Static Synchronous Compensator (STATCOM) is a parallel type of FACTS device for reactive power compensation, which can emit or absorb reactive power, and its output can vary to control specific parameters in the power system. Generally speaking, it is a solid-state switching converter. When its input terminal is connected to a power supply or energy storage device, its output terminal can independently emit or absorb controllable active and reactive power; It can improve the functions of the power system in the following aspects: dynamic voltage control, power oscillation damping, transient stability, voltage flicker control, etc. Compared with traditional reactive power compensation devices, STATCOM has the advantages of continuous regulation, small harmonics, low losses, wide operating range, high reliability, and fast regulation speed. Since its inception, it has received widespread attention and rapid development. Static synchronous compensator (STATCOM or SVG) is a dynamic reactive power compensation device based on voltage source converter (VSC), and is a typical representative of the second generation FACTS device. A reactive power dynamic compensation device that generates and absorbs reactive power through a self commutating power semiconductor bridge converter. It is composed of an AC link and a DC link, and the AC link is connected to the system. It first converts the AC energy of the system into DC through a converter and stores it in the energy storage device on the DC side. At the same time, the DC side voltage and current are converted into AC voltage and current through the converter and transmitted to the system. It regards the converter circuit as an AC voltage source that generates fundamental and harmonic voltages, controls the magnitude and phase of the fundamental voltage of the compensator, and can change the magnitude and phase of the fundamental reactive current. When the fundamental voltage of the converter is higher than the AC power supply voltage, the converter will generate a leading (capacitive) reactive current. On the contrary, when the fundamental voltage of the inverter is lower than the AC power supply voltage, a lagging (inductive) reactive current will be generated. Therefore, it can exchange reactive power with the system and is also "stationary", so it is also known as the "Static Reactive Power Generator" (SVG), which is different from capacitors (where the current decreases proportionally at low voltages). Under various system voltages, the SVG can generate rated current, similar to a rotating synchronous motor with three sinusoidal symmetrical voltages. The static synchronous compensator uses a power electronic device with a voltage source converter to generate reactive power. A voltage source converter converts the DC voltage into a three-phase voltage of the required amplitude, frequency, and phase. Depending on the required output power and voltage, the voltage source converter can be a two-level or three-level type