Three-phase current-source inverters are an alternative solution for interfacing photovoltaic mod... more Three-phase current-source inverters are an alternative solution for interfacing photovoltaic modules to the utility thanks to its voltage boosting ability. This paper presents a virtual synchronous generator strategy for a three-phase current-source inverter using a multivariable model predictive control. The proposed method can ensure operations in both grid-connected and islanded modes while achieving virtual inertia features to stabilize the grid frequency and active damping to reduce grid current distortions caused by an output CL filter included on the grid side of the system. The obtained simulation results in the PSCAD/EMTDC environment software verify the effectiveness and the excellent performance of the proposed method.
Indirect boost matrix converter is potentially a great alternative to a back-to-back converter fo... more 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 pr...
2021 18th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 2021
Distributed generators (DGs) based on Virtual Synchronous Generator (VSG) control can suppress th... more Distributed generators (DGs) based on Virtual Synchronous Generator (VSG) control can suppress the deviation in frequency at the expense of producing power oscillation. It was suggested that a damping term produced from state feedback control could be included in the VSG scheme to solve this issue. This method has been recently adopted for the VSG control using different techniques such as the pulse width modulation (PWM) and the Finite-Control-Set-Model-Predictive-Control (FCS-MPC) schemes. In this paper, the differences in the transient response of the VSG brought by these two methods are studied. Small signal models for both control methods are derived for comparing the power and frequency dynamic response during a small loading transition. The results verified by simulation in PSCAD/EMTDC have shown that the FCS-MPC-based VSG control's suppressing ability against the maximal frequency deviation is superior to its PWM counterpart. (DC/AC converter, Distributed power generatio...
2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia), 2018
Virtual synchronous generator (VSG) control has an important effect to support the frequency stab... more Virtual synchronous generator (VSG) control has an important effect to support the frequency stability of power system thanks to its inertia support feature. However, with increasing penetration of inverter-based distributed generation, it is of great importance that the control scheme keeps enhancing its capacity in other key issues such as fault ride-through (FRT) capability. For this purpose, the idea of finite-set model predictive control (FS-MPC) based VSG control was studied in this paper. The proposed scheme allows multiple inputs multiple outputs (MIMO) system to control voltage and current simultaneously. Under these constantly placed voltage and current constraints, the controller displayed the ability to prevent the system from overcurrent condition. Several simulation studies are conducted in PSCAD/EMTDC to investigate the performance and FRT capability of the proposed strategy.
Virtual synchronous generator (VSG) control has the ability to support frequency stability of pow... more Virtual synchronous generator (VSG) control has the ability to support frequency stability of power system thanks to its inertia support feature. However, for the sake of transient stability, voltage and current should be restrained within an acceptable range during a fault event. In this paper, a comparison of current-limiting strategies during fault ride-through (FRT) is presented. A voltage-controlled VSG with an inner current controller and finite-set model predictive control (FS-MPC) based VSG control were studied. Comparative tests of single-line-to-ground fault and three-phase-fault-to-ground were conducted in PSCAD/EMTDC. Simulation results show that FS-MPC based VSG possesses better FRT capability.
IEEE Journal of Emerging and Selected Topics in Power Electronics
Distributed generations are expected to be penetrated widely and largely in the future power grid... more Distributed generations are expected to be penetrated widely and largely in the future power grid. Virtual synchronous generator (VSG) control can play a vital role to support the frequency stability of such power grid due to its virtual inertia feature. However, power quality and current control are still challenging aspects of the VSG-based distributed generators (DGs) operation under transient disturbances, such as voltage sag. In this article, a novel finite-set model predictive control (FS-MPC) based method for VSG was studied. The proposed scheme allows a multiple-input–multiple-output (MIMO) system to control voltage and current simultaneously. Under these constantly placed voltage and current constraints, the controller displayed the ability to prevent the system from overcurrent condition and to ride through fault, whereas the injection of nonsinusoidal current under the conditions of unbalanced voltage sag was suppressed. Several simulation and experimental studies were conducted, which validates the superior current-limiting ability and fault ride-through (FRT) capability of the proposed strategy in comparison with the existing methods.
International Journal of Power Electronics and Drive Systems (IJPEDS), 2021
Despite its advantages, the LCL filter can significantly distort the grid current and constitute ... more Despite its advantages, the LCL filter can significantly distort the grid current and constitute a substantially more complex control issue for the gridconnected distributed generators (DGs). This paper presents an active damping approach to deal with the LCL filter's oscillation for the finitecontrol-set model predictive control (FCS-MPC)-three-phase voltage source inverters (VSIs)-based DG. The new approaches use the multivariable control of the inverter side's filter current and capacitor voltage to suppress the LCL filter resonance. The proposed method has been tested in steadystate and under grid voltage disturbances. The comparative study was also conducted with the existing virtual resistance active damping approaches for an FCS-MPC algorithm. The study validates the developed control schemes' superior performance and shows its ability to eliminate lower-order grid current harmonics and decrease sensitivity to grid voltage distortion.
