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This paper explores the frequency instability mechanism in modern power electronics-based power systems. It is revealed that the lack of damping and inertia together with the slow response of the frequency regulator should be responsible for frequency instability issues. As a result, three possible solutions targeting at damping enhancement, inertia emulation, and response acceleration are employed...
Distributed static series compensator (DSSC) is a new type of distributed FACTS devices that can realize accurate control of power flow and enhance voltage stability. Thus, it could be installed in stability-limited transmission systems widely. This paper presents a new capacity control model for DSSCs and deduces the corresponding power flow equations. To illustrate the effect on system power voltage...
Regarding the access of a micro-grid with multiple distributed generation (DG) units into the power distribution network, superconducting fault current limiters (SFCLs) may be used to improve the micro-grid's robustness against short-circuit faults. In this paper, the flux-coupling-type SFCL is selected to play the role, and the optimal allocation of the SFCLs for protection of a micro-grid with wind-PV...
With the development of smart grid, power system communication network and intelligent electrical appliance, grid cyber physical system (GCPS) has come to existence. GCPS is a space-time multidimensional heterogeneous system integrated with cyber system and power system. Construction of GCPS greatly improves the sensibility and controllability of system and devices in power systems, providing not...
This paper investigates the stability regions of current control for LCL-filtered grid-connected converters, where no active or passive damping is required to stabilize the closed-loop control system. It is already identified in the literature that if the LCL resonance frequency is placed within 1/6 to 1/2 of the system sampling frequency, the grid current control can be directly used without damping...
The communication system is the key element in an electric power system that supports its observability and controllability. Communication failures pose serious risks in electric power system operations. It is therefore crucial to study the adverse effects of communication system failures on power system operation. This is especially for wide-area monitoring, control and protection applications where...
With the rapid growth of electric vehicles (EVs), charging large-scale EVs will affect the security and economy of power system operation. When developing the charging strategy, not only technical and economic issues but also the patterns of EVs' utilization should be considered. This paper presents a hierarchical charging strategy for EVs considering both system level and user level benefits, together...
With the implement of unique high voltage transmission lines, the original 500kV and 220kV network will electromagnetically couple with the newly built 1000kV power grid. Multiple electromagnetic loop network could change operating characteristics of power grid, particularly the stability and transmission capacity problems of power grid. Operating problems that happen in 1000kV/500kV/220kV electromagnetic...
Conventionally, rotor angle stability control is based on centralized manner which exposes an increasing number of disadvantages with the growth in size and complexity of power systems. This paper proposes a distributed control method to enhance power system rotor angle stability based on the second-order consensus. In this method, one generator is selected as the leader and the others are followers...
This paper concentrates on the design, control, and implementation of an LCL-filter-based shunt active power filter (SAPF), which can effectively compensate for harmonic currents produced by nonlinear loads in a three-phase three-wire power system. With an LCL filter added at its output, the proposed SAPF offers superior switching harmonic suppression using much reduced passive filtering elements...
A congestion management method considering both voltage stability and economic cost under electric market was proposed. Two steps were included in this method. The load margin was used as a criterion for assessing voltage stability in the first step which was calculated by interior point method. Next, a new criterion called the economic sensitivity of lading margin related to generator (ESMLG) was...
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