KR101178788B1 - Dump load system linking flywheel and control method using the same - Google Patents

Dump load system linking flywheel and control method using the same Download PDF

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Publication number
KR101178788B1
KR101178788B1 KR20100065703A KR20100065703A KR101178788B1 KR 101178788 B1 KR101178788 B1 KR 101178788B1 KR 20100065703 A KR20100065703 A KR 20100065703A KR 20100065703 A KR20100065703 A KR 20100065703A KR 101178788 B1 KR101178788 B1 KR 101178788B1
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South Korea
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dump
resistor
link
module
rod
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KR20100065703A
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Korean (ko)
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KR20120005119A (en
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남용윤
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한국기계연구원
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    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids

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Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dump load system, wherein a dump load system provided in a hybrid power generation system includes one end connected to a positive electrode of a DC link of a converter / inverter module and one end of a control switch for supplying and cutting off current to the dump rod. The dump load system can be implemented simply and economically by including a dump rod connected in series with the control switch and the other end connected to the ground of the DC link of the converter / inverter module.

Description

DUMP LOAD SYSTEM LINKING FLYWHEEL AND CONTROL METHOD USING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dump load system, wherein a dump load is connected to a DC link of a converter / inverter module of a flywheel through a control switch capable of ON / OFF control, and a reference voltage is set on the DC link to exceed the reference voltage. The present invention relates to a dump load system that can be controlled to be stored on a flywheel or consumed through a dump rod.

In general, wind power generation has a characteristic that the output varies widely and rapidly according to the wind speed condition, and thus, the wind power generator is operated in combination with a diesel generator driven by a diesel engine.

One example of such a wind-diesel hybrid power generation system is disclosed in FIG. 1.

Referring to the drawings, the wind-diesel hybrid power generation system 1 according to the related art is composed of a wind power generation system 10, a diesel power generation system 20, a flywheel unit 30, and a dump rod unit 40.

The wind generator 11 generates electric power by turning the windmill into the wind when the wind is blowing. At this time, the voltage and frequency of electricity generated by the wind intensity fluctuate. Therefore, it is made of electricity having a uniform voltage and frequency through the converter / inverter module 15 and supplied to the AC bus 50.

In addition, since the diesel generator 21 has low wind speed, only the electric power supplied by the wind generator 11 is operated when the power supply amount supplied to the customer 60 is insufficient, and uniform electricity production is possible, so that the AC bus does not go through the converter / inverter module. Power 50.

The flywheel 31 is an energy storage element capable of storing electrical energy and quickly extracting and storing the stored energy when needed. The flywheel 31 converts electrical energy into kinetic energy and stores the converted kinetic energy.

At this time, the flywheel 31, the electricity generated in accordance with the rotational speed may vary in frequency and voltage and must control the power stored in the flywheel 31 or generated in the flywheel 31, the converter / inverter module ( 35) is connected to the AC bus (50).

The dump rod 41 is an element that consumes idle power remaining after storing electrical energy in the flywheel 31. The dump rod 41 is composed of a plurality of resistors as shown in Figure 2 and emits power converted into direct current through the converter 45 in the form of thermal energy.

However, the conventional binary dump load as described above is expensive and complicated because it uses a plurality of load resistors (D) and operation switches (SW). Therefore, a dump load system that is simple in configuration and easy to control and economically consumes idle power is required.

The present invention has been made in view of the above-mentioned problems of the prior art, and provides a dump load system which is made of a simple configuration, which is easy to control and economical and effectively consumes idle power.

Dump dump system according to an aspect of the present invention, in the dump load system provided in a hybrid power generation system, one end is connected to the positive electrode of the DC link of the converter / inverter module, the control switch for supplying and blocking the current to the dump rod And a dump rod having one end connected in series to the control switch and the other end connected to the ground of the DC link of the converter / inverter module.

The dump rod system may include a switch failure detection unit having one end connected to a positive electrode of the DC link of the converter / inverter module and the other end connected between the control switch and the dump rod to detect a failure of the control switch. .

The dump load system may include a switch failure detection unit having one end connected to a positive electrode of a DC link of the converter / inverter module and the other end connected between the control switch and the dump rod.

The dump load system has a dump load module failure in which one end is connected to the positive electrode of the DC link of the converter / inverter module and the other end is connected to the ground of the DC link of the converter / inverter module to detect a failure of the dump load module. The detector may be provided.

