KR20170112063A - Apparatus and method for controlling converters of wind turbine system - Google Patents

Abstract

The present invention relates to a converter control apparatus and method for a wind power generation system, and more particularly, to a technique for maximizing the lifetime of a converter by making each of a plurality of parallel-connected converters included in a wind power generation system have the same drive time.
One problem to be solved by the proposed invention is to drive a plurality of converters connected in parallel from a converter having a small cumulative drive time so as to equalize the drive times of the plurality of converters and thereby to prevent the life of the specific converter from being shortened .
According to an aspect of the present invention, a converter control apparatus of a wind power generation system may be configured to drive a converter having the smallest cumulative drive time when driving any one of a plurality of converters connected in parallel between a generator and a system, And a converter driving unit for driving a converter of the next sequential number of the last driven converter based on the driving order.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus and method for controlling a converter of a wind turbine,

The present invention relates to a converter control apparatus and method for a wind power generation system, and more particularly, to a technique for maximizing the lifetime of a converter by making each of a plurality of parallel-connected converters included in a wind power generation system have the same drive time.

Wind turbines convert the kinetic energy of the wind into mechanical energy by rotating the blades. The converted mechanical energy is converted into electric energy through the generator.

There may be a plurality of converters between the generator of the wind power generator and the system. When the wind blows, the blades of the wind turbine rotate, and the kinetic energy resulting from the rotation of the blades is converted into electrical energy through the generator. The electric energy generated and converted by the generator is converted into the direct current by the above-described converter by the alternating current power, and is converted into the alternating current to be supplied in the direction of the system again.

According to the above-described process, when the wind blows, any one of the plurality of converters must be driven. There is a problem in that only one of the plurality of converters is always driven as long as the generator does not generate a large amount of electric power as the wind speed increases and the lifetime of the frequently driven converter is shortened.

In addition, even when two or more converters are required to operate, the constantly fixed converter is driven at all times, thereby reducing the lifetime of the driven converter at all times.

One problem to be solved by the proposed invention is to drive a plurality of converters connected in parallel from a converter having a small cumulative drive time so as to equalize the drive times of the plurality of converters and thereby to prevent the life of the specific converter from being shortened .

Another problem to be solved by the present invention is to stop the operation of the converter from a converter having a large cumulative drive time among a plurality of converters to equalize drive times of the plurality of converters, thereby preventing the life of the specific converter from being shortened.

Another problem to be solved by the proposed invention is to drive the converters of the next order of the last driven converter based on the driving order of the converters among the plurality of converters to make the driving times of the plurality of converters equal, Thereby preventing the life of the converter from being shortened.

Another problem to be solved by the proposed invention is to stop driving the converter of the next sequential number of the converter that has been last stopped based on the order of stopping the operation of the set converter among the plurality of the converters to make the driving times of the plurality of converters equal , Thereby preventing the life of a particular converter from being shortened.

Another object of the present invention is to drive a switching device module having a small cumulative driving time among a plurality of switching device modules included in a converter so as to equalize the driving time of the plurality of switching device modules, Thereby preventing the life of the module from being shortened.

Another problem to be solved by the proposed invention is to stop the driving of the switching element module having a large cumulative driving time among the plurality of switching element modules included in the converter to make the driving time of the plurality of switching element modules equal, Thereby preventing the life of the switching element module from being shortened.

Another object of the present invention is to drive a switching device module of the next sequential order of the last driven switching device module based on the driving sequence of the switching device modules among the plurality of switching device modules included in the converter, The drive time of the device module is made equal, thereby preventing the lifetime of the specific switching device module from being shortened.

Another problem to be solved by the proposed invention is to stop driving of the switching element module of the next sequential order of the switching element module which was last stopped to operate based on the order of stopping the switching element module among the plurality of switching element modules included in the converter So that the driving time of the plurality of switching element modules is made equal, thereby preventing the life of the specific switching element module from being shortened.

According to an aspect of the present invention, a converter control apparatus of a wind power generation system may be configured to drive a converter having the smallest cumulative drive time when driving any one of a plurality of converters connected in parallel between a generator and a system, And a converter driving unit for driving a converter of the next sequential number of the last driven converter based on the driving order.

In another aspect, the converter control device of the wind power generation system further includes a cumulative driving time calculating section for calculating cumulative driving time in which driving time for each of the plurality of converters is accumulated, And when the converter is to be driven, the converter having the smallest cumulative drive time is driven.

In another aspect, the converter driving unit may stop driving the converter having the largest cumulative driving time when the driving of any one of the at least one converter in operation is to be stopped.

In another aspect, the cumulative driving time calculating section calculates cumulative driving time in which driving time for each of a plurality of switching element modules included in the converter is accumulated, and the converter driving section calculates the cumulative driving time When a switching element module of any one of a plurality of switching element modules connected in parallel including a small converter is to be driven, the switching element module having the smallest cumulative driving time can be driven.

In another aspect, the converter driving unit stops driving the switching element module having the largest cumulative driving time when stopping driving of any one of the switching element modules in operation .

In another aspect of the present invention, the converter control device of the wind power generation system further includes an order setting section for setting a driving order of the plurality of converters, and when the converter drive section drives one of the plurality of converters, And the converter of the next sequential order of the last driven converter is driven based on the driving order of the converter.

In another aspect, the order setting unit is configured to set a driving stop order of at least one converter in operation, and in a case where driving of any one of the at least one converter in operation is to be stopped, And stopping the driving of the converter of the next sequential number of the converter that was last driven off based on the driving stop order of the converter.

In another aspect, the order setting unit sets a driving order of a plurality of switching element modules included in the converter, and the converter driving unit sets the order of the converters of the next order of the converters last driven based on the driving order of the set converters When the switching device module of any one of the plurality of switching elements connected in parallel is to be driven, the switching device module of the next sequential order of the last driven switching device module is driven based on the driving sequence of the set switching device module .

In another aspect, the order setting unit sets a driving stop order of at least one switching element module in operation, and the converter driving unit controls the driving of one of the at least one switching element module And stopping the driving of the switching element module of the next sequential order of the switching element module that was lastly driven off based on the driving stop order of the set switching element module.

The proposed invention can drive a plurality of converters connected in parallel from a converter having a small cumulative drive time to equalize the drive time of the plurality of converters, thereby preventing the life of a specific converter from being shortened.

The proposed invention can stop driving from a converter having a large cumulative drive time among a plurality of converters to make the drive times of the plurality of converters equal, thereby preventing the life of a specific converter from being shortened.

The proposed invention drives the converters of the next sequential number of the last driven converter based on the driving order of the set converters among the plurality of converters to make the driving times of the plurality of converters equal to shorten the lifetime of the specific converters .

The proposed invention stops driving the converter of the next sequential number of the converter that was last driven off based on the driving stopping order of the set converters among the plurality of converters so as to equalize the driving time of the plurality of converters, Can be prevented from being shortened.

The proposed invention drives a switching element module having a small cumulative driving time among a plurality of switching element modules included in a converter to equalize the driving time of the plurality of switching element modules, thereby shortening the lifetime of a specific switching element module .

