KR100900409B1 - One-heatsink booster pump multi-inverter with change drive function using loss power estimation - Google Patents

Abstract

A booster pump system including a multi inverter is provided to increase the reliability of the whole booster pump system by reducing the effect or the vibration or the noise. A booster pump system including a multi inverter comprises a plurality of the inverter module(#X, #Y). The inverter module is mounted on one heat sink and interconnected with a telecommunication line. The inverter module is consisting of an electricity part and a controller. The electricity part is comprised of a PIM, a smoothing capacitor, a voltage sensor and a current sensor. The smoothing capacitor smoothes the DC power supply. The voltage sensor detects the smoothed direct current voltage. The current sensor detects the output voltage of an inverter part. The controller is consisting of a PID controller, an alternation driving control part, a V / f controller, a PWM generator, a three-direction phase / two-direction phase converter and a loss calculation part. The PID controller outputs the pump order revolution about the configuration pressure according to the inputted discharge pressure. The alternation driving control part performs the alternation driving according to the pump order revolution and loss and outputs the pump RPM of each inverter module. The V / f controller determines the output voltage of the inverter according to the pump RPM. The PWM generator generates a signal controlling the inverter part according to the output voltage of the inputted inverter. The three-direction phase / two-direction phase converter changes the three-phase current to the two-phase current. The loss calculation part computes the accumulation loss.

Description

One-heatsink Booster Pump Multi-Inverter with Change Drive Function using Loss Power Estimation}

The present invention is an inverter for driving a booster pump in a booster pump system, by applying a single heat sink structure to a plurality of inverter modules mounted on a single heat sink to configure a multi-inverter in which one inverter drives a plurality of pumps and each The present invention relates to a booster pump system having a multi-inverter using an alternating operation of an inverter module by adding a function of estimating a loss amount of an inverter module and calculating a cumulative loss amount.

In recent years, the constant pressure control method of the booster pump system mainly uses the pump rotation speed control method using an inverter. The pump rotation speed control method includes a single pump inverter control method and an individual pump inverter control method according to the number of inverters controlling the pump rotation speed. In the single pump inverter control method, only one pump is controlled by the inverter according to the flow rate of the discharge unit, and the other pumps are indirect operation. The single pump inverter control method controls the rotation speed of the pump according to the flow rate, so that the discharge pressure can be controlled relatively accurately. However, the pumps other than the pump controlled by the inverter are indirect operation at the start, so the starting current of the motor is large and the high pressure is applied to the discharge pipe. On the other hand, the individual pump inverter control method is an excellent control method because each pump is driven by the inverter individually to prevent the instantaneous overcurrent of the pump and to finely control the discharge pressure according to the discharge flow rate change. In addition, this control method can independently control the rotation speed of each pump, and can accurately obtain the operation status and load of the booster pump system and the operation status of each pump. Individual pump inverter control methods include individual inverter method and multi inverter method according to the inverter configuration method. The individual inverter method is to install a single inverter in each pump or to install a single inverter as many as the number of pumps in the panel. Directly mounting a single inverter on each pump can cause the vibration and noise of the pump to be directly transmitted to the inverter when the booster pump is operating, which can adversely affect the inverter, and set each inverter to each pump and electrically wire the pump. This complicates the manufacturing process. In addition, when a system is constructed by attaching as many inverters as the number of pumps to an electric panel, a new electric panel is required, and a lot of relay devices and additional exhaust devices must be provided inside the panel, thereby increasing the manufacturing cost of the entire system. The multi-inverter method has a structure in which a plurality of pumps are configured by mounting an inverter module as many as the number of pumps in one mechanism and configuring one inverter. This multi-inverter configuration not only has a smaller overall size than the individual inverter type, but also makes the electrical wiring of the pump simpler and less susceptible to vibration or noise of the pump, thereby increasing the reliability of the entire system.

 The present invention is an inverter for driving a booster pump in a booster pump system, by applying a single heat sink structure to a plurality of inverter modules mounted on one heat sink to configure a multi-inverter in which one inverter drives a plurality of pumps and inverter module The present invention proposes a method of configuring and controlling a single heat sink structure booster pump multi-inverter using an alternate operation of an inverter module by adding a function of estimating a loss amount of the accumulated loss amount.

