SVG high voltage dynamic reactive power compensation device

1.
Related knowledge
High voltage dynamic reactive power compensation device compensation is divided into two methods: system compensation and load compensation. Among them, system compensation is mainly aimed at the transmission and distribution grid, regulating the grid voltage and improving power quality. Load compensation is mainly aimed at compensating the reactive power of power user terminals and improving the user's power factor.
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The technology adopts a new generation of power electronic components, using AC and DC AC methods, plus configured phase-shifting transformers, and modern computer control technology to achieve dynamic calculation, control and compensation. The device has output harmonic The characteristics of low wave content, fast response speed and high reliability are completely different from traditional fixed capacitor compensation and thyristor controlled compensation devices.
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The product is technologically advanced and represents the latest technology in the field of reactive power compensation today. It is an important part of the flexible AC transmission system (
).
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It does not save active power per se, but by compensating reactive power, it mainly improves the power factor for user loads and reduces the huge fines that customers need to pay due to low power factor (the power rate electricity bill also increases the power The output of the equipment for the power system is mainly to reduce line losses and stabilize the grid voltage.
,
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The device adopts computer tracking technology, which can control and eliminate a large number of harmonics on the power grid, reduce the content of harmonics injected into the power grid, and meet national standard requirements.
The user's original
and fixed capacitors can also be used Depending on the future on-site technology upgrade, it will be retained or removed.
2.
Product Introduction
Our company's products adopt a reactive current detection method based on instantaneous reactive power theory. The main circuit of the transformer adopts a bridge power unit cascade topology, supplemented by small-capacity energy storage components. It synthesizes a step wave from several voltage levels to approximate the sinusoidal output voltage. This inverse Due to the increase in the number of output voltage levels of the inverter, the output waveform has a better harmonic spectrum, and the voltage stress endured by each switching device is smaller, and no voltage equalization circuit is needed, which can avoid large/
Working Principle
The basic principle is to use high-power power electronic devices that can be turned off (such as
/>) form a self-commutating bridge circuit and connect it in parallel to the power grid through a reactor. By appropriately adjusting the amplitude and phase of the AC side output voltage of the bridge circuit, or directly controlling its AC side current, the circuit can absorb or Send out reactive current that meets the requirements to achieve the purpose of dynamic reactive power compensation.
Main functions
(
) Maintain the voltage of the receiving end and enhance the system voltage stability
(
/>) Compensate system reactive power, improve power factor, reduce line loss, save energy and reduce consumption
(
) Suppress voltage fluctuations and flicker
(
) Suppress three-phase inconsistency Balanced.
Product Features
With high reliability, easy operation and high performance as the design goals, it meets the urgent need of users to improve the power factor of the distribution network.
Adopts new
Power device, fully digital microcomputer control, has the following characteristics: easy installation, setting and debugging
, real-time tracking of load changes, dynamic compensation of reactive power, improvement of system power factor
, and use of optical fiber Trigger technology realizes the electrical isolation between the primary system and the secondary system, solves the interference problem, and achieves high reliability and controllability
. The main circuit adopts
bridge power unit cascade operation. The structural form of the inverter main circuit, the output is superposed by stepped sinusoidal waveforms, with good waveform sinusoidality, modular design of the power circuit, simple maintenance, good interchangeability, and dynamic response Fast time
, real-time tracking of grid current changes, dynamic stepless compensation of grid reactive power
No transient impact during switching, no closing inrush, no arc re-ignition, no need to discharge Can be re-invested
, complete protection functions, with over-voltage, under-voltage, over-current, over-heating and other protections, high operational reliability
, low maintenance, low operating cost
, controller implementation Fully digital, friendly human-machine interface display, and has network communication function
The controller has high reliability and is easy to operate. When connecting to the system, there is no need to consider the phase sequence of the AC system, and the compensation device has complete protection measures
/>, The circuit parameters of the device are carefully designed, the heat is small, the equipment structure is compact, and it occupies a small area
. The control power supply adopts the method of supplying power to the device separately after passing
, and the control power supply is powered off. It can maintain normal operation
, improve voltage quality, stabilize system voltage, suppress voltage flicker
, can be installed in parallel, and can easily expand capacity.
Technical parameters
Rated capacity~
Rated voltage~~
System frequency
Response time
Loss
Output current

Reactive power adjustment method, capacitance and inductance are continuously adjustable
Protection level
or customized according to user needs
Application fields
The products developed by our company are widely used in petrochemical industry , metallurgy, electric power, coal, electrified railways, wind power plants and other industrial fields with or close to impact loads and large-capacity motors, which can save energy and reduce consumption, improve grid security and stability, increase grid power factor, and improve power quality. , plays an important role.
3.
On-site cases of product application
,/
The reactive power compensation device is operating stably in the Xiejiaji No. 1 Coal Mine, Huainan City, Anhui Province.
,/
Dynamic reactive power compensation has been successfully applied in the Tashan and Guanqiao substations of Sichuan Hydropower Investment and Operation Group Yongan Electric Power Co., Ltd.
After the above-mentioned units installed the company's reactive power compensation device, it not only improved the power factor of the power grid from below to above, but also solved the problem of overcompensation of the existing capacitor compensation device, effectively Reducing line losses, improving power grid quality, and saving electricity bills for users has very significant social and economic benefits.