JP2019022272A - Power generation device and power generation system - Google Patents

Power generation device and power generation system Download PDF

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Publication number
JP2019022272A
JP2019022272A JP2017136838A JP2017136838A JP2019022272A JP 2019022272 A JP2019022272 A JP 2019022272A JP 2017136838 A JP2017136838 A JP 2017136838A JP 2017136838 A JP2017136838 A JP 2017136838A JP 2019022272 A JP2019022272 A JP 2019022272A
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Japan
Prior art keywords
harmonic
tap
power
reactor
interconnection
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JP2017136838A
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Japanese (ja)
Inventor
正親 中谷
Masachika Nakatani
正親 中谷
近藤 真一
Shinichi Kondo
真一 近藤
智道 伊藤
Tomomichi Ito
智道 伊藤
坂本 潔
Kiyoshi Sakamoto
坂本  潔
満 佐伯
Mitsuru Saeki
満 佐伯
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株式会社日立製作所
Hitachi Ltd
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Priority to JP2017136838A priority Critical patent/JP2019022272A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01Arrangements for reducing harmonics or ripples
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40Arrangements for reducing harmonics
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Abstract

To provide a power generation device and a power generation system in which amplification of a harmonic current caused by resonance can be suppressed while degradation of the power generation efficiency is prevented.SOLUTION: A power generation device 1 at least includes a power converter 13 that transmits generated power to a power system after converting the frequency thereof, and a harmonic filter 14 that is disposed between the power converter 13 and a power system 4, and is AC connected to the power system 4 via a cable 2 and a linkage point 3. The harmonic filter 14 adjusts the inductance or electric capacity so as to suppress amplification of a harmonic current at the linkage point, whereby amplification of a harmonic current caused by resonance is suppressed while degradation of the power generation efficiency is prevented.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power generation apparatus and a power generation system that supply generated power to a power system (commercial power system), and in particular, a power generation apparatus including a power converter and a harmonic filter that converts the frequency of the generated power and sends the power to the power system. And a power generation system.

  Reducing carbon dioxide emissions, which is thought to cause global warming, has become a major issue. As one of the methods for reducing carbon dioxide emissions, the introduction of power generation devices using natural energy such as solar power generation or wind power generation has become popular. In addition, since natural energy has large fluctuations in generated power, the introduction of power generation systems that include a power storage device and smooth the generated power by charging and discharging the power storage device is increasing. These power generation systems supply power generated by a wind power generation device, a solar power generation device, or a storage battery to a power system via a power converter. Generally, a power converter incorporates a harmonic filter that removes harmonics flowing out from the power converter. The harmonic filter is composed of a reactor and a capacitor.

Such a power generation system may be linked to a power system (commercial power system) via a cable. Since the cable itself has an inductance and a capacitance, a resonance circuit is formed by the cable and the harmonic filter. When the length of the cable is short, there is no problem, but when the length is several kilometers or more, the harmonic current flowing out from the power converter may be amplified by the resonance circuit.
With respect to a method for suppressing harmonic current due to resonance, proposals have been made to improve the harmonic filter. For example, Patent Document 1 discloses a method of connecting a resistor in series to a capacitor of a harmonic filter. The resistance suppresses the amplification of the harmonic current due to the resonance between the inductance and the capacitance.

JP 2005-184990 A

However, in the configuration disclosed in Patent Document 1, no consideration is given to the point that the power generation efficiency is reduced due to the power loss generated by the resistor connected in series to the capacitor of the harmonic filter.
Therefore, the present invention provides a power generation apparatus and a power generation system that can suppress a harmonic current amplification due to resonance while preventing a decrease in power generation efficiency.

In order to solve the above-mentioned problems, a power generator according to the present invention includes at least a power converter that converts the frequency of generated power and sends the power to the power system, and a harmonic filter disposed between the power converter and the power system. The harmonic filter is connected to the power system via a cable and a connection point, and the harmonic filter suppresses amplification of harmonic current at the connection point. The electric capacity is adjusted.
Moreover, the power generation system according to the present invention includes at least one power generation device, an electronic terminal, and a communication network that connects these to each other so that they can communicate with each other, and the power generation device converts at least the frequency of the generated power. A power converter to be sent to an electric power system, and a harmonic filter disposed between the electric power converter and the electric power system, the AC being connected to the electric power system via a cable and a connection point, and the harmonics The filter is characterized by adjusting an inductance or a capacitance so as to suppress amplification of a harmonic current at the interconnection point.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the electric power generating apparatus and electric power generation system which can suppress amplification of the harmonic current by resonance, preventing the fall of electric power generation efficiency.
Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole schematic block diagram of the wind power generation system of Example 1 which concerns on one Example of this invention. It is a figure which shows the structure of the principal part of the wind power generation system shown in FIG. It is a block diagram of the harmonic filter shown in FIG. It is a figure which shows the equivalent circuit of the power converter, harmonic filter, cable, interconnection point, and electric power system in Example 1. It is a figure which shows the impedance of the equivalent circuit shown in FIG. It is a figure explaining suppression of the harmonic current of the connection point by the harmonic filter in Example 1. FIG. It is a figure which shows the structure of the modification 1 of the harmonic filter shown in FIG. It is a figure which shows the structure of the modification 2 of the harmonic filter shown in FIG. It is a block diagram of the harmonic filter of Example 2 which concerns on the other Example of this invention. It is a figure explaining the adjustment performance of the inductance of the harmonic filter shown in FIG. It is a block diagram of the tap switching reactor which comprises the harmonic filter of Example 3 which concerns on the other Example of this invention. It is a block diagram of the harmonic filter of Example 4 which concerns on the other Example of this invention. It is a functional block diagram of the tap settling apparatus shown in FIG. It is a figure which shows the processing flow of the tap settling apparatus shown in FIG. It is a functional block diagram of the modification of the tap settling device shown in FIG. It is a block diagram of the harmonic filter of Example 5 which concerns on the other Example of this invention. It is a functional block diagram of the resonance gain test | inspection part shown in FIG. It is a figure which shows the processing flow of the resonance gain test | inspection part shown in FIG. It is a block diagram of the modification of the harmonic filter shown in FIG. It is a functional block diagram of the resonance gain test | inspection part shown in FIG. It is a figure which shows the processing flow of the resonance gain test | inspection part shown in FIG. It is a figure which shows the structure of the principal part of the solar power generation system of Example 6 which concerns on the other Example of this invention. It is a figure which shows the structure of the principal part of the electrical storage system of Example 7 which concerns on the other Example of this invention.

In this specification, the power generation device includes, for example, a power generation device that uses natural energy such as a wind power generation device and a solar power generation device, and a power storage device that smoothes the generated power by charging and discharging and sends it to the power system (commercial power system). Is included.
Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an overall schematic configuration diagram of a wind power generation system according to a first embodiment of the present invention. As shown in FIG. 1, a wind power generation system 100 includes a wind power generation apparatus 1 and an electronic terminal 32 installed in an operation management center 31, which are connected via a communication network 5 so that they can communicate with each other. Note that the communication network 5 may be wired or wireless. In addition, the power generated by the wind power generator 1 is sent to the power system 4 (commercial power system) via the cable 2 and the interconnection point 3. In addition, although the example shown in FIG. 1 shows the one wind power generator 1, it is not restricted to this, For example, it cannot be overemphasized that it is applicable to the wind farm in which the several wind power generator 1 is installed, for example.