An object of the present invention is a booster pump system using an inverter, the heat dissipation characteristics of the entire system because the inverter of the individual heat dissipation structure composed of a plurality of single inverters has a disadvantage that the lifespan of the single inverter is jagged because the heat dissipation conditions of the entire system is uneven. The present invention provides a booster pump system having multiple inverters in which a plurality of inverter modules are mounted on a single heat sink structure in order to reduce the amount of losses occurring in the inverter and increase the lifetime of the entire system by applying the multiple inverters.

The present invention provides a booster pump system comprising a single heat sink booster pump multi inverter for solving the above problems,

The multi inverter

A plurality of inverter modules are mounted on one heat sink and a connection structure for distributing the input power source 1 to the inverter module 2. The inverter module 2 discharges the booster pump 4 from the pressure sensor 3. One booster pump 4 is driven under pressure, and each inverter module 2 is connected to each other by a communication line. The inverter module is supplied with AC power from an input power source and has a variable voltage-variable frequency. PIM for converting to PIM and PIM for converting AC power to DC power and inverter for converting smooth DC power into AC power of variable frequency-variable voltage by receiving signal from PWM generator and PIM for measuring PIM temperature A smoothing capacitor for smoothing the DC power rectified by the temperature sensor and the rectifying unit; a voltage line detecting the smoothing DC voltage by the smoothing capacitor; Pump rotation of the slave inverter module using the current sensor for detecting the output current of the butter part, the PID controller that controls the pump's command speed according to the command pressure and the discharge part, and the cumulative losses obtained from the slave inverter module and the pump command speed. The V / f controller determines the output voltage of the inverter module by receiving the shift operation control unit controlling the number and the pump rotation speed output from the master inverter module, and the three-phase current detected by the current sensor connected to the inverter unit. Accumulated loss amount of inverter module using 3 phase / 2 phase converter converting to phase current and output voltage of inverter module determined by V / f controller, DC voltage detected by voltage sensor and PIM temperature detected by PIM temperature sensor A loss amount calculation unit that calculates the loss amount of each inverter module and calculates the accumulated loss amount. By using this as an indicator of the shift operation to provide a single heat sink booster pump multi-inverter system including a booster pump, characterized in that for uniformly distributing the duty of the inverter module to reflect the cumulative degree of fatigue of each of the inverter modules in reality.

First, the multi-inverter mounting a plurality of inverter modules on a single heat sink is a relatively small heat dissipation effect can be obtained because only a few operating on a relatively large heat sink when only a small number of the entire inverter module operating the inverter module Reduced losses increase the efficiency of the overall system, reduce the overall size of the system to individual inverter configurations, simplify the electrical wiring of the pump, and reduce the effects of vibration or noise on the pump, making the overall booster pump system more reliable.

Second, in the inverter module of the multi-inverter, the loss amount of each inverter module is estimated by using information such as ambient temperature, operating environment, output current, and switching element characteristics, and the cumulative loss amount is calculated and used as an index of shift operation. The cumulative fatigue can be realistically reflected, thus evenly distributing the utilization of the inverter module, thus extending the life of the entire booster pump system.

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

1 is a block diagram of the internal inverter module of the single heat sink multi inverter of the present invention. Inside the multi inverter, inverter module #X and inverter module #Y are mounted on one heat sink. Each inverter module is divided into a control unit and a power unit, and the power unit has a power integrated module (PIM) which is a power semiconductor switch. PIM is a device that actually converts power, and loss occurs during power conversion, and the loss appears in the form of heat, and heat is radiated through the heat sink. The control unit of each inverter module is configured to communicate with each other through a communication line.

2 is a block diagram of a booster pump system employing a single heat sink multi inverter of the present invention. The booster pump system is a system that connects several booster pumps in parallel and controls the rotation speed of the booster pump to supply the required flow rate of the discharge portion. The booster pump system employing a single heat sink multi-inverter includes a pressure sensor (3) for detecting the pressure of the input power supply (1) for supplying power to the entire system and the discharge part of the booster pump (4); It consists of a single heat sink multi inverter 2 which is supplied power from the input power source 1 and controls the rotation speed of each pump, and a booster pump 4 which is controlled by a single heat sink multi inverter and supplies the required flow rate of the discharge part. . A single heat sink multi inverter has a plurality of inverter modules mounted on a single heat sink, each booster pump 4 and the pressure sensor (3) is connected, and controls the number of revolutions of each booster pump (4) independently. In addition, the inverter module is connected to each other by a communication line to share the operating state information of each booster pump (4) and the master inverter module interlocked control the entire inverter module.

