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HVDC
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An HVDC electric power transmission system may be less expensive and suffer lower electrical losses for long-distance transmission. In addition, HVDC avoids the heavy currents required by the cable capacitance for submarine power cables. HVDC also enables power transmission between asynchronous AC power grids, and can supply power to urban heavy load center. NR’s complete HVDC transmission solutions are built upon the latest LCC-HVDC(Line Current Commutated HVDC) and VSC-HVDC(Voltage-Sourced Converter HVDC) technologies. Combined with deep system studies and design, NR offers “All-In-One” HVDC Transmission solutions with long-term warranty and long-lasting spare part supply to meet clients’ needs
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PCS-8600 UHVDC Converter Valve System
UHVDC converter valve system is the demarcation point between AC system and DC system, and it mainly includes converter valve, valve control unit (VCU) and valve cooling system. The converter valve, as the core primary equipment of DC transmission system, is comprised of thyristor, radiator,equalizing and damping circuit, reactor, thyristor control unit (TCU) and surge arrester, etc. VCU is the bridge between the control & protection system and the converter valve, and it is responsible for receiving control signals from the control & protection system, and generat…
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PCS-9550 LCC-HVDC Control and Protection System
A conventional HVDC control and protection system is a key part in guaranteeing the overall performance of the HVDC thyristor-based transmission system. It contributes to safe and steady system operation, provides flexible operating modes and accurate control effects, helps to clear fault and assists in system recovery during system disturbances.A well-designed control and protection system can maximally exert the advantages of conventional HVDC transmission technology in the following aspects: Long -distance large-capacity power transmission Underground or underwater cable tr…
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PCS-8100 VSC-HVDC IGBT Valve
The PCS-8100 converter valve is comprised of sub-modules, converter valve tower and valve control units. It is one of the core equipment of HVDC SuperConTM which is used to achieve mutual conversion between DC and AC. NR Electric HVDC SuperConTM system is based on a modular multi-level voltage sourced converter technology. Its innovative design offers technical and economic advantages. The capacitor and IGBT-based switching devices are key components of a submodule. The valve in each phase is composed of several submodules and a series of connected reactors. …
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PCS-9520 VSC-HVDC Control and Protection System
The control and protection is the brain of the entire VSC-HVDC system. The HVDC SuperConTM control system employs tough UAPC platform designed by NR Electric. It adopts hierarchical structure, redundant design, robust control functions and comprehensive protection scheme. It monitors, controls and protects all AC and DC in the VSC-HVDC transmission system.Control and protection system is designed based on embedded CPU, DSP, FPGA module. CPU takes care of parameter setting, display and etc, DSP is implementing calculation to achieve all cont…
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PCS-9510 Cooling System
NR Electric’s patented Water Cooling System is exclusively designed for valve cooling of power electronics equipment. It is widely applied in seamless cooling of valves and to increase the efficiency of vavles.PCS-9510 water cooling system adopts enclosed water cooling mode, it consists of internal cooling system, external cooling system and valve cooling control & protection system.
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PCS-8300 High-voltage DC Circuit Breaker
PCS-8300 high-voltage DC circuit breaker applies advanced hybrid topology, it is composed of three branches, namely main load branch, breaker branch and MOV dissipation branch.Normal current flows through the main load branch and it has low operation losses. When some fault occurs on the DC side, the valve banks of main load branch are first blocked, and the current is forcibly transferred to the breaker branch. At the same time, the high-speed mechanical switch located at the main branch is opened to achieve arc-free breaking. When the mechanical switch is disconnected, the valv…
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PCS-9250 DC Electronic CT/VT
NR Electric provides DC electronic CT, electronic VT and DC filter electronic CT for double-line commutation converter (LCC) and voltage source converter (VSC-based) HVDC transmission projects. The DC electronic transformers have advantages of small size, light weight, and no ferromagnetic resonance problems.
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