The dump load system, the dump load module failure detection unit, a relay connected to the positive electrode of the DC link of the converter / inverter module, a resistor connected in series with the relay, one end is connected in series with the resistor The other end may be a power source connected to the ground of the DC link of the converter / inverter module.

The dump rod system has a first resistance and one end of which a contact is formed in the middle of the dump rod, one end of which is connected to the positive electrode of the DC link of the converter / inverter module and the other end of which is connected between the control switch and the dump rod. It may include a second resistor connected to the contact of the dump rod and the other end is connected to the ground of the DC link of the converter / inverter module.

The dump rod system may be formed by contacting the dump rod to form a tab in the middle of the dump rod.

The dump load system may set a resistance value of the first resistor such that when the voltage of the DC link is applied to the first resistor, the power dissipated from the first resistor becomes the set first power.

The dump rod system may set a resistance value of the second resistor such that most voltage drop occurs in the second resistor when current flows through the first resistor, the upper dump rod, and the second resistor.

In the dump load system, the first resistor and the second resistor may include a plurality of resistors.

The dump load system may include a measurement module that measures a control signal applied to the control switch, a voltage applied to the first resistor and the second resistor, and a determination module that determines whether an abnormality is detected by a signal measured by the measurement module. It may be provided with a dump rod abnormality detection unit comprising.

The dump load system may include a measurement module for measuring a control signal applied to the control switch and a voltage applied to the first and second resistors, and a mapping module for mapping a signal measured by the measurement module to a binary signal. And a dump rod abnormality detection unit including a determination module that determines whether an abnormality is detected by the signal measured by the mapping module.

According to an aspect of the present invention, there is provided a method of controlling a dump load system, the method comprising the steps of operating a flywheel converter / inverter module when surplus power is generated in an AC bus, and a DC link. Detecting whether the voltage exceeds the reference voltage and charging power until the reference voltage, and if the DC link voltage exceeds the reference voltage, storing energy in the flywheel until the number of revolutions of the flywheel becomes an allowable value. And consuming surplus power in the dump rod when the number of revolutions of the flywheel exceeds the allowable value.

According to the dump load system of the present invention, it is possible to make a simple configuration so that it is easy to control and economical, and can effectively consume idle power.

1 is a view showing the configuration of a typical wind-diesel hybrid power generation system.
2 is a view showing a dump rod used in a general hybrid power generation system.
3 is a view showing a dump load system according to an embodiment of the present invention.
4 is a diagram illustrating a configuration in which a failure detection unit is added to a dump load module of a dump load system according to an embodiment of the present invention.
5 is a view showing an example of the monitoring unit shown in Figure 4, Figure 5a is a switch failure detection unit, Figure 5b is a dump rod module failure detection unit.
6 is a view showing a configuration in which a failure detection device is added to the dump load system according to an embodiment of the present invention.
7 is a view showing an example of the dump rod abnormality detection unit shown in FIG.
FIG. 8 is a diagram illustrating a case where there is a plurality of sensing resistors shown in FIG. 6; FIG.
9 is a flowchart illustrating a method of controlling a dump load system according to an embodiment of the present invention.

The above-described features and effects of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, and thus, those skilled in the art to which the present invention pertains may easily implement the technical idea of the present invention. Could be. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosure, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Hereinafter, the contents described in the related art will be denoted by the same reference numerals and description thereof will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a view showing a dump load system according to an embodiment of the present invention.

Dump rod system 100 according to an embodiment of the present invention is made by the dump rod module 70 is connected to the DC link 355 of the converter / inverter module 35 is connected to the flywheel 31 and the dump rod Module 70 comprises a control switch (SW) and a dump rod (D). In addition, the control of the dump load system 100 is performed by the controller 33.

In this case, the converter / inverter module 35 includes a first switch module 351, a second switch module 353, and a DC link 355.

At this time, the first switch module 351 converts the alternating current flowing through the AC bus 50 into a DC link 355 or supplies the alternating current stored in the DC link 355 to AC to supply the AC bus 50. The second switch module 353 converts the direct current stored in the DC link 355 into an alternating current and supplies it to the flywheel 31 or converts the alternating current generated by the flywheel 31 into a direct current and supplies the DC link 355. The DC link 355 is a space in which direct current is stored.

One end of the control switch SW is connected to the positive electrode of the DC link 355 of the converter / inverter module 35 to supply and cut off current to the dump rod D.

In detail, one end of the control switch SW is connected to the positive electrode of the DC link 355 of the converter / inverter module 35 and the other end is connected to the dump rod D described later.

