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INVT Medium Voltage VFD in Russia Kaliningrad Water Treatment Plant
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【Abstract】:This paper describes INVT GD5000 medium voltage frequency drive in the Kaliningrad water treatment plant in Russia, and demonstrates in detail the site-frequency operation and the technology improvement and energy saving effect of the frequency conversion reformation.
【Key words】: variable frequency, speed drive, constant pressure water supply, energy saving


INVT medium voltage vfd


1. Overview

With the development of electrical power technology, VFD drive has replaced the previous multi-pump switch and valve-regulated water supply. Starting current can be limited within the rated current, avoiding any impact on the electricity system.. This paper introduces INVT Medium voltage VFD PID function in the water treatment system.
2. Applications
The Kaliningrad water supply plant is mainly responsible for the water supply of the three major districts in Kaliningrad and has three water supply stations in total: 1# 2# 3# three water pumping stations. Each water station has several pumps adopting the main pipe to supply with the PID function of INVT medium voltage VFD, the water supply system will perform a constant pressure water supply program.
3. Principles of constant pressure water supply
In practical engineering, the most widely used regulator control principle is proportional, integral and differential control, referred to as PID control, and also known as PID regulation. That is to control the control amount calculated by proportion, integration, and differentiation. The closed-loop control diagram is as follows:
INVT medium voltage drives manufacturers

Closed-loop control diagram


4. Equipment selection and system configuration

Based on site characteristic of pumps, INVT installed two 6kV/500kW medium voltage VFD and a 6kV/250kW medium voltage frequency inverter from the GD5000 series for the three water pump stations on site. The main technical parameters are as follows:

No.

Item

Parameter 1

Parameter 2

1

Type of the inverter

GD5000-0500-06

GD5000-0250-06

2

Rated capacity

630kVA

315kVA

3

Rated voltage

6kV

6kV

4

Rated current

60A

30A

5

Motor can be equipped

500kW

250kW

6

Quantity

2 sets

1 set

7

Name of the pump station

1# pump station,

2# pump station

3# pump station

                                            

INVT mv drives
Frequency inverter in operation
Motor under load

GD5000 series high-voltage frequency inverters have a built-in PID function, they are flexible to operate. The control connection can adopt a variety of modes, including hard-wired mode and communication mode. According to the actual situation of the project site, the hard-wired mode was chosen; the frequency inverter was remotely controlled by the operation column; closed-loop and open-loop operation of the system could be selected by the control panel. The frequency inverter control interface and the remote operation column are shown in the following pictures:
 
INVT pv pump inverter INVT motor drive
The frequency inverter control interface
The remote operation column and measuring gauges

According to the characteristics of the on-site pump and the users’ water consumption changes, combined with the functional characteristics of the GD5000 series high-voltage frequency inverter, the PID-related parameters of the on-site frequency inverter are set as follows:

No.

Function No.

Function definition

Set range

Set value

1

P9.00

PID reference source selection

0~9

2

2

P9.01

PID keyboard preset

0.0~100.0

0

3

P9.02

PID feedback Source Selection

0~7

0

4

P9.03

PID output feature selection

0~1

0

5

P9.04

Proportional gain (Kp)

0.00~100.00

10

6

P9.05

Integration time (Ti)

0.01~10.00

10

7

P9.06

Differentiation time (Td)

0.00~10.00

0

8

P9.07

Sampling cycle (T)

0.01~100.00

0.1

9

P9.08

PID control deviation limit

0.0~100.0

0

10

P9.09

Feedback disconnection detection value

0.0~100.0%

0

11

P9.10

Feedback disconnection detection time

0.0~3600.0

1

12

P9.11

PID sleep Wake-up value

0.0~100.0

0

13

P9.12

PID delayed sleep start time

0.0~3600.0

0

14

P9.11

Acceleration time 1

0~3600.0

180

15

P9.12

Deceleration time 1

0~3600.0

180


5. Energy-saving effect
Project completed on April 5, 2010. INVT medium voltage drives were put on use on April 8, and the on-site pumps were tested for electricity power saving on April 11 - April 13. The test data are as follows:
1) Pump in 1# water supply station:

Operation mode

Test time

Reading of the electricity meter (kw/h)

Ratio of the electricity  meter

Electricity consumption (kWh)

Grid frequency

2010.4.11   8:00

73714.5

12001

11160

2010.4.12   8:00

73723.8

12001

Variable frequency

2010.4.12   10:00

73724.1

12001

8400

2010.4.13   10:00

73731.1

12001


According to the actual readings of the electricity meter and two days of electricity consumption at grid frequency and variable frequency, the energy-saving situation of the system was calculated. After frequency conversion reformation, the comprehensive energy-saving situation of 1# water supply station is:

Electricity power saved every day  =  11160 - 8400 kWh  =  2760 kWh
Energy-saving rate  = (11160 - 8400)/21720 ×100%  =  24.73%

2) Pump in 2# water supply station:

Operation mode

Test time

Reading of the electricity meter (kWh)

Ratio of the electricity  meter

Electricity consumption (kWh)

Grid frequency

2010.4.11   8:20

41514.7

12001

9360

2010.4.12   8:20

41521.5

12001

Variable frequency

2010.4.12   10:35

41521.9

12001

6840

2010.4.13   10:35

41527.6

12001


According to the actual readings of the electricity meter and two days of electricity consumption at grid frequency and variable frequency, the energy-saving situation of the system was calculated. After frequency conversion reformation, the comprehensive energy-saving situation of 2# water supply station is:

Electricity power saved every day = 9360 - 6840 kWh = 2520 kWh
Energy-saving rate = (9360 - 6840)/9360 ×100% = 26.92%

3) Pump in 3# water supply station:

Operation mode

Test time

Reading of the electricity meter (kWh)

Ratio of the electricity  meter

Electricity consumption (kWh)

Operation at power frequency

2010.4.11   8:50

14873.8

12001

5280

2010.4.12   8:50

14878.2

12001

Operation at variable frequency

2010.4.12   11:20

14878.4

12001

3720

2010.4.13   11:20

14881.5

12001


According to the actual readings of the electricity meter and two days of electricity consumption at grid frequency and variable frequency, the energy-saving situation of the system was calculated. After frequency conversion reformation, the comprehensive energy-saving situation of 3# water supply station is:

Electricity power saved every day = 5280 - 3720 kWh = 1560 kWh
Energy-saving rate = (5280 - 3720)/5280  ×100% = 29.55%

6. Advantages of Medium Voltage VFD

Aboveall, after installed INVT medium voltage drive, with advance PID Control, thewater treatment plant can improved process efficiency, and get a significantenergy saving rate, reduced maintenance cost. Details contact INVT to learnmore.

INVT VSD

References:
【1】Instructions for CH100 series high-voltage frequency inverter, Shenzhen INVT Electric, 2007;
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