CN204361682U - The full direct current energy collecting system of a kind of wind energy turbine set - Google Patents
The full direct current energy collecting system of a kind of wind energy turbine set Download PDFInfo
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Abstract
一种风电场全直流电能汇聚系统，由SRG系统及其DC变换电路、电力电子开关、电力线组成，多个SRG系统及其DC变换电路先串联组成一个支路，多个相同数量的SRG系统及其DC变换电路串联的支路间并联，不同支路的平行相邻的SRG系统及其DC变换电路之间通过电力电子开关进行同极性端连接；SRG系统及其DC变换电路由SRG系统、DC变换电路组成，SRG系统和DC变换电路连接；DC变换电路由电容C1、电容C2、电容C3、电阻R1、电阻R2、电阻R3、二极管VD、电力电子开关VT1、电力电子开关VT2、电力电子开关VT3、电抗器L组成。该系统结构简单、体积小、损耗小，发输电效益高成本低。
A wind farm full DC power convergence system, which is composed of SRG systems and their DC conversion circuits, power electronic switches, and power lines. Multiple SRG systems and their DC conversion circuits are first connected in series to form a branch circuit. Multiple SRG systems of the same number and The branches of its DC conversion circuit in series are connected in parallel, and the parallel adjacent SRG systems of different branches and their DC conversion circuits are connected with the same polarity terminals through power electronic switches; the SRG system and its DC conversion circuit are composed of SRG systems, Composed of DC conversion circuit, SRG system is connected with DC conversion circuit; DC conversion circuit consists of capacitor C1, capacitor C2, capacitor C3, resistor R1, resistor R2, resistor R3, diode VD, power electronic switch VT1, power electronic switch VT2, power electronic Composed of switch VT3 and reactor L. The system is simple in structure, small in size, low in loss, high in power generation and transmission efficiency and low in cost.
Description
Technical field
The present invention relates to wind power generation field, the switch reluctance generator being specifically related to adopt direct output of DC current energy is wind-driven generator, the simple wind energy turbine set electrical system of structure of full direct current energy convergence and direct current transportation.
Background technology
Along with the large-scale development of the disposable fossil resources such as oil, coal, the harm that energy crisis and ecological deterioration cause is increasingly serious, and the unique channel that solve this difficult problem is exactly accelerate the exploitation to sustainable resource.In existing regenerative resource, no matter scale, or availability, wind energy is all one of the highest resource, and wind energy is utilizing in process and need not consume mineral resources, not discharge harmful, is considered as cleaning, the energy of green, environmental protection by people.
The area that the one land wind energy resources of Xian Shi China enriches the most from Xinjiang to the Inner Mongol, this area's wind speed is stable, scarcely populated, is well suited for building Large Scale Wind Farm Integration.Over more than ten years, the wind energy development in these regions is very fast, but due to the electricity needs of near zone not high, a large amount of wind-powered electricity generations is difficult to digest nearby.If unnecessary wind-powered electricity generation will be transferred to the huge region of Southeast of electricity needs, the feature that wind electricity volatility is strong can make again difficulty and the cost aggravation of transmission, and threatens to power grid security.And on the other hand, east China seashore line length, wind energy resources is good, wind energy quality is good, possesses the resources supplIes of extensive development offshore wind farm, and mineral resources are deficient, electricity needs is huge, and offshore wind farm can receive nearby, therefore has broad prospects at this regional development offshore wind farm.
Another advantage of wind energy on the sea is that wind speed is higher, wind-force is more lasting, compares with land wind energy, and the wind speed in open marine site wants high 30%-40%, and greater coasting area wants high 15%-20%, can the electric energy of multiple 50%-70%; And the land space that can hold large-scale wind field has at present been difficult to find, the construction of extensive marine wind electric field has become the Main way of Wind Power Utilization.