  The wind power generator 1 includes a blade 24 that rotates by receiving wind, a hub 23 that supports the blade 24, a nacelle 22, and a tower 21 that rotatably supports the nacelle 22. In the nacelle 22, a main shaft 25 connected to the hub 23 and rotating together with the hub 23, a shrink disk 26 connected to the main shaft 25, a speed increasing device 27 connected to the main shaft 25 via the shrink disk 26 and increasing the rotation speed, And a generator 12 that performs a power generation operation by rotating the rotor at a rotational speed increased by the speed increaser 27. The part that transmits the rotational energy of the blade 24 to the generator 12 is called a power transmission unit. In this embodiment, the main shaft 25, the shrink disk 26, and the speed increaser 27 are included in the power transmission unit. The speed increaser 27 and the generator 12 are held on the main frame 28. Further, the blade 11 and the hub 23 constitute the rotor 11. As shown in FIG. 1, a power converter 13 that converts the frequency of power, a switching switch and transformer (not shown) for switching current, and a control device are installed at the bottom (lower part) of the tower 21. 29 etc. are arranged. The power converter 13 may also be referred to as a PCS (Power Conditioning System).

As the control device 29, for example, a control panel or SCADA (Supervision Control And Data Acquisition) is used. In this embodiment, a downwind type wind power generator will be described as an example, but the present invention can be similarly applied to an upwind type wind power generator. Moreover, although the example which comprises the rotor 11 with the 3 blades 24 and the hub 23 is shown, it is not restricted to this, The rotor 11 may be comprised with the hub 23 and at least 1 blade 24.
As shown in FIG. 1, the sensor 30 includes, for example, a sensor installed at the root of the blade 24 to measure the blade pitch angle, a sensor installed at the root of the main shaft 25 to measure the rotor azimuth angle, and the azimuth angle of the nacelle 22. And a wind speed / wind direction meter installed on the top of the nacelle 22 for measuring the wind speed / wind direction. Furthermore, the sensor 30 includes a sensor (not shown) that measures the number of revolutions of the generator 12, the amount of power generation, and the like. In other words, the sensor 30 is a sensor that measures various states necessary for controlling the wind turbine generator 1.
SCADA as the control device 29 acquires measurement data (information) from the above-described sensor 30 through a signal line, and based on the acquired measurement data (information), the pitch angle, nacelle azimuth, generator rotation speed Are appropriately controlled, and the acquired measurement data (information) is transmitted to the electronic terminal 32 installed in the operation management center 31 via the communication network 5. Note that measurement data (information) transmitted from the SCADA to the electronic terminal 32 via the communication network 5 includes signals (outputs) representing the wind conditions (including wind speed and direction) and various states of the wind turbine generator 1. included.

FIG. 2 is a diagram illustrating a configuration of a main part of the wind power generation system 100 illustrated in FIG. 1. The wind power generator 1 is linked to a power system 4 (commercial power system) via a cable 2. The power system 4 includes a system impedance 41 and a power source 42. A point where the cable 2 and the power system 4 are connected is referred to as a connection point 3. Each part which comprises the wind power generator 1 is demonstrated.
The wind power generator 1 includes the rotor 11, the generator 12, the power converter 13, and the harmonic filter 14 as described above. Wind energy received by the rotor 11 is converted into electrical energy by the generator 12 and sent to the power converter 13. The power converter 13 converts the voltage and current of the generator 12 into the frequency (50 Hz or 60 Hz) of the power system 4 (commercial power system). A part of the harmonic voltage and the harmonic current flowing out from the power converter 13 is removed by the harmonic filter 14.

<Configuration of harmonic filter>
FIG. 3 is a block diagram of the harmonic filter 14 shown in FIG. The harmonic filter 14 includes a reactor 141, a tap switching reactor 142, and a capacitor 143. Reactor 141 is connected to power converter 13, and tap switching reactor 142 is connected to cable 2. The tap switching reactor 142 includes a plurality of taps (142a, 142b, 142c) in the reactor. One of the plurality of taps (142a, 142b, 142c) and a terminal 142d of the tap switching reactor 142 are connected. The taps (142a, 142b, 142c) connected to the terminal 142d are determined so as to avoid amplification of the harmonic current flowing through the connection point 3 due to resonance. In this embodiment, three taps 142a, 142b, and 142c are shown as an example, but the number of taps is not limited. For example, if the number of taps is appropriately set to three or more. good.

[Principle of harmonic resonance]
Next, the principle of harmonic resonance will be described with reference to FIGS. FIG. 4 shows an equivalent circuit for the nth harmonic of the power converter 13, harmonic filter 14, cable 2, interconnection point 3, and system impedance 41. The relationship between the angular frequency ω and the harmonic order n shown in FIG. 4 is expressed by the following equation (1). In the formula (1), f is the frequency (50 Hz or 60 Hz) of the voltage and current of the power system 4 (commercial power system).
ω = 2πf × n (1)
When the impedance of the equivalent circuit shown in FIG. 4 is aggregated into Z 1 to Z 6 for each branch, FIG. 5 is obtained. Specifically, the impedance Z 1 is the impedance due to the reactor 141 (jωL F1 ) constituting the harmonic filter 14, and the impedance Z 2 is the impedance due to the capacitor 143 (jωC F ) constituting the harmonic filter 14, the impedance Z 3 is the tap switching reactor 142 (jωL F2 ) constituting the harmonic filter 14, the resistance (R C1 ) of the cable 2 connected in series to the tap switching reactor 142, and the impedance due to the reactor (jωL C1 ), and the impedance Z 4 is impedance due to the capacitor (j [omega] C C) of the cable 2, the impedance Z 5 are impedance due cables 2 resistance (R C2) and the reactor (j.omega.L C2), and the impedance Z 6 is the resistance of the system impedance 41 (R ) And the impedance due to the reactor (j.omega.L L).

The relationship between the output voltage V PCS (n) of the power converter 13 and the current I PCC (n) flowing through the interconnection point 3 is derived using the impedances Z 1 to Z 6 shown in FIG. 4 and 5, the impedances Z 1 to Z 6 are expressed by the following formulas (2) to (7).
Z 1 = jωL F1 (2)

Z 3 = R C1 + jω (L F2 + L C1 ) (4)

Z 5 = R C2 + jωL C2 (6)
Z 6 = R L + jωL L (7)
The combined impedance Z 0 viewed from the power converter 13 is expressed by Equation (8).

A current I 1 (n) flowing through the impedance Z 1 from the output voltage V PCS (n) of the power converter 13 and the combined impedance Z 0 is expressed by Expression (9).

The current I 1 (n) is divided into a current I 2 (n) flowing through the impedance Z 2 and a current I 3 (n) flowing through the impedance Z 3 . The current I 2 (n) is shown in Expression (10), and the current I 3 (n) is shown in Expression (11).

The current I 3 (n) is divided into a current I 4 (n) flowing through the impedance Z 4 , an impedance Z 5 and an impedance Z 6 , and a current I PCC (n) flowing through the interconnection point 3. The current I 4 (n) is shown in Expression (12), and the current I PCC (n) is shown in Expression (13).

