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Nov 23,2019
var The unit of measurement for reactive power. Active power (P) Active power is the useful power that does the actual work. Active power is measured in W, kW, MW. Reactive power (Q) Reactive power is a product of an AC system. Reactive power is used to produce magnetic fields. Reactive power is mea- sured in var, kvar, Mvar. Apparent power (S) Apparent power or total power is a combination of act...
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Nov 23,2019
Fundamental (component) The component of order 1 of the Fourier series of a periodic quantity. (IEV 161-02-17) Harmonic The component of the Fourier-series decomposition of a volt- age or current periodic wave. (IEV 161-02-18 modified) Harmonic order (h) The ratio of the frequency of a harmonic (fh) to the fundamen- tal (rated) network frequency (f1). (IEV 161-02-19 modified) Odd harmonics Harmoni...
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Nov 29,2019
Industry background Chemical industry involves many mechanical processes with demanding quality requirements. Before any mechanical smelting, casting, or stamping, an induction melting furnace is used to melt metal. Most induction melting furnaces use a 6-pulse or 12-pulse rectifier, which produces high volumes of harmonic and reactive power. As a result, the production efficiency of induction mel...
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Dec 05,2019
Typical non-linear loads We will be focusing on the six pulse rectifier bridge. The 3 phase rectifier has a key role to play because a significant portion of the electrical energy is drawn from loads with this type of front-end circuit. One typical application that can be mentioned is the variable speed motor drive, which has been used for years with high growth rates in almost every industrial se...
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Dec 07,2019
Active Harmonic Filter Active Harmonic Filter has many potential applications where its use can offer plenty of benefits. Active Harmonic Filters have been proven to provide lowered disturbances, lower carbon dioxide emissions through improved energy efficiency, lower current consumption and increased production stability to name a few. Just as other technology has evolved, so have various product...
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Dec 18,2019
Single busbar compensation Overview An installation with a single LV busbar is that most often encountered. This type of installation requires that the reactive power can change with respect to the methods defined previously. Compensation uses all the receiving devices of the installation and the amperage of the current transformer is determined according to the total current conducted through the...
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Dec 23,2019
The Graph below shows Harmonic Current Distortion in the form of THDi. This is hovering between 20 and 25%. Ideally, it should be less than 10% and preferably less than 8% THDi. The highest value of average total harmonic distortion (THDi%) across three phases was calculated from raw data. This value is 24.19%THDi and was recorded at time shown. At the same time, average line current (Amps) across...
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Dec 25,2019
We make a simple introduction about harmoincs in networks,welcome to communicate with us about harmonics and how to solve. General Introduction Harmonics are usually defined by two main characteristics: Their amplitude: value of the harmonic voltage or current. Their order: value of their frequency with respect to the fundamental frequency (50 Hz). Under such conditions, the frequency of a 5th ord...
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Dec 28,2019
Reactive power is necessary to generate magnetic fields, e.g. in motors, transformers and generators. This power oscillates between the source and the load and represents an additional loading. Static var Compensator (SVC) and static var generator can suppress the voltage fluctuation, flicker and rapidly compensate the reactive power and the quality of electric power can be improved. If you have q...
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Jan 02,2020
The effects of harmonics on loads The following two types of effects appear in the main equipment: immediate or short-term effects and long-term effects. Immediate or short-term effects: Unwanted tripping of protection devices, Induced interference from LV current systems (remote control, telecommunications), Abnormal vibrations and noise, Damage due to capacitor thermal overload, Faulty operation...
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Jan 07,2020
Part 1:Principle of reactive energy management All AC electrical networks consume two types of power: active power (kW) and reactive power (kVAr): The active power P (in kW) is the real power transmitted to loads such as motors,lamps, heaters, computers, etc. The electrical active power is transformed into mechanical power, heat or light. The reactive power Q (in kVAr) is used only to power the ma...
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Jan 13,2020
Abstract: The application of SVG/STATCOM, a high voltage dynamic reactive power compensation device, produced by ZDDQ Electric Co., Ltd. is described in this paper. Its role in reactive power compensation for new energy construction is analyzed and its applications in electric and electronic fields are indicated. Key words: SVG;STATCOM; Photovoltaic station; Reactive power compensation; Applicatio...
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Jan 16,2020
There are a couple of principles to achieve reactive power compensation. The simplest solution is without any doubts a combination of switched passive elements, i.e. switched capacitors and inductors. Figure 1 shows qualitatively the reactive current versus connected voltage of such a solution. The reactive current depends linearly on the grid voltage and as a consequence the reactive power change...
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Jan 19,2020
A changing electrical network brings new power quality issues. Today the way we generate, use, and control our energy is changing. New and renewable generation and distribution technology is becoming common, and combined with more dynamic and complex load profiles, there are more challenges faced by the network and energy users to provide high power quality. A new way to improve your power quality...
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Feb 01,2020
To our clients, You may have had some good memories about the past one, but you never know what’s the new one is bringing for you. It's time to be hopeful, have new dreams and make some new resolutions for the new year in your life. It's time to connect with each other and make new year wishes. Its time to move on and embrace what’s new. New year means a lot of new dreams and new achievements. Peo...
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Feb 04,2020
Industry background Chemical industry involves many mechanical processes with demanding quality requirements. Before any mechanical smelting, casting, or stamping, an induction melting furnace is used to melt metal. Most induction melting furnaces use a 6-pulse or 12-pulse rectifier, which produces high volumes of harmonic and reactive power. As a result, the production efficiency of induction mel...
read more
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Feb 21,2020
Medium Voltage STATCOM-Dynamic Reactive Compensation -----Providing stability, security, and reliability to the grid Installing a STATCOM at one or more suitable points on the network is a powerful and cost effective method to increase grid transfercapability and enhance voltage stability. What is a STATCOM? A STATCOM (or Static Synchronous Compensator) is a voltage regulating device. It is based ...
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Feb 25,2020
ZDDQ has come back to factory and start to work Since Feb.18th. The factory will carry out the strict measures to maintain the normal production to meet clients' orders. In 2020, we will focus on low voltage and medium voltage power qualit improvement and power factor correction. In low voltage field, we will push on R&D of Active power filter, and provide perfect service for clients.We have b...
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