KR101367467B1 - Appatatus and method for controlling btb static synchronous compensator - Google Patents

Abstract

The present invention relates to a control device and a method of a BTB stationary reactive power compensation device. A method for controlling a control input input to a BTB (Back to Back) stationary reactive power compensator comprising a rectifier unit and an inverter unit, comprising: a command value of an active current of the rectifier unit, a command value of a reactive current of the rectifier unit, and an inverter unit The command value of the control input and the BTB stationary invalid using a command value of an active current, a command value of the reactive current of the inverter unit, and a command value of a DC voltage applied to the BTB stationary reactive power compensator Calculating a command value for a state variable output from the power compensation device; Generating a feedback control signal using an error between the command value for the state variable and the state variable; And generating the control input by using the command value for the state variable, the command value for the control input, the error, and the feedback control signal. This is provided.

Description

Control system and control method of TV stationary reactive power compensator {APPATATUS AND METHOD FOR CONTROLLING BTB STATIC SYNCHRONOUS COMPENSATOR}

Embodiments of the present invention relate to a control device and a control method of a stationary reactive power compensation device, and more particularly, to a control device and a control method of a stationary reactive power compensation device composed of an inverter stage and a rectifier stage.

STATCOM (Static Synchronous Compensator) system controls the reactive current of the converter to compensate the voltage of the transmission power system and improve the system stability. Compared with the traditional static var compensator (SVC), it has the advantages of faster response, stability, lower harmonics and smaller size. In particular, this equipment, which is the core of the power transmission system using semiconductor switches, actively controls the flow of electricity, so that the output voltage remains constant even when power generation changes suddenly according to weather conditions during the generation of renewable energy such as wind and solar power. To make it possible.

However, the stationary reactive power compensation device is a nonlinear system, and it is not easy to design a controller that guarantees fast and stable voltage regulation at all operating points. Controller design method and type for stationary reactive power compensator system are as follows.

Proportional-Integral (PI) controllers have been widely used in industrial settings because of their ease of design. However, a fixed PI gain can be used only at a certain operating point, and there is a disadvantage that an unstable response can be obtained at another operating point. M. M. Farsangi, Y. H. Song, and Y. Z. Sun, "Supplementary control design of SVC and STATCOM using optimal robust control," International Conference on DRPT, pp. 355-360, 2000.

In addition, a nonlinear controller design method using input-output feedback linearization (IOL) is described in P. Petitclair, S. Bacha, and JP Ferrieux, "Optimized linearization via feedback control law for a STATCOM," in Industry Applications Conference Annual Meeting, vol. 2, pp. 880-885, 1997. Nonlinear controller design techniques have the disadvantages of complex configuration and do not take into account the stability of internal dynamics.

Therefore, a passivity based controller (PBC), which has a simpler configuration than an input / output feedback linear circuit, has been proposed. This is H.-C. Tsai, C.-C. Chu and S.-H. Lee, "Passivity-based nonlinear statcom controller design for improving transient stability of power systems," in IEEE / PES Transmission and Distribution Conference and Exhibition, 2005, pp. It is described in 1-5.

The proposed passive-based controller consists of two current loops and an inner loop, the inner loop controls the D-axis and Q-axis currents, and the outer loop controls the inner DC bus voltage.

However, the proposed passiveness-based controller is applicable only to the first type of stationary reactive power compensator for controlling active power and reactive power using a pulse width modulation (PWM) technique and a converter. There was a problem that is not applicable to the BTB (Back to Back, BTB) stationary reactive power compensation device composed of the rectifier stage.

In order to solve the problems of the prior art as described above, the present invention proposes a control device and a control method of a stationary reactive power compensation device composed of an inverter stage and a rectifier stage.

Other objects of the invention will be apparent to those skilled in the art from the following examples.

According to a preferred embodiment of the present invention to achieve the above object, in the method for controlling the control input input to the BTB (Back to Back) stationary reactive power compensation device consisting of a rectifier unit and an inverter unit, At least one of a command value of a current, a command value of a reactive current of the rectifier unit, a command value of an effective current of the inverter unit, a command value of the reactive current of the inverter unit, and a command value of a DC voltage applied to the BTB stationary reactive power compensator Calculating a command value of the control input and a command value for a state variable output from the BTB stationary reactive power compensator using the command value; Generating a feedback control signal using an error between the command value for the state variable and the state variable; And generating the control input by using the command value for the state variable, the command value for the control input, the error, and the feedback control signal. This is provided.