  When Expression (9) and Expression (11) are substituted into Expression (13), Expression (14) is obtained.

From the equation (14), the relationship between the output voltage V PCS (n) of the power converter 13 and the current I PCC (n) flowing through the interconnection point 3 is expressed by the coefficient α (n) obtained from the impedances Z 1 to Z 6 . It can be seen that Hereinafter, the coefficient α (n) is referred to as a resonance gain.

The aforementioned 4, 5, and from equation (4), adjusting the inductance by switching the connection taps of the tap changer reactor 142 of the harmonic filter 14, the constant of the impedance Z 3 it can be seen that change. Then, from equation (14), varying the constant of the impedance Z 3, it can be seen that adjusting the resonance gain α a (n). That is, the resonance gain α (n) can be adjusted by switching the connection tap of the tap switching reactor 142.

An example in which the harmonic current I PCC (n) at the interconnection point 3 is suppressed by switching the connection tap of the tap switching reactor 142 of the harmonic filter 14 will be described with reference to FIG.
In FIG. 6, an example of the case where the horizontal axis is the harmonic order n and the vertical axis is the resonance gain α (n) is shown in the upper stage. Regarding the tap switching reactor 142 of the harmonic filter 14, the resonance gain α (n) when the terminal 142d and the tap 142b are connected is indicated by a broken line. The solid line represents the resonance gain α (n) when the terminal 142d and the tap 142a are connected.
In FIG. 6, an example where the horizontal axis is the harmonic order n and the vertical axis is the harmonic voltage V PCS (n) of the power converter 13 is shown in the middle stage. The harmonic voltage V PCS (n) of the power converter 13 is obtained by an actual machine test or numerical simulation of the power converter 13. Further, the harmonic voltage V PCS (n) is a component of the power converter 13, which is a switching frequency of a semiconductor element such as an IGBT (Insulated Gate Bipolar Transistor) or a CMOS (Complementary MOS), and the operation of the power converter 13. It depends on conditions such as power factor.

In the lower part of FIG. 6, an example in which the horizontal axis is the harmonic order n and the vertical axis is the harmonic current I PCC (n) of the interconnection point 3 is shown. From the equation (14), the harmonic current I PCC (n) at the interconnection point 3 is applied to the resonance gain α (n) shown in the upper part of FIG. 6 and the harmonic voltage V of the power converter 13 shown in the middle part of FIG. It is obtained by multiplying by PCS (n). When the connection tap of the tap switching reactor 142 of the harmonic filter 14 is 142b, the 23rd harmonic current I PCC (n) at the connection point 3 exceeds the upper limit of the connection rule. Here, the upper limit of the interconnection regulation may be referred to as a grid code. By switching the connection tap of the tap switching reactor 142 from 142b to 142a, the 23rd-order resonance gain α (n) decreases, and the 23rd-order harmonic current I PCC (n) at the connection point 3 is the upper limit of the connection regulation. It can be contained below. Note that the 24th-order resonance gain α (n) is increased by switching the connection tap from 142b to 142a. However, since the output voltage V PCS (n) of the 24th power converter 13 is very small, the 24th harmonic current I PCC (n) at the connection point 3 is kept below the upper limit. That is, the output voltage V PCS (n) of the power converter 13 usually does not include even-order harmonics. Therefore, in order to shift the peak of the resonance gain α (n) to the even order or the harmonic order of the harmonic voltage V PCS (n) of the power converter 13 is low or high, tap by trial and error. Switch.
As described above, the harmonic current I PCC (n) at the interconnection point 3 can be suppressed by adjusting the connection tap of the tap switching reactor 142 of the harmonic filter 14.

<Modification 1 of the harmonic filter>
FIG. 7 is a diagram showing a configuration of Modification 1 of the harmonic filter 14 shown in FIG. 3 is different from the harmonic filter 14 shown in FIG. 3 in that the inductance of the harmonic filter 14a is adjusted by switching the number of reactors connected in parallel to adjust the resonance gain α (n). As shown in FIG. 7, the harmonic filter 14 a includes a plurality of parallel reactors 144 (144 a, 144 b, 144 c) instead of the tap switching reactor 142 (FIG. 3) and a reactor switch 145 (145 a, 145b, 145c). And the number of connections of the parallel reactor 144 (144a, 144b, 144c) is switched by short-circuiting or opening the reactor switch 145. For example, when one parallel reactor 144 is connected, the reactor switch 145a is short-circuited and the reactor switch 145b and the reactor switch 145c are opened. Further, for example, when two parallel reactors 144 are connected, the reactor switch 145a and the reactor switch 145b are short-circuited and the reactor switch 145c is opened.

<Modification 2 of the harmonic filter>
FIG. 8 is a diagram illustrating a configuration of a second modification of the harmonic filter 14 illustrated in FIG. 3. 3 is different from the harmonic filter 14 shown in FIG. 3 in that the capacitance of the harmonic filter 14b is adjusted by switching the number of capacitors connected in parallel to adjust the resonance gain α (n). The harmonic filter 14b includes a reactor 141 instead of the tap switching reactor 142, and includes a plurality of parallel capacitors 146 (146a, 146b, 146c) and a capacitor switch 147 (147a, 147b, 147c) connected thereto. . Then, the number of connected parallel capacitors 146 is switched by short-circuiting or opening the capacitor switch 147. For example, when one parallel capacitor 146 is connected, the capacitor switch 147a is short-circuited and the capacitor switch 147b and the capacitor switch 147c are opened. For example, when two parallel capacitors 146 are connected, the capacitor switch 147a and the capacitor switch 147b are short-circuited and the capacitor switch 147c is opened.

As described above, according to the present embodiment, it is possible to provide a power generation apparatus and a power generation system that can suppress amplification of harmonic current due to resonance while preventing a decrease in power generation efficiency.
Further, according to the present embodiment, the harmonic current I PCC (n) at the interconnection point 3 can be suppressed by adjusting the connection tap of the tap switching reactor 142 of the harmonic filter 14.
Further, according to the present embodiment, the harmonic current I PCC (n) at the interconnection point 3 can be suppressed by switching the number of parallel connections of the parallel reactor 144 of the harmonic filter 14a.
Furthermore, according to the present embodiment, the harmonic current I PCC (n) at the connection point 3 can be suppressed by switching the number of parallel connections of the parallel capacitors 146 of the harmonic filter 14b.

  FIG. 9 is a configuration diagram of the harmonic filter 14c of the second embodiment according to another embodiment of the present invention. The present embodiment is different from the first embodiment in that a plurality of tap switching reactors (148, 149) are provided in the harmonic filter 14c. Specifically, the harmonic filter 14 c includes a first tap switching reactor 148 and a second tap switching reactor 149 instead of the tap switching reactor 142. The same components as those in the first embodiment are denoted by the same reference numerals, and the description overlapping with that in the first embodiment is omitted below.

