Abstract : A matrix converter (MC) has many outstanding advantages, but it is not a "pure silicon converter" as described in many papers. Like the AC-DC-AC voltage source converter (VSI), the MC also requires energy storage elements. The input filter capacitor and the overvoltage clamping capacitor are the energy storage elements of the MC. The former solves the problem of input current waveform jumps in the MC conversion circuit, while the latter absorbs the magnetic field energy stored in the load inductor during overcurrent protection and achieves kinetic energy buffering. The difference between the two is that the energy storage capacitor of the VSI is concentrated in one place, while that of the MC is distributed in two places. The selection principle of the capacitor is also discussed. Keywords : AC-DC-AC voltage source converter, matrix converter, energy storage capacitor [b][align=center]Does a Matrix Converter Need Energy Storage Elements? Ma Xiaoliang[/align][/b] The input filter capacitor and clamp capacitor for over-voltage protection of the MC are its energy storage elements. The first is used to solve the current jumping variation problem, and the second is used to absorb the magnetic energy in load inductance when over-current occurs and to realize the ridethrough function. The difference is that the energy storage capacitor of the VSI is installed in one place, while the capacitors of the MC are installed in two places. The calculation principles of the capacities are discussed. Keywords: voltage source, AC-DC-AC converter, matrix converter, energy storage capacitors. 1. Overview The idea of ​​matrix converters has been proposed for more than 20 years and has many outstanding advantages. However, due to difficulties in commutation, its development was slow in the early stages. In recent years, with the gradual resolution of these technical difficulties, people have become optimistic about it again, and it has now become one of the most popular topics in power electronic conversion. The outstanding advantages of matrix converters are: single-pass commutation, high efficiency; sinusoidal voltage output; sinusoidal current input, and the current can lead, lag, or be in phase with the voltage (power factor equal to 1); bidirectional power flow, four-quadrant operation, etc. In almost all literature concerning matrix converters, it is mentioned that they have another important advantage: they do not require energy storage components, making them "pure silicon converters." AC-DC-AC voltage-type frequency converters using active front-ends (AFEs) possess all the outstanding advantages of matrix converters and are widely used in industry and transportation, with capacities reaching tens of megawatts. Their disadvantage is the need for large energy storage components. I believe that matrix converters also require energy storage components, and this advantage is debatable. This article will discuss my views, hoping to stimulate further discussion. [b][align=center]For details, please click: Matrix Converters Really Don't Need Energy Storage Components[/align][/b]