3 is a control block diagram of a single heat sink booster pump inverter of the present invention. Single heat sink booster pump multi inverter (2) is composed of several inverter modules in hardware, the inverter module divides the AC power supplied from the input power (1), each inverter module #X is input power (1) receiving a variable frequency to the booster pump (4) and the rectifying section of the PIM (2-1) to supply ac power of variable voltage, PIM (2-1) converts the AC power to the input power supply 1 to the direct-current power supply ( 2-1-1) and the inverter unit 2-1-2 for converting smoothed DC power into AC power of variable frequency-variable voltage, and the PIM temperature sensor 2 for measuring the internal temperature of the PIM 2-1. -1-3). And a smoothing capacitor 2-2 for smoothing the DC power rectified in the rectifying unit 2-1-1, and a voltage sensor 2-4 for detecting the smoothed DC voltage, and an inverter unit 2-1-. The current sensor 2-3 which detects the output current of 2) is comprised.

)을 입력받아 설정압력(

)에 대해서 펌프 지령 회전수(

)이 출력되는 PID 제어기(2-9)와 PID 제어기(2-9)에서 출력된 펌프 지령 회전수(

)와 각 인버터 모듈에서 통신선로를 통해 전달된 손실량(

,

, …

)을 입력받아 각 인버터 모듈의 교대운전을 수행하여 각 인버터 모듈의 펌프 회전수(

,

, …

)를 출력하는 교대운전 제어부(2-10)로 구성되어 있다. 인버터 모듈의 슬레이브 제어부는 펌프 운전을 제어하기 위해 마스터 제어부의 펌프 회전수(

)에 따라 인버터의 출력전압(

,

)를 결정하는 V/f 제어기(2-5)와 인버터의 출력전압(

,

)을 입력받아 인버터부(2-1-2)를 제어하는 신호를 발생시키는 PWM 발생부(2-6)이 있으며 인버터부(2-1-2)의 출력에 연결된 전류센서(2-3)에서 검출한 3상 전류(

,

,

)를 2상 전류(

,

)로 변환 시키는 3상/2상 변환기(2-7)과 2상 전류(

,

)와 인버터의 출력전압(

,

), PIM 온도센서(2-1-3)의 출력인 PIM 온도(

)와 전압센서(2-4) 의 출력인 직류전압(

)와 인버터부(2-1-2)의 설정된 스위칭 주파수(

)을 입력 받아 누적 손실량(

)을 연산하는 손실량 계산부(2-8) 로 이루어져 있다. The control unit of the single heat sink booster pump multi inverter 2 having the alternating operation function using the loss amount of the present invention includes a slave control unit and a master control unit. The master controller operates only in the inverter module that controls the entire system among the inverter modules, and the slave controller operates in the whole inverter module. The master controller controls the current discharge pressure detected by the pressure sensor 3 installed in the discharge portion of the booster pump 4.

) And the set pressure (

Pump command rotation speed ()

) Pump command rotation speed (2) output from PID controller (2-9) and PID controller (2- 9 )

) And the amount of loss delivered over the communication lines in each inverter module (

,

,…

) And the rotation of the pump of each inverter module

,

,…

) Is composed of an alternating operation control unit 2-10. The slave controller of the inverter module controls the pump speed of the master controller to control the pump operation.

Output voltage of the inverter

,

Output voltage of V / f controller (2-5) and inverter (

,

) Is a PWM generator (2-6) for generating a signal to control the inverter unit (2-1-2) and the current sensor (2-3) connected to the output of the inverter unit (2-1-2) 3-phase current detected by

,

,

) To the 2-phase current (

,

3 phase / 2 phase converter (2-7) and two phase current (

,

) And inverter output voltage (

,

), PIM temperature (output from PIM temperature sensor (2-1-3)

) And DC voltage (output of the voltage sensor 2-4)

) And the set switching frequency of the inverter unit (2-1-2)

) And the cumulative loss (

It is composed of a loss amount calculation unit (2-8) for calculating).

