Asynchronous grid interconnection
Flexible low-frequency AC transmission technology has the same functions as flexible DC transmission, such as power control, dynamic voltage regulation, and asynchronous grid interconnection.
Break through traditional limitations and improve the reliable transmission capacity of power grid
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Solution for low-frequency transmission
Flexible low-frequency transmission is an efficient AC transmission technology based on power electronic technology. It reduces the transmission frequency of 50 Hz in a traditional power grid to 20 Hz or 50/3 Hz. Compared with the power frequency transmission system, flexible low-frequency transmission helps to increase the line transmission capacity, reduce voltage loss and fluctuation, reduce cable charging reactive power, increase transmission distance and transmission efficiency, and can provide flexible power support for the power grid, which is suitable for low-speed motors used for wind power. etc.
Compared with the DC transmission system, it is characterized by no DC circuit breakers, easy voltage transformation and convenient establishment of a power grid, and has outstanding economic advantages in the range of 70 km-200 km.
Compared with the DC transmission system, it is characterized by no DC circuit breakers, easy voltage transformation and convenient establishment of a power grid, and has outstanding economic advantages in the range of 70 km-200 km.
- Asynchronous grid interconnection
- New energy power generation collection and transmission
- Offshore wind power transmission
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New energy power generation collection and transmission
Results in poor stability in its collection and transmission, which puts pressure on the safe and stable operation of the system. Thus, a new energy multi-terminal collection and transmission system is built based on flexible low frequency, which has the same function as the “Zhangbei Renewable Energy Flexible DC Grid Pilot Project”, achieving centralized smoothing of power fluctuations and presenting a stable power supply characteristic to the outside. Flexible low-frequency transmission is still an AC system, which is easy to disconnect and connect.
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Offshore wind power transmission
The development of offshore wind power is showing a trend of high capacity and development towards the far sea areas.Submarine cables have a large capacitance to the ground, and power frequency AC is suitable for wind farms within 50 km offshore.The construction, operation and maintenance costs of flexible DC offshore converter stations are high, while flexible low-frequency transmission does not require the construction of offshore converter stations, which greatly reduces construction, operation and maintenance costs.Flexible low-frequency transmission has obvious economic advantages within the offshore distance range of 70 to 200 km.
Value of Solutions
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More safer system
- Multiple bypass protection design, full-link control redundancy design, no faulty power module with lost control in the system, zero blackouts, ensure the safety of the power grid.
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Grid friendly
- Accurate voltage and current control is suitable for weak power grid applications with a high proportion of new energy.
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High operating efficiency
- Overall loss of converter valve<0.6%, enhancing the system's economy.
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Better reliability
- High-end board design and verification leads to zero failure in extreme EMC environments.
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Leading control performance
- The valve-controlled link delay is at the industry-leading level, and the independently developed virtual impedance strategy effectively suppresses the risk of wide-band oscillation in the system.
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Smart O&M
- Intelligent online monitoring and expert system diagnosis, convenient operation and maintenance design, realize unmanned monitoring, intelligent and convenient operation and maintenance.
Applications
Urban Power Supply
We utilize existing lines to increase power supply capacity and balance power flow.
Island Power Supply
Low cost, high adaptability, and passive inversion.
Small-Scale Power Generation
Increased efficiency, grid feedback, and renewable energy generation.
AC Transmission Conversion
This increases transmission capacity and enhances network stability in the vicinity.
Power supply for drilling platforms
Environmental protection, and power transmission between platforms.
Multi-terminal DC power supply
Capacity expansion, high independence, and strong robustness.
Asynchronous interconnection
Connecting asynchronous grids with fully controlled power.
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