Although the exploitation of people to wind-powered electricity generation has ISUZU company, mainly concentrate on land, the experience of building Large Scale Offshore Wind Farm compares shortage.The major defect of offshore wind farm is that to build the cost of pylon and platform (maritime transformer station) in the seawater high, the high in cost of production of maintenance operation, thus to Wind turbines and electric power transfer thereof efficient, stable, reliable request is higher, technically also has different Liquified gas tankers unsteady flow, transmission of electricity etc. are multinomial simultaneously.
The large-scale wind electricity unit of current power more than MW class is mainly based on double-fed asynchronous wind driven generator group with directly drive total power changing type permanent magnet synchronous wind generator group.Double-fed asynchronous wind driven generator group has good cost performance, but to the ride-through capability of electric network fault and enabling capabilities more weak, its driving-chain must have high power gearbox, and this proposes harsher requirement to the reliability and maintainability of unit.Directly drive total power changing type permanent magnet synchronous wind generator group grid-connected by frequency converter, stronger to the ride-through capability of electric network fault, there is certain support electrical network ability, avoid the maintenance workload of high power gearbox, reliability increases, but because its rotating speed is very low, along with the increase of power, the manufacturing process of multi-pole magneto alternator is complicated, and technical difficulty is large, and motor volume is large, cost is high, Attention problems cost is higher, and simultaneously along with the continuous increase of unit capacity, supporting big-power transducer is expensive further increases its use cost.
(Switched Reluctance Generator, is called for short: SRG) structure is simple switch reluctance generator, brushless on rotor, without winding, without permanent magnet.It is equivalent to a current source when running, and like this in certain range of speeds, output end voltage can not change along with the change of rotating speed, and this is very suitable for the wind energy conversion system of the variable-speed operation of current main-stream, can improve the utilization ratio of wind energy; The more important thing is that it directly sends as direct current, adapted to current offshore wind farm carries out electric power transfer trend needs in efficient direct current mode, eliminated rectification link.Due to these characteristics, SRG can realize higher generating efficiency under wind-force Direct driver, thus eliminates gear box, makes whole power generation system structure more succinct, reliable, the development trend of this also wind generator system just.And in running, SRG controllable parameter is many, as turn-on angle, hold-off angle control, Current cut control etc., can realize the control strategy of more complicated easily, control output dc voltage and electric current flexibly, also greatly reduce the technostress of low voltage crossing.Visible, SRG introduces offshore wind farm, meet the needs installing difficulty, the development of cost is high, maintaining is difficult offshore wind farm completely, i.e. the high efficiency conversion realizing wind energy, the simplicity of structure means the maintenance that higher reliability is less and lower installation cost and equipment purchase cost.
To switched reluctance machines carry out that the research of electric operation carries out comparatively early, be widely used in electric traction at present, needed four quadrant running governing system and realize in the system of high-efficiency operation in the velocity interval of broadness.But to the research of its generator operation characteristic, until late 1980s just paid attention to, and expand in the applications such as space flight starting/generator exploration research.
Desirable wind turbine generator should be can variable-speed operation, Direct driver, saves gear box, reduces unnecessary maintenance work.Weigh SRG accordingly, can find that SRG is used for wind power generation and has following concrete advantage: (1) SRG has excellent speed adjusting performance, and slewing range is wide, can adapt to the requirement of different wind speed, utilize wind energy more efficiently.(2) SRG efficiency when low cruise is high, by rational design, can save gear box, realizes the generating of wind energy conversion system Direct driver, thus improves the generating efficiency of whole system, improve the annual energy output of wind generator system, reduce cost of electricity-generating.(3) SRG manufactures simple, brushless on rotor, coil, does not need permanent magnetic material (rare earth material) etc., thus simplifies the structure, such that the reliability of motor is high, cost is low.(4) SRG is typical electromechanical integrated product, and control is flexible, controling parameters is many, can realize the control strategy of more complicated easily, controls direct voltage and the direct current of output flexibly.(5) SRG can send the direct current of voltage constant easily, and output voltage and rotating speed have nothing to do, and directly can be regulated by the controller of self, easily grid-connected during multiple stage generator operation.(6) between SRG phase winding without electric coupling, its fault-tolerant ability strengthens greatly, even if when phase shortage, still can maintenance work (more than three-phase).(7) power density of switched reluctance machines is high, and motor volume is little, is easy to installation and transportation, and resistance to elevated temperatures is good, the Jobs on the sea environment of very applicable wind power generation.(8) SRG has self-excitation ability, only needs the direct current excitation power supply of low capacity, just can set up operating voltage.In practical application, complementary system can be formed with storage battery, when wind-force is sufficient, SRG obtains excitation power supply from storage battery and generates electricity, and after setting up operating voltage, the electric energy sent is powering load on the one hand, charge a battery simultaneously, when wind-force is not enough, the energy storage of storage battery discharges, for load.These features make SRG should be suitable for use in very much in the occasion of wind power generation and offshore wind farm above.
