KR101784944B1 - Composition method of over-voltage suppressing filter - Google Patents

Composition method of over-voltage suppressing filter Download PDF

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KR101784944B1
KR101784944B1 KR1020160023716A KR20160023716A KR101784944B1 KR 101784944 B1 KR101784944 B1 KR 101784944B1 KR 1020160023716 A KR1020160023716 A KR 1020160023716A KR 20160023716 A KR20160023716 A KR 20160023716A KR 101784944 B1 KR101784944 B1 KR 101784944B1
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overvoltage
reactor
suppression filter
topology
filter
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KR1020160023716A
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Korean (ko)
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KR20170101044A (en
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김원상
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삼성중공업 주식회사
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
    • H03H1/02—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network of RC networks, e.g. integrated networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0153—Electrical filters; Controlling thereof
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/38—Impedance-matching networks

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  • Emergency Protection Circuit Devices (AREA)

Abstract

The present invention relates to a method of constructing an overvoltage suppression filter that effectively suppresses the occurrence of an overvoltage by disposing a space in which an installation space is taken into consideration. The method of constructing the overvoltage suppression filter includes a method of constructing an overvoltage suppression filter including a reactor, a load, and a capacitor provided in a power cable connecting a plurality of power conversion apparatuses and a load to maintain a voltage applied to the load below a limit value (A) determining a topology of an overvoltage suppression filter in correspondence with a space between a plurality of power conversion apparatuses and a load, calculating a voltage rise time (t t ) of each of the plurality of power conversion apparatuses t r) for comparison with a transfer function of (B) determining a potential over-voltage generated, surge filter, the damping factor (ζ) and the natural frequency ((C) step, and the determined surge protector for calculating ω n) Using the reactors, resistors, and capacitor interrelationships and the calculated damping coefficients and natural frequencies corresponding to the topology of the filter, the capacities of the reactors, resistors, and capacitors, And a (D) step of setting group.

Description

[0001] The present invention relates to an overvoltage suppressing filter,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of constructing an overvoltage suppression filter, and more particularly, to a method of constructing an overvoltage suppression filter in which elements of a filter for suppressing overvoltage generation are disposed in consideration of an installation space.

The cables connect the load to a remote power converter and deliver power from the power converter to the load. A cable causes voltage reflection if its own characteristic impedance does not match the impedance of the load. Voltage reflection can increase the voltage applied to the load from the power inverter.

This phenomenon can be evident when the cable length is long. In one example, the reflected voltage is summed with the incident voltage of the power converter and applied to the load with an overvoltage. As a result, the overvoltage can be twice the rated voltage of the load.

These overvoltages exceed the dielectric strength of the load, and may cause a safety accident by insulating and destroying some or all of the load. Currently, researches and developments have been actively made on filters that suppress voltage reflection phenomenon by canceling the component characteristics of inductance, reactance and resistance of cables in order to prevent such accidents.

However, most of the developed filters have the feature of effectively suppressing the voltage reflection, but there is a problem in that it is not easy to arrange the elements appropriately in consideration of the installation space.

Korean Patent Publication No. 10-1999-0009548 (Oct. 16, 2000)

A problem to be solved by the present invention is to provide an overvoltage suppression filter which can prevent an accident such as breakage of a load due to overvoltage by disposing the filter in a form suitable for the space in which the filter is installed and a component having a proper capacity, .

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a method of constructing an overvoltage suppression filter including a reactor, a resistor, and a capacitor provided in a power cable connecting a plurality of power conversion devices and a load, In the overvoltage suppression filter,

(A) determining a topology of the overvoltage suppression filter in correspondence with a space between the plurality of power conversion devices and the load;

(B) comparing the voltage propagation time (t t ) of the power cable with the voltage rise time (t r ) of each of the plurality of power converters to determine the possibility of generating an overvoltage;

(C) calculating a damping coefficient (?) And a natural frequency (? N ) of the overvoltage suppressing filter using a transfer function of the overvoltage suppressing filter; And

And (D) setting the capacity of the reactor, the resistor and the capacitor using the reactor, resistance, and capacitor relationship corresponding to the determined topology of the overvoltage suppression filter, and the calculated damping coefficient and the natural frequency.

Wherein the topology of the overvoltage suppression filter includes a first topology in which the resistor and the capacitor are connected to a connection end for connecting reactors that pass currents of the same phase among the reactors connected to each of the plurality of power converter output stages, And a second topology in which the resistor and the capacitor are coupled to a reactor connected to each of the transformer output ends.

