, an end of capacitor C 2 and the drain electrode of switch transistor T 3, and the source electrode of switch transistor T 3 links to each other with the drain electrode of switch transistor T 4 and constitutes the other end of CDSM, the anode of the source electrode of switch transistor T 4 and diode D7 and the other end of capacitor C 2; The grid of described switching tube receives the switching signal that external equipment provides; Switching tube adopts IGBT in this execution mode.
In this execution mode, the MMC in first converter all adopts and decides active power and decide Reactive Power Control, and the MMC in second converter all adopts and decides direct voltage and decide Reactive Power Control; The Switching Strategy of CDSM adopts phase-shifting carrier wave modulation and capacitance voltage balance policy.
During this execution mode operate as normal, the power delivery direction is by sending end three-phase alternating current electrical network to being held the three-phase alternating current electrical network.MMC control active power and reactive power in first converter become direct current through the AC/DC conversion with three-phase alternating current; Direct current flows out from the anode of first converter; Leveling through smoothing reactor makes direct current become level and smooth; Inject the anode of second converter through overhead wire; And flow out from the negative terminal of second converter, through overhead wire and smoothing reactor, finally flow back to the negative terminal of first converter; Carrying the direct current of coming from first converter is that final injection of three-phase alternating current held the three-phase alternating current electrical network through the straight/exchange conversion of second converter, thereby realizes from sending end three-phase alternating current electrical network to being held three-phase alternating current electrical network transmission power.
In order further to verify the validity and the feasibility of this execution mode, in the PSCAD/EMTDC of electromagnetic transient in power system simulation software, build corresponding model, concrete simulation parameter: nominal parameter ± 300kV (kilovolt)/1kA (kilo-ampere)/600MW (megawatt); Sending the electric pressure of end three-phase alternating current electrical network is 110kV, capacity of short circuit 20kA, and system reactance is 8 with the ratio of system resistance; The electric pressure of being held the three-phase alternating current electrical network is 220kV, capacity of short circuit 40kA, and system reactance is 8 with the ratio of system resistance; System reactance is 0.01H (henry), and each converter is connected with two two winding transformers, and transformer all adopts Y
0/ Δ connected mode is connected in the MMC of anodal convertor unit and negative pole convertor unit respectively; The converter transformer no-load voltage ratio of first converter is 110kV/171.8kV, and capacity is 375MVA (megavolt-ampere), and leakage reactance is 0.1pu (per unit, a mark one); The converter transformer no-load voltage ratio of second converter is 220kV/171.8kV, and capacity is 375MVA, and leakage reactance is 0.1pu; Each MMC adopts 18 CDSM, does not consider redundancy, and every have 6 CDSM mutually, each 3 CDSM of upper and lower bridge arm, and the CDSM dc capacitor is 1200uF (microfarad), and rated voltage 50kV, switching device all adopt desirable device, and the reactor of every brachium pontis series connection is 0.04H.DC power transmission line is the overhead wire of 300km (kilometer); Analyzing and contrast for convenient, is the fiducial value of mark one system with capacity 300MVA, 300kV.
Emulation sight 1: the switching of operational mode.
This emulation sight explains that mainly this execution mode has flexile operating condition.System initial state is that the anodal convertor unit and the negative pole convertor unit active power reference value of first converter is 0.8pu, and reactive power reference qref is 0.3pu; The anodal convertor unit of second converter and the idle reference value of negative pole convertor unit are 0.3pu.With first converter is research object, the anodal convertor unit reference instruction P that gains merit
RefFrom 0.6pu--0.4pu--0.2pu--0pu a series of transition take place, the negative pole convertor unit reference instruction P that gains merit
RefA series of transition take place from 0.6pu--0.8pu--1.0pu--1.2pu.Simulate its bipolar balance movement-bipolar unbalanced operation-one pole operation (positive pole unit is out of service) operating mode successively, response curve is as shown in Figure 6.The anodal convertor unit power response of first converter curve synoptic diagram when wherein Fig. 6 (a) is the value and power reference step; First converter negative pole convertor unit power response curve synoptic diagram when Fig. 6 (b) is the value and power reference step; First converter negative pole convertor unit direct voltage response curve sketch map when Fig. 6 (c) is the value and power reference step; P represents active power, and Q represents reactive power, U
DcRepresent direct voltage.
From figure, can find out that the variable power between the positive and negative electrode convertor unit influences each other very little; During this time the direct voltage of negative pole convertor unit maintain all the time in the effect of its voltage controller-1.0pu near; Though fluctuation is arranged slightly but scope is no more than ± 0.02pu, this is that reason such as non-linear owing to the response time-delay of controller and system causes.Anodal convertor unit is received blocking order during t=1.4s, and its meritorious reactive power quickly falls to zero, need not the AC circuit breaker action and can realize extremely normally withdrawing from, during under the negative pole convertor unit running overload to remedy the power disappearance as far as possible; Simulation waveform has verified that this execution mode all has good operation characteristic under various operating conditions.