According to another embodiment of the present invention, in the control device for controlling a control input input to the BTB (Back to Back) stationary reactive power compensation device consisting of a rectifier unit and an inverter unit, the command value of the effective current of the rectifier unit and the rectifier The control input using at least one of a command value of a negative reactive current, a command value of an active current of the inverter unit, a command value of the reactive current of the inverter unit, and a command value of a DC voltage applied to the BTB stationary reactive power compensator. A command calculation unit for calculating a command value of the command value and a state variable output from the BTB stationary reactive power compensation device; A feedback control signal generator configured to generate a feedback control signal using an error between the command value for the state variable and the state variable; And a control input generator configured to generate the control input by using a command value for the state variable, a command value for the control input, the error, and the feedback control signal. A control device is provided.

According to still another embodiment of the present invention, there is provided a method of controlling a control input input to a BTB stationary reactive power compensation device including a rectifier unit and an inverter unit. A program is tangibly embodied and can be read by a digital processing device, the recording medium comprising: a command value of the effective current of the rectifier unit, a command value of the reactive current of the rectifier unit, a command value of the effective current of the inverter unit, and the inverter A command value of the control input and a state variable output from the BTB stationary reactive power compensator using at least one of a command value of a negative reactive current and a command value of a DC voltage applied to the BTB stationary reactive power compensator. Calculating a command value; Generating a feedback control signal using an error between the command value for the state variable and the state variable; And generating a control input by using the command value for the state variable, the command value for the control input, the error, and the feedback control signal.

The control device and control method according to the present invention can be applied to the BTB stationary reactive power compensation device using the modulation index and phase angle of the rectifier part and the phase angle of the inverter part as control inputs.

Therefore, according to the present invention, the transient response performance of the effective current and the reactive current of the rectifier unit, the effective current and the DC voltage of the inverter unit can be improved, and the system can be stabilized quickly.

In addition, the application of passiveness-based controls can ensure the stability of the closed loop system.

1 is a diagram illustrating an equivalent circuit of a BTB stationary reactive power compensation device according to an embodiment of the present invention.
2 is a diagram illustrating a control device of a stationary reactive power compensation device according to an embodiment of the present invention.
3 is a diagram illustrating an example of a command value input to a command input unit according to an embodiment of the present invention.
4 is a flowchart illustrating the overall flow of the control method of the BTB stationary reactive power compensation device according to an embodiment of the present invention.
5 is a view showing an example of the time response of the rectifier in the BTB stationary reactive power compensation device according to an embodiment of the present invention.
6 is a view showing an example of the time response of the inverter unit in the BTB stationary reactive power compensation device according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

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

The BTB stationary reactive power compensator is a VSC (Voltage Source Converter) type stationary reactive power compensator based on a high voltage direct current (HVDC) system.

The VSC-HVDC system independently controls reactive power and active power, and transmits bi-directional power without changing the polarity of the DC link voltage. The stability and flexibility of the VSC-HVDC system play an important role in the power generation and power markets.

Conventional VSC-HVDC systems adopt a pulse width modulation (PWM) control strategy or multi-bridge topology for the rectifier and inverter sections. The two stations therefore have symmetrical transformations.

The BTB stationary reactive power compensation device consists of different types of VSCs that share a common direct current link and the rectifier part and the inverter part are connected back-to-back.

The rectifier unit operates reactive power and active power in a power tracking control mode to transfer power using a converter using PWM. The inverter unit operates a converter using a multipulse technique to adjust the DC voltage.

Alternatively, the rectifier unit may use a converter to which the multipulse technique is applied, and the inverter unit may use a converter using PWM.

The BTB stationary reactive power compensator consisting of these different types of VSCs can be installed in a small space at low cost and has low power loss. This is because the VSC using the multipulse technique does not have a harmonic frequency.

