CN102427243B - Multi-terminal DC (Direct Current) power transmission system for combined synchronization of wind power plant and conventional power plant - Google Patents
Multi-terminal DC (Direct Current) power transmission system for combined synchronization of wind power plant and conventional power plant Download PDFInfo
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- CN102427243B CN102427243B CN201110335121.8A CN201110335121A CN102427243B CN 102427243 B CN102427243 B CN 102427243B CN 201110335121 A CN201110335121 A CN 201110335121A CN 102427243 B CN102427243 B CN 102427243B
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Abstract
The invention discloses a multi-terminal DC (Direct Current) power transmission system for combined synchronization of a wind power plant and a conventional power plant. The multi-terminal DC power transmission system comprises two rectification stations and an inversion station, wherein the wind power plant is connected to an AC (Alternating Current) bus side of one rectification station, the conventional power plant is connected to an AC bus side of the other rectification station, the inversion station is connected to a load center, DC buses of the two rectification stations, corresponding to the inversion station, are connected together by a DC power transmission line, thus the multi-terminal DC power transmission system is formed. According to the multi-terminal DC power transmission system disclosed by the invention, a matched conventional power plant does not need to be built near the wind power plant, and the multi-terminal DC power transmission system has no any requirements on a geographic position of the conventional power plant combined with the wind power plant; compared with a manner of AC power grid synchronization, the multi-terminal DC power transmission system does not need a local AC power grid near the wind power plant to level the power fluctuation of wind power; and compared with a scheme of synchronization of wind power plant through voltage source type DC power transmission, the multi-terminal DC power transmission system can enable the electricity transmission power of a single-circuit bipolar line to be 6,400MW or more by adopting the traditional mature ultra-high-voltage current conversion technology.
Description
Technical field
The invention belongs to electric power system power transmission and distribution technical field, be specifically related to wind power generation through the extensive remote grid-connected application technology of direct current transportation.
Background technology
According to national Wind Power Development planning, Hami, Jiuquan, Hebei, Jilin, jiangsu coast, Meng Dong, seven ten million kilowatt of wind-powered electricity generation bases, illiteracy west will be built up in the year two thousand twenty, be planned for 2015 and build up 5,808 ten thousand kilowatts, the year two thousand twenty builds up 9,017 ten thousand kilowatts, accounts for national wind-powered electricity generation total installation of generating capacity 78% left and right.
Because wind-powered electricity generation total installation of generating capacity is huge, each base is all by titled with " land Three Gorges " title.But unmatchedly with total installation of generating capacity be, most of wind-powered electricity generation base is positioned at NORTHWEST CHINA area, local AC network power load is low, self dissolve a little less than ability, wind energy resources and load center are contrary distribution, have determined that most of wind power generation need to make it at central and east load center, dissolve through extensive long distance power transmission.Extra-high voltage direct-current transmission is a kind of current techique of realizing extensive long distance power transmission.
Hour, wind power generation is generally by exchanging and net mode directly accesses local AC network in wind energy turbine set installed capacity.When wind energy turbine set installed capacity reaches tens million of kilowatt hours, because wind energy turbine set is generally positioned at remote districts, local AC network rack is weak, and wind energy turbine set is brought stability problem through exchanging grid-connected meeting to local AC network, and the disturbance that local AC network occurs etc. also can affect the stable operation of wind energy turbine set.
Wind power generation has stronger fluctuation, and central and east load center can not be accepted the electric power of fluctuation, and for this reason, wind power generation needs and thermal power generation, hydroelectric power generation, and pumped storage, thus the associatings such as energy storage power plant provide electric weight stably for central and east load center.
Xiao creates the people's such as English " research of Jiuquan wind power regulative mode " (Proceedings of the CSEE, 2010,30 (10), 1～7) mentioned a kind ofly in Jiuquan area auxiliary construction fired power generating unit, by UHVDC Transmission Lines, wind power generation has been combined to the scheme that is transported to central and east load center with thermal power generation.Wherein the installed capacity of supporting fired power generating unit is 1.6～2.0 times of wind power generation installed capacity.
