Static Var Generator
SVG (Static Var Generator, dynamic reactive power compensation
device) is a kind of modern reactive power compensation device
using self-commutated circuit, which is the latest technologies in
the field of the reactive power compensation device). Our company’s SVG dynamic reactive power compensation device has more
advantages in response speed, stable voltage, reducing power loss,
increasing the transmission capacity, improving transient voltage
limit,reducing harmonic and reducing the area etc.
SVG dynamic reactive power compensation device’s design is relying
on our company’s strong technical force, gives full play to the
advanced technology in the power industry&experience advantage
in production of our company, and makes full use of the full range
of research, design, manufacturing and testing capability. Our
company has close academic ties and technical cooperation with the
well-known research institutions and electric companies at home and
abroad, and with advanced techonogy and quality products, we are
willing to work with the users to improve the quality of electric
energy and make contribution in energy saving and safe production
of power generation.
SVG technology characteristic:
The trigger, monitoring unit phase independent design, high running
speed, strong interference resistance;
Reactive power detection technique based on the instantaneous
reactive power theory;
The DC voltage balance control;
The perfect protection function;
The dedicated IGBT driver circuit, ensure the reliability of IGBT
high frequency switching, and realtime upload the state monitoring
information to the upper monitoring system;
Link obtain energy from itself and high reliability;
The chain structure of modular design, can meet the high
reliability of the system , convenient to maintain;
The application of laminated bus bar, can meet the IGBT’s high
frequency trigger request;
The response time is up to 5ms;
It can provide continuous, smooth, fast, dynamic reactive power
compensation from the perceptual to capacitive;
It can solve the problem of load unbalance;
Has the current source characteristics, output reactive current is
not affected by the bus voltage;
Not sensitive to the impedance parameter of the system.
Static Var Compensator (Thyristor Controlled Reactor)
SVC device is mainly composed of TCR and FC. And its composition is
shown in Figure 1.FC circuit takes account of filtering and
provides a stable capacitive reactive power QFC.TCR circuit changes
inductive reactive QTCR of phased reactor output by controlling
thyristor triggering angle α. Fig.2 shows the relationship between
triggering angleαand reactor basic wave current. Inductive reactive
offsetting with capacitive reactive, as long as system reactive
Q=Qload(load need)-QFC+QTCR ≈ 0 or constant can be done, thus it
can be achieved that power network power factor equals with
constant and voltage hardly fluctuates. Due to high speed of
regulator dynamic response(less than 10ms), reactive power dynamic
compensation can be achieved. Especially for 3 phases AC arc
furnace load. That can restrain the voltage fluctuation and
flickering to the minimum level. Meanwhile it has split-phase
adjustment, it can balance the load of 3 phases AC arc furnace and
other devices, and also restrain negative sequence component of
power network to the minimum level.
TK-SVC(MCR)Static Var Compensator (Magnetic-valve Controllable
Reactor)
The main advantages of MCR-SVC
1,The power supply mode with high reliability, free of maintenance,
and the service life is not less than 20 years. It is preferred in
electrified railway and other important systems.
2, Can be directly run in any voltage level power grid (6-500 kv)
and the installation is simple(and similar to general
transformer)with convenient debugging;
3, Reactive power compensation capacity has the stepless
adjustment, making compensation achieve the best effect.
MCR-SVC composition and technical characteristics
MCR-type SVC device is composed of MCR, excitation system, filter
capacitor bank and control&monitor system.MCR is made of
high-quality silicon sheet and varnished wire with low temperature
design and high reliability, which can normally operate for 20
years. Regular inspection can make sure of stable operation for a
long time with small working, easy main-tenance and low cost. The
body is oil-immersed reactor. Outdoor installed. Foundation
construction cost is small.
Working voltage of excitation system is very low and about 1%of MCR
power and electronics elements are high-quality exported
low-voltage ones. All guarantees excitement system reliable and
safe. Triggering system of electronics elements is in light trigger
method and better isolation is between main circuit and control
circuit with super interference proof ability. All those promise
higher reliability of excitation system.
Digit control system occupies features of short response time and
higher reliability. Friendly human-to-machine interface is
available between control system and excitation system, easy for
customers to use and repair. The control system can performance
centralized monitor of analogue quantity and switching value so
that customers can monitor a relative data and realize remote
operation on SVC installation through control system. The control
system adopts RS485communication, which can be easily connected to
existing automation system. One panel and branch panels of MCR-type
SVC installation should be installed indoors and others outdoors.
Natural cooling design is applied to all outdoor equipments. In
all, the system is simple and reliable, easy maintenance and little
maintenance work.
TK-SVC(TSC)Static Var Compensator (Thyristor Switched Reactor)
HV TSC dynamic reactive power compensation installation consists of
control system, triggering system, thyristor monitoring system,
impulse transformer, capacitor, and reactor and protection
components. Control system measures real-time reactive power and
power factor, auto adjusting switching number of capacitor branch
and controlling branch thyristor valve to make capacitor bank
switch on or off. All above processes are done automatically to
avoid impact, impulse and transition caused by the switching of
capacitor.
Voltage reactive power automatic control device
Power systems have been under situation of power shortage with the
tension in the energy resources. The national electricity system
and users has paid attention to the improvement of the economic
operation of power system and a significant reduction in line loss.
There is no effective means to regulate of power factor, balance
the local reactive power, reduce the reactive current, and reduce
heat loss.
TK-DWZT auto voltage var adjustment installation is a new kind of
auto reactive power adjustment equipment. It can stabilize system
voltage, adjust system power factor and low down power system loss.
TK-DWZT auto voltage var adjustment installation adopts voltage
adjusting device to change output voltage at capacitor end to
change reactive output power in this way system power factor can be
changed. No over-voltage or discharging of capacitor occurs during
adjustment, so capacitor is guaranteed to operate at rated voltage.
Output capacity can be continuously adjusted and adjusting range
includes(100-25)% and (100-36)% with nine-stage output.
main characteristic
It can be guaranteed that power factor is within designed range and
in perfect status and at the same time, line loss is the minimum.
Reactive output can be realized by adjusting voltage at capacitor
end to to meet system reactive requirement.
No over-voltage happens during adjustment to guarantee capacitor’s
safety and endurance.
Low-volt closing can low down impact caused by closing inrush to
system and the capacitor.
As voltage adjusting process is doing in the grid and no
discharging and charging occur, real-time adjustment is available.
