KR101115457B1 - Power system stabilizier and method for stabilizing power system - Google Patents

Abstract

PURPOSE: A power system stabilizer and a method for stabilizing a power system are provided to improve the stabilization of an electric power system by suppressing the wide band mode and region mode of low frequency oscillation. CONSTITUTION: A signal filter unit(120) divides a broad band frequency and a local frequency. A first stabilization control unit(140) generates a first output signal through the broad band frequency signal and the broad band time constant. A second stabilization control unit(160) outputs a second output signal through the local frequency band and local time constant. A signal process unit(180) generates a tapping voltage signal using the first and second output signals. A broad band phase compensation unit compensates a phase delay and generates a first compensation signal. A broad band gain compensator generates a first output signal through a first compensation signal and the broad band gain time constant.

Description

Power system stabilization device and method {POWER SYSTEM STABILIZIER AND METHOD FOR STABILIZING POWER SYSTEM}

The present invention relates to a power system stabilization device, and more particularly, the present invention relates to a power system stabilization device and method for controlling the frequency of the wide-area mode and the local mode.

The AC power system vibrates at a frequency of 60 Hz in a normal state, but unwanted vibrations other than 60 Hz are generated due to changes in system facilities or system conditions. At this time, the system conditions may include a change in load, an accident and adjustment of various control systems. In particular, generators in the power system attempt to move the system to a new operating point in response to these system changes, becoming the main driving force for vibration (low frequency vibration).

Most low frequency vibrations disappear without any particular problems, but if the vibrations are kept constant or amplified, they will seriously affect the stability of the power system, especially the generator tripping. The low frequency oscillation frequency range of the power system generally occurs at 0.1 to 2 Hz, and the relatively low frequency band of 0.1 to 0.8 Hz is called inter-area mode, and 0.8 to 2 Hz is called local mode. Here, the interregional mode is also referred to as a wide-area mode, hereinafter referred to as a wide-area mode.

Low frequency vibration can be quickly suppressed by improving the damping force of the power system. The most economical and effective device is the Power System Stabilizer (PSS), the generator's auxiliary device. In this case, the damping force is also referred to as damping torque.

The power system stabilization device provides a damping force proportional to the generator speed to quickly suppress low frequency vibrations. In general, low frequency oscillations in the power system are a mixture of frequencies in the wide mode and local mode. However, the conventional power system stabilization device cannot provide damping torque to the generator in all frequency ranges of 0.1 to 2 Hz, and suppresses low frequency vibration around a specific frequency range, thereby preventing all low frequency vibrations from occurring.

In addition, the recent power system is expected to form microgrids consisting of renewable energy sources and nearby loads and smart grids based on them. Accordingly, when microgrids and smart grids are linked with existing systems, the possibility of vibration in a wide-area mode is expected to increase. Therefore, the necessity of controlling all frequencies of low frequency vibration in a power system stabilization device is increasing.

The present invention provides a power system stabilization apparatus and method that can suppress low-frequency vibration generated in the power system.

The present invention also provides a power system stabilization apparatus and method capable of providing a damping force of low frequency vibration to a power system.

According to one aspect of the invention, there is provided a power system stabilization device for connecting with the power system.

According to one embodiment of the present invention, a power system stabilization apparatus connected to a power system, the apparatus comprising: a signal filter for separating a wide frequency signal and a local frequency signal from a vibration frequency signal received from the power system; A first stabilization controller configured to set a wide center signal for the wide frequency signal, generate a wide time constant using the wide center signal, and generate a first output signal using the wide frequency signal and the wide time constant ; A second stabilization controller configured to set a local center signal for the local frequency signal, generate a local time constant using the local center signal, and generate a second output signal using the local frequency signal and the local time constant; ; And a signal processor configured to generate a damping voltage signal using the first output signal and the second output signal.

In this case, the first stabilization controller generates the wide time constant using the wide center signal, and compensates the phase delay of the wide frequency signal using the wide time constant to generate a first compensation signal. It includes a compensation unit.

The first stabilization controller may further include a global gain compensator configured to generate the first output signal by using the first compensation signal and a global gain constant.

Meanwhile, the second stabilization controller generates the local time constant using the local center signal, and compensates the phase delay of the local frequency signal using the local time constant to generate a second compensation signal. It includes a compensation unit.