In recent years, also have for the research and practice of wind power generation about SRG.Wherein, patent 1, CN 102223034 B, large-scalely directly drive switching magnetic-resistance wind-driven generator and machine set system thereof, 2013.04.10; 2, CN 101686034 B, based on the maximum power automatic tracking method of Switched Reluctance GeneratorUsed in Wind Energy Converter System, 2012.04.25; 3, CN 102427323 B, switching magnetic-resistance wind power system starts control and MPPT control method, 2013.10.30, make progress and patent of obtaining the authorization with regard to high power density large-scale SRG design and the startup of system, SRG wind power generation maximum power automatic tracking method and SRG wind power generation and maximal power tracing control aspect respectively.
In scientific research circle, about the research of wind-powered electricity generation in conjunction with SRG, also mainly focus on unit maximal power tracing aspect, such as: 1, bear stands new etc. a kind of switching magnetic-resistance wind-power generator maximal wind-energy tracking [J]. and electrotechnics journal, 2009,24 (11): 1-7; 2 .Differential evolution method-based output power optimisation of switched reluctance generatorfor wind turbine applications [J] the .IET Renew.Power Gener. such as Hedi Yahia, 2014,8 (7): 795-806; 3 .A Study on the Maximum Power Control Method of Switched Reluctance Generator for WindTurbine [J] the .IEEE TRANSACTIONS ON MAGNETICS such as Da-WoonChoi, 2014,50 (1).
But, also do not occur completely with regard to SRG system dc output transform and the research of wind energy turbine set full direct current energy convergence aspect be made up of many SRG system or practice.
Domestic and international research shows, (High-Voltage Direct Current is called for short: mode transferring electric power HVDC) is the most convenient economical for offshore wind farm to adopt high voltage direct current.And voltage converter (Voltage Source Converter, be called for short: HVDC (VSC-HVDC) VSC) controls flexibly with it, volume is little, possess the features such as black start-up ability, is particularly suitable for the connection being applied to marine wind electric field and electrical network.The wind field that the existing HVDC of utilization is connected with electrical network all adopts the mode setting up a transformer station at sea, because current offshore power generator is all alternating current generator, the AC transformer that will be connected by every platform alternating current generating sets first boosts to middle pressure, then focus on maritime transformer station and convert direct current conveying to, connect AC network by after the inverter inversion of transformer station on the bank.Its complex structure, electric energy needs through the conversion repeatedly between AC and DC.
The design feature of Wind turbines itself is then considered in some research, directly DC network can be formed after a unsteady flow, by DC parallel network, electric energy is focused on marine DC boosting transformer station, then by direct current transmission ashore transformer station, last another mistake becomes connection AC network, this reduces system complexity, but be only omitted step-up transformer.
Further research shows, directly be connected in series each Wind turbines of direct current then more economically, can without the need to step-up transformer and maritime transformer station, multiple low-pressure air group of motors becomes required high voltage direct current after directly connecting, then be directly transferred to land transformer station by subsea DC cable, this kind of mode has become the study hotspot that marine wind electric field electric energy converges at present.
