Application of Fuzzy PI Control Algorithm as Stator Power Controller of a Double-Fed Induction Machine in Wind Power Generation Systems

Chung, Gyo-Bum,Choi, Jae-Ho The Korean Institute of Power Electronics 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.1

This paper addresses the output control of a utility-connected double-fed induction machine (DFIM) for wind power generation systems (WPGS). DFIM has a back-to-back converter to control outputs of DFIM driven by the wind turbine for WPGS. To supply commercially the power of WPGS to the grid without any problems related to power quality, the real and reactive powers (PQ) at the stator side of DFIM are strictly controlled at the required level, which in this paper is realized with the Fuzzy PI controller based on the field orientation control. For the Sinusoidal Pulse Width Modulation (SPWM) converter connected to the rotor side of DFIG to maintain the controllability of PQ at the state side of DFIM, the DC voltage of the DC link capacitor is also controlled at a certain level with the conventional Proportion-Integral (PI) controller of the real power. In addition, the power quality at the grid connected to the rotor side of DFIM through the back-to-back converter is maintained in a certain level with a PI controller of the reactive power. The controllers for the PQ at the stator side of DFIM, the DC link voltage of the back-to-back inverter and the reactive power at the grid connected to the rotor side of DFIM are designed and simulated in the PSIM program, of which the result verifies the performance of the proposed controllers.

Application of Fuzzy PI Control Algorithm as Stator Power Controller of a Double-Fed Induction Machine in Wind Power Generation Systems

Gyo-Bum Chung,Jaeho Choi 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.1

This paper addresses the output control of a utility-connected double-fed induction machine (DFIM) for wind power generation systems (WPGS). DFIM has a back-to-back converter to control outputs of DFIM driven by the wind turbine for WPGS. To supply commercially the power of WPGS to the grid without any problems related to power quality, the real and reactive powers (PQ) at the stator side of DFIM are strictly controlled at the required level, which in this paper is realized with the Fuzzy PI controller based on the field orientation control. For the Sinusoidal Pulse Width Modulation (SPWM) converter connected to the rotor side of DFIG to maintain the controllability of PQ at the state side of DFIM, the DC voltage of the DC link capacitor is also controlled at a certain level with the conventional Proportion-Integral (PI) controller of the real power. In addition, the power quality at the grid connected to the rotor side of DFIM through the back-to-back converter is maintained in a certain level with a PI controller of the reactive power. The controllers for the PQ at the stator side of DFIM, the DC link voltage of the back-to-back inverter and the reactive power at the grid connected to the rotor side of DFIM are designed and simulated in the PSIM program, of which the result verifies the performance of the proposed controllers.

Application of Fuzzy PI Control Algorithm as Stator Power Controller of a Double-Fed Induction Machine in Wind Power Generation Systems

정교범,최재호 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.1

This paper addresses the output control of a utility-connected double-fed induction machine (DFIM) for wind power generation systems (WPGS). DFIM has a back-to-back converter to control outputs of DFIM driven by the wind turbine for WPGS. To supply commercially the power of WPGS to the grid without any problems related to power quality, the real and reactive powers (PQ) at the stator side of DFIM are strictly controlled at the required level, which in this paper is realized with the Fuzzy PI controller based on the field orientation control. For the Sinusoidal Pulse Width Modulation (SPWM) converter connected to the rotor side of DFIG to maintain the controllability of PQ at the state side of DFIM, the DC voltage of the DC link capacitor is also controlled at a certain level with the conventional Proportion-Integral (PI) controller of the real power. In addition, the power quality at the grid connected to the rotor side of DFIM through the back-to-back converter is maintained in a certain level with a PI controller of the reactive power. The controllers for the PQ at the stator side of DFIM, the DC link voltage of the back-to-back inverter and the reactive power at the grid connected to the rotor side of DFIM are designed and simulated in the PSIM program, of which the result verifies the performance of the proposed controllers.

Fuzzy Control for Back to Back Converter in DFIG for Wind Power Generation

Fajar Sastrowijoyo,Jaeho Choi,Gyo-Bum Chung 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5

This paper describes the control of a utility-connected double-fed induction generator (DFIG) for wind power generation systems (WPGS). Real and reactive powers (PQ) at the stator side of DFIG are strictly controlled to supply the power to the grid without any problems. In addition, DC voltage of the DC link capacitor is also controlled at a certain level with the conventional PI control of the real power, and the power quality at the grid connected to the rotor side of DFIG through the back-to-back converter is maintained in a certain level with a PI control of the reactive power. In this paper, the control is realized using Fuzzy controller based on the stator-flux orientation control. The validity of the proposed algorithm is verified by the comparative study with the conventional PI controller under the balanced and unbalanced grid voltage condition.