The second stabilization controller may further include a local gain compensator configured to generate the second output signal by using the second compensation signal and a local gain integer.

In addition, each of the first and second stabilization controllers further includes a frequency blocking unit for preventing input of a normal output frequency signal received from the power system.

Here, the frequency blocking unit sets a blocking time constant for blocking the output frequency signal, and prevents the input of the output frequency signal by using the blocking time constant.

The signal processor may include a generator configured to generate the operation signal by calculating the first output signal and the second output signal; And an output limiting unit configured to generate the damping voltage signal by limiting the operation signal to voltage range information according to the power system.

The power system stabilizing apparatus compares the vibration frequency signal with another vibration frequency signal received from another power system connected to the power system, and generates a comparison value, and generates notification information when the comparison value is equal to or greater than a reference value. It further comprises an output management unit.

The power system stabilizing apparatus further includes an output unit configured to output the notification information.

In addition, according to another aspect of the present invention, there is provided a method for stabilizing a power system by a power system stabilizing device connected to the power system.

According to an embodiment of the present invention, in a method for stabilizing a power system by a power system stabilization apparatus connected to a power system, (a) separating a wide frequency signal and a local frequency signal from a vibration frequency signal received from the power system; step; (b) generating a wide time constant using a wide center signal for the wide frequency signal, and generating a first output signal using the wide frequency and the wide time constant; (c) generating a local time constant using a local center signal with respect to the local frequency signal, and generating a second output signal using the local frequency signal and the local time constant; And (d) generating a damping voltage signal using the first output signal and the second output signal.

And the step (b) comprises: setting the wide center signal for the wide frequency signal; Generating a wide time constant using the wide center signal; And compensating for the phase delay of the wide frequency signal using the wide time constant to generate the first output signal.

The generating of the first output signal by compensating for the phase delay of the wide frequency signal using the wide time constant may include compensating for the phase delay of the wide frequency using the wide time constant to compensate for the first compensation. Generating a signal; And generating the first output signal using the first compensation signal and a global gain integer.

On the other hand, step (c), the step of setting the local center signal for the local frequency signal; Generating a local time constant using the local center signal; And generating the first output signal by compensating for the phase region of the region frequency using the region time constant.

In this case, the generating of the first output signal by compensating the phase area of the local frequency using the local time constant may include compensating the phase delay of the wide frequency using the local time constant to compensate for the second compensation signal. Generating a; And generating the first output signal using the first compensation signal and a global gain integer.

In addition, the step (d), the operation of generating the operation signal by adding the first output signal and the first output signal; And limiting the operation signal to voltage range information according to the power system to generate the damping voltage signal.

On the other hand, the power system stabilization method, after the step (a), the step of receiving another vibration frequency signal from another power system connected to the power system; Generating notification information by comparing the vibration frequency signal with the other vibration frequency signal; And outputting the notification information.

Power system stabilization apparatus and method according to an embodiment of the present invention can suppress the wide-area mode and local mode of low frequency vibration occurring in the power system.

In addition, the power system stabilization apparatus and method according to an embodiment of the present invention can provide a damping force corresponding to the low frequency vibration to the power system.

And, the power system stabilization apparatus and method according to an embodiment of the present invention can improve the stabilization of the power system and can maximize the power transmission of the associated system.

1 is a block diagram showing a power system stabilization apparatus, an automatic voltage regulator and a generator according to an embodiment of the present invention.
2 is a block diagram showing a power system stabilization apparatus according to an embodiment of the present invention.
3 is a block diagram illustrating a stabilization control unit of a power system stabilization apparatus according to an embodiment of the present invention.
4 is a flowchart illustrating a power system stabilization method according to an embodiment of the present invention.
5 is a circuit diagram showing a power system stabilization apparatus according to an embodiment of the present invention.
6 is a graph illustrating a vibration frequency signal according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Hereinafter, embodiments of the power system stabilization apparatus and method according to the present invention will be described in detail with reference to the accompanying drawings, in the following description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals and Duplicate explanations will be omitted.

Power system stabilization apparatus according to an embodiment of the present invention will be described with reference to FIGS.

1 is a block diagram showing a power system stabilization apparatus, an automatic voltage regulator and a generator according to an embodiment of the present invention.

Referring to FIG. 1, a power system stabilizer (PSS) 100 is connected to an automatic voltage regulator AVR 350 and a power generator 370.