The people's such as Chen Xia " the wind-electricity integration technology based on multi-terminal HVDC transmission " (electrotechnics journal, 2011,26 (7)) proposed a kind of four end DC transmission system of utilizing and two trans-regional wind energy turbine set has been transported to the scheme of two load centers.Concrete system is: set up Liang Ge converting plant, 2, two Inverter Station of converting plant 1 and converting plant, Inverter Station 1 and Inverter Station 2; Converting plant 1 and Inverter Station 1, converting plant 1 and converting plant 2, the DC bus of converting plant 2 and Inverter Station 2 is linked together by a DC transmission line respectively; Two trans-regional wind energy turbine set access to respectively on the ac bus of converting plant 1 and converting plant 2, and converting plant 1 and converting plant 2 connect with local AC network separately respectively simultaneously.
US2010091527 provides a kind of scheme of utilizing voltage-source type converter tap load from the direct current transportation of traditional two ends.This scheme is set up a voltage-source type circulator on the direct current transportation of traditional two ends is along the line, utilizes voltage-source type converter tap load DC power transmission line.
Above-mentioned Xiao creates the people's such as English scheme owing to needing the fired power generating unit of 1.6～2 times of installed capacity of wind-driven powers of auxiliary construction, its effects of energy saving and emission reduction allows of no optimist, that the target for energy-saving and emission-reduction that will reach with development wind-powered electricity generation deviates from mutually, this scheme requires to have the geographical conditions of building large electric power plant unit near wind energy turbine set simultaneously, and most of land wind energy turbine set is positioned at the remote districts of lack of water, and be not suitable for building fired power generating unit.The people's such as Chen Xia scheme still needs local AC network to stabilize wind power fluctuation, as broad as long through local AC network with wind power generation in essence, wind energy turbine set is brought stability problem through exchanging grid-connected meeting to local power grid, and the disturbance that local power grid occurs etc. also can affect the stable operation of wind energy turbine set.When the scheme in US2010091527 is used for transmitting wind power generation, require the voltage withstand class of voltage-source type converter and the electric pressure of traditional two ends DC transmission line to match, there is no at present the voltage-source type converter technology that reaches this electric pressure.
Summary of the invention
For the deficiencies in the prior art, technical problem to be solved by this invention is without local AC network, to stabilize under the prerequisite of wind power fluctuation, and wind energy turbine set provides jumbo steady electric energy for load center.
For solving above-mentioned problems of the prior art, the invention provides and a kind of wind energy turbine set and conventional power plant are combined to grid-connected multi-terminal HVDC transmission system, in this transmission system, wind energy turbine set is attached directly to converting plant, without local AC network, stabilize wind power fluctuation, the conventional power generation usage factory geographical position of combining with wind energy turbine set is unrestricted, can be away from the existing conventional power plant of wind energy turbine set or newly-built conventional power plant in place.
The present invention solves its technical problem and adopts following technical scheme:
A kind of wind energy turbine set and conventional power plant are combined to grid-connected multi-terminal HVDC transmission system, comprise Liang Ge converting plant, an Inverter Station, it is characterized in that, described wind energy turbine set is attached to the ac bus side of the first converting plant wherein, and described conventional power plant is attached to the ac bus side of the second converting plant wherein, and described Inverter Station is attached to load center, and described Liang Ge converting plant and DC bus corresponding to Inverter Station are linked together by DC power transmission line, form multi-terminal HVDC transmission system
Two converting plants and Inverter Station all adopt the current source type commutation technique of technology maturation, can reach ± 800kV of its rated voltage, and rated power can reach 6400MW, is applicable to realizing the remote conveying of wind power generation and conventional electric power.
Further, can adopt kinds of schemes to provide interchange commutation voltage for converting plant 1, comprise and adopt STATCOM to provide interchange commutation voltage to the first converting plant, adopt synchronous compensator to provide interchange commutation voltage to the first converting plant, or adopt near local AC network wind energy turbine set to provide interchange commutation voltage to the first converting plant.