The overvoltage generated likelihood determination is the rising time (t r) This is determined based on whether or not more than three times the voltage wave propagation time (t t) of the voltage wave propagation time (t t) of the power cables of the power cable, Can be calculated as the product of the length and the voltage propagation velocity.

Wherein the damping coefficient is equal to or smaller than ln (0.2) / ( 2 + ln (0.2) 2 ), and the natural frequency (? N )

Figure 112016019371170-pat00001
Lt; / RTI >

The capacity of the reactor (L f) is a capacitor (C f of the damping factor (ζ) and the natural frequency (ω n) is calculated from a function of L f = R f / 2 * ζ * ω n ,, the capacitor ) is, the capacity and the natural frequency of the reactor can be calculated from a function of the C f = 1 / L f * ω n 2.

The size of the overvoltage suppression filter can be adjusted by adjusting the capacity of the reactor and the capacity in inverse proportion.

The method of constructing the overvoltage suppression filter according to the present invention can arrange the components in consideration of the condition of the space where the power conversion device is installed and appropriately adjust the size of the components to effectively suppress the occurrence of the overvoltage. As a result, it is possible to prevent an accident that the load is broken by the overvoltage by suppressing the occurrence of the overvoltage.

1 is a circuit diagram in which the overvoltage suppression filter of the present invention is installed.
Fig. 2 is a circuit diagram of the overvoltage suppression filter of Fig. 1 formed in the first topology and connected to the power conversion device; Fig.
3 is a circuit diagram of the overvoltage suppression filter of Fig. 1 formed in the second topology and connected to the power conversion device.
4 is a block diagram showing the overvoltage suppression filter of FIG. 1 as a transfer function.
5 is a diagram showing a single-phase voltage state in which the overvoltage is suppressed by the overvoltage suppression filter.
6 is a flowchart of a method of configuring the overvoltage suppression filter of FIG.

Brief Description of the Drawings The advantages and features of the present invention and methods of achieving them can be made clear with reference to the embodiments described below in detail with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. To fully disclose the scope of invention to a person skilled in the art, and the invention is only defined by the claims. Like reference numerals refer to like elements throughout the specification.

1 is a circuit diagram in which the overvoltage suppression filter of the present invention is installed. Hereinafter, a description will be given with reference to Fig. The overvoltage suppression filter 10 of the present invention includes the reactor L, the resistor R and the capacitor C as constituent elements so that the voltage increase rate dv / dt of the voltage input from the power conversion device 20 is And then applied to the load 30. In this case, the component can restrict the voltage applied to the load 30 to a limit value or less, and the first topology 10-1 or the second topology 10- 2).

The capacity of the disposed components is such that the voltage rise time t r of the power inverter 20 is three times or more than the voltage propagation time t t of the power cable 15 and the overvoltage is applied to the load 30 , It can be set to a value that can effectively suppress the overvoltage in accordance with the installed environment. The resistance value of the constituent elements of the overvoltage suppression filter 10 is calculated from the length and cross-sectional area of the power cable, the inherent characteristics of the conductor constituting the power cable, and the like. Then, the capacity of the reactor and the capacity of the capacitor are calculated from the unit step response through the transfer function and the damping coefficient (?) And the natural frequency (? N ) calculated through the Laplace inversion. In addition, the voltage propagation time t t of the power cable 15 can be calculated through the leakage inductance of the power cable, the coupling capacitance, and the length of the power cable.

Hereinafter, a method of constructing the overvoltage suppression filter according to an embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3. FIG.

Fig. 2 is a circuit diagram of the overvoltage suppression filter of Fig. 1 formed in a first topology and connected to the power conversion device, Fig. 3 is a connected circuit of the power conversion device, with the overvoltage suppression filter of Fig. 1 formed in the second topology .

The first topology 10-1 includes a resistor R and a resistor RN connected to the power cable 15 connecting the first reactor L1-1, the second reactor L2-1 and the Nth reactor LN- And an RC circuit composed of a capacitor C are arranged in parallel.

The first reactor L1-1, the second reactor L2-1 and the N-th reactor LN-1 are connected to the output terminals of the power converter 20, Of the current. The first reactors (L1-1) to the N-th reactor (LN-1) have the same inductance. And are connected in parallel. Looking at the reactor from the side of the RC circuit, the reactor capacity (L f ) is L f / N. Thus, the first topology 10-1 is the capacitance of the capacitor of the resonance voltage in association with a reactor (C f) to increase in inverse proportion to the capacity of the reactor (L f), the capacity of the resistance capacity of the reactor (L f ).