The power system stabilization apparatus 100 receives a vibration frequency signal from the generator 370. The power system stabilization apparatus 100 separates a wide frequency signal and a local frequency signal from the vibration frequency signal in order to suppress low frequency vibration in all regions generated by the generator 370. In this case, the wide frequency signal represents the low frequency vibration in the wide mode, and the local frequency signal represents the low frequency vibration in the local mode. The power system stabilization apparatus 100 generates a first output signal and a second output signal to suppress frequencies of each of the wide frequency signal and the local frequency signal. The power system stabilization apparatus 100 generates a damping voltage signal using the first output signal and the second output signal. The power system stabilization apparatus 100 is connected to the automatic voltage regulator 350 to transmit a damping voltage signal to the automatic voltage regulator 350. Such a power system stabilization apparatus 100 will be described in detail with reference to FIGS. 2 and 3.

The automatic voltage regulator 350 generates an induced voltage in the stator winding of the generator 370 by adjusting the field current and the field voltage so as to keep the terminal voltage of the generator 370 constant. The automatic voltage regulator 350 is connected to the power system stabilization apparatus 100 and the generator 370. That is, the automatic voltage regulator 350 receives a control signal including a damping voltage signal and a reference voltage signal received from the power system stabilization apparatus 100. In this case, the reference voltage signal represents a voltage which is a reference when the automatic voltage regulator 350 is operated to maintain the voltage of the generator 370 constant.

 The automatic voltage regulator 350 maintains the voltage of the generator 370 by adjusting the field current and the field voltage of the generator 370 using the reference voltage signal. In addition, the automatic voltage regulator 350 suppresses the output vibration of the generator 370 by using the damping voltage signal. The automatic voltage regulator 350 transmits a damping voltage signal to the generator 370.

The generator 370 converts thermal energy and the like into electrical energy, at which time a normal output frequency signal is generated. The normal output frequency signal is a frequency generated when the generator 370 operates in the normal state. However, the generator 370 generates vibration frequency signals other than the normal output frequency signals due to state changes, system conditions, and the like. At this time, the vibration frequency signal represents low frequency vibration that appears when a problem occurs in the generator 370. For example, the vibration frequency signal may be a rotor deviation of the generator 370.

The generator 370 is connected to the power system stabilization apparatus 100 and transmits a vibration frequency signal to the power system stabilization apparatus 100. The generator 370 receives the damping voltage signal from the automatic voltage regulator 350 to suppress the vibration frequency signal that is the low frequency vibration.

2 is a block diagram showing a power system stabilization apparatus according to an embodiment of the present invention.

2, the power system stabilization apparatus 100 includes a receiver 110, a signal filter 120, a stabilization controller 130, a signal processor 180, a transmitter 210, an output manager 230, and the like. The output unit 240 is included.

The receiver 110 is connected to the generator 370. The receiver 110 receives the vibration frequency signal and the output signal of the generator 370 from the generator 370. The receiver 110 provides the vibration frequency signal to the signal filter 120. In addition, the receiver 110 receives another vibration frequency signal from another generator (not shown) connected to the generator 370. The receiver 110 provides the output signal of the generator 370 and the other vibration frequency signal to the output manager 230.

Although the example includes the receiver 110, the present invention is not limited thereto, and the signal filter 120 may receive the vibration frequency signal and the output signal of the generator 370.

The signal filter unit 120 separates the vibration frequency signal from the wide frequency signal and the local frequency signal. That is, the signal filter unit 120 separates the vibration frequency signal, which is the low frequency vibration of all bands, into a local frequency signal representing the vibration of the wide mode and a local frequency signal representing the vibration of the local mode. The reason for separating the wide frequency signal and the local frequency signal from the vibration frequency signal is to suppress the low frequency vibration of all bands. The signal filter unit 120 provides the wide frequency signal to the first stabilization controller 140 and the local frequency signal to the second stabilization controller 160.

The stabilization control unit 130 includes a first stabilization control unit 140 for controlling a wide frequency signal and a second stabilization control unit 160 for controlling a local frequency signal.

The first stabilization controller 140 receives a wide frequency signal from the signal filter unit 120. The first stabilization controller 140 generates a wide time constant according to the wide frequency signal. In this case, the wide time constant is a time constant set to compensate for the phase delay of the wide frequency signal. The first stabilization controller 140 generates a first output signal by compensating for the phase delay of the wide frequency signal using the wide time constant. The first stabilization controller 140 provides the generated first output signal to the signal processor 180.