The starting method that the invention allows for above-mentioned multi-terminal HVDC transmission system, specifically comprises:
1) by the second converting plant and Inverter Station, by the Starting mode of traditional two ends direct current transportation, set up the direct voltage of multi-terminal HVDC transmission system;
2), by STATCOM, synchronous compensator or local AC network are set up the first converting plant and are exchanged commutation voltage;
3) wind energy turbine set is carried out asynchronous switch-on operation;
4) the first converting plant release, active power of wind power field rises to the maximum corresponding with current wind speed by certain slope simultaneously;
5) drop into the power control loop of determining of Inverter Station, completion system starts.
Compared with prior art, novelty of the present invention and creativeness are embodied in:
1) compare with the direct current transportation of traditional two ends, native system Duo Liaoyige converting plant, can be connected on wind energy turbine set and conventional power plant respectively in Liang Ge converting plant, and the associating that realizes wind energy turbine set and conventional power plant is grid-connected;
2) the interchange commutation voltage of the first converting plant is provided by STATCOM, and wind energy turbine set AC network not adjacent thereto connects, between wind energy turbine set and sending end AC network without any impact;
3) compare through the high voltage direct current transmission interconnection technology based on voltage source converter with wind energy turbine set, the present invention is with current source type converter transmitting active power, and its electric pressure and power grade can be done very highly;
Beneficial effect of the present invention is mainly:
Than the direct current transportation of traditional two ends, the present invention need to not build the supporting conventional power plants such as thermal power plant near wind energy turbine set, without any requirement to the geographical position of the conventional power plant of combining with wind energy turbine set, facilitates distributing rationally of resource; Than the grid-connected mode of AC network, the present invention does not need near local AC network wind energy turbine set to stabilize wind power fluctuation, and wind energy turbine set does not affect the stability of its local AC network; Than wind energy turbine set through the grid-connected scheme of voltage-source type direct current transportation, this scheme can adopt the extra-high voltage converter technology of current technology maturation, single time bipolar line transmitted power can reach 6400MW, distance can reach 2000km and more than, can reach ± 800kV of electric pressure, and the HVDC Transmission Technology of employing voltage-source type converter, by 2010, a DC transmission engineering of transmitted power maximum, its power is 400MW, transmission distance 970km, electric pressure is ± 200kV.Adopt the present invention to transmit wind power generation, the structure of existing electrical network and operational mode change without making substantially, the present invention can be used as after the two ends direct current transportation of the remote conventional large power supply of transmission, and a kind of point that is exclusively used in the generating of transmission large-scale wind is to netting basic power delivery mode.
Accompanying drawing explanation
Fig. 1 adopts STATCOM that the multi-terminal HVDC transmission service system that exchanges commutation voltage is provided to converting plant 1;
Fig. 2 adopts synchronous compensator that the multi-terminal HVDC transmission service system that exchanges commutation voltage is provided to converting plant 1;
Fig. 3 adopts local AC network that the multi-terminal HVDC transmission service system that exchanges commutation voltage is provided to converting plant 1;
The waveform of each physical quantity when Fig. 4 is scheme 1 startup;
The waveform of each physical quantity when Fig. 5 is scheme 1 wind power fluctuation.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
See Fig. 1, a kind ofly wind energy turbine set and conventional power plant are combined to grid-connected multi-terminal HVDC transmission system comprise altogether Liang Ge converting plant and an Inverter Station.A plurality of wind energy turbine set are by transmission line X1 in wind energy turbine set separately, step-up transformer T1 and transmission line X2 are connected on the ac bus of converting plant 1, conventional power plant is attached on the ac bus of converting plant 2, Inverter Station ac bus is attached to load center, converting plant 1, the positive and negative DC bus of converting plant 2 and Inverter Station is linked together by DC line accordingly, forms a multi-terminal HVDC transmission system.In this system, be connected in the power fluctuation that conventional power plant in converting plant 2 can be stabilized wind energy turbine set, wind energy turbine set can be considered a large power supply after combining with conventional power plant, for load center provides steady electric energy.
Traditional two-terminal direct current transmission system contains bipolarity wiring, 3 kinds of modes of connection such as same polarity wiring and unipolarity wiring, and this multi-terminal HVDC transmission system also contains bipolarity wiring similarly, 3 kinds of modes of connection such as same polarity wiring and unipolarity wiring.What Fig. 1 provided is the bipolarity mode of connection.
