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  • Wanlida Dynamic Reactive Power Compensator - China

    price: contact company for price

    Application industrial fields

    Rolling Mill

    The big reactive impulsion caused by rolling mills and other

    industrial symmetric loads may lead to the following

    problems to the power grid:

    The voltage drop and fluctuation, which may result in

    malfunction of electric equipment and reduce the productive


    Low power factor

    The harmful high-order harmonic waves in the driving

    devices, typically 5th, 7th, 11th, 13th and side-

    frequencies, which will cause serious voltage distortion.

    Electric Arc Furnace (EAF) and Ladle Furnace

    The electric arc furnace and ladle furnace are typical non-

    linear and erratic loads in the power grid, causing a series

    of adverse effects to the power grid:

    Result in serious three-phase unbalance of the power grid,

    and cause negative-sequence currents.

    Produce high order harmonics, such as coexist of 2nd, 4th

    even harmonics and 3rd, 5th, 7th odd harmonic, which make

    severe voltage distortion become more complicated.

    Serious voltage flickers

    Electric Railway Traction Substation

    While protecting the environment, the electric locomotive

    also causes serious pollution to the power grid. As the

    electric locomotive is powered by single phase power system,

    which not only causes serious three-phase unbalance and low

    power factor but also generates negative-sequence currents.

    Currently, the only way to solve the problem is to install

    SVC system at appropriate locations along the railway. The

    SVC is able to balance the three-phase by means of single-

    phase compensating and to increase the power factor through

    filter capacitor. Wanlida’s SVC is capable of solving this

    problem perfectly at minimum cost.

    Hoists and Other Heavy Industrial Loads

    The hoists and other heavy industrial loads may cause the

    following effects to the power grid when they are at working


    Cause the voltage drop and voltage fluctuation in the power


    The harmful high-order harmonic currents

    Wanlida’s SVC can solve above problems perfectly and help

    customers obtain the following benefits:

    Increase the power factor by dynamic reactive power


    Eliminate the voltage distortion caused by harmonic

    Stabilize the voltage and reduce the voltage fluctuation and


    Balance the three-phase load current and eliminate the

    negative sequence current

    Increase the operation safety of impact loading equipment

    and its adjacent electrical equipment

    Long Distance Power Transmission

    The power grid tends to have larger capacity and longer

    distance, in the case of long-distance AC transmission, due

    to the influence of Ferranti Effect, the voltage in the

    middle of transmission lines will rise which will limit the

    transferred power. The capacitive power along the long

    distance power transmission lines is in proportion to the

    cable length and the square of voltage, so it will be

    terribly surprising for capacitive current power to ground,

    which results in the voltage rising of 1.5 to 2 times of

    rated voltage at the end of transmission line and then

    causes badly result. The power utility usually install shunt

    reactor to compensate capacitive current to ground to solve

    voltage rising at the end of transmission lines, but if the

    shunt reactor is of fixed capacity, it will be removed from

    compensation system once inductive current is over desired

    capacitive current to ground. As usual, the operation of

    shunt reactor connected in parallel to transmission line

    wants a very high demand for switch, but until now, it is

    still very difficulty to solve the over-voltage surge caused

    by reclosing of switch, as a result, it results in bad over-

    voltage accidents. However, the SVC of MCR type of Wanlida

    can solve those problems; it can regulate reactive power of

    transmission line dynamically and fast. The SVC of TCR can

    not be directly installed in transmission lines with over

    35KV, but the SVC of MCR can be installed in extra-high

    voltage and ultra-high voltage transmission lines directly,

    and it has no need of action of switching. So the SVC of MCR

    type is able to improve transmission and distribution

    performance of the power system remarkably. It should be

    installed at one or several proper points in the power grid

    in order to maintain a balanced voltage under different

    conditions and achieve the following purposes:

    Stabilize voltage of a weak system

    Reduce the transmission losses

    Enhance transmission capability and make existing power grid

    more efficient

    Improve transient stability

    Increase the resistance in the small interference

    Improve system damping

    Enhance the voltage control and stability

    Restrain the power oscillation and the sub-synchronous


    Wind Power Plant

    The output power of generator is always fluctuated

    frequently because of variable wind power. At present, the

    popular asynchronous wind generator (including Doubly-Fed

    Type) needs to absorb parts of inductive reactive power to

    build magnetic fields, the paralleled capacitor banks can

    realize compensation, but the stepped switching capacitor

    banks can not meet fast and dynamic reactive power

    compensation demand caused by variable wind power,

    sometimes, if the capacitor banks can not meet reactive

    power compensation in time, the wind generator will absorb

    reactive power from the upper power grid, which will result

    in low power factor of upper power grid and then cause

    voltage fluctuation, so the state grid put forward the <

    Regulations on State Grid Corporation Wind Farm Grid Access

    Technology (Amendment)> based on voltage fluctuation,

    flicker, frequency deviation, harmonics and lacking reactive


    The SVC of MCR can solve the above problems to meet the

    demand of utility.