As shown in FIG. 9, adjustment of the combined inductance of the first tap switching reactor 148 and the second tap switching reactor 149 by the harmonic filter 14c will be described with reference to FIG. FIG. 10 is a diagram for explaining the adjustment performance of the inductance of the harmonic filter 14c shown in FIG. The inductance adjustment candidates of the first tap switching reactor 148 are, for example, three types of 1.7 mH (connection tap 148a), 2.0 mH (connection tap 148b), and 2.3 mH (tap 148c). In addition, the inductance adjustment candidates of the second tap switching reactor 149 are, for example, three types of 0.0 mH (connection tap 149a), 0.1 mH (connection tap 149b), and 0.2 mH (tap 149c).
As shown in FIG. 10, for example, by connecting the terminal 148d of the first tap switching reactor 148 and the tap 148a and connecting the terminal 149d of the second tap switching reactor 149 and the tap 149a, the combined inductance is 1.7 mH. It becomes. Further, by connecting the terminal 148d of the first tap switching reactor 148 and the tap 148b and connecting the terminal 149d of the second tap switching reactor 149 and the tap 149c, the combined inductance becomes 2.2 mH. By connecting the terminal 148d of the first tap switching reactor 148 and the tap 148c and connecting the terminal 149d of the second tap switching reactor 149 and the tap 149c, the combined inductance becomes 2.5 mH.

  Adjusting the combined inductance of the first tap switching reactor 148 and the second tap switching reactor 149 by adjusting the inductance adjustment candidates of the first tap switching reactor 148 and three inductance adjustment candidates of the second tap switching reactor 149. There are nine candidates in increments of 0.1 mH from 1.7 mH to 2.5 mH. The correspondence relationship between the combination of the inductance adjustment candidate of the first tap switching reactor 148 and the inductance adjustment candidate of the second tap switching reactor 149 shown in FIG. 10 and the combined inductance of each combination is, for example, the control device 29 shown in FIG. Stored in SCADA or a storage unit (not shown) in the control panel.

  In the present embodiment, the case where the number of inductance adjustment candidates for the first tap switching reactor 148 is three and the number of inductance adjustment candidates for the second tap switching reactor 149 is three as an example. However, the first tap switching reactor 148 is illustrated. The number of inductance adjustment candidates and the number of inductance adjustment candidates of the second tap switching reactor 149 are not limited to this, and may be set as appropriate. The number of inductance adjustment candidates for the first tap switching reactor 148 and the number of inductance adjustment candidates for the second tap switching reactor 149 are not necessarily the same.

  As described above, according to the present embodiment, in addition to the effects of the first embodiment, by providing a plurality of tap switching reactors in the harmonic filter, the inductance can be finely adjusted from the total number of taps of the plurality of tap switching reactors. Inductance adjustment performance can be improved.

  FIG. 11 is a configuration diagram of a tap switching reactor constituting the harmonic filter according to the third embodiment of the present invention. The present embodiment is different from the first and second embodiments in that the tap switching reactor 142a is provided with a tap switching operation unit. Hereinafter, the tap switching reactor 142a of the present embodiment will be described using the tap switching reactor 142 shown in the first embodiment as a comparison target. The configuration of the present embodiment can be similarly applied to the above-described second embodiment.

  As shown in FIG. 11, the tap switching reactor 142a is different from the tap switching reactor 142 (FIG. 3) of the first embodiment, the tap switching reactor panel 1421 for storing the tap switching reactor 142a, the connection tap operation unit 1422, and the connection. A tap display unit 1423 is provided. The connection tap operation unit 1422 and the connection tap display unit 1423 are provided outside the tap switching reactor board 1421. As shown by the white arrow in FIG. 11, the tap connected to the terminal of the tap switching reactor 142a via the link mechanism or the crank is rotated clockwise as the connection tap operation unit 1422 rotates clockwise. It is switched to tap to do. Similarly, as shown by a black arrow in FIG. 11, the tap connected to the terminal of the tap switching reactor 142a via the link mechanism or the crank is turned counterclockwise when the connection tap operation unit 1422 rotates counterclockwise. It is switched to a tap located clockwise. The connection tap display unit 1423 displays the number or symbol of the current tap connected to the terminal of the tap switching reactor 142a. Note that the display form is not limited to the tap number or symbol, and any display form may be used as long as the tap can be specified. Instead of the connection tap display unit 1423, for example, a connection state of the tap switching reactor 142a stored in the tap switching reactor panel 1421 may be configured to be visible from the outside like a glass window.

  As described above, according to the embodiment, in addition to the effects of the first embodiment and the second embodiment, the operability of tap switching can be improved by the connection tap operation unit 1422. Further, the visibility of the connection tap can be improved by the connection tap display portion 1423. Thereby, the labor of the operator or worker required for tap switching can be reduced.

  FIG. 12 is a configuration diagram of the harmonic filter 14d of the fourth embodiment according to another embodiment of the present invention. The present embodiment is different from the first to third embodiments in that a tap settling device 15 for determining a connection tap of the tap switching reactor 142 constituting the harmonic filter 14d is provided in the harmonic filter 14d. Hereinafter, the harmonic filter 14d of the present embodiment will be described using the harmonic filter 14 shown in the first embodiment as a comparison target. The configuration of the present embodiment can be similarly applied to the above-described second and third embodiments. Also, the same components as those in the first embodiment are denoted by the same reference numerals, and the description overlapping with that in the first embodiment is omitted.

As shown in FIG. 12, the harmonic filter 14 d has a tap settling device 15.
<Configuration of tap settling device>
FIG. 13 is a functional block diagram of the tap settling device 15 shown in FIG. As shown in FIG. 13, the tap settling unit 15 includes an input unit 153, an input I / F 154a, an output I / F 154b, a display unit 152, a connection tap determination unit 151, an FFT 155 (Fast Fourier Transform), a storage unit 156, and a communication. I / F 157 is provided, and these are connected to each other via an internal bus 158 so as to be accessible. The FFT 155 and the connection tap determination unit 151 include, for example, a processor (not shown) such as a CPU (Central Processing Unit), a ROM that stores various programs, a RAM that temporarily stores operation process data, and a storage device such as an external storage device. In addition, a processor such as a CPU reads and executes various programs stored in the ROM, and stores an operation result as an execution result in the RAM or the external storage device.

The input unit 153 is used for setting the upper limit value of the above-mentioned interconnection regulation by an operator or a worker, for example.
The input I / F 154a acquires the measured value of the harmonic current at the connection point 3 and the upper limit value of the connection regulation specified in advance from the input unit 153, and the acquired measured value of the harmonic current at the connection point 3 In addition, the upper limit value of the interconnection regulation is stored in a predetermined storage area of the storage unit 156 via the internal bus 158. Further, the input I / F 154 a transfers the measured value of the harmonic current at the interconnection point 3 to the FFT 155 via the internal bus 158.
The FFT 155 converts the transferred measurement value of the harmonic current at the interconnection point 3 into a harmonic current of each order. Also, the FFT 155 transfers the converted harmonic currents of the respective orders of the interconnection point 3 to the connection tap determination unit 151 via the internal bus 158.
The connection tap determination unit 151 executes processing described in detail later, and transfers the determined connection tap number or alarm to the display unit 152 via the internal bus 158 and the output I / F 154b. Moreover, the connection tap determination part 151 outputs the determined connection tap number or alarm also to SCADA as a control apparatus 29 (FIG. 1) or a control panel via communication I / F157.
The display unit 152 displays the determined connection tap number or alarm transferred on the screen.
In this embodiment, the connection tap determining unit 151 outputs the determined connection tap number or alarm to the SCADA or the control panel as the control device 29 (FIG. 1) via the communication I / F 157. However, the present invention is not necessarily limited to this, and output to SCADA or the control panel may be unnecessary.