The proposed invention stops operation from a switching element module having a large cumulative driving time among a plurality of switching element modules included in the converter, so that the driving time of the plurality of switching element modules is made equal, thereby shortening the lifetime of the specific switching element module Can be prevented.

The proposed invention drives a switching element module of the next sequential order of the last driven switching element module based on the driving order of the switching element modules among the plurality of switching element modules included in the converter, So that the lifetime of the specific switching element module can be prevented from being shortened.

The proposed invention stops the driving of the switching element module of the next sequential order of the switching element module that was last driven off based on the order of stopping the driving of the switching element module among the plurality of switching element modules included in the converter, It is possible to equalize the driving time and thus to prevent the lifetime of the specific switching element module from being shortened.

Figure 1 shows the overall configuration of a wind power generation system.
2 shows a configuration of a converter control apparatus of a wind power generation system according to an embodiment.
3 shows a flow of a converter control method of a wind power generation system according to an embodiment.
FIG. 4 shows a configuration of a switching element module 200 according to an embodiment.

The foregoing and further aspects are embodied through the embodiments described with reference to the accompanying drawings. It is to be understood that the components of each embodiment are capable of various combinations within an embodiment as long as no other mention or mutual contradiction exists. Furthermore, the proposed invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the claimed invention, parts not related to the description are omitted, and like reference numerals are used for like parts throughout the specification. And, when a section is referred to as "including " an element, it does not exclude other elements unless specifically stated to the contrary.

In addition, throughout the specification, when a part is referred to as being "connected" to another part, it is not limited to a case where it is "directly connected", but also an "electrically connected" . Further, in the specification, a signal means a quantity of electricity such as a voltage or a current.

As used herein, the term " block " refers to a block of hardware or software configured to be changed or pluggable, i.e., a unit or block that performs a specific function in hardware or software.

Figure 1 shows the overall configuration of a wind power generation system.

The wind power generation system includes a blade 10, a gear box, a generator 40, a plurality of converters 50-1, 50-2 and 50-n, a transformer 70 and a converter control device 100 of a wind power generation system .

In one embodiment, the blades 10 are rotated by wind energy to generate kinetic energy. That is, the blade 10 is a machine that converts the energy of a fluid such as water, gas, or steam into mechanical work. The blades 10 may be embodied in a vertical or horizontal orientation with the ground and include one or more blades.

In one embodiment, the gear box 30 is located between the blades 10 and the rotor of the generator 40 described below. The gear box 30 has a low wind speed and functions to increase the rotational speed of the rotor of the generator 40 when the rotational speed of the blade 10 is low.

In one embodiment, the energy generated by the fluid is converted into rotational force by the rotor, and then the rotational force is used to generate electricity. That is, the generator 40 is a device that converts mechanical energy into electrical energy. As the generator 40, a synchronous machine or an induction machine is largely used, and the synchronous machine can be divided into a winding machine type and a permanent magnet type according to the form of the field. The induction machine can be classified into a spiral type and a winding type according to the structure of the rotor. In particular, the wire-wound induction machine, the wire-wound induction generator 40 or the induction generator 40 can be installed in a place characterized by a variable wind speed.

In one embodiment, converters 50-1, 50-2, and 50-n include a DC link connecting an AC / DC converter, a DC / AC inverter, and an AC / DC converter and a DC / AC inverter. The converters 50-1, 50-2 and 50-n are connected in parallel between the generator 40 and a transformer 70 to be described later. Figure 1 shows n parallel connected converters 50-1, 50-2, 50-n.

The AC / DC converter converts the three-phase AC output from the generator 40 into a DC form. The DC / AC inverter converts the converted DC power into AC power suitable for use on the grid side. DC links can be connected in parallel to AC / DC converters and DC / AC inverters to transfer energy between AC / DC converters and DC / AC inverters. The DC link can be implemented as a capacitor, but any device capable of charging and discharging energy can be used as a DC link.

In one embodiment, converters 50-1, 50-2, and 50-n include one or more switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1 , 60-2-2, 60-2-m, 60-n-1, 60-n-2, 60-nm. 1 is a block diagram showing a configuration of m parallel-connected switching elements 60-1-1, 60-1-2, 60-1-m and 60-2-m including the converters 50-1, 50-2 and 50- 1, 60-2-2, 60-2-m, 60-n-1, 60-n-2, 60-nm. The above-mentioned AC / DC converter includes six switching elements, and the DC / AC inverter also includes six switching elements. The above-mentioned switching elements may be transistors, for example, gate turnoff thyristors (GTO), insulated gate bipolar transistors (IGBTs), integrated gate commutated thyristors (IGCTs), bipolar junction transistors Oxide Semiconductor Field Effect Transistor).

The AC power output from the generator 40 is three-phase AC power. Each phase is connected to two switching elements of the AC / DC converter. Each phase of the three-phase AC power supplied to the system is connected to two switching Lt; / RTI > That is, two of the six switching elements of the AC / DC converter operate so that current can flow in one phase. Two of the six switching devices of the DC / AC inverter operate so that current can flow through one phase.

In one embodiment, the switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- 1, 60-n-2, 60-nm includes six switching elements of an AC / DC converter and six switching elements of a DC / AC inverter. The switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- 2, and 60-nm are connected in parallel to constitute one converter 50-1, 50-2, and 50-n.

In one embodiment, the transformer 70 is connected to the grid as a portion that changes the value of the AC voltage or current using electromagnetic induction. Here, the system means a power system in which the wind power generation system is connected.

2 shows a configuration of a converter control apparatus 100 of a wind power generation system according to an embodiment.

In an aspect, the converter control apparatus 100 of the wind power generation system includes a converter driving unit 110. [ The converter driving unit 110 drives at least one of the n converters 50-1, 50-2, and 50-n described above.

In one embodiment, the converter driving unit 110 includes any one of the converters 50-1, 50-2, and 50-n among the plurality of converters 50-1, 50-2, and 50-n connected in parallel between the generator 40 and the system 50-2, and 50-n, the converters 50-1, 50-2, and 50-n having the smallest cumulative drive time are driven, or the converters 50-1, 50-2, and 50- 50-2, and 50-n of the last driven converters 50-1, 50-2, and 50-n based on the driving sequence of the first-order converters 50-1, 50-2, and 50-n.

The fact that the converter is driven means that a plurality of switching elements among twelve switching elements included in at least one switching element module among the plurality of switching element modules included in the converter are turned on. The twelve switch elements included in the switching element module are shown in Fig. What is required among the twelve switching elements included in the switching element module to transmit the three-phase AC signals to the system so that they are different from each other by 120 degrees is what the element is and when the switch should be turned on and off has a common knowledge in the field of converters It is clear to the person.