The second stabilization control unit 160 is connected to the signal filter unit 120 and receives a local frequency signal from the signal filter unit 120. The second stabilization control unit 160 generates a local time constant according to the local frequency signal. Here, the local time constant is a time constant set to compensate for the phase delay of the local frequency signal. The second stabilization control unit 160 generates a second output signal by compensating for the phase delay of the local frequency signal using the local time constant. The second stabilization controller 160 provides the second output signal to the signal processor 180.

The stabilization control unit 130 including the first stabilization control unit 140 and the second stabilization control unit 160 will be described with reference to FIG. 3.

The signal processor 180 generates a damping voltage signal using the first output signal and the second output signal. To this end, the signal processor 180 includes a generator 190 and an output limiter 195.

The generation unit 190 receives a first output signal from the first stabilization control unit 140 and a second output signal from the second stabilization control unit 160. The generator 190 generates an operation signal using the first output signal and the second output signal.

The output limiter 195 generates a damping voltage signal using the operation signal. In other words, the output limiter 195 generates a damping voltage signal by limiting the operation signal to the voltage range information of the automatic voltage regulator 350. In this case, the voltage range information may indicate a predetermined range of voltages that the automatic voltage regulator 350 can operate. The voltage range information may include maximum voltage information and minimum voltage information.

The transmitter 210 is connected to the automatic voltage regulator 350. The transmitter 210 transmits the damping voltage signal generated by the signal processor 180 to the automatic voltage regulator 350. At this time, the automatic voltage regulator 350 transmits a damping voltage signal to the generator 370 to suppress low frequency vibration generated from the generator 370.

Although the example includes the transmitter 210, the present invention is not limited thereto, and the damper voltage signal may be directly transmitted from the signal processor 180 to the automatic voltage regulator 350.

The output manager 230 receives the output signal of the generator 370 and the other vibration frequency signal from the receiver 110. The output manager 230 generates frequency information by using the output signal of the generator 370. That is, the output manager 230 performs Fourier transform on the output signal to generate frequency information. In this case, the frequency information may indicate the magnitude of the frequency generated by the generator 370. The output manager 230 controls the display unit 250 to output frequency information from the display unit 250, and provides notification information to the display unit 250.

In addition, the output manager 230 generates notification information using the vibration frequency signal and the other vibration frequency signal. Specifically, the output manager 230 generates a comparison value by comparing the phases of the vibration frequency signals and the other vibration frequency signals, respectively. The output manager 230 generates notification information when the comparison value is greater than or equal to the reference value. In this case, the reference value represents a criterion for determining that low frequency vibration has occurred in another region. For example, the reference value is 180 degrees.

The reason for generating the notification information is to inform the user that low frequency vibration is generated from the generator 370 of another power system connected to the generator 370 without generating low frequency vibration in the generator 370.

The output manager 230 provides the notification information to the display unit 250 and the light emitting unit 260 of the output unit 240. The notification information output through the display unit 250 may include at least one of a vibration frequency signal, another vibration frequency signal, a comparison value, and a reference value. The notification information output through the light emitter 260 may include an electrical signal for turning on the light emitter 260.

If the comparison value is less than or equal to the reference value, the output manager 230 does not generate notification information because low frequency vibration has occurred in the generator 370.

The output unit 240 outputs the notification information. The output unit 240 includes a display unit 250 and a light emitting unit 260.

The display unit 250 displays the notification information and the frequency information under the control of the output manager 230. That is, the display unit 250 displays notification information to inform the user that the low frequency vibration generated in the other generator is not the low frequency vibration generated in the generator 370 connected to the power system stabilization apparatus 100. The display unit 250 displays frequency information indicating the magnitude of the low frequency vibration generated by the generator 370.

In addition, the display unit 250 displays a process and result data performed by the components of the power system stabilization apparatus 100. For example, the display unit 250 may display the vibration frequency signal and the other vibration frequency signal received by the receiver 110. The display unit 250 may display the wide frequency signal and the local frequency signal separated by the signal filter 120. The display unit 250 may display a process of generating a first output signal and a second output signal from each of the first stabilization control unit 140 and the second stabilization control unit 160, and the generated first output signal and the second output signal. Can be. The display unit 250 may display a process of generating the operation signal and the damping voltage signal in the signal processor 180 and the generated operation signal and the damping voltage signal.