[Operation of tap settling device]
FIG. 14 is a diagram illustrating a processing flow of the tap settling device illustrated in FIG. 13. Hereinafter, one of a plurality of taps (142a, 142b, 142c) of the tap switching reactor 142 is connected to the terminal 142d, and the number of the connected tap is referred to as a connection tap number i. A case where the harmonic current I PCC (n) at the interconnection point 3 at the time of the connection tap number i is measured will be described.
In step S11, the input I / F 154a acquires the measured value of the harmonic current I PCC (n) at the connection point 3 for the connection tap number i, and the harmonic current at the connection point 3 for the acquired connection tap number i. The measured value of I PCC (n) is stored in a predetermined storage area of the storage unit 156 via the internal bus 158 and transferred to the FFT 155 via the internal bus 158. The FFT 155 converts the measured value of the harmonic current I PCC (n) at the connection point 3 into the harmonic current I PCC (n) of each order for the transferred connection tap number i. Further, the FFT 155 transfers the harmonic current I PCC (n) of each order of the interconnection point 3 for the converted connection tap number i to the connection tap determination unit 151 via the internal bus 158.

In step S <b> 12, the connection tap determination unit 151 accesses the storage unit 156 via the internal bus 158, and reads an upper limit value set in advance and stored in the storage unit 156. Then, the connection tap determination unit 151 determines whether or not the harmonic current I PCC (n) of each order of the connection point 3 is equal to or less than the upper limit value specified for the connection for the connection tap number i transferred from the FFT 155. . If the result of the determination is that the harmonic current I PCC (n) of each order at the connection point 3 is equal to or less than the upper limit value specified for the connection, the process proceeds to step S13. On the other hand, if the result of determination is that the harmonic current I PCC (n) of each order at the connection point 3 exceeds the upper limit value specified for connection, the process proceeds to step S14.

In step S13, the connection tap determination unit 151 determines the connection tap as the connection tap number i, and outputs the connection tap number i to the display unit 152 via the internal bus 158 and the output I / F 154b.
In step S < b > 14, the connection tap determination unit 151 determines whether or not the harmonic current I PCC (n) at the interconnection point 3 has been measured for all the taps. As a result of the determination, when the measurement of the harmonic current I PCC (n) at the interconnection point 3 is completed for all the taps, the process proceeds to step S16. On the other hand, as a result of the determination, if the measurement of the harmonic current I PCC (n) at the connection point 3 is not completed for all the taps, the process proceeds to step S15 to change the connection tap number i to change the connection point 3 The harmonic current I PCC (n) is measured again, the process returns to step S11, and the processes from step S11 to step S14 are repeated.

  In step S16, the connection tap determination unit 151 outputs an alarm to the display unit 152 via the internal bus 158 and the output I / F 154b.

<Modification of tap settling device>
FIG. 15 is a functional block diagram of a modification of the tap settling device 15 shown in FIG. 12 is a harmonic that estimates the harmonic current I PCC (n) at the interconnection point 3 from the harmonic voltage V PCS (n) of the power converter 13 and the resonance gain α (n). The difference is that a wave current estimation unit 159 is provided.
As shown in FIG. 15, the tap settling unit 15a includes an input unit 153, an input I / F 154a, an output I / F 154b, a display unit 152, a connection tap determination unit 151, a harmonic current estimation unit 159, a storage unit 156, and a communication. I / F 157 is provided, and these are connected to each other via an internal bus 158 so as to be accessible. The connection tap determination unit 151 and the harmonic current estimation unit 159 include, for example, a processor such as a CPU (not shown), a ROM that stores various programs, a RAM that temporarily stores calculation process data, and a storage device such as an external storage device. In addition, a processor such as a CPU reads and executes various programs stored in the ROM, and stores an operation result as an execution result in the RAM or the external storage device.

The input unit 153 is, for example, a resonance gain when the operator or an operator connects the harmonic voltage V PCS (n) of the power converter 13 and the taps (142a, 142b, 142c) of the tap switching reactor 142, respectively. It is used for setting α (n) and the upper limit value of the above-mentioned interconnection regulation.
The input I / F 154a is a resonance when the harmonic voltage V PCS (n) of the power converter 13 and the taps (142a, 142b, 142c) of the tap switching reactor 142 are connected to the input unit 153, respectively. The gain α (n) and the upper limit value of the interconnection regulation are acquired, and the acquired harmonic voltage V PCS (n) of the power converter 13 and taps (142a, 142b, 142c) of the tap switching reactor 142 are respectively set. The resonance gain α (n) in the case of connection and the upper limit value of the interconnection regulation are stored in a predetermined storage area of the storage unit 156 via the internal bus 158. The input I / F 154a is a resonance gain α (n) when the harmonic voltage V PCS (n) of the power converter 13 and the taps (142a, 142b, 142c) of the tap switching reactor 142 are connected to each other. Is transferred to the harmonic current estimation unit 159 via the internal bus 158.

The harmonic current estimation unit 159 has a resonance gain α when the transferred harmonic voltage V PCS (n) of the power converter 13 and the taps (142a, 142b, 142c) of the tap switching reactor 142 are connected to each other. Using (n), the calculation of the above-described equation (14) is executed to obtain an estimated value of the harmonic current I PCC (n) at the interconnection point 3. The harmonic current estimation unit 159 transfers the obtained estimated value of the harmonic current I PCC (n) at the interconnection point 3 to the connection tap determination unit 151 via the internal bus 158.
The connection tap determination unit 151 executes the above-described processing, and transfers the determined connection tap number or alarm to the display unit 152 via the internal bus 158 and the output I / F 154b. Moreover, the connection tap determination part 151 outputs the determined connection tap number or alarm also to SCADA as a control apparatus 29 (FIG. 1) or a control panel via communication I / F157.
The display unit 152 displays the determined connection tap number or alarm transferred on the screen.

In this embodiment, the connection tap determining unit 151 outputs the determined connection tap number or alarm to the SCADA or the control panel as the control device 29 (FIG. 1) via the communication I / F 157. However, the present invention is not necessarily limited to this, and output to SCADA or the control panel may be unnecessary.
Moreover, although the present Example demonstrated as an example the structure which installs the tap setter 15 or the tap setter 15a in the harmonic filter 14d, it is not restricted to this. For example, it is good also as a structure which mounts the function of the above-mentioned tap settling apparatus 15 or the tap settling apparatus 15a in the electronic terminal 31 installed in the operation management center 31 shown in the above-mentioned FIG.

As described above, according to the present embodiment, in addition to the effects of the first to third embodiments, the harmonic filter 14d has the harmonic current I PCC (n) at the connection point 3 or the harmonic at the connection point 3. By adjusting the connection tap of the tap switching reactor according to the estimated value of the current I PCC (n), the harmonic current I PCC (n) at the interconnection point 3 can be suppressed. On the other hand, if the harmonic current I PCC (n) at the connection point 3 cannot be suppressed below the upper limit of the connection regulation even after adjusting the connection tap, the operator or the worker can display the alarm. It is possible to take measures such as stopping the wind power generator 1.

