JP2014176257A - Wind power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wind power generation system capable of increasing output capacity while suppressing voltage rise in each unit in the case of connecting a plurality of wind power generators in series.SOLUTION: A wind power generation system comprises: two sets of wind power generation unit groups U1, U2 composed of a plurality of wind power generation units 11 to 1n having a wind turbine 111 for generating rotation energy according to wind force, a wind power generator 121 for generating AC power according to the rotation energy generated in the wind turbine, and a converter 131 for converting the AC power generated in the wind power generator to DC power; two sets of conversion units 20a, 20b which are provided for the wind power generation unit groups respectively and include inverters for receiving the serial sum of DC power output by respective converters of the plurality of wind power generation units to convert the sum to AC power; and a synchronous phase modifier 50 which is positioned between the two sets of conversion units and shared by the two sets of conversion units.

Description

  The present invention relates to a wind power generation system using wind power, and more particularly to a wind power generation system having a plurality of wind turbines.

  Currently, various studies and efforts are being made to solve the global warming problem.

  Particularly in recent years, effective utilization of renewable energy has become an urgent task due to various issues surrounding nuclear power generation and the rapid rise in crude oil prices.

  Here, wind power generation is considered to be one of the promising and promising means for conservation and improvement of the global environment because it does not require fuel.

  By the way, since the density of wind energy is low, the output capacity of a single wind power generator is relatively small compared to existing power generation systems such as thermal power plants.

  Therefore, a practical-scale wind power plant is generally constituted by a wind farm in which a plurality of wind power generators are interconnected.

  As a method for interconnecting wind power generators, a method of rectifying the outputs of individual wind power generators and connecting them in series has been proposed (for example, Patent Document 1).

  This system has many advantages such as high reliability and low cost as well as high quality electrical output because the system configuration is simpler than the conventional parallel connection system. Yes.

JP 2010-71156 A

  By the way, in the wind power generation system which employs a series connection method, there is no particular limitation on the number of wind power generators connected in series.

  However, as the number of units increases, the ground voltage of each part of the system increases, so special considerations for insulation (for example, considerations such as increasing the insulation and pressure resistance of each part of the system) are necessary, and the cost is reduced. There is a problem that it is bulky.

  On the other hand, as the number of wind turbines and wind power generators that make up the wind farm increases, the output capacity can be increased accordingly, and output fluctuations can be leveled, so the output capacity can be increased without special consideration for insulation. It is desired to develop an interconnection system that enables this.

  The present invention has been made to solve the above-described problems, and is capable of increasing the output capacity while suppressing an increase in voltage at each part when a plurality of wind power generators are connected in series. The purpose is to provide a system.

  According to one aspect of the present invention, a wind turbine that generates rotational energy in accordance with wind power, a wind power generator that generates AC power in response to rotational energy generated in the wind turbine, and AC power generated in the wind power generator A wind power generation unit group including a plurality of wind power generation units each having a wind power generation unit having a converter for converting the wind power generation unit into DC power, the converter of the plurality of wind power generation units provided for each wind power generation unit group And two sets of conversion units each having an inverter for converting a series sum of the DC powers output from each other into AC power, and the two conversion units between the two sets of conversion units. A wind power generation system characterized by having a synchronous phase adjuster shared by the company is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the wind power generation system which can increase output capacity can be provided, suppressing the voltage rise of each part in the case of connecting a plurality of wind power generators in series.