Emulation sight 2: the DC side fault clearance and the fault utmost point restart.
One pole ground short circuit fault is the most incidental fault type of overhead transmission line transmission of electricity, and traditional DC transmission system makes rectifier get into inverting through forcing phase shift, makes arc road electric current and arc road voltage be reduced to zero realization DC side fault rapidly and eliminates fast.In view of reasons such as dc circuit breaker development difficulty and self topological features, the direct tripping AC circuit breaker and the converter of stopping transport almost are the unique feasible means of traditional MMC-HVDC after the fault.And this execution mode can make full use of the direct current locking function based on the MMC of CDSM, need not AC circuit breaker and just can effectively handle the DC side fault, and can the Rapid Realization fault utmost point restart.
In when, direct current fault or other special circumstances taking place needing CDSM to operate in the locking pattern when, then close the triggering signal of all IGBT through control system, utilize the reverse blocking capability of inverse parallel diode and clamping diode to accomplish the locking process fast.Fig. 7 (a) and Fig. 7 (b) have provided fault current i respectively
SMFor just with fault current i
SMThe equivalent circuit of CDSM under the locking pattern when negative.No matter can find out fault current i
SMInceptive direction how, all is charging for the module capacitance after the locking.The equivalent electric circuit of MMC is shown in Fig. 7 (c) during positive pole circuit failed because; With A, C is example mutually, supposes locking moment of fault current flow direction shown in Fig. 7 (c), U
Ap, U
CnBeing respectively A goes up brachium pontis mutually and descends brachium pontis cascade submodule capacitance voltage summation, U mutually with C
LnBe voltage difference between the MMC positive and negative terminal between age at failure.So when A, C realize the necessary condition of locking mutually is that the A that flows through goes up the current i of brachium pontis mutually
ApDescend the current i of brachium pontis mutually with the C that flows through
CnDrop to for zero moment and satisfy the condition of following formula, U
AcRepresent alternating voltage.Similarly, other between phase and phase various combination all satisfy as during the condition of A, C phase the just final completion locking of whole system.
Below just be based on the direct current locking mechanism of the MMC of CDSM, following surface analysis also designs converter control strategy and the action sequence between the direct current age at failure, and is to verify this execution mode in the advantage of handling the direct current fault, as shown in Figure 8.Occur to the system restoration operation from fault, be divided into following four-stage basically:
1. fault early period of origination (t
1～t
2): fault current is fed into AC system through brachium pontis, but because the electric parameters of fault detect does not reach the setting limit value as yet, the protection logical block is failure to actuate, and converter is still according to original state operation.
2. locking process (t
2～t
3): at t
2Fault detect constantly and the action of protection logical block; MMC to fault utmost point convertor unit sends blocking order; Controller cuts out the trigger impulse of all IGBT rapidly; Fault current will be accelerated the release of DC network energy through diode to storage capacitor charging and reduction rapidly, after fault current is reduced to zero, make MMC get into the complete atresia state by capacitance voltage and diode reverse blocking ability.When blocking order is sent, power controller correspondingly will be gained merit, the reference value of reactive power is reduced to zero or be negative value, make the energy that is stored in smoothing reactor and line inductance and the electric capacity feed back to AC system, to make a concentrated effort to finish the locking process.
3. circuit removes free process (t
3～t
4): when converter got into blocking fully, the overhead transmission line of fault deenergized, and kept this state continuance a period of time to be generally 0.2～0.5s, let arcing fault dissociate through fully going, and made insulation property return to previous level.
4. remaining system restarts (t
4～t
5): after fully going free process, the overhead transmission line of the fault utmost point has possessed the condition of normal transmission of electricity again.At t
4Release fault utmost point convertor unit and the fault logic unit resetted constantly.System climbs under the preset power ascending curve of power controller slowly, finally under the controller action of two ends, arrives stable operating point.
In the simulation model during hypothesis steady operation 1.2s the anodal overhead transmission line of system at 150km place the temporary transient metallic earthing short trouble of generation, duration 0.05s, convertor unit power, voltage response characteristic are as shown in Figure 9.