Three-phase current-source inverters are an alternative solution for interfacing photovoltaic mod... more Three-phase current-source inverters are an alternative solution for interfacing photovoltaic modules to the utility thanks to its voltage boosting ability. This paper presents a virtual synchronous generator strategy for a three-phase current-source inverter using a multivariable model predictive control. The proposed method can ensure operations in both grid-connected and islanded modes while achieving virtual inertia features to stabilize the grid frequency and active damping to reduce grid current distortions caused by an output CL filter included on the grid side of the system. The obtained simulation results in the PSCAD/EMTDC environment software verify the effectiveness and the excellent performance of the proposed method.
Indirect boost matrix converter is potentially a great alternative to a back-to-back converter fo... more 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 pr...
2021 18th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 2021
Distributed generators (DGs) based on Virtual Synchronous Generator (VSG) control can suppress th... more Distributed generators (DGs) based on Virtual Synchronous Generator (VSG) control can suppress the deviation in frequency at the expense of producing power oscillation. It was suggested that a damping term produced from state feedback control could be included in the VSG scheme to solve this issue. This method has been recently adopted for the VSG control using different techniques such as the pulse width modulation (PWM) and the Finite-Control-Set-Model-Predictive-Control (FCS-MPC) schemes. In this paper, the differences in the transient response of the VSG brought by these two methods are studied. Small signal models for both control methods are derived for comparing the power and frequency dynamic response during a small loading transition. The results verified by simulation in PSCAD/EMTDC have shown that the FCS-MPC-based VSG control's suppressing ability against the maximal frequency deviation is superior to its PWM counterpart. (DC/AC converter, Distributed power generatio...
2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia), 2018
Virtual synchronous generator (VSG) control has an important effect to support the frequency stab... more Virtual synchronous generator (VSG) control has an important effect to support the frequency stability of power system thanks to its inertia support feature. However, with increasing penetration of inverter-based distributed generation, it is of great importance that the control scheme keeps enhancing its capacity in other key issues such as fault ride-through (FRT) capability. For this purpose, the idea of finite-set model predictive control (FS-MPC) based VSG control was studied in this paper. The proposed scheme allows multiple inputs multiple outputs (MIMO) system to control voltage and current simultaneously. Under these constantly placed voltage and current constraints, the controller displayed the ability to prevent the system from overcurrent condition. Several simulation studies are conducted in PSCAD/EMTDC to investigate the performance and FRT capability of the proposed strategy.
Virtual synchronous generator (VSG) control has the ability to support frequency stability of pow... more Virtual synchronous generator (VSG) control has the ability to support frequency stability of power system thanks to its inertia support feature. However, for the sake of transient stability, voltage and current should be restrained within an acceptable range during a fault event. In this paper, a comparison of current-limiting strategies during fault ride-through (FRT) is presented. A voltage-controlled VSG with an inner current controller and finite-set model predictive control (FS-MPC) based VSG control were studied. Comparative tests of single-line-to-ground fault and three-phase-fault-to-ground were conducted in PSCAD/EMTDC. Simulation results show that FS-MPC based VSG possesses better FRT capability.
IEEE Journal of Emerging and Selected Topics in Power Electronics
Distributed generations are expected to be penetrated widely and largely in the future power grid... more Distributed generations are expected to be penetrated widely and largely in the future power grid. Virtual synchronous generator (VSG) control can play a vital role to support the frequency stability of such power grid due to its virtual inertia feature. However, power quality and current control are still challenging aspects of the VSG-based distributed generators (DGs) operation under transient disturbances, such as voltage sag. In this article, a novel finite-set model predictive control (FS-MPC) based method for VSG was studied. The proposed scheme allows a multiple-input–multiple-output (MIMO) system to control voltage and current simultaneously. Under these constantly placed voltage and current constraints, the controller displayed the ability to prevent the system from overcurrent condition and to ride through fault, whereas the injection of nonsinusoidal current under the conditions of unbalanced voltage sag was suppressed. Several simulation and experimental studies were conducted, which validates the superior current-limiting ability and fault ride-through (FRT) capability of the proposed strategy in comparison with the existing methods.
International Journal of Power Electronics and Drive Systems (IJPEDS), 2021
Despite its advantages, the LCL filter can significantly distort the grid current and constitute ... more Despite its advantages, the LCL filter can significantly distort the grid current and constitute a substantially more complex control issue for the gridconnected distributed generators (DGs). This paper presents an active damping approach to deal with the LCL filter's oscillation for the finitecontrol-set model predictive control (FCS-MPC)-three-phase voltage source inverters (VSIs)-based DG. The new approaches use the multivariable control of the inverter side's filter current and capacitor voltage to suppress the LCL filter resonance. The proposed method has been tested in steadystate and under grid voltage disturbances. The comparative study was also conducted with the existing virtual resistance active damping approaches for an FCS-MPC algorithm. The study validates the developed control schemes' superior performance and shows its ability to eliminate lower-order grid current harmonics and decrease sensitivity to grid voltage distortion.
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Papers by Jonggrist Jongudomkarn