Valve-controlled variable frequency pumping energy storage group
There is no one-size-fits-all control strategy in variable speed pumping
White Paper There is no one-size-fits-all control strategy in variable speed pumping Sensored and sensorless control are among the options to satisfy ASHRAE 90.1 An increasing emphasis on variable speed pumping as a means to save energy in commercial
Energy Performance Analysis of an Integrated …
In a district cooling system (DCS), the distribution system (i.e., cooling water system or chilled water system) will continue to be a critical consideration because it substantially contributes to the total …
Coordinated Control of Doubly Fed Variable Speed Pumped …
The combination of doubly fed variable speed pumped storage (DFVSPS) and flywheel energy storage (FES) can make full use of different technical advantages of different types of energy storage, and participate in frequency regulation …
Pump control vs valve control: Efficiency or performance?
Valves can reach into the 150 to 200 Hz frequency responses, whereas the fastest pump frequency response is a small fraction of that. Hopefully, pumps will be developed one day with bandwidths of 50 or 80 Hz, or maybe even higher, making them suitable for many applications that are currently controlled by servo and proportional …
The Use of Variable Frequency Drives of Centrifugal Pumps atthe Pumping …
The article describes the method of calculating unsteady loads on the rotors of oil main pumps, based on the use of CFD-modeling methods. The limiting values of pressures in the ...
14 energy-efficiency improvement opportunities in pumping …
10. Avoiding throttling valves Variable speed drives or on-off regulated systems always save energy compared to throttling valves. The use of these valves should therefore be avoided. Extensive use of throttling valves …
Application of variable frequency drive on the condensate pump …
Generally, Variable Frequency Drives (VFDs) allow to operate motors and pumps at the precise speed needed for the process and energy saving. This paper investigates if there are any advantages when VFD is used to control the CPs and check …
HVAC Hydronic System: Controlling Parallel Variable Speed Pumps …
Using variable speed drives with advanced pumping controls allows the engineer to couple the best pump selection with energy saving parallel pumping. Parallel Pump Selection and End of Curve Concerns In part 2 of the series I …
Coordinated Control of Doubly Fed Variable Speed Pumped Storage and Flywheel Energy Storage Participating in Frequency …
The combination of doubly fed variable speed pumped storage (DFVSPS) and flywheel energy storage (FES) can make full use of different technical advantages of different types of energy storage, and participate in frequency regulation in the whole stage of grid frequency fluctuation. ...
Variable-Speed Pumping
Significant opportunities to reduce pumping-system energy consumption exist, the most popular being through the application of variable-frequency drives (VFDs). 1 This article will explain why VFDs and their cousins—electronically commutated motors (ECMs)—are a valid and cost-effective means of varying pump speed and identify many …
Research on the Key Technologies of Control and Protection for …
This paper introduces in detail the control structure of the static frequency converter (SFC) valve group of pumped storage unit and the key technology of control and protection of thyristors. It has solved the technical problems such as wide bandwidth pressure energy …
Research on the Key Technologies of Control and Protection for Static Frequency Converter (SFC) Valve Group of Pumped Storage …
Research on the Key Technologies of Control and Protection for Static Frequency Converter (SFC) Valve Group of Pumped Storage Units Xu Hao1,2, Zhang Xuejun1,2(B), Ma Jiayuan1,2, Tian Anmin1,2, Liang Shuaiqi1,2, and Wang Jiayu1,2 1 State Grid Electric Power Research Institute Co. Ltd., Nanjing 211006, China ...
Pump Pros Know: Variable Frequency Drives
This is done by modulating the frequency of the electrical power supplied to the motor. Also called adjustable frequency drives (AFD), variable speed drives (VSD), AC drives, and inverters, VFDs are best applied in …
A review of beam pumping energy-saving technologies
The beam pumping units applied in oilfield for more than 150 years, because it had the advantages of simple structure, reliable and durable. At present, it is still one of the most important artificial lift methods in the world. Due to the inherent structure of the beam pumping units, the balanced torque curve of gearbox has a bigger fluctuation …
The benefits of Variable Frequency Drives for pump applications
Why Variable Frequency Drives are the most efficient method of controlling flow If we look at the storage tank example mentioned earlier, by replacing a centrifugal pump''s motor starter with an appropriate VFD, the high and low limit float switches can be removed from the tank and replaced with a suitable level sensing transducer system.