This results in a large loss of current in one resistor, which can reduce the size of the reactor and the capacitor in inverse proportion to the resistance value. Then, as the reactor L and the capacitor C are reduced in size, the overall size of the overvoltage suppression filter 10 becomes small.

The second topology 10-2 is a structure in which RC circuits each formed of a resistor R and a capacitor C are arranged in parallel in each reactor L connected to the output terminal of the power inverter 20. [ Therefore, the capacitances L f of the reactors viewed from the RC circuit of the second topology 10-2 are L f , respectively. Wherein the second topology (10-2) increases the capacity of each reduce the capacitance (C f) of the capacitor to be in inverse proportion to the capacity of the reactor (L f), the resistance to be proportional to the capacity of the reactor (L f).

As a result, the current in each resistor is lost little, and the size of the reactor L and the capacitor C becomes large in inverse proportion to the resistance value. The overall volume of the overvoltage suppression filter 10 increases as the size of the reactor L and the capacitor C increases.

Such second topology 10-2 can be applied to an environment condition in which the installation space S1 is wide and the number of resistors and capacitors is sufficient. On the other hand, the first topology 10-1 is relatively useful in an environment where the installation space S1 is relatively narrower than the second topology 10-2, and a large amount of heat can be discharged at a time, that is, Can be applied.

The first topology 10-1 and the second topology 10-2 are designed such that the total power lost in the resistor R of each topology is designed to be the same but the overpower suppression The capacity and the size of the constituent elements constituting the filter 10 are set to be adjusted differently. Hereinafter, with reference to FIG. 4, a method for setting the capacity of the overvoltage suppression filter 10 will be described in detail.

4 is a block diagram showing the overvoltage suppression filter of FIG. 1 as a transfer function.

The transfer function of the overvoltage suppression filter 10 is Laplace transformed in the manner as shown in FIG. 4,

Figure 112016019371170-pat00002
Lt; / RTI > The transfer function is a function of frequency and voltage variation
Figure 112016019371170-pat00003
And the second-order transfer function is transformed into a quadratic transfer function of
Figure 112016019371170-pat00004
And converted into a unit step response. The unit step response is inversely transformed by Laplace so that the characteristics of the voltage variation with time can be easily grasped,

Figure 112016019371170-pat00005
.

Here, the damping coefficient? Is less than or equal to ln (0.2) / (? 2 + (ln (0.2) 2 ) according to the National Electrical Manufactures Association (NEMA)

Figure 112016019371170-pat00006
Can be about 0.2 or less. Here, the natural frequency? N is set to a value such that the voltage rise time t r is less than three times the voltage propagation time t t of the power cable 15, and the damping coefficient is set to 0.456 Can be calculated. In addition, the calculated damping coefficient and the natural frequency are calculated from the function of L f = R f / 2 * ζ * ω n and the capacity (L f ) of the reactor, and the calculated capacity (L f ) n) and from the function of the C f = 1 / L f * ω n 2 is calculated from the capacity (C f) of the capacitor. The reactor capacity (L f ) and the capacitor capacity (C f ) are set in inverse proportion considering the designed filter volume and voltage resonance. The reactor and the capacitor are formed in a size suitable for the filter installation space S1, so that the overvoltage can be suppressed together with the resistance. For example, when the space in the filter installation space S1 is wide, the resistance value causing the damped vibration is fixed, and then the capacity of the reactor is adjusted so that the voltage resonance can be sufficiently suppressed, Adjust greatly. Then, the overvoltage suppression filter 10 suitable for the installation space is designed in consideration of the resistance loss and the size of the reactor by adjusting the capacity of the capacitor and the loss in each resistor to a small value. Conversely, when the space of the applied environment is narrow, the capacity of the reactor is made small, and the amount of loss in the resistance and the capacity of the capacitor are increased within a range in which the voltage resonance can sufficiently occur after fixing the resistance value .

Hereinafter, a state in which the overvoltage is suppressed by the overvoltage suppression filter 10 designed in this way will be described with reference to FIG.

However, the three-phase voltages output from the power conversion device 20 of the present specification may all be formed with overvoltages of the same magnitude, and for convenience of explanation, only one phase of the three-phase voltages will be described.