Full direct current energy without maritime transformer station converges and HVDC research becomes development trend, main generator many employings permanent magnet direct-drive synchronous generator (PMSG) in the middle of this.Document: 1, Amir Parastar, Jul-Ki Seok.High-Power-Density Power Conversion Systemsfor HVDC-Connected Offshore Wind Farms [J] .Journal of Power Electronics, 2013, 13 (5): 737-745.2, N.Holtsmark, H.J.Bahirat, M.Molinas, et al.An all-DC offshore wind farm with series-connectedturbines:An alternative to the classical parallel AC model.IEEE Trans.Ind.Electron, 2013, 60 (6): 2420-2428.3, Thanh Hai Nguyen, Dong-Choon Lee, Chan-Ki Kim.ASeries-Connected Topology of a Diode Rectifier and a Voltage-Source Converter for an HVDCTransmission System [J] .IEEE TRANSACTIONS ON POWER ELECTRONICS, 2014, 29 (4): 1579-1584.4, EtienneVeilleux, Peter W.Lehn.Interconnection of Direct-Drive Wind Turbines Using a Series-ConnectedDC Grid [J] .IEEE TRANSACTIONS SUSTAINABLE ENERGY, 2014, 5 (1): 139-147.5, Li Xiang, Han Minxiao., offshore wind farm series connection multiterminal VSC-HVDC coordination control strategy [J]. electrotechnics journal, 2013, 28 (5): 42-48, 57. etc., focus on the wind energy turbine set topological structure and control aspect thereof that adopt DC series, each unit general is voluntarily through over commutation and DC/DC conversion, then obtain DC high voltage after all units connected in series of wind field and carry out delivery of electrical energy ashore transformer station, these documents mainly focus on structure and the control of DC/DC conversion, rectifier system, harmonic wave control, the aspects such as system coordination control, the great advantage of cascaded structure is except without maritime transformer station, be exactly very easily in control, but in order to cater to control need usually need to throw off some units that originally can generate electricity, power benefit reduces, in addition, because each province of China's especially southeastern coast, major part greater coasting area complicated geology, island are numerous, densely populated, and economic activity is very frequent, if place's submarine cable is forced to interrupt because destruction occurs for human factor or economic activity, then whole series connection wind field will interrupt supply of electric power, the marine wind electric field that especially offshore is far away, be not suitable for adopting series topology structure to converge electric energy.
And another kind is called the topological structure of direct current series parallel structure, overcome some shortcomings of simple DC series structure, reliability also increases, document: He great Qing. based on marine wind electric field and the control [D] thereof of DC series. Shanghai: Shanghai Communications University, 2013., comparatively deep research has been carried out to the problem such as method for designing, cooperation control of this topological structure.
But, no matter which kind of electric energy aggregation infrastructure is wind energy turbine set be, the generator that they adopt is still double-fed asynchronous or permanent magnet direct-drive is main alternating current generator, carry out direct current transportation, they all must there is rectification link, so neither converge and transmission system by full direct current energy truly.
Summary of the invention
According to above background technology, the present invention proposes a kind of wind energy turbine set especially marine wind electric field SRG export the simple translation circuit of electric energy as the unit of generator; And relevant wind energy turbine set direct current energy aggregation infrastructure, be defined as direct current series-parallel connection matrix structure, and by providing its basic control method and advantage with the comparative analysis of direct current series parallel structure.
Technical scheme of the present invention is:
The full direct current energy collecting system of a kind of wind energy turbine set, by SRG system and DC translation circuit thereof, electronic power switch, power line forms, it is characterized in that, multiple described SRG system and DC translation circuit thereof are first composed in series a branch road, in parallel between the branch road of the SRG system of multiple equal number and the series connection of DC translation circuit thereof, homopolar end connection is carried out by described electronic power switch between the parallel adjacent SRG system of different branch and DC translation circuit thereof, what make an exception is, the top circuit of full direct current energy collecting system and bottom circuit all do not have electronic power switch, electronic power switch is for often to leave, all connections all use described power line.