It is a schematic block diagram which shows the structural example (a)-(c) of the wind power generation system which concerns on embodiment of this invention. It is a graph which shows the waveform (a)-(g) of the inverter output voltage (control advance angle = 20 degrees, 20 degrees) in the wind power generation system which concerns on this Embodiment. It is a graph which shows the waveform (a)-(g) of the inverter output voltage (control advance angle = 50 degrees, 50 degrees) in the wind power generation system which concerns on this Embodiment. It is a schematic block diagram which shows the structural example of the wind power generation system which concerns on a comparative example. It is a graph which shows the waveform of the inverter output voltage in the wind power generation system which concerns on a comparative example. It is a graph which shows the waveform of the output voltage of the system in the wind power generation system which concerns on a comparative example. It is a graph which shows the waveform of the output current of the inverter in the wind power generation system which concerns on a comparative example. It is a graph which shows the waveform of the load current in the wind power generation system which concerns on a comparative example. It is a graph which shows the waveform of the armature current in the wind power generation system which concerns on a comparative example. It is a graph which shows the example of the experimental conditions in the wind power generation system which concerns on a comparative example. It is a graph which shows the experimental result based on the experimental condition of FIG. It is a block diagram which shows the structural example of the wind power generation system which concerns on a basic composition. It is a schematic block diagram which shows the structural example of the wind power generation system which concerns on a basic composition.

  Hereinafter, an embodiment as an example of the present invention will be described in detail with reference to the drawings. Here, in the accompanying drawings, the same reference numerals are given to the same members, and duplicate descriptions are omitted. In addition, since description here is the best form by which this invention is implemented, this invention is not limited to the said form.

(Wind power generation system according to the basic configuration)
Before describing the wind power generation system according to the present embodiment, a wind power generation system S20 according to the basic configuration will be described with reference to FIGS.

  As shown in FIG. 12, the wind power generation system S20 according to the basic configuration includes wind turbines 111 to 11n (n is an integer of 2 or more) that generates rotational energy according to wind power, and rotations generated by the wind turbines 111 to 11n. Wind power generators 121 to 12n that generate AC power according to energy, converters 131 to 13n that convert AC power generated by the wind power generators 121 to 12n into DC power, and wind power that rotates the wind turbines 111 to 11n A plurality of wind power generation units 11 to 1n each having an anemometer (not shown) for measuring wind speed, and a series sum of DC power output from converters 131 to 13n of the plurality of wind power generation units 11 to 1n are input, and the series sum A conversion unit 20 having an inverter 21 that converts AC to AC power, and a plurality of wind power generation units A control unit (not shown) that monitors the wind speed measured by the anemometers 11 to 1n and controls the output voltages Vd1 to Vdn of the converters 131 to 13n and the input voltage of the inverter in real time according to the wind speed. Provide (n: integer of 2 or more).

  The basic configuration shown in FIG. 12 further includes a synchronous power generation unit 150.

  This wind power generation system S20 can output AC power obtained by synthesizing the series sum of the outputs of the wind power generation units 11 to 1n and the output of the synchronous power generation unit 150.

  The wind turbines 111 to 11n convert the kinetic energy of the wind into rotational energy and drive the wind power generators 121 to 12n, respectively.

  Specifically, the wind power generators 121 to 12n are mechanically connected to the rotating shafts of the wind turbines 111 to 11n, and the wind power generators 121 to 12n output power corresponding to the wind power to the converters 131 to 13n.

  As the wind power generators 121 to 12n, a synchronous generator such as a permanent magnet synchronous generator (PMSG) or a wound field synchronous generator can be employed.

  For example, PMSG is suitable because it does not require a power supply circuit for field excitation, has a simple structure, and is easy to maintain.

  As the converters 131 to 13n, for example, thyristor converters can be employed. However, even a converter other than a thyristor converter can be used in the converters 131 to 13n as long as it is a current type converter using a self-extinguishing element capable of controlling the output voltages Vd1 to Vdn by an external signal. is there.

  Here, parameters that can be adjusted from the outside of the converters 131 to 13n in order to control the output voltages Vd1 to Vdn are referred to as “converter parameters” below.

  When thyristor converters are employed as the converters 131 to 13n, the output voltages Vd1 to Vdn are controlled by adjusting the control angles of the converters 131 to 13n. That is, the control angle is a converter parameter of the converters 131 to 13n.