The conventional power plant that the interchange commutation voltage of converting plant 2 is connected by it provides, and the interchange commutation voltage of Inverter Station is provided by load center, and the interchange commutation voltage of converting plant 1 has multiple presentation mode, respectively: scheme one, provides by STATCOM; Scheme two, provides and scheme three by synchronous compensator, by local AC network, provides.
Utilize STATCOM to provide while exchanging commutation voltage to converting plant 1, wind energy turbine set AC network decoupling zero local with it, the power fluctuation of wind energy turbine set can not affect local AC network, the disturbances such as fault that local AC network occurs on wind energy turbine set also without affecting.
Utilize synchronous compensator to provide and exchange commutation voltage wiring as shown in Figure 2 to converting plant 1, except converting plant 1 exchanges commutation voltage presentation mode and scheme one have any different, the current conversion station that this scheme comprises and the mode of connection and scheme one are in full accord.Similar with Fig. 1, in this scheme, the also AC network decoupling zero local with it of wind energy turbine set.
Utilize local AC network to provide and exchange commutation voltage wiring as shown in Figure 3 to converting plant 1, except converting plant 1 exchanges commutation voltage presentation mode and scheme one have any different, the current conversion station that this scheme comprises and the mode of connection and scheme one are in full accord.In order to reduce the impact of wind energy turbine set power fluctuation on local AC network, can make the active power of converting plant real-time tracking wind energy turbine set output, make local AC network not participate in stabilizing wind power, only utilize local AC network to provide interchange commutation voltage to wind energy turbine set.
Adopt following operation start system:
When initial, locking converting plant 1, converting plant 2, the trigger impulse of Inverter Station 1, wind energy turbine set circuit breaker is in cut-offfing state.Some time inscribes and sends out after enabled instruction, by following sequential, starts system:
1) current instruction value of given converting plant 2 and Inverter Station is the load current value of converting plant 2 under rated condition, the trigger impulse of release converting plant 2 and Inverter Station, the trigger impulse of continuation locking converting plant 1.Converting plant 2 and Inverter Station are set up the direct voltage of multi-terminal HVDC transmission according to the start-up course of traditional two ends direct current transportation;
2), by STATCOM, synchronous compensator or local AC network are set up converting plant 1 and are exchanged commutation voltage;
3) wind energy turbine set detect the interchange commutation voltage amplitude of converting plant 1 and frequency substantially maintain constant after, carry out asynchronous switch-on operation;
4) after the success of wind energy turbine set asynchronous switch-on, wind power command value rises to the value corresponding with current wind speed by certain slope, the trigger impulse of meanwhile release converting plant 1, and the current instruction value of Inverter Station also rises by certain slope accordingly;
5) through after a period of time, the direct current power of converting plant 1 reaches the maximum wind performance number corresponding with current wind speed, drops into the power control loop of determining of Inverter Station, and completion system starts.
For verifying correctness of the present invention, utilize the international direct current transportation PSCAD/EMTDC of simulation software to build the simulation example corresponding with scheme one and carry out simulating, verifying.In simulation example, converting plant 1, converting plant 2, the switching device of STATCOM adopts the detailed switch model in PSCAD/EMTDC master pattern storehouse, for improving computational speed, a wind turbine generator modeling that waits capacity for a plurality of wind energy turbine set, but its frequency converter still adopts detailed switch model modeling.Due to the primary equipment model of simulation example detailed switch model buildings in master pattern storehouse all, the result of emulation experiment gained is highly believable.Fig. 4 and Fig. 5 have provided the simulation experiment result.The waveform of each physical quantity when Fig. 4 is the startup of multi-terminal HVDC transmission system; The waveform of each physical quantity when Fig. 5 is wind power fluctuation.For convenience of contrast, direct voltage and direct current power be standardization all, and the fiducial value of direct voltage is 800kV, converting plant 1, and converting plant 2, the fiducial value of Inverter Station direct current power is respectively 2000MW, 1500MW and 3200MW.