Hereinafter, the BTB stationary reactive power compensation device will be described in more detail with reference to FIG. 1.

1 is a diagram illustrating an equivalent circuit of a BTB stationary reactive power compensation device according to an embodiment of the present invention.

Referring to FIG. 1, in the BTB stationary reactive power compensation device, the rectifier unit 101 and the inverter unit 103 are connected to Vectuvec. Here, the rectifier unit 101 and the inverter unit may be located at a very long distance physically.

According to an embodiment of the present invention, the rectifier unit 101 is a VSC using a PWM technique, and the inverter unit 103 is a VSC using a multipulse technique.

는 정류기부(101)와 인버터부(103)의 3상 phase-to-neutral bus 전압이며,

는 인버터의 교류 측 터미널의 전압,

,

는 정류기부(101)와 인버터부(103)의 3상 전류의 흐름을 나타낸다.

Is the three-phase phase-to-neutral bus voltage of the rectifier unit 101 and the inverter unit 103,

Is the voltage at the AC side terminal of the inverter,

,

Denotes the flow of the three-phase current of the rectifier unit 101 and the inverter unit 103.

및

와 각각 병렬로 연결되어 있으며, 각 인덕턴스는 실제 전력 변압기의 누설을 나타낸다.The rectifier unit 101 and the inverter unit 103 have an inductance

And

Are connected in parallel with each other, and each inductance represents the actual power transformer leakage.

와

는 정류기부(101)와 인버터부(103) 각각과 변압기 사이의 전도 손실을 의미한다. Track loss

Wow

Denotes conduction loss between each of the rectifier unit 101 and the inverter unit 103 and the transformer.

는 직류 측 전압을 나타내며

과

는 정류기부(101)와 인버터부(103)와 관련된 직류측 전류를 나타낸다. 커패시터 C와 병렬로 연결되어 있는 저항

는 스위칭 손실을 나타낸다.

Represents the DC side voltage

and

Denotes a direct current side current associated with the rectifier unit 101 and the inverter unit 103. Resistors connected in parallel with capacitor C

Denotes a switching loss.

The AC side circuit vector of the rectifier unit 101 may be expressed by Equation 1 below.

[ Equation 1 ]

,

는 정류기부(101)의 유효 전류 및 무효 전류를 의미한다.

및

는 제어 인자인

및

을 이용하여 하기의 수학식 2와 같이 표현할 수 있다.here,

,

Denotes the effective current and the reactive current of the rectifier unit 101.

And

Is the control factor

And

It can be expressed as shown in Equation 2 below.

& Quot; (2 ) & quot ;

Hereinafter, a control input input to the rectifier unit 101 will be defined as in Equation 3 below to explain the present invention.

& Quot; (3 ) & quot ;

Subsequently, the AC side circuit vector of the inverter unit 103 may be expressed by Equation 1 below.

[ Equation 4 ]

는 인버터부(103)의 유효전류,

는 인버터부(103)의 무효전류를 의미한다.

및

는 제어 인자인

및

를 이용하여 하기의 수학식 5와 같이 표현할 수 있다.here,

Is the active current of the inverter unit 103,

Denotes a reactive current of the inverter unit 103.

And

Is the control factor

And

It can be expressed as shown in Equation 5 below.

[ Equation 5 ]

Hereinafter, a control input input to the inverter unit 103 for the purpose of the present invention will be defined as in Equation 6 below.

[ Equation 6 ]

Instantaneous power at the AC terminal is equal to the value at the DC terminal of the interleaver 103 and can be expressed by Equation 7 below.

[ Equation 7 ]

The two VSCs each composed of the rectifier portion 101 and the inverter portion 103 shown in FIG. 1 share a direct current link with a load resistor that is very negligible. However, in practice, the rectifier unit 101 and the inverter unit 103 are connected through a DC link cable long enough to consider resistance. Therefore, the circuit equation of the DC side of the BTB stationary reactive power compensator may be expressed as Equation 8 below.

[ Equation 8 ]

Therefore, the mathematical mean model of the BTB stationary reactive power compensator system in the state space for the d-q frame may be expressed by Equation 9 below.