  When an insulated gate bipolar transistor (IGBT) or a field effect transistor (FET) is used for the converters 131 to 13n, the output of the converters 131 to 13n is controlled by adjusting the gate voltage.

  As shown in FIG. 12, the output terminals of the wind power generation units 11 to 1n are connected in series. Then, the series sum of the DC power output from the wind power generation units 11 to 1n is sent to the conversion unit 20 via the DC power transmission line 40.

  Here, a direct current (hereinafter referred to as “DC link current”) sent from the wind power generation units 11 to 1n to the conversion unit 20 is defined as Id. Further, the output voltage sum (hereinafter referred to as “DC link voltage”) Vd of the wind power generation units 11 to 1n is Vd = Vd1 + Vd2 +... + Vdn.

  The conversion unit 20 supplies the AC power output from the inverter 21 to a power system or a load (not shown).

  The conversion unit 20 illustrated in FIG. 12 includes a DC reactor 22 and an inverter 21.

  The direct current reactor 22 is for smoothing the direct current sent from the wind power generation units 11 to 1n.

  The inverter 21 converts the direct current smoothed by the direct current reactor 22 into alternating current.

  As the inverter 21, for example, a separately-excited thyristor inverter can be used. However, even an inverter other than a thyristor inverter can be used for the inverter 21 as long as it is a current type inverter using a self-extinguishing element capable of controlling the input voltage by an external signal.

  A parameter that can be adjusted from the outside of the inverter 21 for controlling the input voltage Ed of the inverter is hereinafter referred to as an “inverter parameter”. When a thyristor inverter is adopted as the inverter 21, the input voltage Ed of the inverter is controlled by adjusting the control advance angle. That is, the control advance angle is an inverter parameter of the inverter 21.

  A control unit (not shown) monitors the wind speed measured by the anemometer. And a control unit outputs the converter output control signal which changes the converter parameter which adjusts the output voltage Vd1-Vdn of converters 131-13n to converters 131-13n according to a wind speed, respectively.

  Further, the control unit outputs an inverter control signal for changing an inverter parameter for adjusting the input voltage of the inverter 21 to the inverter 21 according to the wind speed.

  Next, the synchronous power generation unit 150 will be described.

  The output of the conversion unit 20 varies depending on the wind power as an energy source. For example, the wind speed is unstable because there are many fluctuation factors of wind power such as topography and seasonal wind at each installation location. Therefore, a so-called hybrid wind power generation system that combines the output of the conversion unit 20 and the output of another power generation system is effective in order to reduce the output fluctuation of the conversion unit 20 caused by the wind power fluctuation.

  In the wind power generation system S20 illustrated in FIG. 12, AC power obtained by combining the output of the conversion unit 20 and the output of the synchronous power generation unit 150 can be output.

  The synchronous power generation unit 150 shown in FIG. 12 includes a synchronous generator (synchronous phase adjuster) 50, a waveform improving reactor 52, and a prime mover (not shown).

  The prime mover drives the synchronous generator 50 by converting various kinds of energy existing in the natural world such as solar energy into mechanical energy.

  The prime mover can be composed of, for example, a gas turbine or a gasoline engine.

  In addition, in order to keep the rotation speed of the synchronous generator 50 constant even when the output of the synchronous generator 50 fluctuates due to a load change or the like, the output of the prime mover is controlled by a governor (not shown). You may do it.

  The synchronous generator 50 is driven by a prime mover and outputs AC power. The synchronous generator 50 supplies a shortage of electric power (effective amount) that cannot be covered by the outputs of the converters 131 to 13n in order to keep the output of the entire wind power generation system S20 constant.

  That is, when the power output from the conversion unit 20 is insufficient for the predetermined power required by the load, the synchronous generator 50 supplies the insufficient power to the load.

  Therefore, the wind power generation system S20 having the synchronous power generation unit 150 can supply necessary predetermined power to the load without depending on the fluctuation of the wind power.