Meanwhile, the display unit 250 has errors in the receiver 110, the signal filter 120, the stabilization controller 130, the signal processor 180, the transmitter 210, the output manager 230, and the output 240. If the error occurs, you can indicate the error occurred.

The light emitter 260 outputs notification information under the control of the output manager 230. The light emitting unit 260 may display whether low frequency vibration is generated from another generator which is another power system connected to the generator 370. That is, the light emitting unit 260 emits light to output the notification information when receiving the notification information from the output manager 230.

Although the display unit 250 and the light emitter 260 are included in the description, for example, the present invention is not limited thereto and may include at least one of the display unit 250 and the light emitter 260. In addition, the output unit 240 has been described with an example including the display unit 250 and the light emitting unit 260, but is not limited thereto, and the type may be used as long as it can output the notification information. For example, the output unit 240 may be any one of a printer and a speaker unit.

3 is a block diagram illustrating a stabilization control unit of a power system stabilization apparatus according to an embodiment of the present invention.

Referring to FIG. 3, the stabilization control unit 130 includes a first stabilization control unit 140 and a second stabilization control unit 160. In this case, the first stabilization control unit 140 and the second stabilization control unit 160 may be connected in parallel.

The first stabilization controller 140 includes a first frequency cutoff unit 153, a wideband phase compensation unit 155, and a wide area gain compensation unit 157.

The first frequency blocker 153 cuts off the input of the normal output frequency signal from the generator 370. In this case, the normal output frequency signal may be a frequency output from the generator 370 in the normal state. In detail, the first frequency blocker 153 sets a blocking time constant. In this case, the blocking time constant is a time constant set to block a wide frequency signal. The blocking time constant may be set by receiving an input from a user or by using a preset algorithm. The first frequency blocker 153 prevents the input of the normal output frequency signal by using the cutoff time constant.

The reason for forming the first frequency cutoff unit 153 in the first stabilization control unit 140 is to cut off the normal output frequency signal to the inside of the first stabilization control unit 140 and to adjust the vibration frequency of the wide frequency signal. To generate a signal to suppress.

If the first frequency blocker 153 receives the wide frequency signal from the signal filter 120, the first frequency blocker 153 passes the wide frequency signal to the wide phase phase compensator 155. In this case, the signal filter unit 120 may be a band pass filter.

The first frequency cutoff unit 153 may receive a normal output frequency signal and a wide frequency signal together from the signal filter unit 120, or may receive only a normal output frequency signal or a wide frequency signal, respectively.

The global phase compensator 155 generates a first compensation signal using the wide frequency signal. Specifically, the wide area phase compensator 155 sets a wide center signal for the wide frequency signal. In this case, the wide center signal represents a signal centered on the wide frequency signal, and may indicate a frequency band shorted by the generator 370. The wide center signal may be set by the analysis result of the generator 370 or received from a user. The wide area phase compensator 155 generates a wide time constant using the wide center signal. In this case, the wide time constant includes the first to fourth wide time constants. A method of generating the first to fourth wide time constants will be described with reference to FIGS. 4 and 5.

The wide area phase compensator 155 generates a first compensation signal by compensating for the phase delay of the wide frequency signal using the first to fourth wide time constants.

The wide area gain compensator 157 generates a first output signal using the first compensation signal. In other words, the global gain compensator 157 sets a global gain constant to compensate for the gain in the first compensation signal. The wide gain compensator 157 generates a first output signal using the first compensation signal and the wide gain constant.

The second stabilization controller 160 includes a second frequency blocker 173, a local phase compensator 175, and a local gain compensator 177.

When the second frequency cutout 173 receives the local frequency signal from the signal filter unit 120, the second frequency cutoff unit 173 provides the local phase compensation unit 175. The input to the compensation unit 175 is blocked. In detail, the second frequency blocking unit 173 sets a blocking time constant to prevent the normal output frequency signal from being input into the second stabilization control unit 160. In this case, the blocking time constant of the second frequency blocking unit 173 may be the same as the blocking time constant of the first frequency blocking unit 153. The second frequency cutoff unit 173 cuts off the input of the normal output frequency signal by using the cutoff time constant when the normal output frequency signal is provided to the second stabilization control unit 160.