& Quot; (9 ) & quot ;

The controller 200 may be designed in consideration of the inherent physical structure and natural waste of energy of the BTB stationary reactive power compensator system. When designing a control unit that does not take into account energy shaping, vibrations can be excited by applying excessive control inputs to the stationary reactive power compensator in a transient state, which reduces the power quality and the time of power transmission. Because it can slow down.

Therefore, the control device can be designed in terms of energy balance or energy waste to stabilize the stationary reactive power compensator system. For this purpose, an average model of the BTB stationary reactive power compensator is expressed as It can be expressed as Euler-Lagrange (EL) model.

[ Equation 10 ]

는 제어 입력,

는 시스템에서의 에너지 소모력,

는 에너지의 보존력,

는 에너지 획득량을 의미한다.here,

Control input,

Is the energy consumption of the system,

Is the conservation of energy,

Is the amount of energy gained.

Equation 9 is converted into an EL model of Equation 10 and expressed as Equation 11 below.

[ Equation 11 ]

를 리드하는 인버터부(103)의 전압 벡터 에 의한 위상각

는 매우 작기 때문에 수식의 간소화를 위해

로 가정할 수 있다.Where voltage vector

Voltage vector of the inverter section 103 that leads Phase angle by

Is very small so for simplicity of formula

.

Accordingly, in the present invention, the control inputs input to the rectifier unit 101 and the inverter unit 103 may be defined as in Equation 12 below.

[ Equation 12 ]

,

는 정류기부(101)에 입력되는 제어 입력,

는 인버터부(103)에 입력되는 제어 입력을 의미한다.

,

Is a control input input to the rectifier unit 101,

Denotes a control input input to the inverter unit 103.

Accordingly, Equation 11 may be expressed as Equation 13 below.

& Quot; (13 ) & quot ;

When the average model of the BTB stationary reactive power compensator is represented by the Euler-Lagrange (EL) model, the system is stable when the derivative of the Lyapunov function candidate has a negative value with respect to time. can do.

Hereinafter, a control device for controlling a control input signal input to the BTB stationary reactive power compensator which follows the command value of the reactive current and the active current of the rectifier unit 101 and keeps the value of the DC voltage constant. It will be described using the above-described equations.

2 is a block diagram illustrating a BTB stationary reactive power compensation system according to an embodiment of the present invention.

Referring to FIG. 2, the stationary reactive power compensator system includes a control device 200 and a BTB stationary reactive power compensator 210. The control device 200 includes a command input unit 201, a command calculation unit 203, It may include a feedback control signal generator 205 and a control input generator 207.

The command input unit 201 receives a command value of the active current and the reactive current of the rectifier 101 from a user. In addition, a command value of any one of the command value of the DC voltage, the effective current of the inverter unit 103 and the command value of the reactive current is applied to the BTB stationary reactive power compensator 210. That is, the command values of all three state variables can be input. Here, the command values of the active current and the reactive current mean values of the active current and the reactive current desired by the user to be output from the BTB stationary reactive power compensation device 210.

The reason for receiving only one of the command values of the effective current, the reactive current command value, and the DC voltage command value of the inverter unit 103 is because the remaining command values can be calculated with any one command value.

For example, when the command value of the effective current of the inverter unit 103 is input, the command value of the reactive current of the inverter unit 103 and the DC voltage command value may be calculated through Equation 13.

The command calculator 203 calculates a command value of the control input and a command value for the state variable by using the command values of the three state variables input to the command input unit 201. Herein, the state variables include a direct current voltage applied to the BTB stationary reactive power compensator 210, reactive current and active current measured at the output of the rectifier unit 10, reactive current and active current measured at the output of the inverter unit 103. The command calculator 203 may calculate a command value of a control input and a command value for a state variable using Equation 13.

,

,

)로 표현할 수 있다. 또한, 상태변수에 대한 지령 값은 정류기부(101)의 유효 전류에 대한 지령 값

, 정류기부(101)무효 전류에 대한 지령 값

, 직류 전압에 대한 지령 값

, 인버터부(103)의 유효 전류에 대한 지령 값

및 인버터부(103)의 무효 전류에 대한 지령 값

로 표현할 수 있다.At this time, the command value for the control input calculated using Equation 13 is (

,

,

). In addition, the command value for the state variable is the command value for the effective current of the rectifier unit 101.