When the wind is blown, the blade 10 of the wind power generator 40 is rotated, and the kinetic energy resulting from the rotation of the blade 10 is converted into electric energy through the generator 40. The electric energy generated by the generator 40 is converted into a direct current by the converters 50-1, 50-2, and 50-n described above by the alternating current power, and is converted into the alternating current to be supplied in the system direction again. As a result, at least one of the converters 50-1, 50-2, and 50-n must be driven according to the magnitude of the wind speed so that AC power can be supplied to the system. At least one of the converters 50-1, 50-2, and 50-n must be driven when the wind is suddenly blowing. When the wind blows more strongly, power exceeding the rated capacity of the converters 50-1, 50-2, and 50-n that are already in operation is supplied, so that the other converters 50-1, 50-2, 50-n) must be newly driven.

As described above, when one of the converters 50-1, 50-2, and 50-n is to be driven, the time during which the converters 50-1, 50-2, and 50- Driving the converters 50-1, 50-2, and 50-n having the smallest time can equalize the driving time of the plurality of converters 50-1, 50-2, and 50-n, It is possible to prevent the life of the specific converters 50-1, 50-2, and 50-n from being shortened. Further, based on the drive sequence of the set converters 50-1, 50-2, and 50-n, the converters 50-1, 50-2, and 50- 50-2, and 50-n, the driving times of the plurality of converters 50-1, 50-2, and 50-n can be made equal, and accordingly, the specific converters 50-1 and 50- -2, and 50-n can be prevented from being shortened.

In one embodiment, the converter control apparatus 100 of the wind power generation system includes a cumulative driving time (hereinafter referred to as " cumulative driving time ") for calculating a cumulative driving time in which driving time for each of the plurality of converters 50-1, 50-2, any one of the converters (50-1, 50-2, 50-n of further comprising a calculation unit 120, the converter driver 110 includes a plurality of converters (50-1, 50-2, 50-n) , The converters 50-1, 50-2, and 50-n having the smallest cumulative drive time are driven.

In one embodiment, the cumulative driving time calculating section 120 stores the driving time until the converters 50-1, 50-2, and 50-n start driving and stop driving, and the above- 50-1, 50-2, and 50-n start driving again and add the driving time, which is the time at which the driving is stopped, to the driving time. That is, the cumulative driving time calculating unit 120 accumulates the driving time driven by the converters 50-1, 50-2, and 50-n in real time. The cumulative drive time calculating unit 120 calculates the cumulative drive time of the converter 50-1 by 1 hour and 14 minutes, the converter 50-2 by 1 hour and 30 minutes, For the converter 50-n, and 50 minutes for the converters 50-1, 50-2, and 50-n.

In one embodiment, the converter driving unit 110 drives one of the converters 50-1, 50-2, and 50-n of the plurality of converters 50-1, 50-2, and 50-n The converters 50-1, 50-2, and 50-n having the smallest cumulative drive time are driven. When one of the converters 50-1, 50-2, and 50-n of the plurality of converters 50-1, 50-2, and 50-n is to be driven, the wind is not blown but the wind suddenly blows And the case where the wind blows more strongly. The converter driving unit 110 outputs the smallest drive time among the cumulative drive times of the n converters 50-1, 50-2, and 50-n calculated by the cumulative drive time calculating unit 120, The converter 50-1, 50-2, and 50-

The plurality of converters 50-1, 50-2, and 50-n are driven from the converters 50-1, 50-2, and 50-n having the small cumulative drive time among the plurality of converters 50-1, 50-2, , 50-n can be made equal and the life of the specific converters 50-1, 50-2, 50-n can be prevented from being shortened.

In one embodiment, the converter driving unit 110 is configured to control the operation of one of the converters 50-1, 50-2, and 50-n of the one or more converters 50-1, 50-2, The driving of the converters 50-1, 50-2, and 50-n having the largest accumulated driving time is stopped. If the driving of any one of the converters 50-1, 50-2, and 50-n of the one or more converters 50-1, 50-2, and 50-n in operation is to be stopped, And when the wind blows and the wind blows more weakly. The converter driving unit 110 outputs the largest drive time among the cumulative drive times of the n converters 50-1, 50-2, and 50-n calculated by the cumulative drive time calculating unit 120, And stops the operation of the converters 50-1, 50-2, and 50-n. Stopping the driving of the converters 50-1, 50-2 and 50-n means that one or more switching element modules 60-1 to 60-n, which are included in the converters 50-1, 50-2 and 50- 60-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- One switching element module 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- n-2, and 60-nm. Stopping the driving of the switching element module means turning off all twelve switches included in the switching element module.

The driving of the plurality of converters 50-1, 50-2, and 50-n is stopped from the converters 50-1, 50-2, and 50-n having the large cumulative driving time, -2, and 50-n can be made equal to each other and thus the life of the specific converters 50-1, 50-2, and 50-n can be prevented from being shortened.

In one embodiment, the cumulative driving time calculating section 120 calculates the cumulative driving time of each of the plurality of switching element modules 60-1-1, 60-1-2 (60-1-1, 60-1-2) included in the converters 50-1, 50-2, , 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2 and 60- Wherein the converter driving unit 110 includes a plurality of switching elements 60 connected in parallel to each other including the converters 50-1, 50-2 and 50-n having the smallest cumulative driving time -1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- 60-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1 , 60-n-2, and 60-nm, the switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1 , 60-2-2, 60-2-m, 60-n-1, 60-n-2, 60-nm. The fact that the switching element module is driven means that a plurality of switching elements among the twelve switching elements included in the switching element module are turned on. What is required among the twelve switching elements included in the switching element module to transmit the three-phase AC signals to the system so that they are different from each other by 120 degrees is what the element is and when the switch should be turned on and off has a common knowledge in the field of converters It is clear to the person.

In one embodiment, the cumulative drive time calculating unit 120 includes switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60 2-m, 60-n-1, 60-n-2, and 60-nm start driving and stop driving, and the switching elements 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- Which is the time at which the driving is started and the driving is stopped, is summed with the driving time at which the driving time is stored. The cumulative driving time calculating section 120 calculates the cumulative driving time of the switching element module 60-1-1 for 1 hour and 14 minutes by taking the case of the converter 50-1 shown in FIG. -2) for 1 hour and 30 minutes, ... And for the switching element module 60-1-m, the cumulative driving time that has been performed up to now for the m switching element modules 60-1-1, 60-1-2, 60-1-m is 50 minutes, And stores it.

The cumulative drive time calculating unit 120 does not calculate only the drive time of the switching element modules 60-1-1, 60-1-2, and 60-1-m included in the converter 50-1, The switching element modules 60-1-1 and 60-1-2 included in each of the converters 50-1, 50-2 and 50-n are connected to the converters 50-1, 50-2 and 50- , 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2, 60-nm.