4 is a flowchart illustrating a loss amount calculation of the single heat sink booster pump multi inverter of the present invention. The method of calculating the accumulated loss amount of the inverter module is described in detail as follows. In the period of calculating the cumulative loss (K-th Sampling)

)를 입력 받아PIM(2-1)의 인버터부(2-1-2)에서 IGBT의 도통시 포화전압(

)과 온-상태 저항(

)을 아래의 수식 식2-4와 2-5를 이용하여 추정하고 다이오드의 도통시 포화전압(

)과 온-상태 저항(

)을 식 4-1과 4-2를 이용하여 추정한다.S1: PIM temperature (

) And the saturation voltage of conducting IGBT at conduction (2-1-2) of PIM (2-1)

) And on-state resistance (

) Is estimated using Equations 2-4 and 2-5 below and the saturation voltage (

) And on-state resistance (

) Is estimated using Equations 4-1 and 4-2.

)과 온-상태 저항(

)와 다이오드의 도통시 포화전압(

)과 온-상태 저항(

)을 입력 받아 인버터부(2-1-2)의 스위칭 소자의 손실(

)을 식 1을 이용하여 구한다. 이때 IGBT의 도통손실(

)은 식 2와 식 2-1~5를 이용하여 구하고 IGBT의 스위칭 손실(

)은 식 3을 이용하고 인버터부(2-1-2)의 스위칭 주파수(

)와 사용되는 스위칭 소자의 데이터 시트의 정보를 이용하여 구한다. 또한 다이오드의 도통손실(

)은 식 4와 식 2-1~3, 4-1~2를 이용하여 구하고 다이오드의 OFF 손실(

)은 식 5와 인버터부(2-1- 2)의 스위칭 주파수(

)와 사용되는 스위칭 소자의 데이터 시트의 정보를 이용하여 구한다.S2: Saturation voltage at conduction of IGBT estimated from S1 (

) And on-state resistance (

) And saturation voltage during conduction of diode

) And on-state resistance (

) Loss of the switching element of the inverter section 2-1-2 (

) Is obtained using Equation 1. At this time, IGBT conduction loss (

) Is obtained using Equation 2 and Equations 2-1 to 5, and IGBT switching loss (

) Is expressed by Equation 3 and the switching frequency of the inverter section 2-1-2

) And the data sheet of the switching element used. In addition, the conduction loss of the diode (

) Is obtained using Equation 4, Equation 2-1 ~ 3, 4-1 ~ 2, and the OFF loss of diode (

Is the switching frequency of the inverter unit (2-1-2)

) And the data sheet of the switching element used.

)를 누적하여 누적 손실량(

)을 구한다. S3: Loss of the switching element obtained in step S2 (

) To accumulate cumulative losses (

)

5 is an alternate operation control flowchart of a single heat sink booster pump multi inverter of the present invention. Herein, the shift operation control method for the multi inverter of the present invention will be described in detail. In a single heat sink booster pump multiple drive control cycle (K-th Sampling)

S1: Determine whether the inverter module is the master inverter module or slave inverter module. Since the shift operation method of the present invention operates only in the master inverter module, if the current inverter module is the master inverter module, it is sent to step S2, and if the slave inverter module does not perform the shift operation control.

S2: Detects the operating inverter module being output and the stationary inverter module not outputting among all inverter modules and moves to S3.

S3: Stops the operation inverter module with the highest accumulated loss amount among the operation inverter modules being output among all inverter modules.

S4: Operate the stationary inverter module with the lowest accumulated loss among stationary inverter modules that do not output among all inverter modules. Go to the next control cycle.

)을 구하기 위한 수식이다.The formula below shows the loss of the switching semiconductor element of the inverter module.

)

(1)

(One)

(2)

(2)

From here

이고 (2-1)The peak value of the load current is

And (2-1)

이며, (2-2)Modulation Index

(2-2)

이다. (2-3)Load factor

to be. (2-3)

이고 (2-4)IGBT saturation voltage

And (2-4)

이다. (2-5)On-State Resistance of IGBTs

to be. (2-5)

은 스위칭 소자의 내부온도이다.

Is the internal temperature of the switching element.