Research on the Key Technologies of Control and Protection for …
At present, SFC is the main starting mode of pumped storage unit. SFC can pro-duce frequency variable AC power to start the pumped storage unit, with soft starting function. This paper introduces in detail the control structure of the static frequency converter
Pumped energy storage system technology and its …
This study presents state-of-the-art pumped energy storage system technology and its AC–DC interface topology, modelling, …
Provision of primary frequency control with variable-speed …
Pumped-storage hydropower (PSH) is the most established and mature energy storage technology, but recent developments in power electronics have created a renewed interest by providing PSH units with a variable-speed feature, thereby increasing their
Energy Savings with Variable Frequency Drives in Pump Applications
In the U.S. industrial sector, motor-driven systems consume 70 percent of all electricity. Motor-driven pumps account for more than 30 percent of that amount-more than any other application. Considering energy and maintenance represent more than 80 percent of total motor life cycle costs, a growing number of system designers, specifying …
Reducing Life Cycle Costs in Pumping Applications with Variable Frequency Drives …
A variable frequency drive (VFD) can be a valuable asset in reducing the life cycle costs in certain types of pumping applications. The traditional method of motor control in pumping applications is a low cost mechanical starter, which is essentially a large switch with a built-in motor protection device known as a thermal overload relay. A …
Variable Frequency Starting Strategy for Pumped Storage Unit …
A topology of a variable frequency starting and flexible excitation multiplexing system for pumped storage units was proposed in this paper. Then, a variable frequency starting control strategy was studied. Finally, simulations have been conducted, and verified the
Energy Performance Analysis of an Integrated Distributed Variable-Frequency Pump and Water Storage …
Keywords: district cooling; distributed variable-frequency pumps; water storage; cooling water; energy saving 1. Introduction District cooling systems (DCSs), which generate cold water in a central plant that is distributed to end uses to fulfill its cooling demands
Energy Conservation Using Variable Frequency Drive in Pumping …
Pumping systems account for nearly 20% of the world''s electrical energy demand and range from 25-50% of the energy usage in certain industrial plant operations(1).Pumping systems consume a significant portion of the electricity, Variable frequency drives (VFD''s) are often recommended as a way to save pumping energy. Actual energy savings will …
Flow Control with VFD Pumps versus Control Valves
A recent ControlGlobal article explored the energy savings of variable frequency drive (VFD)-based centrifugal pumps versus control valves in flow control applications. The article, Eliminating the Control Valve sums its position in the subtitle, "Valves Are Energy Hogs; They Stick; They''re Prone to Mechanical Failure. So Why the …
Comprehensive Performance Evaluation Of Frequency Control Of …
Comprehensive Performance Evaluation Of Frequency Control Of Pumped Storage Units Based On Actual Operating Data Analysis. Abstract: As the "regulator" of the power system, the pumped storage power station has the advantages of flexible working …
The essentials of pumping, pump speed and flow rate …
Using variable speed control (Figure 14d), P = 7 × 6.4 = 44.8 ≈ 45 kW. It can be seen that variable speed control is the most effective method! Suggested Course – Practical Course to Wiring and …
VFD versus Control Valve for pump flow controls
The above only considers normal process operations. The minimum flow for the variable frequency drive will be lower than that for the constant speed VFD but won''t be zero. There are always startup issues to be addressed …
Energy-efficient control strategy for variable speed-driven parallel pumping …
The article aims to find a solution for the energy efficiency improvements in variable speed-controlled parallel pumping systems with lesser initial data and without additional flow metering and start-up measurements. This paper introduces a new control strategy for variable speed-controlled parallel pumps based on flow rate estimation and …
Energy-saving mechanism research on beam-pumping unit …
B. Hydraulic drive pumping unit model Compared with the conventional beam pumping unit, the 3d models are shown in Figs 2 and 3 can be clearly seen from Figs 2 and 3 that the cylinder body, crank, balance weight, belt drive, brake mechanism and other intermediate transmission parts on the pumping unit are removed, and box balance …
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