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To improve the flexibility and stability of microgrid operation, this paper takes the multi-port power electronic transformer (PET) as the connecting interface of microgrid, and the energy storage system (ESS) at the low voltage DC (LVDC) side is controlled to reduce the influence of load or distributed generation (DG) fluctuations on microgrid. The mathematical models of interface stages are also...
In this paper, the behavior of doubly-fed induction generator (DFIG) under unbalanced grid voltage conditions is analyzed and a control strategy based on complex-vector-resonant regulator is proposed. Compared with the traditional PI regulator, the positive and negative sequence currents can be regulated without sequential-decomposition process and this control structure has strong robustness in parameter...
In a DC Microgrid, the loads are interfaced through power electronic converters. These loads behave as constant power loads (CPLs) when tightly regulated. CPLs have negative incremental impedance which may cause instability. Consequently, the stability analysis is very important to ensure the whole system stable, especially in island mode. This paper investigates the large signal stability of the...
As a significant part of electrical load, air conditioners draw attentions for their sometimes-unfriendly load characteristics, especially their dynamic responses during grid voltage disturbances. In this paper, a novel under-voltage control strategy for variable-speed air conditioners is introduced, which can keep air conditioners load characteristic as constant impedances when unexpected voltage...
When the variable speed wind turbines with virtual inertia are connected to the grid, the transient stability control of the interconnected system will be more flexible. Firstly, the linearized state equation of equivalent two-machine system with wind power was derived, and respective influences of terminal unit inertial changes on the transient stability of power system were analyzed. Secondly, a...
This paper proposes a new control method for enhancement of transient stability of synchronous generators in power system with variable speed wind generators (VSWG). Kinetic energy stored in a rotor of VSWG is actively used for the transient stability enhancement, which is controlled based on responses of the kinetic energy of each synchronous generator in the power system. The effectiveness of the...
A large number of distributed generations (DGs) connected to the distribution network have a significant impact on the stability of the power system due to their low inertia. Meanwhile the DGs are generally linked to the end of the distribution network, where power quality problems are very common. This paper applies virtual synchronous generator (VSG) technology in three-phase four-leg inverter....
The purpose of this paper is to determine the optimal location, size and controller parameters of Static Var Compensator (SVC) to simultaneously improve static and dynamic objectives in a power system. Four goals are considered in this paper including transient stability, voltage profile, SVC investment cost and power loss reduction. Along with the SVC allocation for improving the system transient...
A fractional-order analysis model of the chaotic oscillation in a 4D power system including synchronous generator exciter is presented in this paper. The dynamics of the system are investigated by using this model. Firstly, the minimum order for the occurrence of bifurcations was calculated from the invariant system parameter set. Then, the influence of the parameter variations on the dynamics of...
Microgrid (MG) consists of distributed generation (DG) units, which supply MG loads via the power network. Droop-based control system has been proposed for power sharing implementation among DG units in MGs. The droop control performance is based on the power network variables, which makes it easy to implement. As the control system at the primary level, the droop controller plays a major role in...
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