1. The SVG cabinet achieves dynamic compensation of reactive power by controlling the on-off of the internal power electronic devices. The detailed principle: The core of the SVG cabinet is power electronic devices such as IGBTs. By precisely controlling the on-off times of these devices, it can quickly and flexibly adjust the magnitude and phase of the output current, thereby providing or absorbing reactive power according to the reactive power demand of the system, achieving the purpose of dynamic compensation.
2. The SVG cabinet calculates the required reactive power based on the real-time detection of system voltage, current, etc. It is equipped with voltage and current sensors, which can collect real-time voltage and current signals from the system. Using the built-in algorithm to analyze and process these signals, it accurately calculates the current reactive power value required by the system, providing a basis for subsequent compensation operations.
3. The SVG cabinet uses pulse width modulation (PWM) technology to generate compensation currents that match the system’s requirements.
Detailed principle: PWM technology adjusts the width of the pulse signal to change the on-off time of the power electronic devices, thereby generating compensation currents with specific amplitudes, frequencies, and phases. These compensation currents can cancel out the reactive currents in the system, effectively improving the power factor of the system.
4. The control system of the SVG cabinet adjusts the output voltage and phase of the internal inverter based on the calculation results.
Detailed principle: After calculating the required reactive power, the control system precisely controls the internal inverter. By changing the output voltage and phase of the inverter, the output compensation current can interact with the reactive current in the system, achieving the effect of reactive power compensation.