Tag:frequency regulation

№5|2012

WATER AND WASTEWATER COMPANIES (VODOKANALS) IN RUSSIA

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UDC 628.1:658.26.004.18

Moiseev A. V., Riffel E. V., Furmanova Yu. I., Syryakov V. V., Mazepo M. V.

Introduction of energy saving measures in Krasnodar Vodokanal

Summary

The aspects of efficient energy consumption by water and wastewater utilities are of primary importance. In order to reduce the energy consumption constituent of the production costs certain energy saving measures are introduced aiming to the development and improvement of the process technologies, upgrade of equipment and controls. This approach is provided by the development of market relations, deficiency of energy resources and, consequently, by the energy price increase. The energy consumption pattern of an enterprise is determined by the type of products manufactured or services rendered. The principle procedure of an energy audit of the pumping stations operated by Kransnodar Vodokanal; the basic technical solutions on the water supply upgrade are presented alongside with the comparison of the calculated and actual cost savings resulted from the introduction of the energy saving measures.

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№7|2018

ENERGY CONSERVATION

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UDC 621.65:62-531.3

Usachev A. P.

Method of estimating the efficiency of pumping unit frequency regulation (to be discussed)

Summary

The method of estimating energy saving from using frequency regulation of the pumping unit capacity in water supply systems is presented. The estimation of the capacity efficiency of pumping units is carried out only from the energy saving resulting from the use of frequency regulation instead of throttling (other saving components are not considered). To estimate energy saving it is required to compare the power consumed from the grid in the existing scheme of the regulation by penstock gate throttling and in the frequency regulation scheme. Then the energy saving in monetary form shall be compared with the expenses for retrofitting the frequency regulation system. The method is based on the graphical analysis of the pump operation point parameters in the operating group and optimized for the use in water supply systems operating by the pressure.

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№4|2014

ЭНЕРГОРЕСУРСОСБЕРЕЖЕНИЕ

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УДК 621.65:62-531.3:628.1/.2

Bagaev Yu. G., Karpov N. V., Usachev A. P.

Specific features of frequency regulation of parallel pumps

Summary

One of the options of energy efficient operation of pumping units at the water and sewage pumping stations under pump impeller speed variation with the help of variable-speed electric drives widely used at present time is considered. One variable-speed electric drive is installed either for a group of operating units or on a single pump. Installing a variable-speed electric drive on each operating unit at first sight seems to be a very expensive measure; therefore more often one electric drive is installed for a group of pumps (2–3 units). However, in this case cavitation processes can arise, the dynamic loa­ding on the pump shaft and bearings can increase, the lifting efficiency can decrease, and in the long run the pump energy efficiency can drop. The data of the theoretic and practical substantiation show that installing variable-speed electric drives on each operating pumping unit provides for weakening of the above-mentioned shortcomings, whereas the energy efficiency improves.

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№2|2018

ENERGY CONSERVATION

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UDC 628.1.2:658.26.004.18

Usachev A. P.

Control of centrifugal pump parallel operation

Summary

The problems related to the cable capacity of pumping units during their parallel operation (one with variable-frequency control, another one – without variable-frequency control) are considered. In the traditional control schemes (without variable-frequency control) the problem is solved by throttling of each pump with cable capacity levelling of their drive motors. This function is usually carried out by the operator in manual mode. Based on the conducted analysis an algorithm of pump control was developed that provided for their safe operation in the working area and maximum energy efficiency. It is proposed to carry out controlled throttling of the pump without variable-frequency control by controlling the position of the set point of the pump with variable-frequency control at the working area interface. To ensure failure-free operation of the pumping station in case of the pump with variable-frequency control emergency shutdown it is recommended to change the system of the pump without variable-frequency control for automated pressure maintaining with the help of throttling. To implement the given algorithm the use of a special process controller with the sufficient computing power (STK 500 type) and series SP 200 blocks is proposed.

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vstmag engfree 200x100 2

mvkniipr ru

Российская ассоциация водоснабжения и водоотведения

Конференция итог

ecw20 200 300

VAK2