In one embodiment, the converter driving unit 110 includes a plurality of parallel-connected switching device modules 60-1-1 and 60-n including the converters 50-1, 50-2 and 50-n having the smallest cumulative driving time 60-1, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- The device modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- , 60-nm), the switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2 having the smallest cumulative driving time , 60-2-m, 60-n-1, 60-n-2, and 60-nm. A plurality of switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1 and 60-n connected in parallel included in the converters 50-1, 50-2 and 50- (60-1-1, 60-1-2, 60-1) of any one of the switching element modules (60-1-1, 60-1-2, 60-2-m, 60-n- 60, 60-2, 60-2-m, 60-n-1, 60-n-2, 60-nm) And when the wind blows, the wind is blown more strongly. The fact that the converters 50-1, 50-2 and 50-n are driven means that the switching element modules 60-1-1 and 60-1-2 included in the converters 50-1, 50-2 and 50- 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- 60-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- . In the case where one of the converters 50-1, 50-2, and 50-n needs to be driven, the converter driving unit 110 may be configured such that the converters 50-1, 50-2, and 50- The switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n- 1, 60-n-2, and 60-nm.

The plurality of switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- 60-1-1, 60-2-1, 60-2-1, 60-2-1, 60-2-2, and 60- 60-1, 60-1-m, 60-2, 60-1, 60-2, and 60-nm by driving the plurality of switching element modules 60-1-1, 60-1-2, 60-1- 60-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2 and 60-nm are equalized and accordingly, the specific switching element modules 60-1- 60-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- Can be prevented from being shortened.

In one embodiment, the converter driving unit 110 includes at least one switching element module 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2 (60-1-1, 60-1-2, 60-1-m, 60-n-1, 60-1-m, 60-1- 2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2 and 60-nm, (60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- -nm) is stopped. (60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- (60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-nm) among the switching element modules 60-1 to 60- 2-m, 60-n-1, 60-n-2, and 60-nm must be stopped when the wind blows but is not blown or when the wind blows weakly. In the case of the above-described case, the converter driving unit 110 calculates, for example, m converters 50-1 calculated by the cumulative driving time calculating unit 120, The modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- 60-nm.

In one embodiment, the converter control apparatus 100 of the wind power generation system further includes a sequence setting section 130 for setting a sequence of driving the plurality of converters 50-1, 50-2, and 50-n , When the converter driving unit 110 drives one of the converters 50-1, 50-2, and 50-n among the plurality of converters 50-1, 50-2, and 50-n, (50-1, 50-2) of the next sequential converter of the converters (50-1, 50-2, 50-n) that were last driven based on the driving sequence of the converters (50-1, , 50-n.

In one embodiment, the order setting unit 130 sets the driving order of the plurality of converters 50-1, 50-2, and 50-n. For example, the order setting unit 130 includes a converter 50-1, a converter 50-2, ..., , And the converter 50-n in that order. The order setting step sets the driving order of the converters 50-1, 50-2, and 50-n is not limited to the above example, and the odd-numbered converters 50-1 and 50-3 , ...) are sequentially driven first, and then the even-numbered converters 50-2, 50-4, ... are sequentially driven in order of increasing number.

In one embodiment, when the driving unit 110 drives one of the converters 50-1, 50-2, and 50-n of the plurality of converters 50-1, 50-2, and 50-n The converters 50-1, 50-2, and 50-n of the next sequential order of the converters 50-1, 50-2, and 50-n that were last driven based on the driving sequence of the set converters 50-1, 50-2, 50-2, and 50-n. When one of the converters 50-1, 50-2, and 50-n of the plurality of converters 50-1, 50-2, and 50-n is to be driven, the wind is not blown but the wind suddenly blows And the case where the wind blows more strongly. The converter driving unit 110 drives the converters 50-1, 50-2, and 50-n that are driven last based on the driving order of the converters 50-1, 50-2, and 50-n set by the order setting unit 130, -1, 50-2, and 50-n of the next sequential number of converters 50-1, 50-2, and 50-n.

In one embodiment, the order setting unit 130 sets a driving stop order of one or more of the converters 50-1, 50-2, and 50-n that are in operation. The converter driving unit 110, When it is necessary to stop the driving of any one of the converters 50-1, 50-2 and 50-n of the one or more converters 50-1, 50-2 and 50-n in operation, (50-1, 50-2) of the next sequential number of the converters (50-1, 50-2, 50-n) that were last driven off based on the drive stop orders of the first, , 50-n are stopped.

In one embodiment, the order setting unit 130 sets a driving stop order of one or more converters 50-1, 50-2, and 50-n that are being driven. For example, the order setting unit 130 includes a converter 50-1, a converter 50-2, ..., , And converter 50-n in this order. The order setting unit 130 sets the driving order of the converters 50-1, 50-2, and 50-n is not limited to the above example, and the odd-numbered converters 50-1, 50-3, ... are sequentially driven first, and then the even-numbered converters 50-2, 50-4, ... are sequentially driven in order of increasing number.

In one embodiment, the converter driving unit 110 is configured to control the operation of one of the converters 50-1, 50-2, and 50-n of the one or more converters 50-1, 50-2, (50-1, 50-2, and 50-n) of the converters 50-1, 50-2, and 50-n that were last driven off based on the driving stop orders of the converters 50-1, 50-2, And stops driving the converters 50-1, 50-2, and 50-n in the sequential order. If the driving of any one of the converters 50-1, 50-2, and 50-n of the one or more converters 50-1, 50-2, and 50-n in operation is to be stopped, And when the wind blows and the wind blows more weakly. The converter driving unit 110 drives the converters 50-1, 50-2, and 50-n that are last driven off based on the driving stop orders of the converters 50-1, 50-2, and 50- The driving of the converters 50-1, 50-2, and 50-n of the next sequential order of the converters 50-1, 50-2, and 50-n is stopped.

In one embodiment, the order setting unit 130 includes a plurality of switching element modules 60-1-1, 60-1-2, and 60-n included in the converters 50-1, 50-2, and 50- setting the driving sequence of the -1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2, 60-nm), and the converter drive unit ( 110 are connected to the converters 50-1, 50-2, and 50-n of the next sequential order of the converters 50-1, 50-2, and 50-n that were last driven based on the driving sequence of the set converters 50-1, 50-2, 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-1, 60-2-1, 60-2-1, 60-1-1, 60-1-2, 60-2-m, 60-n-1, 60-n-2, 60- 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2 and 60-nm, , 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- 60-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n -1, 60-n-2, 60-nm) 60-1, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60-n -2, and 60-nm).

In one embodiment, the order setting unit 130 includes a plurality of switching element modules 60-1-1, 60-1-2, and 60-n included in the converters 50-1, 50-2, and 50- -1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2, and 60-nm. For example, the order setting unit 130 sets the switching device module 60-1-1, ..., , And the switching element module 60-1-m. The order setting unit 130 sets the switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n -1, 60-n-2, and 60-nm are not limited to the above-described examples, and the odd-numbered switching element modules 60-1-1 and 60-1- 3, ..., 60-2-1, 60-2-3, ..., 60-n-1, 60-n-3, ... are driven first and then the even- 1-2, 60-1-4, ..., 60-2-2, 60-2-4, ..., 60-n-2, 60-n-4,.