Described SRG system and DC translation circuit thereof are made up of SRG system, DC translation circuit, it is characterized in that, described SRG system is connected with described DC translation circuit.
Described DC translation circuit is by electric capacity C1, electric capacity C2, electric capacity C3, resistance R1, resistance R2, resistance R3, diode VD, electronic power switch VT1, electronic power switch VT2, electronic power switch VT3, reactor L forms, it is characterized in that, electric capacity C1 and electric capacity C2 connects the both positive and negative polarity of SRG system up and down respectively after connecting, resistance R1 and resistance R2 connects the both positive and negative polarity of SRG system up and down respectively after connecting, electric capacity C1 is connected with the middle series connection point of resistance R1 and resistance R2 with the middle series connection point of electric capacity C2, reactor L one end is connected with SRG system positive pole, the other end connects the anode of diode VD and the anode of electronic power switch VT1, electronic power switch VT3 and resistance R3 is in parallel with reactor L after connecting, wherein electronic power switch VT3 negative pole connects SRG system positive pole, negative terminal and the electronic power switch VT2 positive pole of diode VD are connected in series, electronic power switch VT2 negative pole connects electric capacity C3, and the other end of electric capacity C3 connects electronic power switch VT1 negative terminal and together connects the negative pole of SRG system.
Further, when wind energy turbine set run duration, when there is certain SRG system and the other reasons such as DC translation circuit fault or maintenance needs shutdown disengaging stopping generating thereof and power, by the closed action of corresponding electronic power switch, namely other normal SRG system and the DC translation circuit thereof and this SRG system and DC translation circuit parallel communication thereof of running making the adjacent legs in parallel with this SRG system and DC translation circuit thereof carry, now, normally closed in DC translation circuit during operation electronic power switch VT2 disconnects; The SRG system and the DC translation circuit thereof that add carrying can be one or more, and the circuitry number mostly being wind energy turbine set most deducts one.
Described DC translation circuit, its input direct voltage is exactly the output dc voltage of SGR system, during normal operation work, is changed, just can adjust its output dc voltage size by time of turning on and off electronic power switch VT1 and ratio.
The electronic power switch VT3 of DC translation circuit is normal open switch, and when electronic power switch VT2 disconnects, electronic power switch VT3 closes, and is the loop that reactor L provides energy to release, and is consumed by resistance R3.
Technique effect of the present invention mainly contains:
For the marine wind electric field of simple parallel-connection structure, generally maritime transformer station need be built; For the wind energy turbine set of mere in-line structure, although general without the need to building maritime transformer station, but consider each province of China's southeastern coast, most of greater coasting area complicated geology, island are numerous, densely populated, economic activity is very frequent, if place's submarine cable is forced to interrupt because destruction occurs for human factor or economic activity, then whole wind field will interrupt supply of electric power, especially the Large Scale Offshore Wind Farm that offshore is far away, is not suitable for adopting series topology to converge electric energy;
The full direct current energy collecting system of a kind of wind energy turbine set of the present invention, the different SRG system of adjacent of different branch and DC translation circuit thereof is adopted to pass through the interconnected direct current series-parallel connection matrix structure of electronic power switch, because SRG directly sends direct current, eliminate rectification link, simplify the structure and reduce cost and improve reliability, also therefore, the full direct current be only truly based on the direct current transportation wind power plant of SRG sends out transmission of electricity; And the advantage of direct current transportation is self-evident, the advantage that especially loss is little, it is also little that the direct current cables that the words under marine wind field environment adopt is layed in the pollution caused in seabed;
Overlap the certain boosting of SRG system and the series connection of DC translation circuit and DC translation circuit wherein thereof due to of the present invention more, every bar branch voltage and busbar voltage can obtain high pressure and can be directly used in electric power and be transported to transformer station and be connected with electrical network, if the words of marine wind electric field, then to maritime transformer station more without the need to asking, also without the need to step-up transformer, great amount of investment is saved;