    Secondary Substation (66KV to 110 kV)

    In the regional power grid, the stepped switching capacitor

    banks are used to compensate the system reactive power and

    increase the power factor. But they are only able to provide

    the capacitive reactive power, and unable to realize rapid

    and accurate adjustment according to the load variation, so

    sometimes they provide much more reactive power than the

    actual desired reactive power, which will result in over

    voltage of the bus bar and damage the electric equipment and

    destroy system stability.

    Because the SVC of TCR can not be directly installed in

    subtransmission lines with over 35KV, Wanlida’s SVC of MCR

    will be most suitable for subtransmission, Wanlida’s SVC

    system is able to compensate with capacitive and inductive

    reactive power rapidly and accurately. It solves the

    problems of reactive feedback effectively. In addition, when

    a new SVC system is installed, the existing fixed capacitor

    banks can be utilized by adding a MCR, which requires the

    minimum investment. It is the most effective way to improve

    the power quality of the local power grid, the detail

    benefits is as below:

    Reduce the reactive power exchange with system and improve

    system stability

    Rapidly and continuously compensate the reactive power,

    increase the power factor and improve the power quality.

    Reduce the power losses of distribution system

    Used in combination of stepped switching capacitor banks to

    reduce the damage caused by frequent switching of capacitor


    Company Contact:

    • Phone: 867563395623

    • Address: Wanlida Relay Protection Industrial Park, No. 1 Te, Zhuhai, China

    • Email: Email

    Published date: August 22, 2013 -

    • Business Description: Incorporated in 1991, Zhuhai Wanlida Electric Co., Ltd. (www.zhwld.com)

      ('the Company'), is located in Relay Protection Industrial Park, No.1

      Technology Road, Science and Technology Innovation Coast, High tech

      Zone, Zhuhai City, coving a land area of approximately 60 thousand

      square meters (including Park 1 and Park2). The Company was listed for

      equity financing on November 13, 2007 (equity securities abbreviated as:

      Wanlida stock certificates, code: 002180), with a registered capital of

      124,980,000 Yuan. The Company keeps on her aggressive 'production,

      study, research and application' co operation with the famous academies

      such as Tsinghua University, Chinese Academy of Sciences and Central

      China University of Science and Technology and carries out relevant

      technology innovation. It is a national high tech enterprise that deals

      with specialized development, production and sales of substation

      integrated automation systems and Medium voltage variable frequency

      drives, Medium voltage magnetically controlled soft starters, Static

      synchronous compensator(STATCOM/SVG), Static VAR compensator(SVC),

      Active power filter(APF/AHF), Thyristor switched capacitor bank

      (TSC/TSF), High voltage direct current light transmission systems etc

      power electronic equipments. In addition, the Company is known as a

      famous manufacturer and backbone enterprise of transformer substation

      integrated automation and power electronic equipments fields in China,

      and it also acts as fresh blood in the field of energy conservation and

      emission reduction.

      Wanlida passed the ISO9001 quality system certification, ISO14001 Environment Management System Certification and OHSMS18001 Occupation Health &Safety Management System Certification; All products passed the test of sated authoritative inspection bureau. And it had been rated as 'National High and New Technology Enterprise', 'Enterprise Recommended by State Economic and Trade Commission for Reconstruction of Urban and Rural Electric Grids', 'Key Software Enterprise Covered by National Program', 'Excellent enterprise of China', 'First choice Manufacturer for Electric Framework Protocol Sponsored by CNPC', 'Excellent Enterprise of Guangdong Province', 'Optimum Good faith Enterprise of Guangdong Province', 'Contract honoring Enterprise of Guangdong Province', 'Top 10 Private Enterprises of Zhuhai City', and 'Enterprise with Grade AAA Bank Credit '.

      Wanlida has a very strong R&D teamwork which has a population of over 100 with doctor's degree, postgraduate degree and bachelor's degree etc, and all of the products are designed strictly according to IEC standards; Wanlida has modern standard workshops, it brought advanced SMT production lines and wave soldering machines into company from abroad, and built the first class high voltage and big capacity power electronic equipments assembling and test platform, which is able to realize full load test and ensure that all of products have exquisite technics and reliable quality; At present, Wanlida covers all of domestic areas except Hongkong, Macau and Taiwan, and it also sells the products to Southeast Asia, Middle East, South America, Africa etc over 20 countries.

      The Company aims to grow into the most dedicated electric automation enterprise in the world, and commits itself to building the aircraft carrier of power electronic energy efficiency products.

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