scholarly journals The Control Parameter Determination Method for Bidirectional DC-DC Power Converters Interfaced Storage Systems Based on Large Signal Stability Analysis

Electronics ◽  
2019 ◽  
Vol 8 (9) ◽  
pp. 1018 ◽  
Author(s):  
Liu ◽  
Bian ◽  
Cao ◽  
Zhang ◽  
Meng
Keyword(s):  
Control Parameter ◽  
Power Converters ◽  
Storage Systems ◽  
Parameter Determination ◽  
Determination Method ◽  
Large Signal ◽  
Signal Stability ◽  
Dc Power ◽  
The Stability ◽  
Storage Units

In DC microgrid (DC-MG), the loads connected with converters under strict control areconsidered as CPLs (constant power loads). When the voltage of CPLs decreases, the currentincreases and the negative impedance characteristic of CPLs cause instability easily. Fortunately,appropriate control for energy storage units could improve the system stability. However, mosttraditional control methods for bidirectional DC-DC power converters (BDC) connected withbattery storage units do not quantitatively consider the stability influences of control parameters.This paper quantitatively analyzes the stability influence of the BDC current-mode controlparameters and the negative impact of CPLs and derives the control parameter determinationmethod for BDC interfaced storage systems. Large signal stability constraints are obtained in termsof mixed potential function. According to the constraints, the large signal stability is improved whenthe BDC control parameter kp increases, while the stability is degraded when the power of CPLsincreases. The control parameter determination method is very effective and convenient to apply,and the appropriate parameter kp for BDC is determined. The regions of asymptotic stability (RAS)identify that the proposed control parameter determination method could improve the systemstability effectively. The determination method is fully verified by the simulation and experimental results.

Large-Signal Stability Analysis of DC Power System With Shunt Active Damper

2016 ◽  
Vol 63 (10) ◽  
pp. 6270-6280 ◽  
Author(s):  
Hye-Jin Kim ◽  
Sang-Woo Kang ◽  
Gab-Su Seo ◽  
Paul Jang ◽  
Bo-Hyung Cho
Keyword(s):  
Stability Analysis ◽  
Power System ◽  
Large Signal ◽  
Signal Stability ◽  
Dc Power ◽  
Active Damper

scholarly journals Large-Signal Stability Criteria in DC Power Grids With Distributed-Controlled Converters and Constant Power Loads

2020 ◽  
Vol 11 (6) ◽  
pp. 5273-5287
Author(s):  
Fangyuan Chang ◽  
Xiaofan Cui ◽  
Mengqi Wang ◽  
Wencong Su ◽  
Alex Q. Huang
Keyword(s):  
Power Grids ◽  
Stability Criteria ◽  
Large Signal ◽  
Constant Power ◽  
Signal Stability ◽  
Dc Power ◽  
Constant Power Loads

Averaged models of pulse-modulated DC-DC power converters. Part II. Models based on the separation of variables

2012 ◽  
Vol 61 (4) ◽  
pp. 633-654 ◽  
Author(s):  
Włodzimierz Janke
Keyword(s):  
Power Converters ◽  
Averaging Method ◽  
Separation Of Variables ◽  
Small Signal ◽  
Large Signal ◽  
Dc Power ◽  
Switch Mode ◽  
Standard Models ◽  
Averaged Models ◽  
The Ideal

Abstract The separation of variables approach to formulate the averaged models of DC-DC switch-mode power converters is presented in the paper. The proposed method is applied to basic converters such as BUCK, BOOST and BUCK-BOOST. The ideal converters or converters with parasitic resistances, working in CCM and in DCM mode are considered. The models are presented in the form of equation systems for large signal, steady-state and small-signal case. It is shown, that the models obtained by separation of variables approach differ in some situations from standard models based on switch averaging method.

scholarly journals Lyapunov-Based Large Signal Stability Assessment for VSG Controlled Inverter-Interfaced Distributed Generators

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2273 ◽  
Author(s):  
Meiyi Li ◽  
Wentao Huang ◽  
Nengling Tai ◽  
Moduo Yu
Keyword(s):  
Transient Stability ◽  
Stability Domain ◽  
Assessment Method ◽  
Stability Assessment ◽  
Large Signal ◽  
Machine Model ◽  
Signal Stability ◽  
Distributed Generators ◽  
Linearized Stability ◽  
The Stability

Inverter-interfaced distributed generators (IIDGs) have been widely applied due to their control flexibility. The stability problems of IIDGs under large signal disturbances, such as large load variations and feeder faults, will cause serious impacts on the system. The virtual synchronous generator (VSG) control is an effective scheme for IIDGs to increase transient stability. However, the existing linearized stability models of IIDGs are limited to small disturbances. Hence, this paper proposes a Lyapunov approach based on non-linearized models to assess the large signal stability of VSG-IIDG. The electrostatic machine model is introduced to establish the equivalent nonlinear model. On the basis of Popov’s theory, a Lyapunov function is derived to calculate the transient stability domain. The stability mechanism is revealed by depicting the stability domain using the locus of the angle and the angular frequency. Large signal stability of the VSG-IIDG is quantified according to the boundary of the stability domain. Effects and sensitivity analysis of the key parameters including the cable impedance, the load power, and the virtual inertia on the stability of the VSG-IIDG are also presented. The simulations are performed in PSCAD/EMTDC and the results demonstrate the proposed large signal stability assessment method.

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