  In addition, the synchronous generator 50 supplies reactive power necessary for commutation to the inverter 21 in which a thyristor inverter is adopted via a waveform improvement reactor 52.

  When the control advance angle of the inverter 21 and the current overlap angle become equal, a commutation failure occurs in the inverter 21. Therefore, the control advance angle needs to be controlled in a state larger than the current overlap angle. Since synchronous generator 50 controls commutation of inverter 21, the output frequency of wind power generation system S20 is determined based on the rotational speed of synchronous generator 50.

  Furthermore, the synchronous generator 50 supplies reactive power required by the load of the wind power generation system S20.

  The waveform improvement reactor 52 combines the AC power output from the conversion unit 20 and the power output from the synchronous generator 50, and outputs predetermined power to the load. At that time, the waveform improving reactor 52 removes the harmonic component of the output voltage. Moreover, the waveform improvement reactor 52 can cancel the initial transient inductance of the synchronous generator 50 equivalently by appropriately selecting the self-inductances L1 and L2 and the mutual inductance M of the two reactor coils. For this reason, the waveform depression of the output voltage due to the commutation of the inverter 21 can be prevented.

  As shown in FIG. 12, when current flows from both the conversion unit 20 and the output end of the synchronous generator 50, the waveform improving reactor 52 is on the same iron core so that magnetic fluxes generated by both currents are added. And two coils connected in series.

Alternatively, as shown in FIG. 13, the waveform improving reactor 152 cancels out the magnetic flux generated by both currents when current flows from both the conversion unit 20 shown in FIG. 12 and the output end of the wind power generation system S20. It may be configured by two coils 152a and 152b wound on the same iron core and connected in series so as to match.

  The waveform improving reactor 52 is not necessarily an essential component. Even when the waveform improvement reactor 52 is not provided, the wind power generation system S20 can be operated. However, some sort of filter is considered necessary. Further, when the waveform improving reactor 52 is employed, the self-inductances L1 and L2 and the mutual inductance M of the two reactor coils constituting the waveform improving reactor 52 are as follows in order to suppress the current overlapping angle to a predetermined value or less. It needs to be selected appropriately.

  As described above, by controlling the output of the prime mover, it is possible to compensate for the output fluctuation of the wind power generators 121 to 12n due to the fluctuation of the wind speed. In addition, what kind of energy source for driving a motor | power_engine may be used, for example, renewable energy and biomass resources, such as sunlight, can also be utilized. It is also possible to omit the prime mover. In this case, the synchronous generator 50 operates as a synchronous phase adjuster, and the AC output of the wind power generation system S20 is only the output by wind power generation.

  The synchronous power generation unit 150 is not an essential component for the wind power generation system S20. For example, reactive power required for commutation of the inverter 21 in which a thyristor inverter is employed may be supplied from the load side of the wind power generation system S20.

  FIG. 13 is a schematic configuration diagram illustrating the wind power generation system S20 illustrated in FIG. 12 in a simplified manner.

  In FIG. 13, the thyristor rectifier circuits connected in series shown in FIG. 12 are included in a series-connected wind turbine group (unit group) U.

  According to the wind power generation system S20 according to such a basic configuration, there is an advantage that the system configuration can be simplified compared to the conventional parallel connection method, and high reliability and cost reduction can be expected. It also has the advantage that high quality electrical output can be obtained.

  However, in the wind power generation system S20 according to the basic configuration, the number of wind generators connected in series is not particularly limited, but the ground voltage of each part of the system increases as the number increases. The ground voltage reaches tens of thousands to hundreds of thousands of V depending on the number of wind power generators, and special consideration for insulation is required.

  Special considerations for insulation include, for example, considerations such as enhancing the insulation and pressure resistance of each part of the system, but enormous costs were required to achieve this.

  On the other hand, as the number of windmills and wind power generators that make up the wind farm increases, the output capacity can be increased and the leveling of output fluctuations can be expected.Therefore, without special consideration for insulation as described above. Development of a wind power generation system capable of increasing the output capacity has been desired.