Converge and transmission field at wind energy turbine set direct current energy at present, owing to being all almost alternating current generator, the output of every platform generator adopts first rectification often, then inversion and after adopting high frequency transformer to boost again rectification be direct current; Or generator is first step-up transformer boosting after sending alternating current, and then rectification isotype, and the former transformation of electrical energy is complicated, complex structure, and the latter is due to the bulky that exists of low-frequency transformer; And the DC translation circuit that the present invention proposes, structure is simple, compact, cost is low, simple installation, consider the controllability flexibly that SRG itself is unique and the regulating power of DC translation circuit to voltage itself, and the protective effect of electronic power switch VT2 during fault, so can not isolation link be considered;
In addition, consider high-power SRG, especially the more powerful SRG of marine wind field, the generator torque fluctuation problem that certain harmonic wave causes, due to the increase of power grade, the increase of generator volume weight and inertia, itself possesses certain level and smooth resistivity to torque ripple and is unlikely to cause damage to blade and mechanical driving device;
Under direct current series-parallel connection matrix structure of the present invention, bearing mode when fault or other factors are shut down, IGBT) effectively can reduce ceiling voltage, not waste required igbt and (be called for short: the quota voltage of electric component such as, improve and send out a transmission of electricity benefit; According to wind energy turbine set actual conditions, after the maximum shutdown quantity determining to allow or ratio, corresponding Bearer Control can be carried out in wind field runs, ensure that whole intact unit sends out transmission of electricity in the normal operation in wind speed range that can generate electricity.
Accompanying drawing explanation
Figure 1 shows that SRG system of the present invention and DC translation circuit figure thereof.
Figure 2 shows that wind energy turbine set structure chart of the present invention.
Figure 3 shows that direct current series parallel structure one compressor emergency shutdown bypass figure.
Figure 4 shows that direct current series parallel structure two compressor emergency shutdown bypass figure.
Figure 5 shows that direct current series parallel structure three compressor emergency shutdown bypass figure.
Figure 6 shows that the interconnected branch road carrying situation map of direct current series-parallel connection matrix structure three compressor emergency shutdown.
Figure 7 shows that the interconnected two branch road carrying situation maps of direct current series-parallel connection matrix structure three compressor emergency shutdown.
Figure 8 shows that the interconnected three branch road carrying situation maps of direct current series-parallel connection matrix structure three compressor emergency shutdown.
Figure 9 shows that maximum voltage Dynamic Simulation Results after the bypass of direct current series parallel structure compressor emergency shutdown.
Figure 10 shows that the interconnected rear maximum voltage simulation result of direct current series-parallel connection matrix structure three compressor emergency shutdown.
Figure 11 shows that the interconnected rear maximum current simulation result of direct current series-parallel connection matrix structure three compressor emergency shutdown.
In figure: 111, SRG system, 112, DC translation circuit, 11 ... mn, each SRG system and DC translation circuit thereof.
Embodiment
Be illustrated in figure 1 SRG system of the present invention and DC translation circuit figure thereof, be made up of SRG system (111) and DC translation circuit (112), direct current series-parallel connection matrix wind energy turbine set structure as shown in Figure 2, in the middle of 11 ..., mn is m × n identical SRG system and DC translation circuit thereof, K11 ..., K (m-1) (n-1) be the individual identical electronic power switch of (m-1) × (n-1) (K11 ..., K (m-1) (n-1)).
As shown in Figure 1, SRG system (111) enters DC translation circuit (112) after exporting direct current, electric capacity C1 and electric capacity C2 has voltage support, filtering, energy storage effect, resistance R1 and resistance R2 then plays voltage and the protective effect of balancing capacitance C1 and electric capacity C2, and provide bleed-off circuit for electric capacity C1 and electric capacity C2, resistance R1 and resistance R2 generally about 100M Ω rank, otherwise the too small words of resistance they are larger meritorious by consuming; And adopt electric capacity C1 and electric capacity C2 two capacitors herein, be consider raising reliability, just in case during a capacitance damage, the protection of resistance R1 or resistance R2 in addition, improves fault-tolerant ability, and circuit is endure within the scope of certain hour.
