Protection&Control Transmission Line Protection Busbar Protection Transformer Protection Circuit Breaker Protection Generator Protection Feeder Protection Capacitor Protection Motor Protection Transfer & Synchronization Arc Protection
Digital Substation PCS-221S Merging Unit PCS-221 Merging Unit PCS-222 Circuit Breaker Controller PCS-9250 AC Electronic CT/VT
Automation PCS-9700 Automation System PCS-9700 HMI Software PCS-9705 Bay Control Unit PCS-9705S Bay Control Unit PCS-9799 Station Manager PCS-9799S Station Manager PCS-9710 Remote Terminal Unit PCS-9710S Remote Terminal Unit PCS-9794 Protocol Converter PCS-9785 Satellite-Synchronized Clock PCS-9882 Ethernet Switch PCS-9882Rx DIN Rail Managed Ethernet Switch PCS-9882XD Managed Ethernet Switch PCS-9884 Managed Ethernet Switch Supporting HSR and PRP MUX-2M/64 Communication Interface
Phasor Measurement PCS-997S Fault Line Locator PCS-996S-G Phasor Data Concentrator PCS-996 Phasor Measurement Unit
Disturbance Fault Recording PCS-996RC Disturbance Fault Recorder PCS-996R Disturbance Fault Recorder PCS-986 Disturbance Fault Recorder PCS-9013 DFR Management System
Stability Control System PCS-992 Power Stability Control System PCS-993 Out-of-Step Controller PCS-994 Frequency & Voltage Controller PCS-994S Frequency and Voltage Controller
Power Grid Monitoring and Control PCS-9000 Energy Management System PCS-9000 Distribution Management System
Configuration Tool PCS-Torch MOT Tool PCS-Studio Configuration Tool PCS-Explorer IED Configuration & Debugging Tool PCS-SCD Configuration Tool PCS-COMM Configuration & Debugging Tool
Accessories MD1501 Series Auxiliary Relays MD1701 Series Test Blocks MD1701S Test Block
FACTS PCS-9580 Static Var Compensator PCS-9583 Static Synchronous Compensator PCS-9570 Series Compensation PCS-9590 DC De-Icer PCS-9578 Controllable Shunt Reactor PCS-8200 Unified Power Flow Controller PCS-9571 Fault Current Limiter PCS-9564A Dynamic Voltage Restorer PCS-9569 Shore Power System
HVDC PCS-8600 UHVDC Converter Valve System PCS-9550 LCC-HVDC Control and Protection System PCS-8100 VSC-HVDC IGBT Valve PCS-9520 VSC-HVDC Control and Protection System PCS-9510 Cooling System PCS-8300 High-voltage DC Circuit Breaker PCS-9250 DC Electronic CT/VT
PV & Wind Power Grid-Connection PCS-9561 Wind Energy Converter System PCS-9700 Renewable Energy SCADA PCS-9726 Generation Management Unit PCS-9700F Power Forecast System PCS-9700R AGC/AVC PCS-9563 PV Grid-Connected Inverter
Battery Energy Storage System PCS-8811CB Centralized energy storage system PCS-8812PB Liquid cooled energy storage cabinet PCS-8813CPB High voltage directly connected energy storage system PCS-9567A Power Conversion System PCS-9567C BESS Control Unit PCS-9700 Energy Storage System
Microgrid PCS-9617MG Microgrid Controller
Static Frequency Converter PCS-9575 Static Frequency Converter
Protection,Automation&Control DMS EMS Stability Control & WAMS Digital Substation
HVDC & FACTS De-Icing Unified Power Flow Controller (UPFC) Series Compensation Static Synchronous Compensator(STATCOM) Static Var Compensator (SVC) LCC-HVDC Transmission VSC-HVDC Transmission
Renewable & Microgrid Energy Storage System Microgrid PV Generation SFC
Power Generation Pumped Storage Power Plant Nuclear Power Plant Hydro Power Plant Thermal Power Plant
Transmission System AC Transmission LCC-HVDC Transmission VSC-HVDC Transmission
Distribution System Distribution Network
Industrial Consumer Urban Track Traffic Electrified Railway Oil & Petrochemical Metals & Mining
On June 30, 2023, the launch ceremony of the Hangzhou 220kV Flexible Low Frequency Transmission Demonstration Project of State Grid Zhejiang Power was successfully held at the Tingshan Low Frequency Converter Station, marking the world's highest voltage level and largest transmission capacity flexible low frequency transmission project was officially put into operation.
The Hangzhou Flexible Low Frequency Transmission Demonstration Project is the first attempt to apply flexible low frequency transmission technology to the interconnection of urban regional power grids. While constructing a high flexible power grid in urban areas and ensuring the electricity consumption for the Hangzhou Asian Games, it also provides a reference for the high-voltage and high-capacity offshore wind power transmission plan through flexible low frequency, and has a good demonstration effect. The project has constructed two high-voltage and high-capacity low-frequency converter stations, Tingshan and Zhongbu. Through flexible low-frequency methods, the two major load centers of Fuyang and Xiaoshan in Hangzhou are interconnected, which can achieve flexible power flow in the Fuyang and Shengguang power supply areas of the Hangzhou power grid, greatly improving the reliability of regional power supply. After the project is put into operation, it can provide 300MW of flexible electricity support for the main event venues of the Hangzhou Asian Games, meeting the peak electricity demand during the event period.
As the core supplier of Hangzhou's flexible low-frequency transmission project, NR has provided a complete set of flexible low-frequency control and protection systems, low-frequency AC protection devices, measurement equipment, and other core equipment, as well as a complete set of low-frequency converter valves and other equipment for the Tingshan low-frequency converter station.
Since the establishment of the project, NR has closely cooperated with State Grid Zhejiang Company, starting from theoretical research and combining with actual engineering conditions, carried out a large number of mathematical modeling, theoretical derivation, simulation analysis, and experimental verification.
The flexible low-frequency complete equipment of NR operates stably, successfully passing rigorous assessments such as 300 MW full power test and low-frequency line manual short circuit test, and successfully completing 168 hours of trial operation. The complete equipment of NR has demonstrated excellent protection & control characteristics, precise AC protection response, and friendly grid connection performance.
The smooth operation of the Hangzhou Flexible Low Frequency Transmission Project marks the successful application of the NR Flexible Low Frequency Complete Equipment in the flexible interconnection of regional power grids at both ends, following the successful service of the Taizhou Flexible Low Frequency Transmission Project in 2022 for offshore wind power grid connection. This lays a solid foundation for future participation in the establishment of flexible low frequency power grids and demonstrates NR's technological leadership in the field of flexible transmission and relay protection.