FIG. 16 is a configuration diagram of the harmonic filter 14e of the fifth embodiment according to another embodiment of the present invention. This embodiment differs from the first to fourth embodiments in that a voltage sensor 17, a current sensor 18, and a resonance gain inspection unit 16 that detects changes in the resonance gain α (n) are provided in the harmonic filter 14e. Hereinafter, the harmonic filter 14d of the present embodiment will be described using the harmonic filter 14 shown in the first embodiment as a comparison target. The configuration of the present embodiment can be similarly applied to the above-described second to fourth embodiments. Also, the same components as those in the first embodiment are denoted by the same reference numerals, and the description overlapping with that in the first embodiment is omitted.
As shown in FIG. 16, the harmonic filter 14 e includes a voltage sensor 17, a current sensor 18, and a resonance gain inspection unit 16.

<Configuration of resonance gain inspection unit>
FIG. 17 is a functional block diagram of the resonance gain inspection unit 16 shown in FIG. As shown in FIG. 17, the resonance gain inspection unit 16 includes an input unit 163, an input I / F 164a, an output I / F 164b, a display unit 162, an impedance change detection unit 161, a storage unit 166, and a communication I / F 167. These are connected to each other via an internal bus 168. The impedance change detection unit 161 is realized by, for example, a processor such as a CPU (not shown), a ROM that stores various programs, a RAM that temporarily stores data of calculation processes, a storage device such as an external storage device, and a CPU. The processor reads and executes various programs stored in the ROM, and stores the calculation result as the execution result in the RAM or the external storage device.

The input unit 163 is, for example, by the operator or personnel is subjected to the setting of the set value Z 0 and the error tolerance of the combined impedance.
The input I / F 164 a is input from the harmonic voltage measurement value V S (n) measured by the voltage sensor 17, the harmonic current measurement value I S (n) measured by the current sensor 18, and the input unit 163. The composite impedance set value Z 0 and error tolerance are acquired, and the acquired harmonic voltage measurement value V S (n), harmonic current measurement value I S (n), composite impedance set value Z 0 and error are obtained. Are stored in a predetermined storage area of the storage unit 156 via the internal bus 158. Further, the input I / F 154a transfers the harmonic voltage measurement value V S (n) and the harmonic current measurement value I S (n) to the impedance change detection unit 161 via the internal bus 168.
The impedance change detection unit 161 uses the following expression (15) to calculate the actual measurement value Z 0S of the combined impedance from the transferred harmonic voltage measurement value V S (n) and the harmonic current measurement value I S (n). Ask.

Based on the obtained information, processing to be described in detail later is executed, and a signal indicating that the impedance has changed is transferred to the display unit 162 via the internal bus 168 and the output I / F 164b. In addition, the impedance change detection unit 161 outputs a signal indicating that the connection tap determination unit 151 has changed the impedance to the SCADA or the control panel as the control device 29 (FIG. 1) via the communication I / F 167. .
The display unit 162 displays a signal indicating that the transferred impedance has changed on the screen.
In this embodiment, the impedance change detector 161 outputs a signal indicating that the impedance has changed to the SCADA or the control panel as the control device 29 (FIG. 1) via the communication I / F 167. Although shown, it is not necessarily limited to this, and output to SCADA or the control panel may be unnecessary.

[Resonance gain tester operation]
FIG. 18 is a diagram showing a processing flow of the resonance gain inspection unit 16 shown in FIG.
As shown in FIG. 18, in step S <b> 21, the input I / F 164 a has a harmonic voltage measurement value V S (n) measured by the voltage sensor 17 and a harmonic current measurement value I S (measured by the current sensor 18). n) and the set value Z 0 of the combined impedance input from the input unit 163, and the acquired harmonic voltage measured value V S (n), the harmonic current measured value I S (n), and the combined impedance to transfer via the internal bus 168 the set value Z 0 to the impedance change detection unit 161 stores via the internal bus 168 in a predetermined storage area of the storage unit 166. Here, the set value Z 0 of the combined impedance is a value obtained by the above-described FIG. 5 and the equation (8).

In step S22, the impedance change detection unit 161 performs the calculation of the above-described formula (15) using the transferred harmonic voltage measurement value V S (n) and the harmonic current measurement value I S (n), and performs synthesis. The actual measured value Z 0S of the impedance is obtained.
In step S <b> 23, the impedance change detection unit 161 accesses the storage unit 166 via the internal bus 168, and reads a preset allowable error value stored in the storage unit 166. Then, an error between the transferred setting value Z 0 of the combined impedance and the actually measured value Z 0S of the combined impedance obtained in step S22 is obtained, and it is determined whether or not the obtained error is equal to or less than an allowable error. As a result of the determination, if the obtained error is equal to or less than the allowable value of the error, the process is terminated. On the other hand, if the obtained error exceeds the allowable error as a result of the determination, the process proceeds to step S24.
In step S24, the impedance change detection unit 161 outputs a signal indicating that the impedance has changed to the display unit 162 via the internal bus 168 and the output I / F 164b.

Here, the reason for the impedance change includes, for example, a change in the system impedance 41 due to system switching of the power system 4 (commercial power system), connection of a power factor improving capacitor to the power system 4, and the like. When the impedance changes for these reasons, the characteristic of the resonance gain α (n) shown in the above equation (14) also changes, so that the harmonic current I PCC (n) at the interconnection point 3 may be amplified. is there. However, by outputting the change in impedance to the display unit 162 by the resonance gain inspection unit 16, the operator or worker can immediately grasp that the impedance has changed, and the operator or worker can tap the harmonic filter 14e. Since readjustment of the tap of the switching reactor 142 can be performed quickly, amplification of the harmonic current I PCC (n) at the interconnection point 3 can be suppressed.

<Modification of harmonic filter>
FIG. 19 is a configuration diagram of a modification of the harmonic filter 14e shown in FIG. It differs from the harmonic filter 14e shown in FIG. 16 in that the voltage sensor 17 is omitted.
As shown in FIG. 19, the harmonic filter 14e includes a current sensor 18 and a resonance gain inspection unit 16a.

  FIG. 20 is a functional block diagram of the resonance gain inspection unit 16a shown in FIG. As shown in FIG. 20, the resonance gain inspection unit 16a includes an input unit 163, an input I / F 164a, an output I / F 164b, a display unit 162, an impedance change detection unit 161a, a storage unit 166, and a communication I / F 167. These are connected to each other via an internal bus 168. The impedance change detection unit 161a is realized by, for example, a processor such as a CPU (not shown), a ROM that stores various programs, a RAM that temporarily stores calculation process data, a storage device such as an external storage device, and a CPU. The processor reads and executes various programs stored in the ROM, and stores the calculation result as the execution result in the RAM or the external storage device.

