Amid the rapid integration of renewable energy, the growing complexity of power quality issues, and the increasing demand for reliable power supply, the industry urgently needs systematic and innovative solutions. Dongfang Electronics, in collaboration with research institutes, has focused on tackling real-world challenges and has successfully delivered multiple benchmark projects. Through the "Power Quality Eastern Tour" series, we take you to the project sites to witness how technological innovation is driving grid upgrades and industrial development.
01 Medium-Voltage Flexible Closed-Loop Energy Router Solution – Safeguarding Reliable Power for High-Tech Industries
High-tech industrial clusters are characterized by high industry density and heavy power loads, demanding exceptional power supply reliability and quality. At the same time, the rapid growth of distributed photovoltaics (PV) in these areas has made flexible interconnection across voltage levels and efficient renewable energy integration core requirements for grid upgrades. Dongfang Electronics' independently developed 10kV-20kV medium-voltage flexible closed-loop energy router has been successfully grid-connected in such a cluster, providing a robust power quality shield for high-tech industries.
Core Technologies
±10kV DC stable output. Full-bridge MMC architecture; 100% independently developed core technologies
Innovative hybrid cooling system combining water cooling and air conditioning to handle high-load and high-temperature conditions
Strategic Innovations
Multi-port power decoupling control combined with adaptive droop control
Multi-dimensional adaptive power coordination algorithm based on feeder load status, energy storage state of charge (SOC), and PV output forecasting
Automatic mode switching based on distribution network operating conditions, enabling coordinated optimization across nine operating modes, including feeder load balancing, main transformer overload prevention, and distributed energy integration
Integration of load balancing and energy storage economic operation into a unified optimization framework to resolve hierarchical dispatch and response delays
Project Outcomes
Operational data from the high-tech industrial cluster demonstrates that the medium-voltage flexible closed-loop energy router significantly enhances the distribution network's capacity for renewable energy integration and power supply reliability, providing critical equipment support for the construction of new distribution systems.
02 Medium-Voltage Power Quality Flexible Control Solution – Addressing Source-Load Mismatch Challenges
As distributed PV expands county-wide, many regions face a "dual-high" characteristic—high industrial loads and high PV penetration. During midday, excessive PV generation causes voltage overruns, while at night, concentrated industrial nonlinear loads lead to low voltage and harmonic distortion. Traditional point-based mitigation measures offer only temporary fixes, failing to ensure the safe and stable operation of 10kV lines. In response, Dongfang Electronics, in collaboration with research institutes, has developed a medium-voltage power quality flexible control and mitigation device, installed at the endpoints of two adjacent feeders, delivering a one-stop solution to multiple power quality issues.
Technological Breakthroughs
Full technology stack—from theoretical research to engineering application—independently developed and controlled
Core power units use domestically produced IGBT modules, with self-developed FPGA/ASIC intelligent drive systems, breaking foreign monopolies
A structured theory-based approach to power quality control device development, tailored for wide-band power quality management
Topology combining cascaded H-bridge converters and low-voltage three-level converters for structured power quality control devices, enabling coordinated output of wide-band signals across voltage levels
A coordinated control method for power quality management and power flow in multi-feeder systems
High-density, prefabricated integrated process with heterogeneous partition synergy, solving challenges related to device size, power density limitations, and thermal constraints
Project Outcomes
After commissioning, the voltage qualification rate of the two 10kV feeders improved markedly, with significant reductions in substation voltage distortion and monthly average line losses. This project offers a replicable and scalable model for power quality management in counties with high proportions of distributed PV.
Contact Us
For more information, please contact Mr. Yu at 15610576721.
