RLC Islanding Test Load Prevents Islanding in Photovoltaic Power Stations
RLC's anti-islanding test load prevents the occurrence of islanding in photovoltaic power stations. Islanding is an inevitable phenomenon in grid-connected photovoltaic power generation systems, posing significant harm to human safety. When the power grid stops operating, the system is no longer controlled by the grid, and its parameters will oscillate based on the inverter's power and load adaptability, potentially damaging electrical equipment. If the grid exhibits islanding effects, its load operation depends on a single inverter. If the inverter's power is low and the bandwidth is high, it may overheat and burn due to overload, resulting in material losses. When the photovoltaic power station reconnects to the grid, there may be instances of unsynchronization. Therefore, solar power plants must employ RLC's anti-islanding test load to prevent islands and associated risks.
What is an Isolation Protection Device?
Island Protection is designed for distributed power generation systems, primarily used for low-power sources such as wind and solar energy. Based on the power supply status of the inverter, after detection and calculation, it can determine to disconnect the inverter's output when a power grid fault occurs. This protection is known as Island Protection. It is mainly used for small grid-connected power generation systems in 10kV and 380V low-voltage photovoltaic power stations. In the event of islanding, it can accurately detect the voltage and frequency at that point. Then, if the fluctuations in voltage and frequency exceed the set values, the output operation and the connection switch should be disconnected.
The primary function of anti-islanding protection
Overvoltage tripping (optional reset);
2. Low-voltage disconnection (optional reset).
3. Auto-shutdown under pressure (resettable option).
4. Over-frequency disconnection (optional reset).
5. Low-frequency disconnection (optional reset).
6. Switch immediately to reverse power detection (reset optional).
7. Isolation Differential Protection (optional reset feature).
8. Measurement and Control Functions: U, I, P, Q, COS Φ, F (must measure current and voltage input).
9. The system can automatically restore the closing operation.
Island Prevention Main Protection Device
1) Overvoltage Protection
2) Low-voltage protection
Prevent overfrequency.
4) Low-Frequency Protection
Frequency Surge Protection Prevention
6) Reverse Current Protection
7) External Fault Tolerance Peak
8) Harmonic Monitoring and Over-Protection; Control Functions;
9) 12-way remote path adaptation
9-channel control output, 3-channel signal output.
