Professional System Design
NR Electric takes into account RTDS, analog simulation
environment and PSCAD in the design processes
to study system stability, active and reactive power
distribution and power quality as to optimize SVC system
Optimized filter groups can filter large amount of harmful
harmonics, providing fundamental frequency reactive
power and minimizing dynamic active power losses.
The customized SVC system can analyze system power
quality to check injected harmonic current and filter
The optimal regulation modes will be selected based on
the installation place to gain the most effective voltage/
reactive power regulation.
NR Electric’s TCR valve has many advantages like compacted structures and light weight. Therefore ,occupying less area, and making valve installation and maintenance work much easier. The valve assembly is completed in factory before shipping to ease on-site installation. Only the electrical connection to reactor, the hydraulic connection to water cooling system and the optic connection to control devices are conducted on site.
Electric-optical triggering system
The electrical triggering system is comprised of two parts:
the Valve Control Unit(VCU) in the control room and the
Thyristor Control Unit(TCU) in the valve.
The Control Pulse (CP) is converted to an optic Firing Pulse
(FP) by VCU. This optic FP is then converted to an electric
FP to trigger the thyristor. The conversion between optic
to electric FP is conducted by TCU. If the thyristor is not
forward biased or damaged, the control system will issue
an alarm or stop operating according to the signal sent from
The optic triggering system uses light to trigger thyristor. It
integrates forward overvoltage protection components, and
thyristor management units are used instead of thyristor
Thyristor breaker-over voltage protection
A thyristor can be damaged by a large size forward voltage
if there is no current flowing thought the thyristor. Thus
it is essential to force the thyristor to switch on before
the voltage across the thyristor reaches the break-over
voltage threshold. The break over diode (BOD) is usually
used to protect thyristors from being damaged by forward
overvoltage. However, a series connected BOD can cause
a large deviation in the break-over voltage threshold. To
solve this problem, NR Electric invented the unique circuit
integrated thyristor protection valves. It reduces the breakover
voltage deviation to a minimum value, so that the breakover
voltage can be fixed manually in order to accommodate
different types of thyristor.
Water Cooling System
NR Electric’s SVC system uses the industrial-class
hermetic water cooling system with de-ionized water for
heat dissipation. This patented cooling radiator features
low thermal resistance and low water resistance. Due to
their high reliability, NR Electric’s water cooling systems
are currently utilized in several industrial sectors such as
aviation, power generation and HVDC transmission.
Well-proven protection and control system
The protection and control of the Static Var Compensator
system uses the same reliable software and hardware
platform as the HVDC control and protection system.
The highly integrated software platform uses graphic
programming and test tools to realize diverse control
functions. The universal hardware platform is equipped with
multi-functional modular PCB to achieve data acquisition,
control and monitoring functions.