5 is a diagram showing a single-phase voltage state in which the overvoltage is suppressed by the overvoltage suppression filter 10;

As described above, the designed overvoltage suppression filter 10 is set in such a manner that the size of the reactor capacity L f and the capacity of the capacitor C f are inversely proportional to the space of the filter installation space S 1 , The overvoltage output from the power cable 15 can be suppressed. 5, the overvoltage suppression filter 10 suppresses the input voltage V1 of the spike voltage output through the power cable 15 by the reactor and the capacitor, and generates a smoothed square wave V2 I make it. The square wave V2 is applied to the load 30 along with the other rectangular wave V2 outputted from the power inverter 20 in a different phase.

Moreover, such a square wave V2 can be a power source that does not break or burn the load 30. [

Hereinafter, a method of configuring the overvoltage suppression filter of the present invention will be described with reference to FIG.

6 is a flowchart of a method of configuring the overvoltage suppression filter of FIG.

The method of configuring the overvoltage suppression filter starts with step (A) of determining the topology of the overvoltage suppression filter 10 corresponding to the filter installation space S1 secured between the plurality of power conversion apparatuses 20 and the load 30 do. Thereafter, the process proceeds to step (B) of comparing the voltage propagation time (t t ) of the power cable with the voltage rise time (t r ) of each of the plurality of power converters to determine whether an overvoltage exists. At this time, if the voltage applied to the load 30 is determined to be an overvoltage, a transfer function corresponding to the input / output ratio of the output voltage / power converter of the overvoltage suppression filter is calculated as a unit step response. Then, the process proceeds to a step (C) of calculating the damping coefficient (?) And the natural frequency (? N ) by converting the calculated unit step response into Laplace inverse transformation again. Then, the reactor corresponding to the determined topology of the overvoltage suppression filter and the damping coefficient (?) And the natural frequency (? N ) are substituted into the relational expression between capacitors to set the capacities of the reactor, the resistor and the capacitor do. At this time, the capacity of the reactor, the capacity of the capacitor, and the resistance value are adjusted in accordance with the environment of the filter installation space S1. When the capacity of the reactor, the capacity of the capacitor and the resistance value are determined, the overvoltage suppression filter 10 is designed by the determined reactor, the capacitor and the resistor to suppress the overvoltage inputted to the load 30, Do not break.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You can understand that you can. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

10: Overvoltage suppression filter 10-1: First topology
10-2: Second Topology 15: Power Cable
20: Power converter 30: Load
R: Resistor L: Reactor
C: Capacitor

Claims (6)

A method of configuring an overvoltage suppression filter including a reactor, a resistor, and a capacitor provided in a power cable connecting a plurality of power conversion apparatuses and a load to maintain a voltage applied to a load below a limit value,
(A) determining a topology of the overvoltage suppression filter in correspondence with a space between the plurality of power conversion devices and the load;
(B) comparing the voltage propagation time (t t ) of the power cable with the voltage rise time (t r ) of each of the plurality of power converters to determine the possibility of generating an overvoltage;
(C) calculating a damping coefficient (?) And a natural frequency (? N ) of the overvoltage suppressing filter using a transfer function of the overvoltage suppressing filter; And
And (D) setting the capacity of the reactor, the resistor and the capacitor using the reactor, resistance, and capacitor relationship corresponding to the determined topology of the overvoltage suppression filter, and the calculated damping coefficient and the natural frequency,
Wherein the damping coefficient is equal to or smaller than ln (0.2) / ( 2 + ln (0.2) 2 ), and the natural frequency? N is a calculation expression of a unit step response
Figure 112017027459481-pat00014
Of the overvoltage suppression filter. The overvoltage suppression filter according to claim 1, wherein the topology of the overvoltage suppression filter includes a plurality of reactors connected to each of the plurality of power converter output stages, a first end connected to the resistors and capacitors connected to the reactors, And a second topology in which the resistor and the capacitor are connected to a reactor connected to the topology and the plurality of power converter output stages, respectively. The method of claim 1, wherein the determination of the overvoltage generation is based on whether the voltage rise time (t r ) is at least three times the voltage propagation time (t t ) of the power cable, t ) is a product of the length of the power cable and the voltage propagation velocity. delete The method of claim 1, wherein the reactor capacity (L f ) is calculated from a function of the damping coefficient (ζ) and the natural frequency (ω n ) L f = R f / 2 * ζ * ω n , Wherein the capacity C f of the reactor is calculated from a function of the reactor capacity and natural frequency C f = 1 / L f * ω n 2 . 6. The overvoltage suppressing filter according to claim 5, wherein a size of the overvoltage suppressing filter is adjusted by adjusting the capacity of the reactor and the capacitance of the reactor in inverse proportion.
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