In one embodiment, the converter driving unit 110 drives the converters 50-1, 50-2, and 50-n that were last driven based on the driving order of the converters 50-1, 50-2, 60-1, 60-1-m, and 60-n, which are included in the converter 50-1, 50-2, 50- 60-1-1, 60-1-2, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- 2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2, 60- The device modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- , 60-1-m, 60-2-1, 60-2-2, and 60-nm that are driven last based on the driving sequence of the switching element modules 60-1-1, 60-1-2, 60-1-2, 60-1-m, 60-2-m, 60-n-1, 60- -1, 60-2-2, 60-2-m, 60-n-1, 60-n-2, and 60-nm. The plurality of switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- (60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-n) m, 60-n-1, 60-n-2, and 60-nm must be driven when the wind is suddenly blowing and when the wind blows more strongly. In the case described above, the converter driving unit 110 drives the switching element modules 60-1-1, 60-1-2, 60-1-m, and 60-2-1 set by the order setting unit 130, 60-1, 60-n, 60-nm, 60-2-2, 60-2-m, 60- N-1, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- The device modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- , 60-nm).

In one embodiment, the order setting unit 130 includes at least one switching element module 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2 (60), wherein the converter driving unit (110) is configured to set the driving stop order of one or more switching units ( 60, 60, 60 - 2, 60 - 2 - The device modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- 60-1, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-nm) of one of the switching element modules 60-1, 60-1-m, 60-2-m, 60-2, and 60-nm are to be stopped, the switching element modules 60-1-1, 60-1-2, 60-1- 60-1 to 60-n-1, 60-2-2, 60-2-m, 60-n-1, 60- 1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- The switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- n-2, 60-nm) And a gong.

In one embodiment, the order setting unit 130 sets one or more switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2- 2, 60-2-m, 60-n-1, 60-n-2, and 60-nm. For example, the order setting unit 130 sets the switching device module 60-1-1, ..., , And the switching element module 60-1-m. The order setting unit 130 sets the switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n 1, 60-n-2, and 60-nm are not limited to the above-described examples, but the odd-numbered switching element modules 60-1-1 and 60-1 3, ..., 60-2-1, 60-2-3, ..., 60-n-1, 60-n-3, ... are stopped first, , 60-n-2, 60-n-4, ... are stopped in the order of stopping the driving of the switches 60-1-2, 60-1-4, ..., 60-2-2, 60-2-4, Can be set.

In one embodiment, the converter driving unit 110 includes at least one switching element module 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2 (60-1-1, 60-1-2, 60-1-m, 60-n-1, 60-1-m, 60-1- 2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2 and 60-nm, the set switching element modules 60-1- 1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- The switching device modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-1-m, 60-2-1, 60-n-1, 60-n-2 and 60- 2-2, 60-2-m, 60-n-1, 60-n-2, and 60-nm. (60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- (60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-nm) among the switching element modules 60-1 to 60- 2-m, 60-n-1, 60-n-2, and 60-nm must be stopped when the wind blows but is not blown or when the wind blows weakly. In the case described above, the converter driving unit 110 drives the switching element modules 60-1-1, 60-1-2, 60-1-m, and 60-2-1 set by the order setting unit 130, 60-1 to 60-n-1, 60-n-1, 60-n-2 and 60-nm, , 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- The switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n- -2, and 60-nm.

3 shows a flow of a converter control method of a wind power generation system according to an embodiment.

In an aspect, a converter control method of a wind power generation system includes a converter driving step (S630). The converter driving step S630 drives at least one of the n converters 50-1, 50-2, and 50-n described above.

In one embodiment, the step of driving the converter (S630) includes the step of selecting any one of the converters (50-1, 50-2, 50-n) connected in parallel between the generator (40) 50-2, and 50-n are driven, the converters 50-1, 50-2, and 50-n having the smallest cumulative drive time are driven, or the converters 50-1, 50-2, 50-2, and 50-n) of the last driven converters 50-1, 50-2, and 50-n based on the driving sequence of the first-order converters 50-1, 50-n.

When the wind is blown, the blade 10 of the wind power generator 40 is rotated, and the kinetic energy resulting from the rotation of the blade 10 is converted into electric energy through the generator 40. The electric energy generated by the generator 40 is converted into a direct current by the converters 50-1, 50-2, and 50-n described above by the alternating current power, and is converted into the alternating current to be supplied in the system direction again. As a result, at least one of the converters 50-1, 50-2, and 50-n must be driven according to the magnitude of the wind speed so that AC power can be supplied to the system. At least one of the converters 50-1, 50-2, and 50-n must be driven when the wind is suddenly blowing. When the wind blows more strongly, power exceeding the rated capacity of the converters 50-1, 50-2, and 50-n that are already in operation is supplied, so that the other converters 50-1, 50-2, 50-n) must be newly driven.

As described above, when one of the converters 50-1, 50-2, and 50-n is to be driven, the time during which the converters 50-1, 50-2, and 50- Driving the converters 50-1, 50-2, and 50-n having the smallest time can equalize the driving time of the plurality of converters 50-1, 50-2, and 50-n, It is possible to prevent the life of the specific converters 50-1, 50-2, and 50-n from being shortened. Further, based on the drive sequence of the set converters 50-1, 50-2, and 50-n, the converters 50-1, 50-2, and 50- 50-2, and 50-n, the driving times of the plurality of converters 50-1, 50-2, and 50-n can be made equal, and accordingly, the specific converters 50-1 and 50- -2, and 50-n can be prevented from being shortened.

In one embodiment, a method of controlling a converter of a wind power generation system includes a cumulative drive time calculation step of calculating cumulative drive time accumulated for each of the plurality of converters 50-1, 50-2, and 50-n any one of the converters (50-1, 50-2, 50-n ) further comprises of the S610), and the converter driving step (S630) comprises a plurality of converters (50-1, 50-2, 50-n ) The converters 50-1, 50-2, and 50-n having the smallest cumulative drive time are driven.

In one embodiment, the cumulative driving time calculating step S610 stores the driving time until the converters 50-1, 50-2, and 50-n start driving and stop driving, 50-1, 50-2, and 50-n start driving again and add the driving time, which is the time at which the driving is stopped, to the driving time. That is, the cumulative driving time calculating step S610 accumulates the driving time driven by the converters 50-1, 50-2, and 50-n in real time. The cumulative drive time calculation step S610 is performed for one hour and fourteen minutes for the converter 50-1 and one hour and thirty minutes for the converter 50-2, For the converter 50-n, and 50 minutes for the converters 50-1, 50-2, and 50-n.

In one embodiment, the step S630 of driving the converter may be performed by driving one of the converters 50-1, 50-2, 50-n of the plurality of converters 50-1, 50-2, 50-n The converters 50-1, 50-2, and 50-n having the smallest cumulative drive time are driven. When one of the converters 50-1, 50-2, and 50-n of the plurality of converters 50-1, 50-2, and 50-n is to be driven, the wind is not blown but the wind suddenly blows And the case where the wind blows more strongly. The converter drive step S630 is performed in the case where the smallest of the cumulative drive times of the n converters 50-1, 50-2, and 50-n calculated in the cumulative drive time calculating step S610 Time converter 50-1, 50-2, and 50-n.