  Therefore, as a result of earnest research, the present inventor has completed the wind power generation system according to the present invention.

(Wind power generation system according to the embodiment)
The wind power generation system S1 (S1a to S1c) according to the embodiment will be described with reference to FIGS.

  Fig.1 (a) is a schematic block diagram which shows the structural example of the wind power generation system S1a which concerns on 1st Example.

  The wind power generation system S1a according to the first embodiment is provided with two sets of unit groups U1 and U2 each composed of a plurality of wind power generation units, and converters of the plurality of wind power generation units (see FIG. 2) (see thyristor converters 131 to 13n shown in FIG. 12), and two series of conversion units 20a having inverters (thyristor inverters) 21a and 21b for inputting the series sum of the DC power output from each of them and converting the series sum into AC power. 20b.

  A transformer (transformer) 500 is connected to the upper output side which is the unit group U1 side.

  The transformer (transformer) 500 was an ideal transformer having a turns ratio = 1: 1.

  The initial transient inductance was 1 mH, and the waveform improving reactor was twice the value that can completely cancel the initial transient inductance.

  The waveform improving reactor 52a is configured by connecting the coils 300a and 300b, and the waveform improving reactor 52b is configured by connecting the coils 300c and 300d.

  One synchronous phase adjuster 50 is connected at an intermediate point 201 between the waveform improvement reactor 52a and the waveform improvement reactor 52b.

  The specific configuration of the series-connected wind turbine group (unit group) U1, U2 shown in FIG. 1 is the same as that of the series-connected wind turbine group (unit group) U of the wind power generation system S20 according to the basic configuration shown in FIG. It is.

  Moreover, FIG.1 (b) is a schematic block diagram which shows the structural example of the wind power generation system S1b which concerns on 2nd Example.

  The difference between the wind power generation system S1b according to the second embodiment and the wind power generation system S1a according to the first embodiment is that the transformer (transformer) 500 in the wind power generation system S1a is omitted. Even in such a configuration, one synchronous phase adjuster 50 can be connected to be shared at the intermediate point 201 between the waveform improving reactor 52a and the waveform improving reactor 52b.

  Moreover, FIG.1 (c) is a schematic block diagram which shows the structural example of the wind power generation system S1c which concerns on 3rd Example.

  The difference between the wind power generation system S1c according to the third embodiment and the wind power generation system S1a according to the first embodiment is that the transformer (transformer) 500 in the wind power generation system S1a is connected in series to the wind turbine group (unit group) U2 side. It is also a point provided. Even in such a configuration, one synchronous phase adjuster 50 can be connected to be shared at the intermediate point 201 between the waveform improving reactor 52a and the waveform improving reactor 52b.

  2 and 3 show examples of simulation results of the wind power generation system S1 (S1a to S1c) according to the embodiment.

  FIG. 2 shows the case where the control lead angle = 20 ° and 20 °, and FIG. 3 shows the case where the control lead angle = 50 ° and 50 °.

  2 and 3, (a) is the upper inverter output voltage, (b) is the lower inverter output voltage, (c) is the upper system output voltage, and (d) is the lower system output voltage. (E) shows the inverter input side voltage of Ed1 (see FIG. 1 (a)), (f) shows the inverter input side voltage of Ed2 (see FIG. 1 (a)), and (g) shows the DC link current.

  As can be seen from the waveforms of (c) and (d) of FIGS. 2 and 3, according to the wind power generation system S1 according to the present embodiment, a complete three-phase AC waveform without distortion can be obtained as it is. Can be connected to the load.

  Here, when the wind power generation system S20 according to the basic configuration shown in FIG. 13 is compared with the wind power generation system S1 according to the present embodiment, the synchronous adjustment is performed as compared with the case where two wind power generation systems S20 are simply provided. The phase machine 50 can be integrated into one and the cost can be reduced.