After fault took place, the brachium pontis electric current increased sharply, and supposed behind 2ms brachium pontis overcurrent protection logic activation and sent blocking order; Then the DC network energy will feed back to AC network rapidly or will be stored in the brachium pontis module capacitance through brachium pontis, and direct voltage can exist small size vibration to discharge up to the circuit energy to finish, and MMC gets into blocking, about 1/4 cycle of whole locking process afterwards.Fault utmost point power delivery and direct voltage reduce to zero very soon during locking, keep the MMC blocking of fault utmost point convertor unit to continue 0.3s, so that circuit fully goes to dissociate.For remedy the power disappearance as far as possible, perfect utmost point overload 20% operation between age at failure.After line fault is removed, send unlock command, system is restarted, make simultaneously and perfect the utmost point and return to original steady operation level to the MMC of fault utmost point convertor unit.For this analogue simulation of pick up speed adopts is step response, does not carry out the climbing of power.Small size vibration can appear in the reason direct voltage owing to line charging when restarting, but under the effect of controller, tends towards stability; Whole process need not the AC circuit breaker action.
From above-mentioned concrete analysis and detailed simulating, verifying, can find out; This execution mode has clear in structure; Earth electrode is easy for installation, and can not cause too much running wastage, can Rapid Realization direct current fault self-cleaning function; And completion system rapidly restarts, and operational mode is flexible and varied, system reliability is high; Can present MMC-HVDC application be generalized to the overhead wire occasion from cable; So this execution mode also has the strength of competing with the conventional high-tension DC transmission engineering in high-power long distance power transmission occasion; Simultaneously with China electrical network in recent years the idea of development of " intelligent grid, low-carbon economy, environmental protection " match; Be incorporated into the power networks at new forms of energy; City power distribution, isolated island send a plurality of fields such as electricity to have wide development space; Be to promote regenerative resource such as large-scale wind generating to be incorporated into the power networks, to solve lonely load powerup issues far away such as down town power supply and island, offshore drilling platform, solve a kind of feasible program of many direct currents drop point receiving-end system short circuit ratio minor issue, have broad application prospects.
Claims (9)
1. the bipolar direct current transmission system with direct current fault self-cleaning ability comprises two converters; Wherein, the positive and negative terminal of first converter links to each other with the positive and negative terminal of second converter through two DC power transmission lines respectively; It is characterized in that:
Described converter is made up of anodal convertor unit and negative pole convertor unit; One end of anodal convertor unit is the anode of converter, and the other end links to each other with an end of negative pole convertor unit and ground connection; The other end of negative pole convertor unit is the negative terminal of converter.
2. the bipolar direct current transmission system with direct current fault self-cleaning ability according to claim 1 is characterized in that: described anodal convertor unit and negative pole convertor unit are in series or in parallel to form by several MMC; Wherein, the MMC in first converter is connected in through converter transformer and send end three-phase alternating current electrical network, and the MMC in second converter is connected in through converter transformer and is held the three-phase alternating current electrical network.
3. the bipolar direct current transmission system with direct current fault self-cleaning ability according to claim 1 is characterized in that: described DC power transmission line is an overhead wire.
4. the bipolar direct current transmission system with direct current fault self-cleaning ability according to claim 1 is characterized in that: all be connected with smoothing reactor between the positive and negative terminal of described converter and the DC power transmission line.
5. the bipolar direct current transmission system with direct current fault self-cleaning ability according to claim 2 is characterized in that: described converter transformer is that the mode of connection is Y
0The two winding transformer of/Δ.
6. the bipolar direct current transmission system with direct current fault self-cleaning ability according to claim 2 is characterized in that: described MMC is three-phase six brachium pontis structures; Wherein, each brachium pontis is made up of a reactor and several change of current modules, several change of current modules series connection afterwards through reactor and converter transformer corresponding one mutually port join.
7. the bipolar direct current transmission system with direct current fault self-cleaning ability according to claim 6 is characterized in that: described change of current module is CDSM.
8. the bipolar direct current transmission system with direct current fault self-cleaning ability according to claim 7 is characterized in that: described CDSM is made up of five switching tubes, two electric capacity and two diodes; Wherein, The source electrode of switch transistor T 1 links to each other with the drain electrode of switch transistor T 2 and constitutes the end of CDSM; The drain electrode of switch transistor T 1 links to each other with the negative electrode of diode D6 and an end of capacitor C 1; The source electrode of switch transistor T 2 links to each other with the other end of capacitor C 1, the negative electrode of diode D7 and the source electrode of switch transistor T 5; The drain electrode of switch transistor T 5 links to each other with the anode of diode D6, an end of capacitor C 2 and the drain electrode of switch transistor T 3, and the source electrode of switch transistor T 3 links to each other with the drain electrode of switch transistor T 4 and constitutes the other end of CDSM, the anode of the source electrode of switch transistor T 4 and diode D7 and the other end of capacitor C 2; The grid of described switching tube receives the switching signal that external equipment provides.
9. the bipolar direct current transmission system with direct current fault self-cleaning ability according to claim 8 is characterized in that: described switching tube is IGBT.
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| CN102938560A (en) * | 2012-10-19 | 2013-02-20 | 浙江大学 | Direct-current converter station based on bipolar structure |
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Application publication date: 20120725 |