frequency conversion
Study on Three-Phase Asynchronous Motor Soft-start Strategy and Soft-Starter Device Design
The smooth starting and braking of three-phase asynchronous motor is the most important factors not only to improve motor’s lifetime but also to decrease impacting effect above the power grid and linked equipments.For a long time,the researching on motor’s dragging has always been an important project among the manufacturers and electro-mechanical engineers.Firstly,this paper investigates the [...]
Research on the Cooling Systeml Based on the Variable Primary Flow in Air-conditioning Systems
The central conditioner cooling water system were made of the heat-exchange equipment,cooling water pump and cooling tower.The cooling water system would lead to waste of electrical energy and water resource due to the unreasonable design or unsuitable operation.There is big space to save energy.To reduce the central conditioner cooling water system energy consumption,this article analyze [...]
Research on the Cooling Systeml Based on the Variable Primary Flow in Air-conditioning Systems
The central conditioner cooling water system were made of the heat-exchange equipment,cooling water pump and cooling tower.The cooling water system would lead to waste of electrical energy and water resource due to the unreasonable design or unsuitable operation.There is big space to save energy.To reduce the central conditioner cooling water system energy consumption,this article analyze [...]
Research on Pressure Stabilization System of Water Flow Standard Facility Based on Frequency Conversion
The research and application of flow calibration facility are important part of the development of the flow measurement and test technology. The flow stability is an important technical parameter of the facility, which directly influences its stability and uncertainty. The thesis carried out the research of frequency control and the container stabilizing pressure system of [...]
Study on Inverter Drive Technology in the Oil Drilling Electronic Control System
Vector Control as an advanced control strategy in the electrical unified theory and mechanical energy conversion and coordinate transformation of the theory developed on the basis of ,with an advanced nature, innovative and practical features. Vector control is the idea of the model through asynchronous motor coordinate transformation, to make it a DC motor model, [...]
The Description of VRV Air-condition and Heat Recover Screw Chiller are Designed in Hotel
VRV air-condition system is consistently in order to energy conservation、The intelligentization is regulateed and exact temperature control , Whether is advantageous to VRV , That have something to do with against use target building nature and set capacity size,so on numerous elements , and dominateeing the pattern . In immediate future such as to public [...]
The Frequency Energy-saving Optimal Analysis of Circulating Water System in Steam Power Plant
The energy-saving of electric power industry is an important long-term task for the development of the national economy. Power plants from the realities of China’s current situation, energy-saving potential is great. This article mainly analyzes the performances of turbine,condenser and circulating water system, and establish the mathematical model of these systems, based on the theory [...]
The Research of Broadband Phasor Measuring Technology
On basis of absorbing and referring to the foreign and domestic the measurement of phasor technology,this paper deeply introduces the principle of the measurement of phasor, and analyzes the important problems in the design such as reach the goals of frequency conversion,design of broadband analog signal conditioning circuit,design of high-speed data acquisition,thorough exposition on the [...]
The Research on Energy Saving Programs for Auxiliary Equipment in Power Plants
Fans and pumps are widely used in power industry. Huge power is consumed by them and much energy is wasted. If the speed adjustment technology is popularization, large benefits will be achieved.In this paper, many kinds of speed adjustable technologies for High-voltage, high-power induction motor-driven fan and pumps are analyzed. According to the situation of [...]
The Research of Floating Crane Electric Control System Based on Fuzzy-Neural Network
Floating crane is a hoisting machinery which is takes by the ponton, in port construction, shipbuilding and engineering, bridge construction, underwater salvage, and various marine engineerin, floating crane are widely used. The drive system of large crane’s various organizations (main and auxiliary hoisting, luffing, slewing), does not require the speed, but the requires stable speed [...]