  Further, even if the number of wind power generators is doubled, it is not necessary to increase the number of synchronous phase adjusters 50. Therefore, the total output of the wind power generation system can be doubled with a relatively simple configuration.

  1 is installed to commutate the thyristors of the thyristor inverters 21a and 21b, and the parameters of the waveform improving reactors 52a and 52b completely cancel the output voltage distortion on the AC output side. Select.

  Further, when the synchronous phase adjuster 50 is driven by a prime mover and operated as a synchronous generator, a hybrid system can be configured, and by controlling the output of the prime mover, the output fluctuation of the wind power generator due to the fluctuation of the wind speed is controlled. Can be compensated.

  As described above, according to the wind power generation system S1 according to the present embodiment, the following effects can be obtained.

  1) Since a thyristor is used as a switching element of a power converter and a large capacitor for smoothing is not used, reliability is improved and maintenance is easy. In addition, the capacity can be easily increased.

  2) If a synchronous phase adjuster provided together is driven by a prime mover and used as a synchronous generator, a so-called hybrid wind power generation system can be realized, and leveling of fluctuations in the output of the windmill can be easily achieved.

  3) Since no output voltage distortion can be eliminated in principle without using a harmonic elimination filter necessary for a voltage source inverter, high-quality power can always be obtained.

  4) Since a current source thyristor inverter is employed, the cost can be reduced compared to a voltage source inverter that requires an IGBT, a smoothing capacitor, or the like.

  5) As a means for transmitting the direct current output of the wind power generator group to the inverter, a direct current power transmission system advantageous for long-distance power transmission can be used, so that the degree of freedom in selecting a wind turbine installation location is increased.

(Wind power generation system according to comparative example)
A wind power generation system S10 according to a comparative example will be described with reference to FIGS.

  FIG. 4 is a schematic configuration diagram illustrating a configuration example of the wind power generation system S10 according to the comparative example.

  The wind power generation system S10 according to the embodiment is provided with two sets of unit groups U1 and U2 each including a plurality of wind power generation units, and converters of the plurality of wind power generation units (FIG. 12). 2), two series of conversion units 20a and 20b having inverters (thyristor inverters) 21a and 21b for inputting the series sum of the DC power output from each of the thyristor converters 131 to 13n and converting the series sum into AC power. The two sets of unit groups U1 and U2 are connected via a common line C connecting intermediate points 100a and 100b, which are reference potentials between the unit groups U1 and U2 and the conversion units 20a and 20b. Configured.

  The specific configuration of the series-connected wind turbine group (unit group) U1 and U2 shown in FIG. 4 is the same as that of the series-connected wind turbine group (unit group) U of the wind power generation system S20 according to the basic configuration shown in FIG. It is.

  The waveform improving reactor 52a is configured by connecting coils 300a and 300b at a node 200a, and the waveform improving reactor 52b is configured by connecting coils 300c and 300d at a node 200b.

  Moreover, the waveform improvement reactor 52a and the waveform improvement reactor 52b are connected via nodes 200a and 200b, and the synchronous phase adjuster 50 is connected to an intermediate point 201 thereof.

  Here, when the wind power generation system S20 according to the basic configuration shown in FIG. 13 is compared with the wind power generation system S10 according to the comparative example, the synchronous phase adjuster is compared with the case where two wind power generation systems S20 are simply provided. It can be integrated into one, and the cost can be reduced.

  Moreover, according to the wind power generation system S10 according to the comparative example, the two sets of unit groups U1 and U2 are intermediate points 100a that are reference potentials between the unit groups U1 and U2 and the conversion units 20a and 20b. Since it is connected via the common line C connecting 100b, assuming that the DC output voltages Vdl and Vd2 of the unit groups U1 and U2 are equal to the DC voltage Vd of FIG. The system S10 and the wind power generation system S20 are the same.