The input unit 163 is used, for example, for setting the harmonic current set value I 1 (n) and the error tolerance by an operator or a worker. Here, the set value I 1 (n) of the harmonic current is calculated in advance from the harmonic voltage V PCS (n) of the power converter 13 and the set value Z 0 of the combined impedance using the above-described equation (9). Use the value obtained.
The input I / F 164a acquires the harmonic current measurement value I S (n) measured by the current sensor 18, the harmonic current set value I 1 (n) input from the input unit 163, and an allowable error. Then, the acquired harmonic current measurement value I S (n), the harmonic current set value I 1 (n) and the allowable error value are stored in a predetermined storage area of the storage unit 166 via the internal bus 168. . In addition, the input I / F 164a transfers the harmonic current measurement value I S (n) and the harmonic current measurement value I S (n) to the impedance change detection unit 161a via the internal bus 168.
The impedance change detection unit 161a performs processing to be described later based on the transferred harmonic current measurement value I S (n), the harmonic current measurement value I S (n), and the error tolerance stored in the storage unit 166. The signal indicating that the impedance has been changed is transferred to the display unit 162 via the internal bus 168 and the output I / F 164b. The impedance change detection unit 161a also outputs a signal indicating that the connection tap determination unit 151 has changed impedance to the SCADA or the control panel as the control device 29 (FIG. 1) via the communication I / F 167. .

The display unit 162 displays a signal indicating that the transferred impedance has changed on the screen.
A configuration for outputting to SCADA as the control device 29 (FIG. 1) or the control panel via the communication I / F 167 is not necessarily required.

FIG. 21 is a diagram illustrating a processing flow of the resonance gain inspection unit illustrated in FIG. 20.
As shown in FIG. 20, in step S31, the input I / F 164a is a harmonic current measurement value I S (n) measured by the current sensor 18 and a harmonic current set value I 1 input from the input unit 163. (N) is acquired, and the acquired harmonic current measurement value I S (n) and the set value I 1 (n) of the harmonic current are stored in a predetermined storage area of the storage unit 166 via the internal bus 168. At the same time, the data is transferred to the impedance change detector 161a via the internal bus 168.

In step S <b> 32, the impedance change detection unit 161 a accesses the storage unit 166 via the internal bus 168, and reads a preset allowable error value stored in the storage unit 166. Then, an error between the transferred harmonic current measurement value I S (n) and the set value I 1 (n) of the harmonic current is obtained, and it is determined whether or not the obtained error is equal to or less than an allowable error value. As a result of the determination, if the obtained error is equal to or less than the allowable value of the error, the process is terminated. On the other hand, as a result of the determination, if the obtained error exceeds the allowable error value, the process proceeds to step S33.
In step S33, the impedance change detection unit 161a outputs a signal indicating that the impedance has changed to the display unit 162 via the internal bus 168 and the output I / F 164b.

  In this embodiment, the configuration in which the resonance gain inspection unit 16 is installed in the harmonic filter 14e or the configuration in which the resonance gain inspection unit 16a is installed in the harmonic filter 14f has been described as an example. However, the present invention is not limited to this. Absent. For example, it is good also as a structure which mounts the function of the above-mentioned resonance gain test | inspection part 16 or the resonance gain test | inspection part 16a in the electronic terminal 31 installed in the operation management center 31 shown in the above-mentioned FIG.

As described above, according to the present embodiment, in addition to the effect of the above-described first embodiment, the impedance value is calculated from the measured value V S (n) of the harmonic voltage of the harmonic filter and the measured value I S (n) of the harmonic current. Since the change can be detected, amplification of the harmonic current I PCC (n) at the interconnection point 3 due to the impedance change can be suppressed.

  FIG. 22 is a diagram illustrating a configuration of a main part of a photovoltaic power generation system according to Example 6 according to another embodiment of the present invention. In the above-described first to fifth embodiments, the wind power generation apparatus 1 is described as an example of the power generation apparatus, and the wind power generation system 100 is described as an example of the power generation system. In the present embodiment, a case where the solar power generation device 6 is used as a power generation device instead of the wind power generation device 1 will be described. The same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted below.

As shown in FIG. 22, the solar power generation system includes a solar power generation device 6, a cable 2, and a power system 4 (commercial power system), and the solar power generation device 6 includes a cable 2 and a connection point 3. Via the power grid 4.
The solar power generation device 6 includes a solar panel 61 in place of the rotor 11 and the generator 12 constituting the wind power generation device 1 shown in FIG. The harmonic filter 14 constituting the solar power generation device 6 has the same configuration as the harmonic filter shown in the first to fifth embodiments, and in the solar power generation device 6 and the solar power generation system, The same effects as those of the first to fifth embodiments described above can be achieved.

  FIG. 23 is a diagram illustrating a configuration of a main part of the power storage system according to the seventh embodiment according to another embodiment of the present invention. In the above-described first to fifth embodiments, the wind power generation apparatus 1 is described as an example of the power generation apparatus, and the wind power generation system 100 is described as an example of the power generation system. In the present embodiment, a case where the storage battery power generation device 7 is used as a power generation device instead of the wind power generation device 1 will be described. The same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted below.

As shown in FIG. 23, the power storage system includes a storage battery power generation device 7, a cable 2, and a power system 4 (commercial power system), and the storage battery power generation device 7 is connected to the power system 4 via the cable 2 and the interconnection point 3. Be linked to
The storage battery power generation device 7 includes a storage battery 71 instead of the rotor 11 and the generator 12 that constitute the wind power generation device 1 shown in FIG. The storage battery power generation device 7 charges the storage battery 71 with, for example, late-night power from the power system 4 and discharges the power from the storage battery 71 to send the power to the power system 4. The harmonic filter 14 constituting the storage battery power generation device 7 has the same configuration as the harmonic filter shown in the above-described first to fifth embodiments, and the storage battery power generation device 7 and the power storage system also include the above-described embodiment. The same operational effects as those of the first to fifth embodiments can be obtained.

  The present invention is not limited to the first to seventh embodiments described above, and includes various modifications. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.

DESCRIPTION OF SYMBOLS 1 ... Wind power generator 2 ... Cable 3 ... Connection point 4 ... Power system 5 ... Communication network 6 ... Solar power generator 7 ... Storage battery power generator 11 ... Rotor 12 ... Generator 13 ... Power converter 14 ... Harmonic filter 15 ... Tap settling device 16 ... Resonance gain inspection unit 17 ... Voltage sensor 18 ... Current sensor 21 ··· Tower 22 ··· Nacelle 23 ··· Hub 24 · · · Blade 25 · · · Spindle 26 · · · Shrink disk 27 · · · Speed-up gear 28 · · · Main frame 29 · · · Control device 30 .. Sensor 31 ... Operation management center 32 ... Electronic terminal 41 ... System impedance 42 ... Power source 61 ... Solar panel)
71 ... Storage battery 100 ... Wind power generation system 141 ... Reactor 142 ... Tap switching reactor 143 ... Capacitor 144 ... Parallel reactor 145 ... Reactor switch 146 ... Parallel capacitor 147 ... Capacitor switch 148 ... First tap switching reactor 149 ... Second tap switching reactor 151 ... Connection tap determining unit 151
152, 162, 1423 ... display units 153, 163 ... input units 154a, 164a ... input I / F
154b, 164b ... Output I / F
155 ... FFT
156, 166 ... storage units 157, 167 ... communication I / F
158, 168 ... Internal bus 159 ... Harmonic current estimation unit 161 ... Impedance change detection unit 1421 ... Tap switching reactor panel 1422 ... Tap operation unit

Claims (15)