At this time, when the voltage of the DC link 355 is less than or equal to the set voltage, the control switch SW is opened. When the voltage of the DC link 355 exceeds the set voltage, the control switch SW is controlled according to the condition of the flywheel 31. Is closed to consume excess power in the dump load (D). The conditions of the flywheel 31 will be described later.

In this case, the control switch SW opens and closes according to a control signal transmitted from the controller 33 to supply current to the dump rod D.

At this time, the control of the control switch (SW) is preferably performed by the PWM (Pulse Width Modulation) control. Using PWM control, any desired voltage can be applied to the dump load (D) by adjusting the ON / OFF ratio of the control switch. Unlike the conventional dump load system of FIG. 2, only one dump load is required to maintain the DC link voltage. It may consume some power as needed.

One end of the dump rod D is connected to the control switch SW in series and the other end is connected to the ground of the DC link 355 of the converter / inverter module 35 to generate power exceeding a reference voltage. If it consumes it.

When the voltage of the DC link 355 exceeds the reference voltage and the control switch SW is operated by the controller 33, current flows from the DC link 355 plus the electrode via the dump rod D to the DC link 355. The excess power is dissipated as heat energy in the dump rod (D).

As described above, a single control switch SW and a dump rod D are configured, and the dump rod D consumes excess power whenever the voltage of the DC link 355 exceeds a reference voltage. As a result, the dump rod system 100 having high economical efficiency can be implemented with a simple configuration.

At this time, it is preferable that the dump load system 100 includes a switch failure detection unit 73 to detect whether a control switch SW is broken, and a dump load to detect whether the dump load module 70 is broken. It is preferable to provide the module failure detection unit 77.

4 is a diagram illustrating a case where a switch failure detector 73 and a dumpload module failure detector 77 are provided in the dump load system 100 according to an exemplary embodiment of the present invention.

One end of the switch failure detection unit 73 is connected to the positive electrode of the DC link 355 of the inverter and the other end is connected between the control switch SW and the dump rod (D). That is, the switch failure detection unit 73 is connected in parallel with the control switch (SW).

In detail, the switch failure detection unit 73 has one end connected to the positive electrode of the DC link 355 of the inverter and the other end of the control switch SW and the dump rod (as shown in FIG. 5A). D) consists of resistors Rs1 and Rs2 connected between them.

At this time, it is preferable to install the resistors Rs1 and Rs2 separately as shown, and to detect a voltage applied to the resistor Rs2 of a relatively small size to detect a failure.

With the above configuration, when the control switch SW is open, current flows to the resistors Rs1 and Rs2 and does not flow to the control switch SW. On the other hand, when the control switch SW is closed, a current flows to the control switch SW and a very small amount flows through the resistors Rs1 and Rs2. In the following description, it is expressed that the case where an extremely small amount of current flows is not approximated.

Accordingly, when the control switch SW operates normally, when the ON signal is transmitted to the control switch SW, the control switch SW is closed and the current flows to the control switch SW, and the current is applied to the resistors Rs1 and Rs2. Does not flow In addition, when the OFF signal is transmitted to the control switch SW, the control switch SW is opened and current flows to the resistors Rs1 and Rs2, and no current flows to the control switch SW.

That is, when the control switch SW is normally operated as described above, when the control signal transmitted to the control switch SW is ON, no current flows to the resistors Rs1 and Rs2, and the control signal transmitted to the control switch SW is When OFF, current flows through the resistors Rs1 and Rs2.

Therefore, the controller 33 compares the control signal transmitted to the control switch SW with the voltage signal detected at both ends of the small resistance resistor Rs2, and determines that the signals are normal if they are different from each other, and if they are the same, a failure is determined.

The dump rod module failure detection unit 77 has one end connected to the positive electrode 355a of the DC link 355 of the inverter and the other end connected to the ground 355b of the DC link 355 of the inverter. The failure of the dump load module 70 is detected before the load system operates.

In detail, the dump load module failure detection unit 77 may include a relay RL connected to the positive electrode 355a of the DC link 355 of the converter / inverter module 35 as shown in FIG. 5B. And a resistor Rd connected in series with the relay RL, and one end connected in series with the resistor Rd and the other end connected to the ground of the DC link 355 of the converter / inverter module 35. And a power source V connected to the 355b).

The relay RL receives a control signal from the controller 33 to operate the dump rod module failure detector 77. At this time, the control switch SW is turned ON using the controller 33.

