Analysis of Four-Quadrant Control Characteristics and Parameter Design of Inertia Synchronized Three-Phase PWM Converter

doi:10.16183/j.cnki.jsjtu.2024.094

Abstract

Abstract:

One of the mainstream schemes for grid-forming control in new energy power generation units is the inertia synchronization control for pulse width modulation (PWM) converters (ISynC-converter). However, existing research primarily focuses on the control characteristics in inverter mode, while studies on its four-quadrant control characteristics and parameter design methods for system control remain insufficient. To address these issues, a linearized model of the ISynC-converter is first established considering the pre-synchronization stage, and the frequency-domain analytical equations for direct current (DC) voltage-phase angle and reactive power-voltage are developed. Then, a design method for key control parameters in the DC voltage loop and reactive power loop is proposed. Finally, the feasibility of the proposed method is verified through simulations and experiments, and the four-quadrant control characteristics as well as inertia support capability are analyzed. The results indicate that the DC voltage and reactive power loops of the ISynC-converter exhibit strong coupling in all four-quadrant operating regions, leading to significant reactive power fluctuations during DC voltage disturbances. Additionally, while the ISynC-converter demonstrates inertia support capability, its effect is limited due to the low inertia contribution of the DC capacitor. These findings provide a foundation for further research on decoupling control between the DC voltage and reactive power loops, as well as strategies to enhance inertia support capabilities.

Key words: pulse width modulation (PWM) converter, inertia synchronization control (ISynC), parameter design, control characteristics

CLC Number:

TM461.5

GUO Ziteng, WANG Han, WANG Fuwen, CAO Yunfeng, ZHANG Jianwen, CAI Xu. Analysis of Four-Quadrant Control Characteristics and Parameter Design of Inertia Synchronized Three-Phase PWM Converter[J]. Journal of Shanghai Jiao Tong University, 2026, 60(2): 277-288.

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参数	取值	参数	取值
U_DC/V	30	C/μF	8×330
U_g/V	11.5	电网频率,f/Hz	50
S_B/W	22.5	K_pss	1
开关频率,f_sw/kHz	10	K_pq	0.0488
T_d/μs	2	K_iq	1.3329
X/Ω	0.346	K_pDC	0.1013
R/Ω	0.315	K_iDC	0.5748