The plurality of converters 50-1, 50-2, and 50-n are driven from the converters 50-1, 50-2, and 50-n having the small cumulative drive time among the plurality of converters 50-1, 50-2, , 50-n can be made equal and the life of the specific converters 50-1, 50-2, 50-n can be prevented from being shortened.

In one embodiment, the step of driving the converter S630 includes the steps of selecting one of the converters 50-1, 50-2, and 50-n among the one or more converters 50-1, 50-2, The driving of the converters 50-1, 50-2, and 50-n having the largest accumulated driving time is stopped. If the driving of any one of the converters 50-1, 50-2, and 50-n of the one or more converters 50-1, 50-2, and 50-n in operation is to be stopped, And when the wind blows and the wind blows more weakly. The converter driving step S630 is performed in the case where the largest driving operation among the cumulative driving times of the n converters 50-1, 50-2, and 50-n calculated in the cumulative driving time calculating step S610 Stop the converters 50-1, 50-2, and 50-n having the time. Stopping the driving of the converters 50-1, 50-2 and 50-n means that one or more switching element modules 60-1 to 60-n, which are included in the converters 50-1, 50-2 and 50- 60-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- One switching element module 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- n-2, and 60-nm.

The driving of the plurality of converters 50-1, 50-2, and 50-n is stopped from the converters 50-1, 50-2, and 50-n having the large cumulative driving time, -2, and 50-n can be made equal to each other and thus the life of the specific converters 50-1, 50-2, and 50-n can be prevented from being shortened.

In one embodiment, the cumulative driving time calculating step S610 includes a plurality of switching element modules 60-1-1, 60-1-2 (60-1-1, 60-1-2) included in the converters 50-1, 50-2, and 50- , 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2 and 60- The converter driving step S630 is a step of driving the plurality of switching element modules connected in parallel included in the converters 50-1, 50-2 and 50-n having the smallest cumulative driving time 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1,60- 60-1, 60-2-1, 60-2-2, 60-2-m, and 60-n-1 of any one of the switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-m, 60-2-m, 60-2-m and 60- 1, 60-2-2, 60-2-m, 60-n-1, 60-n-2, 60-nm.

In one embodiment, the cumulative driving time calculating step S610 includes switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60 2-m, 60-n-1, 60-n-2, and 60-nm start driving and stop driving, and the switching elements 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- Which is the time at which the driving is started and the driving is stopped, is summed with the driving time at which the driving time is stored. The cumulative driving time calculating step S610 is performed for one hour and fourteen minutes for the switching element module 60-1-1 and the switching element module 60-1 -2) for 1 hour and 30 minutes, ... And for the switching element module 60-1-m, the cumulative driving time that has been performed up to now for the m switching element modules 60-1-1, 60-1-2, 60-1-m is 50 minutes, And stores it.

The cumulative driving time calculating step S610 does not calculate only the driving time of the switching element modules 60-1-1, 60-1-2 and 60-1-m included in the converter 50-1, The switching element modules 60-1-1 and 60-1-2 included in each of the converters 50-1, 50-2 and 50-n are connected to the converters 50-1, 50-2 and 50- , 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2, 60-nm.

In one embodiment, the step of driving the converter (S630) includes a step of switching the plurality of switching element modules 60-1-1, 60-1-1, 60-2-1 and 60-2-1 in parallel included in the converters 50-1, 50-2 and 50- 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- The switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- 60-1-m, 60-2-1, and 60-2-m, which have the smallest cumulative driving time, when driving the switching element modules 60-1-1, 60-1-2, 60- 2, 60-2-m, 60-n-1, 60-n-2, and 60-nm. A plurality of switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1 and 60-n connected in parallel included in the converters 50-1, 50-2 and 50- (60-1-1, 60-1-2, 60-1) of any one of the switching element modules (60-1-1, 60-1-2, 60-2-m, 60-n- 60, 60-2, 60-2-m, 60-n-1, 60-n-2, 60-nm) And when the wind blows, the wind is blown more strongly. The fact that the converters 50-1, 50-2 and 50-n are driven means that the switching element modules 60-1-1 and 60-1-2 included in the converters 50-1, 50-2 and 50- 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- 60-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- . In a case where one of the converters 50-1, 50-2, and 50-n needs to be driven, the converter driving step S630 is a step in which the converters 50-1, 50-2, and 50- The switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n having the smallest cumulative driving time -1, 60-n-2, and 60-nm.

The plurality of switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- 60-1-1, 60-2-1, 60-2-1, 60-2-1, 60-2-2, and 60- 60-1, 60-1-m, 60-2, 60-1, 60-2, and 60-nm by driving the plurality of switching element modules 60-1-1, 60-1-2, 60-1- 60-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2 and 60-nm are equalized and accordingly, the specific switching element modules 60-1- 60-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- Can be prevented from being shortened.

In one embodiment, the converter driving step S630 includes the step of driving one or more switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2- 60-1-1, 60-1-2, 60-2-m, 60-n-1, 60-n-2, 60- 60-2-1, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2 and 60-nm, The modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- 60-nm. (60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- (60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-nm) among the switching element modules 60-1 to 60- 2-m, 60-n-1, 60-n-2, and 60-nm must be stopped when the wind blows but is not blown or when the wind blows weakly. In the case of the above case, the converter driving step (S630) may include the m switching element modules 60-1-1 and 60-1 calculated in the cumulative driving time calculating step S610 by taking the converter 50-1 as an example -2, and 60-1-m, the driving of the switching element modules 60-1-1, 60-1-2, and 60-1-m having the greatest driving time is stopped.

In one embodiment, the converter control method of a wind power generation system further includes a procedure for setting the driving sequence of the plurality of converters (50-1, 50-2, 50-n ) setting step (S620), the converter In the driving step S630, when any one of the converters 50-1, 50-2 and 50-n of the plurality of converters 50-1, 50-2 and 50-n is to be driven, The converters 50-1, 50-2 and 50-n of the next sequential order of the converters 50-1, 50-2 and 50-n, which have been driven last, -n).

In one embodiment, the order setting step S620 sets the driving order of the plurality of converters 50-1, 50-2, and 50-n. For example, the order setting step (S620) includes the steps of setting the order of the converter 50-1, the converter 50-2, ..., , And the converter 50-n in that order. The order setting step S620 sets the driving order of the converters 50-1, 50-2, and 50-n is not limited to the above example, and the odd-numbered converters 50-1, 50-3, ... are sequentially driven first, and then the even-numbered converters 50-2, 50-4, ... are sequentially driven in order of increasing number.

In one embodiment, the step S630 of driving the converter may be performed by driving one of the converters 50-1, 50-2, 50-n of the plurality of converters 50-1, 50-2, 50-n The converter 50-1, 50-2, and 50-n of the next sequential order of the last driven converters 50-1, 50-2, and 50-n based on the driving order of the set converters 50-1, 50-2, 1, 50-2, and 50-n. When one of the converters 50-1, 50-2, and 50-n of the plurality of converters 50-1, 50-2, and 50-n is to be driven, the wind is not blown but the wind suddenly blows And the case where the wind blows more strongly. The converter driving step S630 is performed in the order of the converters 50-1, 50-2, and 50-n that have been driven last, based on the driving order of the converters 50-1, 50-2, and 50-n set by the order setting step S620 50-1, 50-2, and 50-n of the next sequential number of the converters 50-1, 50-2, and 50-n.