When the dump load module failure detector 77 is operated, the controller 33 senses a voltage across the resistor Rd connected in series with the relay RL to determine whether the dump load module 70 has no abnormality. When the dump rod module 70 has an abnormality, a voltage extremely low is detected across the resistor Rd as compared with when the voltage is not detected or normal.

The power supply V supplies power to the dump rod module 70 before the dump rod system 100 is operated, that is, before the flywheel 31 and the dump rod D are connected to the AC bus 50. This means that the power supply V supplies power to the dump load module 70 while the converter / inverter module 35 is turned off.

Therefore, when the wind-diesel hybrid power generation system is operated, the relay RL of the dump rod module failure detection unit 77 is turned on and the current is driven by the power supply V through the resistor Rd and the control switch SW. As it flows into), a voltage is sensed at the resistor Rd, indicating that there is no problem with the system.

In the dump load system 100, the dump load module 70 is preferably provided with a failure detecting device for detecting a failure of the dump load during system operation.

Referring to FIG. 6, in the dump rod system 100, a contact point P is formed in the dump rod D and a first resistor R1 and a second resistor R2 are connected. Here, the contact point P formed in the dump rod D serves to separate the dump rod D into two resistors. The dump rod D is divided into an upper dump rod D1 and a lower dump rod D2 based on the contact point P.

With the above configuration, the control switch SW is controlled by three signals: a control signal transmitted to the control switch SW, a voltage signal applied to the first resistor R1, and a voltage signal applied to the second resistor R2. And failure of the dump rod D can be determined. A method of determining whether or not a failure will be described later.

The contact point P of the dump rod D is preferably formed by forming a tab T in the middle of the dump rod D. By forming the tab T as described above, the dump rod D made of one resistor can be easily separated into two resistors.

One end of the first resistor R1 is connected to the positive electrode 355a of the DC link 355 of the converter / inverter module 35, and the other end thereof is connected between the control switch SW and the dump rod D. do.

In this case, the resistance value of the first resistor R1 is preferably 10 times or more than the resistance value of the dump rod D. In more detail, the resistance value of the first resistor R1 is set to be very large compared to the resistance value of the dump rod D. Accordingly, when the control switch SW is opened and current flows to the first resistor R1 and the dump rod D, most of the voltage is applied to the first resistor R1.

In addition, the resistance value of the first resistor R1 is a resistance value such that the power dissipated from the first resistor R1 is as small as possible when most of the voltage of the DC link 355 is applied to the first resistor R1. Use

At this time, the value of power dissipated in the first resistor R1 may be arbitrarily set by the designer, and this value is set as the first power. The resistance value of the first resistor R1 is selected according to the set first power.

For example, when the DC link voltage is 1,000 V, when the first power dissipated by the first resistor R1 is limited to 10 W, the resistance value of the first resistor R1 may be set to 100 KΩ. In addition, it is possible to set the first resistor R1 by limiting the first power to 50W, 100W, or the like.

As the first resistor R1 is connected as described above, when the control switch SW is closed as in the switch failure detector described above, current flows to the control switch SW, and when the control switch SW is opened, the first resistor ( Current flows to R1).

One end of the second resistor R2 is connected to the contact point P of the dump rod D, and the other end thereof is connected to the ground 355b of the DC link 355 of the converter / inverter module 35.

In this case, the resistance of the second resistor R2 is preferably 10 times or more than the resistance of the first resistor R1. In more detail, the resistance value of the second resistor R2 is set to be very large compared to the resistance value of the first resistor R1.

This is because when the lower dump rod D2 is disconnected and current flows through the first resistor R1, the upper dump rod D1, and the second resistor R2, most of the voltage drop occurs at the second resistor R2. To do this. Therefore, it is possible for the designer to arbitrarily set the resistance value of the second resistor R2 within this range.

In addition, as the resistance value of the second resistor R2 is much larger than the resistance value of the first resistor R1, the resistance value of the second resistor R2 is also much larger than the resistance value of the lower dump rod D2. The combined resistance due to the addition of the resistor R2 approaches the resistance value of the lower dump rod D2.

As the second resistor R2 is connected as described above, most of the current flows through the lower dump rod D2 when the lower dump rod D2 is normal, and the second resistor R2 when the lower dump rod D2 is disconnected. Current flows through).

Next, a method of detecting a failure in the dump load module 70 provided with the above dump load failure detection apparatus will be described.

At this time, the resistance value of the second resistor R2 is set to be 10 times or more than the resistance value of the first resistor R1. In more detail, the resistance value of the second resistor R2 is set to be very large compared to the resistance value of the first resistor R1. This is for the purpose of facilitating the detection of a failure by causing most voltage drops to appear in the second resistor R2 when a voltage drop occurs through the first resistor R1 and the second resistor R2.