Fuzzy Control for Back to Back Converter in Double-Fed Induction Machine in Wind Power Generation System

Fajar Sastrowijoyo,Novie Ayub Windarko,Jaeho Choi,Gyo-Bum Chung 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.11

This paper describes the control of a utility-connected doublefed induction machine (DFIM) for wind power generation systems (WPGS). Real and reactive powers (PQ) at the stator side of DFIM are strictly controlled to supply the power to the grid without any problems. In this paper the control is realized using Fuzzy PI controller based on the stator-flux orientation control.

Dual-Loop Power Control for Single-Phase Grid-Connected Converters with LCL Filter

Peng, Shuangjian,Luo, An,Chen, Yandong,Lv, Zhipeng The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.4

Grid-connected converters have widely adopted LCL filters to acquire high harmonic suppression. However, the LCL filter increases the system order so that the design of the system stability would be complicated. Recently, sole-loop control strategies have been used for grid-connected converters with L or LC filters. But if the sole-loop control is directly transplanted to grid-connected converters with LCL filters, the systems may be unstable. This paper presents a novel dual-loop power control strategy composed of a power outer loop and a current inner loop. The outer loop regulates the grid-connected power. The inner loop improves the system stability margin and suppresses the resonant peak caused by the LCL filter. To obtain the control variables, a single-phase current detection is proposed based on PQ theory. The system transfer function is derived in detail and the influence of control gains on the system stability is analyzed with the root locus. Simulation and experimental results demonstrate the feasibility of the proposed control.

Dual-Loop Power Control for Single-Phase Grid-Connected Converters with LCL Filter

Shuangjian Peng,An Luo,Yandong Chen,Zhipeng Lv 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.4

Grid-connected converters have widely adopted LCL filters to acquire high harmonic suppression. However, the LCL filter increases the system order so that the design of the system stability would be complicated. Recently, sole-loop control strategies have been used for grid-connected converters with L or LC filters. But if the sole-loop control is directly transplanted to gridconnected converters with LCL filters, the systems may be unstable. This paper presents a novel dual-loop power control strategy composed of a power outer loop and a current inner loop. The outer loop regulates the grid-connected power. The inner loop improves the system stability margin and suppresses the resonant peak caused by the LCL filter. To obtain the control variables, a single-phase current detection is proposed based on PQ theory. The system transfer function is derived in detail and the influence of control gains on the system stability is analyzed with the root locus. Simulation and experimental results demonstrate the feasibility of the proposed control.

분산전원용 인버터의 유효 무효전력 감결합을 통한 PQ제어 과도상태 특성개선

최철훈(Chul-Hoon Choi),최종우(Jong-Woo Choi),이창희(Chang-Hee Lee) 전력전자학회 2012 전력전자학회 논문지 Vol.17 No.5

Grid-Connected Fuel Cell System Based on a Boost-Inverter with a Battery Back-Up Unit

M. Jang,M. Ciobotaru,V. G. Agelidis 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5

In general, two power conversion stages are required when low-voltage unregulated fuel cell (FC) output is conditioned to generate AC power. In this paper, the boost-inverter topology that achieves both boosting and inversion functions in a single-stage is used as a building block to develop a single-phase grid-connected FC-system which offers high conversion efficiency, low-cost and compactness. The proposed system incorporates additional battery-based energy storage and a DC-DC bi-directional converter to support the slow dynamics of the FC. The single-phase boost-inverter is voltage-mode controlled and the DC-DC bi-directional converter is current-mode controlled. The low-frequency current ripple is supplied by the battery which minimizes the effects of such ripple being drawn directly from the FC itself. Moreover, this system can operate either in a grid-connected or stand-alone mode. In the grid-connected mode, the boost-inverter is able to control the active (P) and reactive (Q) power using an algorithm based on a Second Order Generalized Integrator (SOGI) which provides a fast signal conditioning for single-phase systems. Analysis, simulation and experimental results from a laboratory prototype are presented to confirm the validity of the proposed system.

PQ Control of Micro Grid Inverters with Axial Voltage Regulators

Yang Chen,Jinbin Zhao,Keqing Qu,Fen Li 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.6

This paper presents a PQ control strategy for micro grid inverters with axial voltage regulators. The inverter works in the voltage-controlled mode and can help improve the terminal power quality. The inverter has two axial voltage regulators. The 1st regulator involves the output voltage amplitude and output impedance, while the 2nd regulator controls the output frequency. The inverter system is equivalent to a controllable voltage source with a controllable inner output impedance. The basic PQ control for micro grid inverters is easy to accomplish. The output active and reactive powers can be decoupled well by controlling the two axial voltages. The 1st axial voltage regulator controls the reactive power, while the 2nd regulator controls the active power. The paper analyses the axial voltage regulation mechanism, and evaluates the PQ decoupling effect mathematically. The effectiveness of the proposed control strategy is validated by simulation and experimental results.