In emulation experiment process, each main operating time node is:
0.04s: release converting plant 2, Inverter Station
0.4s, converting plant 1 release
0.5s: wind energy turbine set asynchronous switch-on
0.6s～1.6s: active power of wind power field rises by certain slope, and Inverter Station current-order slope rises to 1.0
1.7s: the inversion power of standing firm is controlled and to be put into operation
3.0～5.0s: wind energy turbine set experience amplitude is-2m/s, the fitful wind disturbance that the duration is 2s
During 0s～0.4s, by converting plant 2 and Inverter Station, carry out the direct voltage that start-up operation is set up multi-terminal HVDC transmission system, because converting plant 1 is in blocking, converting plant 1 is identical with the direct voltage of converting plant 2, afterwards, converting plant 1 release, due to the existence of DC line resistance, the direct voltage difference that converting plant 1 and converting plant are 2 increases gradually, finally maintain stationary value, as shown in Fig. 4 (a).During 0s～0.4s, along with start-up course is carried out, the direct current power of converting plant 2 and Inverter Station rises gradually, as shown in Fig. 4 (b), because converting plant 2 and Inverter Station direct current power fiducial value are chosen difference, Fig. 4 (b) shows that both direct current power perunit values have compared with big difference, and the famous value of converting plant 2 and Inverter Station is basically identical.0.4s left and right, the direct voltage of multi-terminal HVDC transmission system reaches near rated value.
0.6s～1.6s wind energy turbine set has power to rise by certain slope from zero.As shown in Fig. 5 (b), the direct current power of converting plant 1 rises by certain slope, the direct current power of Inverter Station also rises by certain slope, after the determining power control loop joint and put into operation of 1.7s Inverter Station, Inverter Station direct current power maintains 1.0 marks one, during 0.6s～1.6s, the direct current power of converting plant 2 is substantially constant.
3.0～5.0s, wind energy turbine set experience amplitude is-2m/s, the fitful wind disturbance that the duration is 2s.Wind power first declines and rises afterwards under wind speed perturbation action, cause converting plant 1 direct current power first to decline and rise afterwards, for steady electric power is provided to load center, the direct current power of converting plant 2 first rises and declines afterwards, change in the opposite direction with the power of converting plant 1, as shown in Fig. 5 (a)-(c).
From the simulation experiment result, system that the present invention carries can stably start, and wind speed disturbance meeting causes the variation of wind power, and then causes converting plant 1 power to change, converting plant 2 power can change and change along with wind power, and the power that Inverter Station provides to load center is constant.In summary, the present invention can be by wind power generation and conventional power plant associating, for load center provides steady electric power.
What more than enumerate is only several concrete embodiments of the present invention; the invention is not restricted to above embodiment; can also have many distortion, all distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention, all should think protection scope of the present invention.
Claims (3)
1. one kind wind energy turbine set and conventional power plant are combined to grid-connected multi-terminal HVDC transmission system, comprise Liang Ge converting plant and an Inverter Station, it is characterized in that, described wind energy turbine set is attached to the ac bus side of the first converting plant wherein, described conventional power plant is attached to the ac bus side of the second converting plant wherein, described Inverter Station is attached to load center, and described Liang Ge converting plant and DC bus corresponding to Inverter Station are linked together by DC power transmission line;
Wherein, described the first converting plant connecting with wind energy turbine set is connected with local AC network, by described local AC network, interchange commutation voltage is provided to this first converting plant.
2. multi-terminal HVDC transmission system according to claim 1, is characterized in that, described Liang Ge converting plant and an Inverter Station all adopt current source type converter.
3. the starting method of the multi-terminal HVDC transmission system described in claim 1 or 2, specifically comprises the steps:
1) by described the second converting plant and Inverter Station, set up the direct voltage of this multi-terminal HVDC transmission system;
2), by STATCOM, synchronous compensator or local AC network are set up the interchange commutation voltage of described the first converting plant;
3) wind energy turbine set is carried out asynchronous switch-on operation;
4) described the first converting plant release, active power of wind power field rises to the maximum corresponding with current wind speed by certain slope simultaneously;
5) drop into the power control loop of determining of Inverter Station, completion system starts.
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