Accordingly, in the following, the relationship between the dump rod D, the first resistor R1, and the second resistor R2 is represented by the relationship between the dump rod D << first resistor R1 << second resistor R2. The description is based on the premise of satisfying.

In addition, a description will be given on the premise that the type of failure is a case of a control switch failure, an upper dump rod disconnection or a lower dump rod disconnection.

In addition, the voltage of the positive electrode 355a of the DC link 355 is referred to as Vdc and the resistance values of the upper dump rod D1 and the lower dump rod D2 will be described on the assumption that they are about the same.

Here, the control switch failure means a case where the control signal of the control switch SW is ON but the control switch SW is OFF or the control switch SW of the control switch SW is OFF but the control switch SW is ON. The upper dump rod disconnection refers to a case in which the upper dump rod D1 is disconnected due to breakage, and the lower dump rod disconnection refers to a case in which the lower dump rod D2 is disconnected due to damage.

As described above, a method of detecting a failure may be performed in a case where three signals, a control signal transmitted to the control switch SW, a voltage signal applied to the first resistor R1, and a voltage signal applied to the second resistor R2 are normal. The failure or failure of the switch or the dump rod D is determined by comparing the cases of failure.

In case of normal signals, if the control signal is OFF in the control switch SW, the control switch SW is actually turned off and the current is the first resistor R1, the upper dump rod D1, the lower dump rod D2, It flows to the second resistor R2.

In this case, since most voltage drops occur in the first resistor R1, a voltage of approximately Vdc is detected at the first resistor R1, and a voltage of approximately 0V is detected at the second resistor R2.

Therefore, the control signal of the control switch SW, the voltage signal applied to the first resistor R1, and the voltage signal applied to the second resistor R2 are represented as OFF, VdcV, and 0V, respectively.

In addition, when the control signal of the control switch SW is ON in the normal state, the control switch SW is actually turned on and the current is controlled by the control switch SW, the upper dump rod D1, the lower dump rod D2, and the second resistor ( R2).

In this case, the voltage applied to the first resistor R1 is 0V, and the voltage drop occurs equally at the upper dump rod D1 and the lower dump rod D2, and the second resistor R2 is equal to the lower dump rod D2. The voltage of the value is applied.

Therefore, the control signal of the control switch SW, the voltage signal applied to the first resistor R1, and the voltage signal applied to the second resistor R2 are shown as ON, 0V, and Vdc / 2V, respectively.

When the control switch SW is broken with respect to the normal signal, when the upper dump rod D1 is broken, and when the lower dump rod D2 is broken, a signal different from the normal signal is detected. Can be determined.

First, the case where the control switch SW has failed will be described.

In case of a failure in which the control switch SW is kept ON, even if the control signal of the control switch SW is OFF, the control switch SW is actually turned ON and the current is controlled by the control switch SW and the upper dump rod D1. , The lower dump rod D2 and the second resistor R2 flow.

In this case, the voltage applied to the first resistor R1 is 0V, and the voltage drop occurs equally at the upper dump rod D1 and the lower dump rod D2, and the second resistor R2 is equal to the lower dump rod D2. The voltage of the value is applied.

Therefore, the control signal of the control switch SW, the voltage signal applied to the first resistor R1, and the voltage signal applied to the second resistor R2 are represented as OFF, 0V, and Vdc / 2V, respectively. This is different from the signal at normal.

On the other hand, when a fault occurs in which the control switch SW is kept OFF, even if the control signal of the control switch SW is ON, the control switch SW is actually turned OFF and the current is the first resistor R1 and the upper dump rod ( D1), the lower dump rod D2, and the second resistor R2.

In this case, since most voltage drops occur in the first resistor R1, a voltage of approximately VdcV is detected at the first resistor R1, and a voltage of approximately 0V is detected at the second resistor R2.

Therefore, the control signal of the control switch SW, the voltage signal applied to the first resistor R1, and the voltage signal applied to the second resistor R2 are represented by ON, VdcV, and 0V, respectively. This is different from the signal at normal.

Accordingly, a failure of the control switch SW can be detected.

Next, a case where the upper dump rod D1 has failed will be described.

When the upper dump rod D1 fails, that is, when a disconnection occurs, the current cannot flow, so that the voltage across the first resistor R1 and the second resistor R2 becomes 0V.

