Model Predictive Control for Indirect Boost Matrix Converter Based on Virtual Synchronous Generator

Abstract

Indirect boost matrix converter is potentially a great alternative to a back-to-back converter for permanent magnet synchronous generators based distributed generation since it can achieve a voltage-boost functionality without utilizing a bulky DC-link capacitor. Despite the success of the indirect boost matrix converter topology, there still exist some issues in the relevant control structure that must be resolved appropriately. First, the existing controls are grid-following controls, which is incapable of islanded operation. Secondly, the exiting controls generate a highly distorted current waveform, which needs to be suppressed by a passive damping resistor. Moreover, without an energy storage element, the distributed generations have no short-time power reserve unit for providing an inertial power to support the utility. In order to solve these issues, a novel approach based on a modified virtual synchronous control and a finite control set model predictive control scheme is proposed in this paper. The former is adopted to ensure proper operations in both grid-connected and islanded modes and to emulate the virtual inertial response by drawing inertial power from the input source. The latter utilizes multi-controls of real-time variables to avoid complicated coupling between the input side and the output side controls and to grant the indirect boost matrix converter with the capability of providing active filter resonance damping. Comparative studies between the proposed control and its existing counterpart are conducted with several simulations in PSCAD/EMTDC software to demonstrate the superior performances of the proposed strategy. Finally, the proposed control is verified in a scale-down experiment testbed. INDEX TERMS AC-AC converters, distributed power generations, indirect matrix converter, power control, power system stability, predictive control, virtual synchronous generator.

Small‐signal analysis of multiple virtual synchronous machines to enhance frequency stability of grid‐connected high renewables

“…The authors in [14] presented a method to select proper VISMA parameters regarding system frequency protection scheme. Then, the authors applied the robust control theory [17], model predictive control [12] and fuzzy logic [15,16] to determine optimal VISMA parameters regarding system stability enhancement. Consequently, it becomes a promising technique for integrating RESs into the existing power systems.…”

Virtual Synchronous Generator Using an Intelligent Controller for Virtual Inertia Estimation

“…The VSG possesses the ability to provide grid support and to improve the stability of frequency and power flow. Furthermore, the VSG control can also perform in an islanded operation mode, naturally guaranteeing load sharing [13], which is similar to traditional SGs [7,8]. Hence, there have been many studies focusing on VSG control, as reviewed in [14,15].…”

“…Hence, there have been many studies focusing on VSG control, as reviewed in [14,15]. In [13], a new algorithm based on a finite-control-set model-predictive-control scheme and a corrective VSG control was proposed to suppress the distorted current waveform. In addition, an improved synchronization stability method that adopts the frequency difference between the power grid and VSG for reactive power control was researched in [14].…”

Active damping method for voltage source inverter-based distributed generator using multivariable finite-control-set model predictive control

“…A study on the FCS-MPC scheme for grid-connected VSIs was conducted in [10]. Additionally, other FCS-MPC-based methods for various power converters' topologies are proposed in [11]- [15]. Conclusively, the FCS-MPC scheme's benefits are presented, including simple implementation, straightforward control law, and fast dynamic response.…”

“…Recently, several active damping solutions based on multivariable control for grid-connected rectifiers have been proposed [22]- [24]. The concept of FCS-MPC-based multivariable control can also be applied to grid-connected voltage source inverters (VSIs), as suggested in [13]- [15]. Nevertheless, in the referred works, the purpose of a filter current control inclusion was to achieve overcurrent prevention.…”