The local phase compensator 175 receives the local frequency signal from the second frequency blocker 173. In other words, the local phase compensator 175 sets a local center signal which is a signal centered on the local frequency signal. In this case, the regional center signal may indicate a frequency band shorted by the generator 370. The local phase compensator 175 generates a local time constant including the first to fourth regional time constants using the regional center signal. The local phase compensator 175 generates a second compensation signal by compensating for the phase delay of the local frequency signal using the first to fourth local time constants.

The local gain compensator 177 generates a second output signal by compensating the gain of the second compensation signal using the local gain integer. The local gain compensator 177 sets a local gain integer to compensate for the gain in the second compensation signal.

A method of stabilizing a power system according to an embodiment of the present invention will be described with reference to FIGS. 4 to 6.

4 is a flowchart illustrating a power system stabilization method according to an embodiment of the present invention.

Referring to FIG. 4, the power system stabilization apparatus 100 receives a vibration frequency signal from the generator 370 (S410). That is, the receiver 110 of the power system stabilization apparatus 100 receives the vibration frequency signal Δω ₁ from the generator 370 as shown in FIG. 5. At this time, the vibration frequency signal Δω ₁ is a low frequency vibration generated when an error occurs in the generator 370 and includes 0.1 to 2 Hz (600) as shown in FIG. 6.

The power system stabilization apparatus 100 separates the wide frequency signal and the local frequency signal from the vibration frequency signal (S420). In other words, the signal filter unit 120 of the power system stabilization apparatus 100 separates the wide frequency signal and the local frequency signal from the vibration frequency signal to suppress the low frequency vibration of all bands generated by the generator 370. In this case, the wide frequency signal Δω _G represents the low frequency vibration in the wide mode and may be 0.1 to 0.8 Hz 610 as shown in FIG. 6, and the local frequency signal Δω _L is the low frequency vibration in the local mode. It may represent 0.8 to 2Hz (620) as shown in FIG.

The power system stabilization apparatus 100 generates a wide time constant to compensate for the phase delay of the wide frequency signal (S430). Specifically, when the normal output frequency signal or the normal output frequency signal is input to the first frequency cutoff unit 153 of the power system stabilization apparatus 100 together with the vibration frequency signal, the first frequency cutoff unit 153 is shown in FIG. As shown in FIG. 5, the normal output frequency signal is blocked from being input to the first stabilization controller 140 using the blocking time constant T _w . For example, the blocking time constant may be set to 2 to 10 sec. The wide area phase compensator 155 sets a wide area center signal with respect to the wide frequency signal Δω _G received from the first frequency blocker 153. The wide area phase compensator 155 generates the first to fourth wide time constants T ₁ , T ₂ , T ₃ , and T ₄ as shown in FIG. 6 using the wide center signal. The wide area phase compensation unit 155 may define the first wide time constant as shown in Equation 1 below.

[Equation 1]

Where f _c is a wide center signal, T ₁ is a first wide time constant, and T ₂ is a second wide time constant. That is, the wideband phase compensator 155 may generate the first wide time constant, T ₁ , by substituting the wide center signal into f _c of Equation 1 below. Then, the broadband phase compensation section 155 is T ₁ is the first generation of broadband time constant, and by substituting the number of the first wide time constant of T ₁ of Equation 1 to generate the second wide visibility of T ₂ Can be. In this case, the second wide time constant T ₂ may be 1/10 of the first wide time constant T ₁ . Further, the first wide time constant T ₁ increases the phase level of the wide frequency signal Δω _G , and the second wide time constant T ₂ decreases the phase level of the wide frequency signal Δω _G. Let's do it. Accordingly, the wide area phase compensator 155 increases and decreases the phase level of the wide frequency signal Δω _G using the first wide time constant T ₁ and the second wide time constant T ₂ . Delay can be compensated.

The wide-area phase compensator 155 generates the third wide-area time constant T ₃ in the same manner as the first wide-area time constant T ₁ , and the fourth wide-area time constant T ₂ is the same as the second wide-area time constant T ₂ . Time constant T ₄ can be generated. Meanwhile, each of the third wide time constant T ₃ and the fourth wide time constant T ₄ is the first wide time constant T ₁ and the second wide time constant according to the received wide frequency signal Δω _G. It may be generated differently from (T ₂ ). As shown in FIG. 6, the reason for compensating the phase delay using the _first to fourth wide time constants T ₁ , T ₂ , T ₃ , and T ₄ is because of the first wide time constant and the second wide area. This is because the phase compensation is not perfect in the case of time constants T ₁ and T ₂ .