(3)

(3)

From here

: 특정 조건에서의 IGBT의 턴-온 손실[mJ] ](125℃ -데이터 시트)

: IGBT turn-on loss [mJ] at specific conditions (125 ° C-data sheet)

: 특정 조건에서의 IGBT의 턴-오프 손실[mJ] ](125℃ -데이터 시트)

: Turn-off loss [mJ] of IGBT under specific conditions (125 ° C-data sheet)

: 특정 조건에서의 IGBT의 전류 [A] - 데이터 시트

: Current of IGBT under specific conditions [A]-Data sheet

: 특정 조건에서의 IGBT의 전압 [V] - 데이터 시트

: Voltage of IGBT under specific conditions [V]-Data Sheet

: 인버터 직류링크 전압[V]

Inverter DC link voltage [V]

: 스위칭 소자의 스위칭 주파수[Hz]이다.

: The switching frequency [Hz] of the switching element.

(4)

(4)

here

이고 (4-1)Diode saturation voltage

And (4-1)

이다. (4-2)Diode On-State Resistance

to be. (4-2)

(5)

(5)

: 특정 조건에서의 다이오드의 턴-오프 손실[mJ](125℃) -데이터 시트

: Turn-off loss [mJ] (125 ° C) of diode under specific conditions-data sheet

: 특정 조건에서의 다이오드의 전류 - 데이터 시트

: Current of diode under specific conditions-data sheet

: 특정 조건에서의 다이오드의 전압 - 데이터 시트

: Voltage of diode under specific conditions-data sheet

1 is an internal inverter module configuration of a single heat sink multi inverter of the present invention

Figure 2 is a block diagram of a booster pump system using a single heat sink multi inverter of the present invention

3 is a control block diagram of a single heat sink booster pump multi inverter of the present invention;

Figure 4 is a flow chart of the loss calculation of the single heat sink booster pump multi inverter of the present invention

5 is a flow chart of alternate operation control of a single heat sink booster pump multi inverter of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

1: 3-phase input power

2: single heat dissipation booster pump multi inverter

2-1: PIM (Power Integrated Module)

2-1-1: Rectifier 2-1-2: Inverter

2-1-3: PIM Temperature Sensor

2-2: Smoothing Capacitor 2-3: Current Sensor

2-4: Voltage Sensor 2-5: V / f Controller

2-6: PWM generator 2-7: 3 phase / 2 phase converter

2-8: Loss amount calculator 2-9: PID controller

2-10: Shift operation control

3: discharge part pressure sensor 4: booster pump

Claims (1)

On the heat sink is mounted a plurality of inverter modules connected by mutual communication lines, In the booster pump system having a multi-inverter for input power is distributed to each inverter module, the inverter module receives the discharge pressure of the booster pump from the pressure sensor to drive the booster pump corresponding to the inverter module, The inverter module is composed of a power unit and a control unit, The power unit receives the AC power from the input power source and converts the variable voltage to a variable frequency; A smoothing capacitor for smoothing a DC power supply; A voltage sensor detecting a smoothed DC voltage; Consists of a current sensor for detecting the output voltage of the inverter unit, The control unit The current discharge pressure detected by the pressure sensor 3 installed in the discharge portion of the booster pump 4 (

) And the set pressure (

Pump command rotation speed ()

PID controller 2-9 is outputted; The PID controller (2-9) can rotate in the pump output command (

) And the amount of loss delivered over the communication lines in each inverter module (

,

,…

) And the rotation of the pump of each inverter module

,

,…

Shift operation control unit (2-10) for outputting; Pump speed (

Output voltage of the inverter

,

A V / f controller 2-5 for determining < RTI ID = 0.0 > Inverter output voltage

,

) And a PWM generator (2-6) for generating a signal for controlling the inverter (2-1-2); Three-phase current detected by current sensor 2-3 connected to output of inverter section 2-1-2

,

,

) To the 2-phase current (

,

3 to 2 phase converter (2-7) to convert; 2-phase current

,

) And inverter output voltage (

,

), PIM temperature (output from PIM temperature sensor (2-1-3)

) And DC voltage (output of the voltage sensor 2-4)

) And the set switching frequency of the inverter unit (2-1-2)

) And the cumulative loss (

) Booster pump system with a multi-inverter characterized in that it comprises a;

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