STATCOM

Keeps power factor close to 1.0
Response time is less than 1ms
Up to 35kv power distribution system
Reactive power range up to ±600 MVAr

Static Synchronous Compensator STATCOM

Static Synchronous Compensator STATCOM is connected parallel in power grid and works as reactive current source. Its reactive current can be flexibly controlled and compensate reactive power for system automatically. It solves problem of harmonics interfere switching parallel capacitor banks. In another hand, it can restrain harmonics and improve power quality according to customers’ needs. STATCOM has superior performance in lots of aspect such as responding speed, stabilize voltage of power grid, reduce system power loss and harmonics, increase both transmission capacity and limit for transient voltage.

Restrain voltage fluctuation and flicker
Constant current, effectively restrain voltage drop
Provides continuous real time dynamic compensation
Compensate negative sequence, implement balanced power supply
Resistance to harmonics, able to compensate the part of harmonic current

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Overview

STATCOM as know as Static Var Compensator or Static Synchronous Compensator(European and American names).

It is the most advanced dynamic reactive compensation technology that STATCOM is used. Because of STATCOM using the most mature of the voltage source converter technology,reactive power compensation device achieves a qualitative leap. Reactive power compensation don’t use large capacity capacitor or inductance device, but use the high frequency switch of power electronic devices to achieve reactive energy conversion.

STATCOM and takes IGBT as the core of reactive power compensation system. It can provide rapid succession capacitive or inductive reactive power to achieve the assessment point of constant reactive power compensation, constant voltage and constant power factor controlling etc. which make ensure that power system is stability, high efficiency, high-quality operation. In the distribution network, the small capacity of STATCOM products are installed in some special loads (such as electric arc furnace), which can significantly improve the power quality of PCC, such as, improving power factor, overcoming phase imbalance, eliminating voltage flicker and voltage fluctuations, suppressing harmonic pollution and so on.

STATCOM main role is improving grid stability, increasing transmission capacity, eliminating the impact of reactive power, suppressing harmonic, balancing three-phase grid voltage, reducing losses and energy conservation. The device connects to grid with reactor through adjusting the bridge converter circuit output voltage of the phase and amplitude or output currents to meet the requirements of absorbing or emitting reactive power, so that it can achieve dynamic reactive power compensation purposes.

Features-benefits

Compact structure, small floor area.
Modular design, easy to install, debug and set
Fast dynamic response, response time ≤5ms
Redundant design to meet the needs of high reliability system.
Modular design of power circuit, easy maintenance and good interchangeability.
Suppressing voltage flicker, improving voltage quality, stabling the system voltage
Under the sufficient compensation capacity, output current harmonics(THD)≤3%
Easy connection, without regard to the phase sequence when connecting to the system
Elaborate design of circuit parameters, small heat value, high efficiency, low operating cost
No transient impact, no inrush phenomenon, no arc reignition, switch directly without discharge
Tracking load changes actually, compensating reactive power dynamically and smoothly, improving power factor, actually compensating harmonics, compensate the negative sequence of current, improving power quality.
Lots of protections, such as over-voltage, under-voltage, over-current, over-heating of power cell and voltage sharing. It can record fault waveform instantly so it is easy to determine the fault point and maintain, and high reliability.
Main circuit is composed of power cell, and the power cell is composed of H-bridge IGBT.Each phase is composed of multiple identical power cell, which is in series each other. The output PWM waveform is formed by step wave which is approximate to sine.

Applications

It has a lot of benefits by using STATCOM, such as, enhancing power transmission capacity, reducing power consumption, compensating reactive power, controlling harmonic, suppressing flicker, stabilizing the grid voltage, balancing three-phase system, altering the damping characteristics of the system, improving system stability, so its applications is very wide.

STATCOM products can be widely used in many industries, for example, petrochemical, power systems, metallurgy, electric railway, urban construction, etc. It can provide high quality and high reliability reactive power compensation solutions for many devices, such as, various asynchronous motors, transformers, thyristor converters, frequency converters, induction furnace, electric arc furnaces, lighting, electric locomotive, hoists, cranes, stamping machines, wind generators, welding machines, rolling machines, resistance furnace, quartz melting furnace, etc.

Petroleum, chemical, mining, docks, heavy industry:Stabling power supply voltage, Providing centralized compensation.
Iron and steel, metallurgy industry: Improving power factor to reduce the reactive power loss, Increasing productivity.
Urban distribution network and rural power supply: Solving voltage fluctuations and flicker caused by wavy load, Stabilizing voltage of end power receiving.
New energy access: Controlling access point reactive power generated by wind power, photovoltaic power generation equipment
Electrified railway and urban rail transit industry: Compensating the reactive power and harmonic of traction power supply system comprehensively, improving power quality, increasing towing capacity and saving energy.

Specifications

Items	Technical parameter
Rated voltage	35kv
Rated capacity	±8~±100mvar
Response time	≤5ms
Operating temperature	-20℃~+40℃
Efficient	≥99.2%
Total harmonic distortion rate thd	≤3%
Altitude	<2000m

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Working principle of STATCOM

STATCOM products is the self-commutated bridge circuit via a transformer or reactor connected to the power line. By appropriately adjusting the AC side of the bridge circuit output voltage amplitude and phase, or directly controlling the AC side current to absorb or issue meeting requirements reactive current, thereby, dynamic reactive power compensation is achieved.

STATCOM adopt advanced instantaneous reactive power theory and power decoupling algorithm as the theory foundation, and adopt many technologies such as modern power electronics, automation, microelectronics and network communication. It can set reactive power nature and size, power factor and grid voltage as the control target.Through tracking power quality dynamically,reactive power output are adjusted. It can run at setting curve.

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STATCOM

Static Synchronous Compensator STATCOM

Working principle of STATCOM

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