, Command value for the reactive current of the rectifier unit 101

Command value for DC voltage

Command value for the effective current of the inverter unit 103

And a command value for the reactive current of the inverter unit 103

.

3 is a diagram illustrating an example of a command value input to a command input unit according to an embodiment of the present invention.

, 무효 전류에 대한 초기 지령 값

및 BTB 정지형 무효전력 보상장치(210)에 인가되는 직류 전압에 대한 초기 지령 값

, 인버터부(103)의 유효 전류에 대한 초기 지령 값

및 무효 전류에 대한 초기 지령 값

중 적어도 하나 이상의 초기 지령 값을 입력 받으며, 정류기부(101)의 유효 전류에 대한 최종 지령 값

, 무효 전류에 대한 최종 지령 값

및 BTB 정지형 무효전력 보상장치(210)에 인가되는 직류 전압에 대한 최종 지령 값

, 인버터부(103)의 유효 전류에 대한 최종 지령 값

및 무효 전류에 대한 최종 지령 값

중 적어도 하나 이상의 최종 지령 값을 입력 받는다. Referring to FIG. 3, the command input unit 201 is an initial command value for the effective current of the rectifier unit 101 from a user.

Reference value for reactive current

And an initial command value for the DC voltage applied to the BTB stationary reactive power compensator 210

, The initial command value for the effective current of the inverter unit 103

Reference values for and reactive current

At least one initial command value is received and the final command value for the effective current of the rectifier unit 101

, Final reference value for reactive current

And a final command value for the DC voltage applied to the BTB stationary reactive power compensator 210

, The final command value for the effective current of the inverter unit 103

Reference value for reactive current

At least one of the last command value is input.

를 입력 받을 수 있다. 여기서 초기 지령 값은 현재의 BTB 정지형 무효전력 보상장치(210)에서 출력되는 상태변수의 값일 수 있다.Also, the time that changes from the initial command value to the final command value

Can be input. Here, the initial command value may be a value of a state variable output from the current BTB stationary reactive power compensation device 210.

동안 초기 지령 값으로부터 최종 지령 값이 순차적으로 입력되는 경우 BTB 정지형 무효전력 보상장치(210)에서 출력되는 상태변수 값들이 부드럽고 안정적으로 최종 지령 값에 일치될 수 있다.The last command value is not directly input to the command input unit 201, but the time is input to the command input unit 201 as shown in FIG.

If the final command value is sequentially input from the initial command value, the state variable values output from the BTB stationary reactive power compensator 210 may be smoothly and stably matched to the final command value.

Subsequently, the feedback control signal generator 205 generates a feedback control signal using an error between the command value for the state variable and the state variable output from the BTB stationary reactive power compensator 210.

The control input generator 207 generates a control input input to the BTB stationary reactive power compensator 210 using a command value for a control input, a command value for a state variable, an error, and a feedback control signal as a passiveness-based controller. do.

Hereinafter, the command calculator 203 calculates the command value for the control input and the command value for the state variable, the feedback control signal generator 205 generates the feedback control signal, and the control input generator 207. Will be described in more detail below.

When the command calculator 203 calculates the command value for the control input and the command value for the state variable, desired dynamics may be expressed as in Equation 14 below.

[ Equation 14 ].

는 desired dynamics,

는 상태 변수에 대한 지령 값을 의미하며

는 제어 입력에 대한 지령 값을 의미한다.here,

Is the desired dynamics,

Means command value for status variable

Means the command value for the control input.

In addition, the error dynamics can be expressed by Equation 15 below by subtracting Equation 10 from Equation 14.

& Quot; (15 ) & quot ;

는 error dynamics,

는 오차를 의미한다.here,

Error dynamics,

Means error.

In this case, the Lyapunov function candidate may be expressed by Equation 16 below.

& Quot; (16 ) & quot ;

Subsequently, the derivative of Equation 16 may be expressed as Equation 17.