The power system stabilization apparatus 100 generates a first output signal by converting a wide frequency signal using the first to fourth wide time constants (S440). Specifically, the global phase compensator 155 of the power system stabilization apparatus 100 may select T ₁ , T ₂ , T ₃ , and T _{4 from} each of the _first to fourth wide time constants as illustrated in FIG. 5. Substituting into each of these phases compensates for the phase delay of the wide frequency signal Δω _G to generate a first compensation signal.

The wide area gain compensator 157 then sets a wide area gain constant. That is, the wide area gain compensator 157 generates the first output signal by adding the wide area gain integer K _G and the first compensation signal as shown in FIG. 5.

The power system stabilization apparatus 100 generates a local time constant to compensate for the phase delay of the local frequency signal (S450). Specifically, the second frequency cutoff unit 173 of the power system stabilization apparatus 100 uses the cutoff time constant T _w as shown in FIG. 5 to output the normal output frequency signal provided to the second stabilization control unit 160. By blocking the input to the second stabilization control unit 160. In addition, the second frequency blocker 173 passes the local frequency signal Δω _L received from the signal filter unit 120 and provides the local frequency compensation unit 175.

Then, the local phase compensation block 175 is a first local time constant 1 to 4 as shown in Fig. 5, by setting the area center signal, and by using the local center signal of the local frequency signal (T _5, T _6, T ₇ , T ₈ ). The generation method of the first local time constant to the fourth local time constant (T ₅ , T ₆ , T ₇ , T ₈ ) may include the first local time constant to the fourth local time constant (T ₁ , T ₂ , T ₃ , T). ₄ ) the same method as the generation method will be omitted.

The power system stabilization apparatus 100 generates a second output signal by converting the local frequency signal using the first to fourth local time constants (S460). In other words, the regional phase compensator 175 of the power system stabilization apparatus 100 may select T ₅ , T ₆ , T ₇ , and T _{8 from} each of the first to fourth local time constants as shown in FIG. 5. Substituting into each of them compensates for the phase delay of the local frequency signal DELTA omega _L to generate a second compensation signal.

Thereafter, as shown in FIG. 5, the local gain compensator 177 adds the first compensation signal and the local gain integer K _L to generate a second output signal.

The power system stabilization apparatus 100 generates an operation signal using the first output signal and the second output signal (S470). That is, the generation unit 190 of the power system stabilization apparatus 100 generates an operation signal by adding the first output signal and the second output signal as illustrated in FIG. 5. The reason for the operation signal is to separate each of the wide frequency signal and the local frequency signal from the vibration frequency signal to suppress the transmission to the generator 370.

The power system stabilization apparatus 100 generates a damping voltage signal using the operation signal (S480). In other words, the output limiting unit 195 of the power system stabilization apparatus 100 generates a damping voltage signal by limiting the operation signal to voltage range information. In this case, the voltage range information may be set according to the size of the automatic voltage regulator 350. For example, the voltage range information may set 10% as the maximum voltage information and −10% as the minimum voltage information in the size of the automatic voltage regulator 350. The transmitter 210 transmits the damping voltage signal Vst generated by the output limiter 195 to the automatic voltage regulator 350 as shown in FIG. 5. At this time, the automatic voltage regulator 350 receives a control signal generated by adding the damping voltage signal Vst and the reference voltage signal Vref.

Thereafter, the output management unit 230 of the power system stabilization apparatus 100 receives the damping voltage signal from the output limiting unit 195 and provides the damping voltage signal to the output unit 240 to output the output through the output unit 240. do. In this case, the display unit 250 of the output unit 240 may display the damping voltage signal.

The output manager 230 receives the output signal Pe received from the generator 370 as shown in FIG. 5. The output manager 230 performs Fourier transform on the output signal to generate frequency information. The output manager 230 provides the generated frequency information to the display unit 250 of the output unit 240. The display unit 250 displays frequency information.