In one embodiment, the order setting step S620 is to set a driving stop order of at least one of the converters 50-1, 50-2, and 50-n in operation , and the converter driving step S630 When stopping the driving of any one of the converters 50-1, 50-2 and 50-n of the one or more converters 50-1, 50-2 and 50-n being driven, 50-1, 50-2, and 50-n) of the converters 50-1, 50-2, and 50- 2, and 50-n.

In one embodiment, the order setting step S620 is configured to set the order of stopping the driving of one or more converters 50-1, 50-2, and 50-n in operation. For example, the order setting step (S620) includes the steps of setting the order of the converter 50-1, the converter 50-2, ..., , And converter 50-n in this order. The order setting step S620 sets the driving order of the converters 50-1, 50-2, and 50-n is not limited to the above example, and the odd-numbered converters 50-1, 50-3, ... are sequentially driven first, and then the even-numbered converters 50-2, 50-4, ... are sequentially driven in order of increasing number.

In one embodiment, the step of driving the converter S630 includes the steps of selecting one of the converters 50-1, 50-2, and 50-n among the one or more converters 50-1, 50-2, (50-1, 50-2, and 50-n) is stopped based on the order in which the converters 50-1, 50-2, and 50-n are stopped And stops driving the converters 50-1, 50-2, and 50-n of the next sequential number. If the driving of any one of the converters 50-1, 50-2, and 50-n of the one or more converters 50-1, 50-2, and 50-n in operation is to be stopped, And when the wind blows and the wind blows more weakly. The converter drive step S630 is performed based on the drive stop order of the converters 50-1, 50-2 and 50-n set by the order setting step S620, The driving of the converters 50-1, 50-2, and 50-n of the next sequential order of the converters 50-1, 50-2, and 50-n is stopped.

In one embodiment, the order setting step S620 includes a step of setting a plurality of switching element modules 60-1-1, 60-1-2, 60-n included in the converters 50-1, 50-2, -1-m, setting the driving sequence of 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2, 60-nm) , wherein the converter driving stage ( Step S630) is performed based on the driving order of the converters 50-1, 50-2, and 50-n, the converters 50-1, 50-2, and 50- 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2 (60-1-1, 60-2-1, 60-2-1, 60-1-2, 60-2-m, 60-n-1, 60-n-2 and 60- , 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2 and 60-nm are driven, the set switching element modules 60-1- 1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- 60-1, 60-1-m, 60-2-1, 60-2-2, 60-2-m, and 60- n-1, 60-n-2, 60-nm) The switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- -n-2, 60-nm).

In one embodiment, the order setting step S620 includes a step of setting a plurality of switching element modules 60-1-1, 60-1-2, 60-n included in the converters 50-1, 50-2, -1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2, and 60-nm. For example, in the case of the converter 50-1, the order setting step S620 includes switching element modules 60-1-1, ..., , And the switching element module 60-1-m. When the order setting step S620 determines that the switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- -1, 60-n-2, and 60-nm are not limited to the above-described examples, and the odd-numbered switching element modules 60-1-1 and 60-1- 3, ..., 60-2-1, 60-2-3, ..., 60-n-1, 60-n-3, ... are driven first and then the even- 1-2, 60-1-4, ..., 60-2-2, 60-2-4, ..., 60-n-2, 60-n-4,.

In one embodiment, the converter driving step S630 may include the last-driven converters 50-1, 50-2, 50-n based on the driving order of the set converters 50-1, 50-2, 50- 60-1, 60-1-m, 60-n) including the converters 50-1, 50-2, 50-n of the next sequential order of the switching elements 60-1-1, 60-1, 60-1, 60-2, 60-2, 60-2-2, 60-2-m, 60-n-1, 60- 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2 and 60- The switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, and 60-nm based on the driving sequence of the switching elements 60-1-1, 60-1-2, 60-1-m, 60-n-1, 60-n-2 and 60- 2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2, and 60-nm. The plurality of switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- (60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-n) m, 60-n-1, 60-n-2, and 60-nm must be driven when the wind is suddenly blowing and when the wind blows more strongly. The converter drive step S630 is performed by the switching element modules 60-1-1, 60-1-2, 60-1-m, and 60-2-m set by the order setting step S620, 60-1-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2 and 60- 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- The switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- 2, 60-nm). The last driven switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- 60-1, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- 60-1-2, 60-1-m, 60-2-m, 60-n-1, 60-n- 1, 60-2-2, 60-2-m, 60-n-1, 60-n-2, and 60-nm, or the switching element modules 60-1-1, 60-1-2, 60-1 60-n-1, 60-n-2, and 60-nm of the switching element modules 60-n, 60-2-1, 60-2-2, 60-2- 60-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- to be.

In one embodiment, the order setting step S620 may include at least one switching element module 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2 Wherein the step of driving the converter (S630) comprises the steps of: driving one or more of the driven one or more (S6, S6, S6, S6, The switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- 60-1, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-2-1, 60-2- 60-1, 60-1-m, 60-2, and 60-nm when the driving of the switching element modules 60-1-1 to 60- 60-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2 and 60-nm, -1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2, The switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- -n-2, 60-nm) .

In one embodiment, the order setting step S620 includes the step of setting one or more switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2- 2, 60-2-m, 60-n-1, 60-n-2, and 60-nm. For example, in the case of the converter 50-1, the order setting step S620 includes switching element modules 60-1-1, ..., , And the switching element module 60-1-m. The order setting step S620 is not limited to the above-described example, and the odd-numbered switching element modules 60-1-1, 60-1-3, ..., 60-2-1, 60-2-3, ..., 60-n-1, 60-n-3, ... are stopped first, and then the even-numbered switching element modules 60- 1-2, 60-1-4, ..., 60-2-2, 60-2-4, ..., 60-n-2, 60-n-4, ..., .

In one embodiment, the converter driving step S630 includes the step of driving one or more switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2- 60-1-1, 60-1-2, 60-2-m, 60-n-1, 60-n-2, 60- 60-2-1, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2 and 60-nm, the set switching module 60-1 -1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60-n-2, The switching device modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, and 60-2-m , 60-1-2, 60-1-m, 60-2-1, 60-n-1, 60-n-1, 60- -2-2, 60-2-m, 60-n-1, 60-n-2, and 60-nm. (60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- (60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-nm) among the switching element modules 60-1 to 60- 2-m, 60-n-1, 60-n-2, and 60-nm must be stopped when the wind blows but is not blown or when the wind blows weakly. The converter drive step S630 is performed by the switching element modules 60-1-1, 60-1-2, 60-1-m, and 60-2-m set by the order setting step S620, 60-1 to 60-n-1, 60-2-2, 60-2-m, 60-n-1, 60- 1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60-n-1, 60- The switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- n-2, and 60-nm.