& Quot; (17 ) & quot ;

이므로

의 첫 번째 텀인

는 음의 값을 가진다. 두 번째 텀인

는 하기의 수학식 18과 같이 다시 표현할 수 있다.In Equation (10)

Because of

Is the first term of

Has a negative value. Second term,

Can be expressed again as in Equation 18 below.

& Quot; (18 ) & quot ;

값이 음의 값을 가져야 한다. To calculate the control input for stabilizing the system of the BTB stationary reactive power compensation device 210

The value must have a negative value.

,

,

가 양의 값을 가질 때

가 음의 값을 가지게 된다.If the control input is expressed as Equation 19 below, the feedback control signal

,

,

Has a positive value

Will have a negative value.

& Quot; (19 ) & quot ;

은 정류기부(101)에 입력되는 모듈레이션(modulation) 인덱스 제어 입력,

은 정류기부(101)에 입력되는 위상각 제어 입력,

는 인버터부(103)에 입력되는 위상각 제어 입력을 의미한다.here,

Is a modulation index control input to the rectifier unit 101,

Is a phase angle control input to the rectifier unit 101,

Denotes a phase angle control input to the inverter unit 103.

가 음의 값을 가지는 경우 Lyapunov의 정리에 의해 정지형 무효전력 보상장치(210) 시스템의 평형 점이 안정하다 판단할 수 있다.In other words,

In the case of having a negative value, it can be determined that the equilibrium point of the stationary reactive power compensator 210 system is stable by Lyapunov's theorem.

가 고려된 제곱 오차의 합을 이용하여 모든 상태 변수의 시간 응답을 고려하는 피드백 제어 신호를 생성할 수 있으며 이는 하기의 수학식 20과 같이 표현할 수 있다.The feedback control signal generator 205 is a weight

Using the sum of the squared error is considered to generate a feedback control signal considering the time response of all state variables can be expressed as shown in Equation 20 below.

& Quot; (20 ) & quot ;

가 음의 값을 가지도록 상기에서 구한 제어 입력 지령 값(

), 상태 변수 지령 값(

), 오차 (

) 및 모든 상태의 시간 응답을 고려하는 피드백 제어 신호(

)를 고려하여 실제 제어 입력(

)를 생성할 수 있다.Therefore, the control input generator 207

The control input command value obtained above to have a negative value (

), Status variable command value (

), error (

) And feedback control signals that take into account the time response of all states (

Taking into account the actual control input (

Can be generated.

4 is a flowchart illustrating the overall flow of the control method of the BTB stationary reactive power compensation device according to an embodiment of the present invention.

Referring to FIG. 4, in step S400, the command value of the effective current of the rectifier unit 101, the command value of the reactive current of the rectifier unit 101, the command value of the effective current of the inverter unit 103, and the inverter unit ( The command value of the reactive current command value 103 and the command value of the DC voltage applied to the BTB stationary reactive power compensator 210 are input.

According to an embodiment of the present invention, the plurality of command values may include an initial command value and a final command value, and step S400 may further receive a time interval during the change from the initial command value to the final command value. It may be.

Subsequently, in step S410, a command value for a control input and a command value for a state variable are calculated using the plurality of command values input in step S400.

Here, the state variable is at least one of the active current and the reactive current output from the rectifier unit 101, the DC voltage applied to the BTB stationary reactive power compensator 210, the active current and the reactive current output from the inverter unit 103 It may include.

In step S420, a feedback control signal is generated using an error between the command value for the state variable calculated in step S410 and the state variable output from the BTB stationary reactive power compensator 210.

Finally, in step S430, the control input is calculated using the command value for the control input, the command value for the state variable, the error, and the feedback control signal.

So far, embodiments of the control method of the BTB stationary reactive power compensation device 210 according to the present invention have been described, and the configuration of the control device 200 described with reference to FIGS. 2 to 3 is still applicable to the present embodiment. It is possible. A detailed description thereof will be omitted.

5 is a view showing an example of the time response of the rectifier in the BTB stationary reactive power compensation device according to an embodiment of the present invention.

5 (a) is a time response of the effective current of the rectifier section 101, (b) is a time response of the reactive current of the rectifier section 101, Figure 5 (c) is a phase angle of the rectifier section 101 Time response of the control input, Fig. 5 (d) is a diagram showing the time response of the modulation index control input of the rectifier unit 101, respectively.