  That is, the DC output voltages Vdl and Vd2 in the wind power generation system S10 according to the comparative example in which the number of wind power generators is doubled than the wind power generation system S20 according to the basic configuration shown in FIG. Since it is about the same as the DC voltage Vd of the power generation system S20, there is no need to change the insulation level.

  This eliminates the need for special insulation measures such as increasing the insulation and pressure resistance of each part of the system, doubling the number of wind power generators at low cost, increasing output capacity, and leveling output fluctuations. Can be improved.

  Furthermore, even if the number of wind power generators is doubled, it is not necessary to increase the number of synchronous phase adjusters, so that the total output of the wind power generation system can be doubled with a relatively simple configuration.

  4 is installed to commutate the thyristors of the thyristor inverters 21a and 21b, and the parameters of the waveform improving reactors 52a and 52b completely cancel out the output voltage distortion on the AC output side. Select.

  Further, when the synchronous phase adjuster 50 is driven by a prime mover and operated as a synchronous generator, a hybrid system can be configured, and by controlling the output of the prime mover, the output fluctuation of the wind power generator due to the fluctuation of the wind speed is controlled. Can be compensated.

  Here, FIG. 5 is a graph showing the waveform of the inverter output voltage in the wind power generation system S10 according to the comparative example, and FIG. 6 is a graph showing an example of the output voltage waveform whose waveform is improved by the wind power generation system S10.

  7 shows the waveform of the output current of the inverter in the wind power generation system S10, FIG. 8 shows the waveform of the load current in the wind power generation system S10, and FIG. 9 shows the waveform of the armature current of the synchronous phase adjuster 50 in the wind power generation system S10. Show.

  As shown in FIG. 6 etc., according to the wind power generation system S10, distortion of the output voltage can be suppressed.

  FIG. 10 is a chart showing an example of experimental conditions in the wind power generation system S10, and FIG. 11 is a chart showing experimental results based on the experimental conditions of FIG.

  Although the invention made by the present inventor has been specifically described based on the embodiments, the embodiments disclosed herein are illustrative in all respects and are not limited to the disclosed technology. Should not be considered. That is, the technical scope of the present invention should not be construed restrictively based on the description in the above embodiment, but should be construed according to the description of the scope of claims. All modifications that fall within the scope of the claims and the equivalent technology are included.

S1, S10, S20 ... wind power generation system C ... common line U1, U2 ... unit group 11-1n ... wind power generation unit 20 (20a, 20b) ... conversion unit 21 ... inverter (thyristor inverter)
22 ... DC reactor 40 ... DC transmission line 50 ... Synchronous generator (synchronous phase adjuster)
52a, 52b ... Waveform improving reactor (coil)
100a, 100b ... Intermediate point 111-11n ... Wind turbine 121-12n ... Wind generator 131-13n ... Converter (thyristor converter)
DESCRIPTION OF SYMBOLS 150 ... Synchronous power generation unit 152 ... Waveform improvement reactor 200a, 200b ... Node 201 ... Middle point 300a-300d ... Coil 500 ... Transformer (transformer)

Claims (3)

A wind turbine that generates rotational energy according to wind power, a wind power generator that generates alternating current power according to rotational energy generated by the wind turbine, a converter that converts alternating current power generated by the wind power generator into direct current power, and Has two sets of wind power generation units composed of a plurality of wind power generation units having
Two sets of conversion units provided for each of the wind power generation unit groups, each having an inverter for inputting a series sum of DC power output from the converters of the plurality of wind power generation units, and converting the series sum into AC power; With
A wind power generation system comprising a synchronous phase adjuster shared by the two sets of conversion units between the two sets of conversion units.   The wind power generation system according to claim 1, wherein the synchronous phase adjuster includes a synchronous power generation unit, and the power output from the synchronous power generation unit and the power output from the inverter are combined.   The wind power generation system according to claim 2, wherein the inverter is a thyristor inverter, and the synchronous power generation unit supplies reactive power necessary for commutation to the inverter.

Images