In addition, the output manager 230 receives the vibration frequency signal and the other vibration frequency signal from the generator 370 as shown in FIG. The output manager 230 compares the vibration frequency signal Δω ₁ and the other vibration frequency signal Δω ₂ to generate a comparison value. The output manager 230 generates notification information when the comparison value is greater than or equal to the reference value. The output manager 230 provides the notification information to the display unit 250 and the light emitting unit 260 of the output unit 240. The display unit 250 displays the notification information, and the light emitter 260 emits light using the notification information.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention as set forth in the claims below It will be appreciated that modifications and variations can be made.

100: power system stabilization device
120: signal filter
130: stabilization control unit
140: first stabilization control unit
160: second stabilization control unit
180: signal processing unit
190 generation unit
195: output limit
230: output management unit
240: output unit
350: automatic voltage regulator
370: generator

Claims (17)

delete delete delete delete delete In the power system stabilization device connected to the power system,
A signal filter for separating a wide frequency signal and a local frequency signal from the vibration frequency signal received from the power system;
A first stabilization controller configured to set a wide center signal for the wide frequency signal, generate a wide time constant using the wide center signal, and generate a first output signal using the wide frequency signal and the wide time constant ;
A second stabilization controller configured to set a local center signal for the local frequency signal, generate a local time constant using the local center signal, and generate a second output signal using the local frequency signal and the local time constant; ; And
A signal processor configured to generate a damping voltage signal using the first output signal and the second output signal;
The first stabilization control unit may include a global phase compensator configured to compensate for a phase delay of the wide frequency signal using the wide time constant to generate a first compensation signal; And a global gain compensator for generating the first output signal using the first compensation signal and a global gain integer;
The second stabilization control unit may include a local phase compensator configured to compensate for a phase delay of the local frequency signal using the local time constant to generate a second compensation signal, and the second compensation signal and a local gain integer. A local gain compensator for generating a second output signal;
Each of the first and second stabilization controllers further includes a frequency blocking unit for preventing input of a normal output frequency signal received from the power system.
The method of claim 6,
And the frequency cutoff unit sets a cutoff time constant for cutting off the normal output frequency signal and prevents input of the normal output frequency signal using the cutoff time constant.
The method of claim 6,
The signal processor may include a generation unit configured to generate an operation signal by calculating the first output signal and the second output signal; And an output limiting unit configured to generate the damping voltage signal by limiting the operation signal to voltage range information according to the power system.
The method of claim 6,
And an output management unit configured to generate a comparison value by comparing the vibration frequency signal with another vibration frequency signal received from another power system connected to the power system, and generating notification information when the comparison value is equal to or greater than a reference value. Power system stabilization device.
10. The method of claim 9,
The power system stabilization apparatus further comprises an output unit for outputting the notification information.
delete delete delete delete In a method for stabilizing a power system by a power system stabilizing device connected to the power system,
(a) separating a wide frequency signal and a local frequency signal from vibration frequency signals received from a power system;
(b) generating a wide time constant using a wide center signal for the wide frequency signal, and generating a first output signal using the wide frequency signal and the wide time constant;
(c) generating a local time constant using a local center signal with respect to the local frequency signal, and generating a second output signal using the local frequency signal and the local time constant; And
(d) generating a damping voltage signal using the first output signal and the second output signal;
In step (b),
(b-1) setting the wide center signal for the wide frequency signal;
(b-2) generating a wide time constant using the wide center signal; And
(b-3) generating a first compensation signal by compensating for a phase delay of the wide frequency signal using the wide time constant; And
(b-4) generating the first output signal using the first compensation signal and a wide area gain integer;
In step (c),
(c-1) setting the local center signal with respect to the local frequency signal;
(c-2) generating the local time constant using the local center signal; And
(c-3) generating a second compensation signal by compensating for the phase delay of the local frequency using the local time constant;
(c-4) generating the second output signal using the second compensation signal and a local gain integer.
16. The method of claim 15,
In step (d),
(d-1) generating an operation signal by performing an addition operation on the first output signal and the second output signal; And
(d-2) generating the damping voltage signal by limiting the operation signal to voltage range information according to the power system.
16. The method of claim 15,
After step (a),
Receiving another vibration frequency signal from another power system connected to the power system; Wow
Generating notification information by comparing the vibration frequency signal received in the step (a) with the other vibration frequency signal; And
The power system stabilization method further comprises the step of outputting the notification information.

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