Therefore, the control signal of the control switch SW, the voltage signal applied to the first resistor R1, and the voltage signal applied to the second resistor R2 are represented as OFF, 0V, 0V or ON, 0V, 0V, respectively. This is different from the signal when it is normal and when the control switch SW has failed.

However, in this case, the control switch SW and the upper dump rod D1 may fail together. This can be done by checking whether the control switch SW is broken when the upper dump rod D1 is broken. Do.

Accordingly, a failure of the upper dump rod D1 can be detected.

Next, a case where the lower dump rod D2 is broken will be described.

When the lower dump rod D2 breaks down, that is, when a disconnection occurs, current always flows to the second resistor R2. At this time, since the resistance value of the second resistor R2 is very large compared to the resistance value of the dump rod D or the first resistor R1, most of the voltage drop occurs at the second resistor R2 and thus the second resistor ( The voltage across R2) is all VdcV.

Therefore, the control signal of the control switch SW, the voltage signal applied to the first resistor R1, and the voltage signal applied to the second resistor R2 are represented as OFF, 0V, VdcV or ON, 0V, VdcV, respectively. This is different from the signal when it is normal, when the control switch SW is broken, and when the upper dump rod D1 is broken.

However, in this case, the control switch SW and the lower dump rod D2 may fail together. This can be done by checking whether the control switch SW is broken when the lower dump rod D2 is broken. Do.

Accordingly, a failure of the lower dump rod D2 can be detected.

The above process is performed in the measurement module 791 and the measurement module 791 measuring the control signal applied to the control switch SW and the voltage applied to the first resistor R1 and the second resistor R2. It is possible to perform using the dump load abnormality detection unit 79 including a determination module 795 that determines whether or not abnormality by the measured signal.

On the other hand, the control signal of the control switch SW, the voltage signal applied to the first resistor R1 and the voltage signal applied to the second resistor R2 are converted into binary signals through a mapping relationship, thereby causing a failure of the dump load module 70. You can also detect

For example, the control signal OFF of the control switch SW is 0, the control signal ON of the control switch SW is 1, 0 when the voltage applied to the first resistor R1 is 0 V, 1 when the voltage applied is VdcV, 0 when the voltage applied to the second resistor R2 is 0V, 1 when the voltage applied to the second resistor R2 is Vdc / 2V, and 1, the second resistor R2. If the applied voltage is VdcV, the mapping relationship can be set to zero.

By setting the above mapping relationship, failure of the upper dump rod D1 and the lower dump rod D2 may be integrated to detect whether the dump rod D has failed.

That is, OFF, 0V, 0V or ON, 0V, 0V, which are fault signals of the upper dump rod D1, can be mapped to 0, 0, 0, and 1, 0, 0, respectively. OFF, 0V, VdcV or ON, 0V, VdcV can be mapped to 0, 0, 0 and 1, 0, 0, respectively, so that if 0, 0, 0 and 1, 0, 0, the dump load (D) fails It can be determined that there is.

The above process is performed in the measurement module 791 'and the measurement module 791' which measure the control signal applied to the control switch SW and the voltage applied to the first resistor R1 and the second resistor R2. A dump load abnormality detection unit including a mapping module 793 'for mapping a measured signal to a binary signal and a determination module 795' for determining whether an abnormality is detected by the signal measured by the mapping module 793 '. It is possible to perform using 79 '.

Table 1 summarizes the normal signal, the abnormal signal and the mapping relationship of the dump load module 70 as described above.

In the above description, the first resistor R1 and the second resistor R2 are described as a single resistor. However, as illustrated in FIG. 8, the resistor R12 includes a plurality of resistors R11, R12, R21, and R22 and has a small resistance value. , R22) is preferably measured by converting the signal into a voltage suitable for the measuring instrument.

