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This paper explores the feasibility of transient simulations power system based on discrete event system (DEVS), where the Quantized State System (QSS) algorithm is used for numerical integrations. An induction machine model based on DEVS formalism is built up. Moreover, to guarantee the efficiency and accuracy of transient simulations based on QSS, an algorithm for optimal selection of quantum is...
With the development of power industry, the scale of power system is much larger and power system operations are becoming increasingly complicated and critical. In allusion to this situation, power system specific training for power system dispatcher is necessary and indispensable. Dispatcher Training Simulator (DTS) is a widely used tool for dispatcher training and evaluation. However, there exist...
This paper studied power and hour capacity requirement for energy storage by two approaches. First one is evaluations without constrained condition of power and hour capacity with 80 sets of maximum ramp rates and time windows. And second one is evaluations with constrained condition of power and hour capacity for 2 grid codes (less than 0.1pu change of wind farm (WF) capacity in 20min time window,...
Model accuracy of wind farms is the key factor to investigate the mutual influences between them and a power grid. However, this problem has not been well solved, especially in how to apply the real measurements to validate the models of wind farms. This paper presents a model validation methodology for wind farm via the hybrid data dynamic simulation. First, several typical hybrid data simulation...
This paper presents the EMTP modelling of mechanical DC CB for transmission applications. Modelling structure of a mechanical DC CB is firstly presented with all the main components included. A theoretical background for dimensioning main components is provided. The control logic for each subunit and the interlocks between different subunits are modelled. A self-protection is also modeled to trip...
For disadvantages such as plenty of low level risk factors, strong fuzzy characteristics and regional differences between urban and rural areas in traditional distribution network fault risk assessment, a comprehensive risk assessment method with multi-factor influence and multi-region effect is proposed to describe different influence on fault risk assessment for distribution network based on rough...
Planning and construction of charge stations are important aspects of promoting the development of electric vehicles (EVs). Integrated with the equilibrium traffic flow, a comprehensive optimization strategy aiming at achieving siting and sizing planning of charging stations on the road network is presented in this paper. The system optimization model is used for generating and assigning the equilibrium...
Distributed generations (DG) are the trend for solving the energy crisis and environment problems. Employing DG in a distribution network has an impact on the power flow, power losses, voltages, and so on. These influences are highly correlated to the location of DG. Besides, the DG integrates into power grid would produce certain amount of carbon dioxide emissions, thus affecting the environment...
In order to make the DC voltage of high voltage direct current system based on modular multilevel converter (MMC-HVDC) rise to the rated value smoothly and quickly, the novel closed-loop precharge control strategy is put forward with respect to DC side voltage and AC side voltage. Adopting current closed-loop feedback control to regulate a constant charging current, two control strategies can effectively...
Electric vehicles (EVs) is an attractive solution to replace traditional petrol cars. The penetration of EVs posts a challenge for power systems since it would inevitably incur undesirable voltage drops. EV load shedding can be performed to regulate the grid voltage. The EV charging location is also an important factor when shifting the EV loads. This paper presents a new schedule-controlled framework...
Power systems around the world are impacted by increasing penetration of Distributed Generations (DGs), which, in many cases, results in higher fault current levels. In some cases the increased fault current level may exceed the rating of the existing Circuit Breakers (CBs). Since fault current levels are, to a large extend, influenced by the network parameters and topology, which are not easily changed,...
As doubly fed induction generators (DFIGs) are connected to the power system by the converters which decouple the rotor speed and the grid frequency, high penetration of DFIG- based wind farms may cause the lack of power system equivalent rotation inertia and primary frequency control contribution. In order to improve the DFIGs' contribution to system frequency regulation, this paper presents a new...
The Partitioned-based Moving Horizon Estimation (PMHE), developed previously by others, is applied to the power system state estimation problem in this paper. The constraints on state variables and noises are taken into account in this scheme. In this distributed approach, the network is partitioned into several non-overlapping and observable areas. The global Jacobian matrix is required during the...
Due to significant development of renewable energy sources, such as wind and photovoltaic (PV), conventional synchronous generators are being economically replaced from the traditional generation mix. Modern wind turbine and PV generators are non-synchronous machines, which usually do not provide inherent inertia and governor control to arrest frequency excursion after a major disturbance. Thus, presence...
Demand side management (DSM) has considerable potential to reduce power system generation, transmission and distribution costs. However, the integration of DSM into existing restructured electricity markets is not straightforward. Here, major areas of research into DSM will be reviewed, and the elements of most interest identified, particularly in the context of the Australian National Electricity...
Both in theory and practice show that in the initial stage of power system carbon emission market construction, the free allocation of initial carbon emission allowance is the best choice. In practical situations, a variety of equity principles have been applied in different allocation problems, however, conflicts always exist among these principles. It is necessary to coordinate different allocation...
This paper proposes a wind power forecasting model based on the empirical mode decomposition (EMD) and the support vector machine (SVM). In this model, the EMD is used to decompose wind power sequence into several intrinsic mode functions (IMF) and a residual component. Then, the SVM is used to train each component for the optimal parameters and kernel function. Finally, sum the prediction results...
The penetration level of renewable energy generation has been increasing in some actual power systems, and hence introduces some new problems and even challenges for transmission system planning. In modern transmission system planning, it is necessary to consider the accommodation capability of renewable energy generation, in addition to the traditional requirement for power system reliability. Given...
Distribution utilities are facing challenges arising from rapid technology developments coupled with strong drivers to minimize operating and capital expenditures. Embedded generation including solar rooftop PVs and other demand management means do not only change the demand profile of the system but also other electrical characteristics of the distribution network. Advanced power system analysis...
This paper presents optimal generation scheduling for minimization of fuel consumption (FC) in a typical offshore support vessel with DC power system architecture employing four identical diesel generator (DG) sets. FC is analyzed for (i) equal load sharing among DGs in AC architecture, (ii) equal load sharing among DGs in DC architecture and (iii) optimal load sharing among DGs in DC architecture...
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