In DC translation circuit (112), during normal operation, electronic power switch VT2 is closure state, when electronic power switch VT1 closes, the direct current that SRG system (111) sends charges to reactor L, and the voltage support at electric capacity C3 two ends is outwards powered simultaneously; When electronic power switch VT1 disconnects, the electric energy that SRG system (111) output electric energy and reactor L store superposes jointly outwards powers and charges to electric capacity C3; The closed and disconnected action of electronic power switch VT1, according to time and the ratio of required output voltage values determination closed and disconnected; Because electric capacity C3 when electronic power switch VT1 turns off receives dual the providing from SRG system (111) and reactor L energy storage, under keeping switching frequency situation that electronic power switch VT1 is constant and enough large electric capacity C3 and reactor L prerequisite, DC translation circuit (112) output voltage along with the service time that electronic power switch VT1 is relative shorter, namely the turn-off time is longer, its output voltage is more bigger than the input voltage that SRG system (111) gives, thus reaches the object of boosting inverter.
When certain cover unit as shown in Figure 1 and SRG system and DC translation circuit failure and other reasons thereof need to stop sending out transmission of electricity; electronic power switch VT2 disconnects this unit and is carried by adjacent legs unit; now; electronic power switch VT3 in DC translation circuit closes simultaneously; consume the possible energy that can not distribute of reactor L by resistance R3, reactor L is played a protective role.
In order to wind energy turbine set Bearer Control mode and the advantage of the direct current series-parallel connection matrix structure of figuratively bright the present invention's proposition, the present embodiment carries out with the pattern compared with direct current series parallel structure wind field.Specific as follows:
For m × n=5 × 4 structure, as the wind field topology diagram that Fig. 3, Fig. 4, Fig. 5 are direct current series parallel structure, assuming that all SRG systems and DC translation circuit thereof (11,12 ..., 54) carry out MPPT maximum power point tracking control all voluntarily, run on rated point, each parameter rated point perunit value is 1pu.
Fig. 3 is that No. 31 units i.e. No. 31 SRG systems and DC translation circuit thereof is shut down, direct current series parallel structure when running into this situation, often adopt the method bypassing this 31 unit as shown in Figure 3, now we see because of parallel relationship, this No. 1 branch voltage is constant, the voltage that former 31 units are born all is assigned on other four units of same branch road, is respectively 1.25pu; Suppose that each unit voltage limits is 1.5pu, if this No. 1 branch road 31, No. 41 two units shut down bypass simultaneously, then other unit voltages of corresponding same branch road reach 1.667pu, have exceeded limit value, as shown in Figure 4; More serious, this No. 1 branch road 31,41,51 3 units shut down bypass simultaneously, then 11,21 intact units respectively will bear the more high voltage of 2.5pu, as shown in Figure 5; Therefore, when there is two and above unit bypass, can only be that the unit of originally intact series connection is also shut down to prevent from burning out associated electrical components; So; in the above conditions; be less than or equal on the every bar branch road of the series parallel topology structure qualification of 5 units connected in series and can only have at most a unit bypass; meet or exceed two units because of fault or other reasons as too low in wind speed or excessive need shut down time; can only be that all the other units of this branch road all exit power supply, then greatly reduce generating field benefit.One of solution improves the withstand voltage limit value of switching device selected, but this undesirably increases purchase cost, and in the IGBT of current main-stream highest voltage level be also no more than 7KV.
Between the unit of consideration mutual series connection, geographical position is close, wind speed is close, if when running into ultralow or superelevation wind speed, and the situation of off-grid while of often occurring connecting adjacent unit.So the present embodiment is for direct current connection in series-parallel and these two kinds of structures of direct current series-parallel connection matrix, specifically wherein one to several units are shut down the situation departing from power supply simultaneously and are possessed practical significance on a branch road.