Normal signal, abnormal signal and mapping relationship of dump load module Dump Load Status Fault monitoring signal Binary mapping Status division
Dump load
resistance Switch control signal (actual switch state) Switch control signal
(ON / OFF) First resistance voltage
(V) Second resistance
Voltage
(V) Switch control
signal First resistance voltage Second resistance voltage N OFF (OFF) OFF Vdc 0 0 One 0 normal N ON (ON) ON 0 Vdc / 2 One 0 One normal N ON (OFF) ON Vdc 0 One One 0 Fault (switch) N OFF (ON) OFF 0 Vdc / 2 0 0 One Fault (switch) F1 OFF (OFF) OFF 0 0 0 0 0 Failure (upper dump load) F1 ON (ON) ON 0 0 One 0 0 " F1 ON (OFF) ON 0 0 One 0 0 " F1 OFF (ON) OFF 0 0 0 0 0 " F2 OFF (OFF) OFF 0 Vdc 0 0 0 Failure (lower dump load) F2 ON (ON) ON 0 Vdc One 0 0 " F2 ON (OFF) ON 0 Vdc One 0 0 " F2 OFF (ON) OFF 0 Vdc 0 0 0 " Reference <Binary mapping>
1.Switch control signal: OFF ⇒ 0, ON ⇒ 1
2. First resistance (R1) voltage: 0V ⇒ 0, Vdc ⇒ 1
3. The second resistor (R2) voltage: VdcV, 0V ⇒ 0, Vdc / 2 ⇒ 1
<Dump Load (D) Resistance State>
1.F1: Broken upper dump rod (D1)
2. F2: Lower dump rod (D2) damaged
<Relative size relative comparison>
Dump rod (D) << first resistor (R1) << second resistor (R2)

Next, a method of controlling the dump load system 100 according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

9 is a flowchart illustrating a method of controlling the dump load system 100 according to an embodiment of the present invention.

Referring to the drawing, first, when surplus power is generated in the AC bus 50, the first switch module of the converter / inverter module 35 of the flywheel 31 is operated (S901).

That is, when surplus power is generated in the AC bus 50, the controller 33 operates the first switch module 351 of the converter / inverter module 35 of the flywheel 31 to convert three-phase AC into DC to convert the converter / The DC link 355 of the inverter module 35 is charged.

Next, by detecting whether the voltage of the DC link 355 exceeds the reference voltage and charging the power until the reference voltage (S902).

That is, the current flowing into the DC link 355 of the converter / inverter module 35 is charged in the DC link 355 and the charging is performed until the voltage of the DC link 355 reaches the reference voltage.

Here, the reference voltage is a voltage which is a reference of the control, and is set in advance in the controller 33 in consideration of the efficiency and economical efficiency of the dump load system 100. When the controller 33 exceeds the reference voltage, the surplus power is stored through the flywheel 31 or the surplus power is consumed through the dump rod D so that the voltage of the DC link 355 is always the reference voltage. .

Next, when the voltage of the DC link 355 exceeds the reference voltage and the rotational speed of the flywheel 31 is less than the allowable value, energy is stored in the flywheel 31 (S903).

That is, when the voltage of the DC link 355 exceeds the reference voltage, the controller 33 detects this and checks whether or not energy is stored in the flywheel 31 (the rotation speed of the flywheel 31 is less than the allowable value). When the number of revolutions is lower than the allowable value, the second switch module 353 operates to store energy in the flywheel 31.

Accordingly, the voltage of the DC link 355 is lowered and the controller 33 stores energy in the flywheel 31 until the voltage of the DC link 355 becomes the reference voltage.

Next, when the number of revolutions of the flywheel 31 exceeds the allowable value, surplus power is consumed by the dump rod D (S604).

That is, when the voltage of the DC link 355 exceeds the reference voltage and the number of revolutions of the flywheel 31 exceeds the allowable value, and the energy cannot be stored in the flywheel 31, the control switch SW is operated to dump the excess power. Consumes through the rod (D).

Accordingly, the voltage of the DC link 355 is lowered, and the controller 33 consumes energy in the dump rod D until the voltage of the DC link 355 becomes the reference voltage. At this time, the second switch module 353 is in an OFF state which does not operate.

At this time, the control of the converter / inverter module 35 and the control switch SW of the flywheel 31 is automatically performed through a control program, and the dump load D switch is performed using PWM control.

On the other hand, when the power is insufficient in the AC bus 50, the first switch 351 is supplied to the AC bus 50 by changing the direct current of the DC link 355 to three-phase alternating current.

At this time, when the voltage of the DC link 355 becomes less than the reference voltage, the energy stored in the flywheel 31 is supplied to the DC link 355. That is, when the voltage of the DC link 355 is less than the reference voltage, the controller 33 generates three-phase exchange of energy stored in the flywheel 31 through the flywheel 31 driving motor and directs it to the second switch 353. In this way, the voltage of the DC link 355 is controlled to be the reference voltage.

In the detailed description of the present invention described above with reference to the preferred embodiments of the present invention, those skilled in the art or those skilled in the art having ordinary skill in the art will be described in the claims to be described later And it will be understood that various modifications and changes of the present invention can be made without departing from the scope of the art.