Referring to FIG. 5, it can be seen that the active current and the reactive current of the rectifier unit 101 are settling without vibration as the reference active current and the reactive current.

6 is a view showing an example of the time response of the inverter unit in the BTB stationary reactive power compensation device according to an embodiment of the present invention.

6 (a) is a time response of the effective current of the inverter unit 103, FIG. 6 (b) is a time response of the reactive current of the inverter unit 103, FIG. 6 (c) is a time response of the DC voltage, and FIG. d) shows the time response of the phase angle control input of the inverter section 103, respectively.

Referring to FIG. 6, it can be seen that the effective current, the reactive current, and the applied DC voltage of the inverter unit 103 are quickly settling with less vibration as the reference effective current, the reactive current, and the DC voltage.

Therefore, in the BTB stationary reactive power compensator system according to the embodiment of the present invention, the transient response performance of the effective current and the reactive current of the rectifier unit 101 and the effective current and the DC voltage of the inverter unit 103 is improved, so that the system can be quickly replaced. Can be stabilized.

Also. Compared to linear controllers such as PI and PID, it is applied to the BTB stationary reactive power compensator which uses the modulation index and phase angle of the rectifier unit 101 and the phase angle of the inverter unit 103 as control inputs. It is possible to design a control device that takes into account potential energy.

In addition, the application of passiveness-based controls can ensure the stability of the closed loop system.

In addition, embodiments of the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks, and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Examples of program instructions, such as magneto-optical and ROM, RAM, flash memory and the like, can be executed by a computer using an interpreter or the like, as well as machine code, Includes a high-level language code. The hardware devices described above may be configured to operate as at least one software module to perform operations of one embodiment of the present invention, and vice versa.

As described above, the present invention has been described by specific embodiments such as specific components and the like. For those skilled in the art, various modifications and variations are possible from these descriptions. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

101: rectifier section 103: inverter section
200: controller 201: command input unit
203: command calculator 205: feedback control signal generator
207: control input generator
210: BTB static reactive power compensation device

Claims (14)

In the method for controlling a control input input to the BTB (Back to Back) stationary reactive power compensation device consisting of a rectifier unit and an inverter unit,
The command value of the effective current of the rectifier part, the command value of the reactive current of the rectifier part, the command value of the active current of the inverter part, the command value of the reactive current of the inverter part, and the command of the DC voltage applied to the BTB stationary reactive power compensator Calculating a command value for the command value of the control input and a state variable output from the BTB stationary reactive power compensation device using at least one command value among the values;
Generating a feedback control signal using an error between the command value for the state variable and the state variable; And
And generating the control input by using the command value for the state variable, the command value for the control input, the error, and the feedback control signal. The method of claim 1,
The state variable may include at least one of an active current and a reactive current output from the rectifier unit, a DC voltage applied to the BTB stationary reactive power compensator, an active current and an reactive current output from the inverter unit, and the like. Control method of BTB stationary reactive power compensation device. The method of claim 1,
The command value of the effective current of the rectifier part, the command value of the reactive current of the rectifier part, the command value of the active current of the inverter part, the command value of the reactive current of the inverter part, and the command of the DC voltage applied to the BTB stationary reactive power compensator The control method of the BTB stationary reactive power compensation device further comprising the step of receiving at least one of the values. The method of claim 3,
The plurality of command values include an initial command value and a final command value,
And receiving the command value further inputs a time interval during the change from the initial command value to the final command value. The method of claim 1,
The calculating of the command value may include calculating a command value for the control input and a command value for the state variable using an average model of the BTB stationary reactive power compensation device. Control method. The method of claim 1,
The generating of the feedback control signal may include generating the feedback control signal using a squared value of the error. The method of claim 1,
The generating of the control input may include generating the control input using an Euler-Lagrange (EL) model of the BTB stationary reactive power compensation device. The method of claim 1,
The rectifier part is a voltage source converter using a pulse width modulation (PWM) technique, and the inverter part is a voltage source converter using a multipulse technique. . delete delete delete delete delete delete

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