FIG. 4 shows a configuration of a switching element module 200 according to an embodiment. The switching element modules 60-1-1, 60-1-2, 60-1-m, 60-2-1, 60-2-2, 60-2-m, 60- , 60-n-2, and 60-nm are the same as the detailed configuration of the switching element module 200 shown in FIG. The switching element module 200 includes six switching elements of the AC / DC converter 210 and six switching elements of the DC / AC inverter 230 and the DC link 220. The AC / DC converter 210 converts the AC output from the generator into a DC form. The DC / AC inverter 230 converts the converted direct-current power into an alternating-current form and transfers it to the system side. The configuration for converting AC power to DC power, and the configuration for converting DC power to AC power are obvious to those skilled in the art of converters.

Power supplied to the system is three-phase alternating-current power. In the case of one of the three phases, two of the six switching elements of the AC / DC converter 210 must be turned on in order for AC power to be transmitted to the system And two of the six switching elements of the DC / AC inverter 230 should be turned on. These features are apparent to those of ordinary skill in the art of converters.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation and that those skilled in the art will recognize that various modifications and equivalent arrangements may be made therein. It will be possible. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

10: Blade
30: Gearbox
40: generator
50-1, 50-2, ... , 50-n: converter
60-1-1, 60-1-2, ... , 60-1-m, 60-2-1, 60-2-2, ... , 60-2-m, 60-n-1, ... , 60-n-2, ... , 60-nm: switching element module
70: Transformer
100: Converter control device of wind power system
110:
120: Cumulative driving time calculating section
130: order setting unit

Claims (18)

In the case where any one of a plurality of converters connected in parallel between the generator and the system is to be driven,
A converter driving unit for driving a converter having the smallest cumulative driving time or for driving a converter of the next sequential number of the last driven converter based on a driving order of the set converter ;
And the converter control unit of the wind power generation system.
The converter control apparatus of the wind power generation system according to claim 1,
A cumulative driving time calculating unit for calculating cumulative driving time for accumulating driving time for each of the plurality of converters ; Further comprising:
When the converter driving unit is to drive any one of the plurality of converters,
And the converter having the smallest cumulative drive time is driven.
The method of claim 1, wherein the converter driving part,
When the driving of one of the at least one converter in operation is to be stopped,
And stops the driving of the converter having the largest cumulative driving time.
3. The apparatus according to claim 2, wherein the cumulative driving time calculating section
Wherein the cumulative driving time is calculated by accumulating the driving time for each of the plurality of switching element modules included in the converter,
The converter drive unit includes:
When a switching element module of any one of a plurality of switching element modules connected in parallel included in a converter having the smallest cumulative driving time is to be driven,
And drives the switching element module having the smallest cumulative driving time.
The method of claim 4, wherein the converter driving part,
When the driving of one of the one or more switching element modules in operation is to be stopped,
And stops the driving of the switching element module having the largest cumulative driving time.
The converter control apparatus of the wind power generation system according to claim 1,
A sequence setting unit for setting a driving sequence of a plurality of converters; Further comprising:
When the converter driving unit is to drive any one of the plurality of converters,
And drives the converter of the next sequential order of the last driven converter based on the driving order of the set converter.
The method of claim 6, wherein the sequence setting section is
Characterized in that a driving stop order of at least one converter in operation is set,
The converter drive unit includes:
When the driving of one of the at least one converter in operation is to be stopped,
And stops driving the converter of the next sequential number of the converter that was last driven off based on the drive stop order of the set converter.
The method of claim 6, wherein the sequence setting section is
A driving sequence of a plurality of switching element modules included in the converter is set,
The converter drive unit includes:
If it is necessary to drive any one of the plurality of switching element modules connected in parallel, which is included in the converter of the next sequential order of the last driven converter based on the driving order of the set converter,
And drives the switching element module of the next sequential order of the last driven switching element module based on the driving sequence of the set switching element module.
The method of claim 8, wherein the sequence setting section is
Characterized in that a drive stop order of at least one switching element module in operation is set,
The converter drive unit includes:
When the driving of one of the one or more switching element modules in operation is to be stopped,
And stopping the driving of the switching element module of the next sequential order of the switching element module which is finally stopped based on the driving stop order of the set switching element module.

In the case where any one of a plurality of converters connected in parallel between the generator and the system is to be driven,
A converter driving step of driving a converter having the smallest cumulative driving time or driving a converter of the next sequential number of the last driven converter based on a driving order of the set converter ;
Wherein the converter control method comprises the steps of:
The method of claim 10, wherein the converter control method of the wind power generation system comprises:
A cumulative driving time calculating step of calculating cumulative driving time in which driving time for each of the plurality of converters is accumulated ; Further comprising:
Wherein when the converter driving step is to drive any one of the plurality of converters,
And the converter having the smallest cumulative drive time is driven.
11. The method of claim 10, the converter driving step,
When the driving of one of the at least one converter in operation is to be stopped,
And stops the driving of the converter having the largest cumulative driving time.
12. The method of claim 11, wherein the calculating step is a cumulative driving time,
Wherein the cumulative driving time is calculated by accumulating the driving time for each of the plurality of switching element modules included in the converter,
The converter driving step includes:
When a switching element module of any one of a plurality of switching element modules connected in parallel included in a converter having the smallest cumulative driving time is to be driven,
And the switching element module having the smallest cumulative driving time is driven.
The method of claim 13 wherein the converter stage is driven,
When the driving of one of the one or more switching element modules in operation is to be stopped,
And stops the driving of the switching element module having the largest accumulated driving time.
The method of claim 10, wherein the converter control method of the wind power generation system comprises:
A sequence setting step of setting a driving sequence of a plurality of converters; Further comprising:
Wherein when the converter driving step is to drive any one of the plurality of converters,
Wherein the converter of the next sequential order of the last driven converter is driven based on the driving order of the set converter.
The method of claim 15, wherein the sequence setting step,
Characterized in that a driving stop order of at least one converter in operation is set,
The converter driving step includes:
When the driving of one of the at least one converter in operation is to be stopped,
And stops driving the converter of the next sequential number of the converter that was last driven off based on the drive stop order of the set converter.
The method of claim 15, wherein the sequence setting step,
A driving sequence of a plurality of switching element modules included in the converter is set,
The converter driving step includes:
If it is necessary to drive any one of the plurality of switching element modules connected in parallel, which is included in the converter of the next sequential order of the last driven converter based on the driving order of the set converter,
And drives the switching element module of the next sequential order of the last driven switching element module based on the driving sequence of the set switching element module.
18. The method of claim 17,
Characterized in that a drive stop order of at least one switching element module in operation is set,
The converter driving step includes:
When the driving of one of the one or more switching element modules in operation is to be stopped,
And stopping the driving of the switching element module of the next sequential number of the switching element module that was lastly driven off based on the driving stop order of the set switching element module.

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