10: wind power generation system 20: diesel power generation system
30: flywheel part 31: flywheel
33 controller 35 converter / inverter module
50: AC bus 70: dump load module
351: first switch module 353: second switch module
355: DC link SW: control switch
D: dump load RL: relay
Rs1, Rs2, Rd: Resistor V: Power

Claims (13)

In the dump rod (D) system 100 provided in the hybrid power generation system,
A control switch (SW), one end of which is connected to the positive electrode 355a of the DC link 355 of the converter / inverter module 35 and supplies and cuts current to the dump rod D;
A dump rod (D) having one end connected in series to the control switch (SW) and the other end connected to the ground 355b of the DC link 355 of the converter / inverter module 35.
Dump Load System Including The method of claim 1,
One end is connected to the plus electrode 355a of the DC link 355 of the converter / inverter module 35 and the other end is connected between the control switch SW and the dump rod D to control the switch SW. A dump load system, comprising: a switch failure detection unit 73 for detecting a failure The method of claim 2,
The switch failure detection unit 73 has one end connected to a positive electrode 355a of the DC link 355 of the converter / inverter module 35 and the other end is connected between the control switch SW and the dump rod D. Dump rod system, characterized in that consisting of resistors (Rs1, Rs2) connected to The method of claim 1,
One end is connected to the positive electrode 355a of the DC link 355 of the converter / inverter module 35 and the other end is connected to the ground 355b of the DC link 355 of the converter / inverter module 35. A dump load system comprising a dump load module failure detector 77 for detecting a failure of the dump load module 70. The method of claim 4, wherein
The dump rod module fault detector 77 includes a relay RL connected to the positive electrode 355a of the DC link 355 of the converter / inverter module 35 and a resistor connected in series with the relay RL. (Rd) and one end is connected in series with the resistor (Rd) and the other end is composed of a power supply (V) connected to the ground (355b) of the DC link 355 of the converter / inverter module 35 Dump loading system The method of claim 1,
The dump rod (D) is a contact (P) is formed on the way,
A first resistor R1 having one end connected to the positive electrode 355a of the DC link of the converter / inverter module 35 and the other end connected between the control switch SW and the dump rod D;
A second resistor R2 having one end connected to the contact point P of the dump rod D and the other end connected to the ground 355b of the DC link of the converter / inverter module 35.
Dump Load System Including The method of claim 6,
The contact point P of the dump rod D is formed by forming a tab T in the middle of the dump rod D. The method of claim 6,
When the voltage of the DC link 355 is applied to the first resistor R1, the resistance value of the first resistor R1 is set such that the power dissipated by the first resistor R1 becomes the set first power. Dump loading system delete The method of claim 6,
Dump rod system, characterized in that the first resistor (R1) and the second resistor (R2) is made of a plurality of resistors The method of claim 6,
A measurement module 791 for measuring a control signal applied to the control switch SW and a voltage applied to the first resistor R1 and the second resistor R2;
Determination module 795 for determining whether an abnormality is detected by the signal measured by the measuring module 791.
Dump rod system characterized in that it comprises a dump rod abnormality detection unit 79 comprising a The method of claim 6,
A measurement module (791 ') measuring a control signal applied to the control switch and a voltage applied to the first resistor (R1) and the second resistor (R2);
A mapping module 793 'for mapping the signal measured by the measurement module 791' to a binary signal;
Determination module 795 ′ for determining whether an error occurs based on the signal measured by the mapping module 793 ′.
Dump rod system characterized in that it comprises a dump rod abnormality detection unit 79 comprising a A method for controlling the dump load system according to any one of claims 1 to 8 or 10 to 12,
Operating the converter / inverter module 35 of the flywheel 31 when surplus power is generated in the AC bus 50;
Sensing whether the voltage of the DC link 355 exceeds the reference voltage and charging power until the reference voltage becomes a reference voltage;
If the voltage of the DC link 355 exceeds the reference voltage, storing energy in the flywheel 31 until the rotational speed of the flywheel 31 becomes an allowable value;
Consumption of surplus power in the dump rod D when the number of revolutions of the flywheel 31 exceeds the allowable value
Control method of the dump load system comprising a
KR20100065703A 2010-07-08 2010-07-08 Dump load system linking flywheel and control method using the same KR101178788B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100519861B1 (en) * 2000-09-07 2005-10-11 알로이즈 우벤 Island network and method for operating of an island network

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100519861B1 (en) * 2000-09-07 2005-10-11 알로이즈 우벤 Island network and method for operating of an island network

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