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 8, 2022, NR controlled switching device was successfully put into operation in Fengning pumped storage power station with the largest installed capacity in the world, which successfully ensured that the pumping and storage power station units were connected to Zhangbei flexible DC power grid. This is the first application of NR's controlled switching device in a large-scale pumped storage project.
Fengning pumped storage power station is a key project serving the Beijing Winter Olympics to achieve 100% green power supply. It is the first time that the pumped storage power station connected to the flexible DC power grid, which provide a valuable solution to solve the problem of large-scale development and utilization of renewable energy.
Fengning pumped storage power station is known as the world's largest "super power bank", close to the core area of the 10 GW wind power base.
The power station is equipped with 12 units, with a total installed capacity of 3.6 GW, an annual saving of 480,000 tons of standard coal and a reduction of 1.2 million tons of carbon dioxide emissions.
In order to reduce the impact of the main transformer switching of Fengning Pumped Storage Power Station on the flexible DC system in Zhangbei, NR has cooperated with customer to discuss the issues of main transformer charging excitation inrush current and voltage harmonics, and proposed a solution for adding controlled switching device on all 500kV transformer sides circuit breakers of pumped-storage power stations.
In order to meet the complex "pumped storage + flexible DC" excitation inrush current suppression requirements, NR has comprehensively considered factors such as the harsh working conditions of two main transformers in parallel, the mechanical dispersion of circuit breakers, transformer parameters, and remanence level. Before the main transformer was officially put into operation, a large amount of test data was collected, and simulation calculation research was fully carried out. The main transformer switching test of 1, 2, 9 and 10 units successfully suppressed the maximum inrush current from more than 1000A to less than 300A, effectively reducing the busbar voltage distortion and system harmonic content. The pumped-storage power station can be reliably integrated into the flexible DC grid under the impact disturbance of the main transformer switching.
With the construction and development of a advance power system with a high proportion of renewable energy and power electronic device connected to the grid, the need for grid stability to suppress harmonics and disturbances has become prominent. As an important technical means to mitigate transient shocks, controlled switching technology will also face more opportunities and challenges. NR will continue to develop high-quality product and solution to make more efforts for power system reliability and flexibility.