Active damping control strategy of matrix converter via modifying input reference currents

Abstract

The matrix converter (MC) with an LC filter at source side suffers from system instability, thereby requiring damping control. To improve system stability, this paper proposes a novel active damping control strategy. Firstly, the method of generating space vector modulation signals is improved, in order to make the amplitude and phase angle of input currents directly controllable without affecting the priority of output voltage control. Then the proposed strategy, which is realized by injecting damping signals into input reference currents, is presented. In this way, the proposed strategy can suppress the oscillations in source currents directly. Besides, it is effective with source voltages or capacitor voltages sampled for modulation, regardless of the operation mode of MC. Furthermore, it is applicable to most of existing modulation algorithms. Finally, experimental results of four-quadrant operation on a 2.4kW prototype illustrate that, under the condition of the same parameters, the proposed active damping control strategy performs better than passive damping control in filtering and the same in damping at source side, without sacrificing the driving performance at output side. Index Terms-Matrix Converter (MC), LC Filter, ActiveDamping Control, Input currents control.

Modulated model predictive current control of an indirect matrix converter with active damping

“…In order to evaluate the performance of M 2 PC strategy for the IMC with active damping in transient state, a step change from 25[Hz] to 50[Hz] at t = 0.06[s] is applied to outputcurrent frequency considering both cases in Fig. 7, and a step change from 12[A] to 16[A] at t = 0.06[s] is applied to outputcurrent reference considering both cases in Fig.…”

“…Both passive and active damping control methods are suitable solutions, while the latter has a better performance with higher efficiency and easier implementation [25]. The basic idea of active damping strategy can be obtained from [26], [27], the method emulates a virtual damping resistor placed in parallel with the capacitor to make the harmonic currents caused by the resonance flow through the virtual damping resistor.…”

Modulated Predictive Control for Indirect Matrix Converter

“…The control of the inverter stage also generates the average DC-Link current idc to be used in the control of the rectifier stage. Even if idc can be calculated using a similar approach to the one in (18), it can also be expressed as in (21) in order to reduce the control computational burden…”

“…where udc is obtained by (18) and Po * is the reference value of the output active power, calculated as in (22) Equation (22) is derived from power balance considerations on the IMC converter. In fact, since the IMC does not present any energy storage elements on the DC-Link, the input active power, DC-Link power, and output active power are always equal, assuming lossless power devices.…”

“…The topology has been suggested as a potential alternative to conventional voltage source converters due to its advantages in terms of power density. For such reasons control strategies [18], [19], modulation algorithms [20]- [25], extended topologies [26] and applications for IMC [27]- [29] are often investigated. When compared to the traditional Back-to-Back converter, the IMC requires a higher number of power semiconductor devices.…”