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-9700 Renewable Energy SCADA PCS-9726 Generation Management Unit PCS-9700F Power Forecast System PCS-9700R AGC/AVC
Battery Energy Storage System PCS-9567MV-10000 Medium Voltage Skid PCS-9567MV-7000 Medium Voltage Skid PCS-9567MV-5000 Medium Voltage Skid PCS-9567MV-3500 Medium Voltage Skid PCS-9567-2500 Twin Power Conversion Systems PCS-9567-2500 電力変換システム PCS-9567-1750 Power Conversion System PCS-9567-1750 電力変換システム PCS-9567 Power Conversion System Vulnerability Disclosure Policy パワーコンディショナー脆弱性開示ポリシー
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 July 12, an sudden line fault gave Alxa in Inner Mongolia a real‑life test of operating a wild-area all-renewable power system in an unplanned islanding mode. The integrated solution for renewable‑energy power systems supplied by NR Electric, consisting of ideal‑synchronous‑source grid‑forming energy storage, integrated fast coordinated control, and optimized dispatching, delivered full‑mark performance during this unplanned islanding.
Ejina Grid-Forming Energy Storage Power Station
At 19:35 on the same day, the 220 kV Tai-E Line — the sole tie line connecting the Ejina county-level power grid to the main grid — tripped, instantly disconnecting the county grid, which spans 114,600 square kilometers, from the main power system.
At the exact moment of the fault, NR Electric's grid-forming energy storage system responded instantaneously and naturally, providing robust support for the continuous, safe, and stable operation of the islanded grid. The security and stability control system accurately identified the islanding condition and seamlessly activated emergency coordinated control, smoothly transitioning the Ejina grid into off-grid operation mode. Together with the energy optimization and dispatch system, it achieved independent and stable power supply with 100% renewable energy sources.
Alxa Power Gird Company promptly initiated the fault handling procedure, with the power dispatch and control company providing full coordination. The Ejina grid operated independently for 57 minutes, during which zero loss of critical loads was achieved, and automatic synchronous reconnection was ultimately successfully completed.
This successful unplanned islanding operation was not the work of a single piece of equipment acting alone, but the result of an entire system where each component performed its role in tightly sequenced coordination, collectively building a security and stability support for the renewable power system.
The Ejina large-scale renewable energy power system, completed and put into operation in 2023, is the world's first wide-area off-grid renewable energy power system. NR Electric provided an integrated solution for renewable power systems centered on grid-forming energy storage for this project. The solution includes an ideal synchronous generator-type grid-forming energy storage system with a total capacity of 25 MW / 25 MWh, as well as complete primary and secondary equipment packages covering security and stability control, fast coordinated control, and an energy management system, fully realizing flexible, coordinated, and optimal control of source, grid, load, and storage across the regional power system.
Since commissioning, the project has completed three challenging tests: black start of a wide-area renewable energy power system, long-duration off-grid operation, and fault ride-through under off-grid conditions. It has also successfully executed multiple actual emergency off-grid situation.
As a global leader in grid-forming technology, NR Electric was the first to propose the grid-forming concept of "building ideal synchronous power sources based on energy storage" and independently developed and launched its "NR-ISGrid" series of grid-forming solutions.