The following is direct current series-parallel connection matrix of the present invention for maximum voltage amperometry during as above compressor emergency shutdown situation.
These three units of same consideration shut down situation simultaneously, 31,41,51 3 compressor emergency shutdowns as shown in Figure 6, and K switch 21 closes interconnected, and 32,42,52 units of the 2nd branch road carry three units of shutdown; Now maximum unit voltage is from non-interconnected unit, i.e. 11,12 units, is 1.429pu, maximum unit electric current from interconnected carrying unit, 1.4pu, total output current 3.4pu the same as Fig. 5, output voltage supports constant because of each branch road, thus gross output is also constant; And ceiling voltage 2.5pu during connection in series-parallel.The visible interconnected rear unit ceiling voltage of direct current series-parallel connection matrix structure the 2nd branch road of using instead reduces a lot, reduces the withstand voltage limit value of unit current transformer internal power electronic switch and other associated electrical components simultaneously, reduces cost.
And if successively pull the 3rd, 4 branch roads into carrying further, as shown in Figure 7 and Figure 8, K22 and K23 is successively closed, and ceiling voltage drops to 1.25pu and 1.176pu respectively, maximum current drops to 1.2pu and 1.133pu respectively, but gross output remains unchanged; Visible; the branch road of shutting down unit simultaneously interconnected is more; maximum current voltage drop amplitude is larger; but total power output still remains unchanged; so; by mode all interconnected between adjacent for the co-located of all branches unit after can adopting compressor emergency shutdown, minimum voltage and current limit value can be obtained, and export gross power not change compared with before interconnected.
From above analysis, after adopting direct current series-parallel connection matrix and corresponding control mode, reduce the highest voltage level selecting power device and other withstand voltage elements, provide cost savings; The some units comparing series parallel structure, because having to also make the intact compressor emergency shutdown of same branch road after fault or the shutdown of other factors, significantly improve power benefit.
To described example under above direct current series parallel structure and direct current hybrid connected structure, emulate.
Direct current series parallel structure, the 31 compressor emergency shutdown bypasses when 1s, add 41 compressor emergency shutdown bypasses during 3s, add 51 compressor emergency shutdown bypasses during 5s again, and namely as in Fig. 3, Fig. 4, Fig. 5 situation, Fig. 9 gives the dynamic simulation situation of maximum voltage, obtains checking.
Direct current series-parallel connection matrix structure, 31,41,51 3 units are shut down simultaneously, when 1s, unit is shut down in the adjacent unit carrying of the 2nd branch road, the 3rd branch road relevant position unit carrying is added during 3s, add the 4th branch road relevant position unit carrying during 5s again, namely as shown in Fig. 6, Fig. 7, Fig. 8, Figure 10 is the dynamic simulation situation of maximum voltage, obtain checking, much less than the direct current series parallel structure maximum voltage of Fig. 9; In addition, the dynamic simulation situation of maximum current shown in Figure 11 is seen, have also been obtained checking.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104332986A (en) * | 2014-11-25 | 2015-02-04 | 中国计量学院 | Full DC (Direct Current) electric energy converging system of wind power station |
| WO2019109271A1 (en) * | 2017-12-06 | 2019-06-13 | Abb Schweiz Ag | Voltage source converter system of hvdc system and rectifier and inverter stations associated therewith |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104332986A (en) * | 2014-11-25 | 2015-02-04 | 中国计量学院 | Full DC (Direct Current) electric energy converging system of wind power station |
| WO2019109271A1 (en) * | 2017-12-06 | 2019-06-13 | Abb Schweiz Ag | Voltage source converter system of hvdc system and rectifier and inverter stations associated therewith |
| CN111433994A (en) * | 2017-12-06 | 2020-07-17 | Abb电网瑞士股份公司 | Voltage source converter system for HVDC system, and associated rectifying and inverting station |
| US11894684B2 (en) | 2017-12-06 | 2024-02-06 | Hitachi Energy Ltd | UHVDC converter transformer re-usage for LCC to VSC upgrade |
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