  1. At least a power converter that converts a frequency of generated power and sends it to an electric power system, and a harmonic filter disposed between the power converter and the electric power system,
    AC connected to the power system via cables and interconnection points,
    The said harmonic filter adjusts an inductance or an electrostatic capacitance so that amplification of the harmonic current in the said connection point may be suppressed.
  2. The power generator according to claim 1,
    The harmonic filter is
    A capacitor,
    A reactor to which a plurality of taps are attached, and a tap switching reactor capable of switching connection between any one of the plurality of taps and the terminal of the reactor,
    The said tap switching reactor switches the tap connected to the terminal of the said reactor so that the amplification of the harmonic current in the said connection point may be suppressed, and adjusts an inductance.
  3. The power generator according to claim 1,
    The harmonic filter is
    A capacitor,
    A plurality of reactors connected in parallel and a plurality of switches connected in series to each reactor;
    A power generator characterized by adjusting inductance so as to suppress amplification of harmonic current at the interconnection point by switching short-circuiting or opening of the plurality of switches and switching the number of connections of the reactors.
  4. The power generator according to claim 1,
    The harmonic filter is
    Reactor,
    A plurality of capacitors connected in parallel, and a plurality of switches connected in series to each capacitor;
    A power generator that adjusts the capacitance so as to suppress amplification of harmonic current at the interconnection point by switching between short-circuiting or opening of the plurality of switches and switching the number of connections of the capacitors.
  5. The power generator according to claim 2,
    The harmonic filter is
    A display unit;
    When the measured value of the harmonic current flowing through the interconnection point is compared with the preset upper limit value of the interconnection rule, and the measured value of the harmonic current flowing through the interconnection point is less than or equal to the upper limit value of the interconnection rule Determining a tap to be connected to the terminal of the reactor, and when a measured value of the harmonic current flowing through the connection point exceeds the upper limit value of the connection specification, a connection tap determination unit that outputs an alarm to the display unit; A power generation device comprising a tap settling device.
  6. The power generator according to claim 2,
    The harmonic filter is
    A display unit;
    Based on the harmonic voltage of the power converter and the resonance gain when each tap is connected to the terminal of the reactor, soaring to obtain an estimated value of the harmonic current flowing through the interconnection point is a current estimation unit,
    When the estimated value of the harmonic current flowing through the interconnection point is compared with the preset upper limit value of the interconnection rule, and the estimated value of the harmonic current flowing through the interconnection point is less than or equal to the upper limit value of the interconnection rule Determining a tap to be connected to the terminal of the reactor, and when the estimated value of the harmonic current flowing through the interconnection point exceeds the upper limit value of the interconnection regulation, a connection tap determining unit that outputs an alarm to the display unit; A power generation device comprising a tap settling device.
  7. The power generator according to claim 2,
    The harmonic filter is
    A voltage sensor that measures the harmonic voltage;
    A current sensor for measuring harmonic currents;
    Based on the measured value of the harmonic voltage and the measured value of the harmonic current, a combined impedance of the harmonic filter, the cable, and the power system is obtained, and an error between the obtained combined impedance and a preset set value of the combined impedance And an impedance change detector that detects a change in the combined impedance by comparing with a predetermined allowable value.
  8. The power generator according to claim 2,
    The harmonic filter is
    A current sensor for measuring harmonic currents;
    An error between the harmonic current set value obtained in advance based on the harmonic impedance of the harmonic filter and the cable and the power system and the harmonic voltage of the power converter and the measured value of the harmonic current by the current sensor. An electric power generation apparatus comprising: an impedance change detection unit configured to detect a change in combined impedance by comparing with a predetermined allowable value.
  9. The power generator according to any one of claims 1 to 8,
    A device for supplying generated power to the power converter is any one of a rotor, a generator, a solar panel, and a storage battery that constitute a wind power generator.
  10. At least one power generation device, an electronic terminal, and a communication network that connects these devices so that they can communicate with each other,
    The power generator is
    At least a power converter that converts the frequency of the generated power and sends the power to the power system, and a harmonic filter disposed between the power converter and the power system,
    AC connected to the power system via cables and interconnection points,
    The said harmonic filter adjusts an inductance or an electrostatic capacitance so that amplification of the harmonic current in the said connection point may be suppressed.
  11. The power generation system according to claim 10,
    The harmonic filter is
    A capacitor,
    A reactor to which a plurality of taps are attached, and a tap switching reactor capable of switching connection between any one of the plurality of taps and the terminal of the reactor,
    The said tap switching reactor switches the tap connected to the terminal of the said reactor so that amplification of the harmonic current in the said connection point may be suppressed, and adjusts an inductance.
  12. The power generation system according to claim 10,
    The harmonic filter is
    A capacitor,
    A plurality of reactors connected in parallel and a plurality of switches connected in series to each reactor;
    A power generation system characterized by adjusting inductance so as to suppress amplification of harmonic current at the interconnection point by switching short-circuiting or opening of the plurality of switches and switching the number of connections of the reactors.
  13. The power generation system according to claim 10,
    The harmonic filter is
    Reactor,
    A plurality of capacitors connected in parallel, and a plurality of switches connected in series to each capacitor;
    A power generation system, wherein capacitance is adjusted so as to suppress amplification of harmonic current at the interconnection point by switching short-circuiting or opening of the plurality of switches and switching the number of connections of the capacitors.
  14. The power generation system according to claim 11,
    The harmonic filter or the electronic terminal is
    A display unit;
    When the measured value of the harmonic current flowing through the interconnection point is compared with the preset upper limit value of the interconnection rule, and the measured value of the harmonic current flowing through the interconnection point is less than or equal to the upper limit value of the interconnection rule Determining a tap to be connected to the terminal of the reactor, and when a measured value of the harmonic current flowing through the connection point exceeds the upper limit value of the connection specification, a connection tap determination unit that outputs an alarm to the display unit; A power generation system comprising a tap settling device.
  15. The power generation system according to claim 11,
    The harmonic filter or the electronic terminal is
    A display unit;
    Based on the harmonic voltage of the power converter and the resonance gain when each tap is connected to the terminal of the reactor, soaring to obtain an estimated value of the harmonic current flowing through the interconnection point is a current estimation unit,
    When the estimated value of the harmonic current flowing through the interconnection point is compared with the preset upper limit value of the interconnection rule, and the estimated value of the harmonic current flowing through the interconnection point is less than or equal to the upper limit value of the interconnection rule Determining a tap to be connected to the terminal of the reactor, and when the estimated value of the harmonic current flowing through the interconnection point exceeds the upper limit value of the interconnection regulation, a connection tap determining unit that outputs an alarm to the display unit; A power generation system comprising a tap settling device.
JP2017136838A 2017-07-13 2017-07-13 Power generation device and power generation system Pending JP2019022272A (en)

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JPS5612821A (en) * 1979-07-13 1981-02-07 Tokyo Shibaura Electric Co Harmonic wave switching filter
JPH08126347A (en) * 1994-10-20 1996-05-17 Canon Inc Inverter and solar power generation system using it
JP4715624B2 (en) * 2006-05-09 2011-07-06 富士電機システムズ株式会社 Power stabilization system, power stabilization control program, and power stabilization control method
JP5814716B2 (en) * 2011-09-27 2015-11-17 株式会社東芝 Harmonic resonance avoidance system for AC transmission system
WO2014125649A1 (en) * 2013-02-18 2014-08-21 富士電機株式会社 Resonance suppression device
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