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To cover its rapidly increasing power demand is one of the biggest challenges of the ASEAN (Association of Southeast Asian Nations) region. But even though ASEAN offers abundant untapped renewable energy sources, its current power generation is strongly based on fossil fuels, mainly due to economic reasons. Trans-border electricity trade could increase economic viability of exploiting renewable energy...
Underground cables are an essential part of the urban electricity grid. However, a disadvantage is that once they reach or even exceed their rated capacity the excessive temperature can considerably shorten the life of their insulation. The ultimate temperature reached is dependent on both the ground temperature and the thermal resistivity of surrounding soil. Modelling the temperature of the core...
To expose operational risk of large-scale wind power integration system, probability distribution functions (PDFs) of input variables are required to model accurately in probabilistic load flow (PLF) analysis. Unfortunately, PDFs are difficult to obtain in reality. Therefore, a PLF method based on modified Nataf transformation and quasi Monte Carlo simulation is proposed in this paper. This method...
Online transient stability assessment (TSA) has always been a tough problem for power systems. One of the promising solutions is to extract hidden stability rules from historical data by machine learning algorithms. These algorithms have not been fully accommodated to TSA, since power system has its special characteristics. To ensure conservativeness of TSA, this paper proposes a synthetic stability...
Focusing on the new power reform, behavioral models of market participants are established in this paper to describe China's power market in the future and risk factors are listed based on the models. For the risk assessment of market participants, "Stress testing" in financial field is applied to China's power market to present how the risk factors impact on the tested factors.
Recent tendencies indicate that new and reconductored power lines are declining from the traditional cross arm mounted overhead connection types. Instead of the traditional connections, underground cables are increasing as it is one of the most popular choices. At the same time, LVABC is another type of overhead cable spreading in distribution networks, which has a bundled property similar to the...
Series compensation is an important way to improve transmission capability and power controllability of long-distance power delivery systems. Since typical series compensators have some limitations, this paper proposes a novel series voltage compensator based on thyristor-controlled transformer. By special configurations of transformer windings and thyristor converters, it is capable of injecting...
High-voltage DC (HVDC) system based on line- commutated converter (LCC) is widespread technology around the world. Reactive power absorption of LCC-HVDC is always problem of the installation in weak system. Because of it, in general, reactive power compensation devices are installed together. If the space where the devices are planned to be installed is not sufficient, it is impossible to install...
To provide 2 types of DC voltage, a bipolar-type DC micro-grid is adopted in this paper. The I-U droop control is proposed to achieve parallel operation of three-level converters in DC micro-grid. To solve unbalance potential of converters, the neutral point potential control is added into the I-U droop control. To eliminate influence of line impedance and improve the accuracy of power distribution,...
Earth Hour is an awareness event that encourages turning off lights and other non-essential energy sources for an hour in March. Advocating to bring attention to the impact of climate change and to reflect on the actions individuals can take to alleviate its effects, this study aimed to assess whether the event resulted in any significant reductions in energy consumption. Examined at both a state...
A clustering method based on k nearest neighbor is proposed for the dynamic equivalent of wind farm in this paper. After dimension reduction, this method can detect boundary points (BPs) of clustering parameters of wind turbines along the border of it. So the training samples and store space are reduced significantly. Initial clustering result is obtained according to the sequence of BPs. Final clustering...
An aggregator undertakes multiple tasks in smart distribution network such as energy trading, grouping and providing market access to demand response (DR) resources, coordinating EV charging, efficiently controlling smart appliances of consumers and communicating with the distribution system operator (DSO). In this context, a bi-level linear programming model is established for an aggregator of day-ahead...
In order to prevent voltage collapse, lots of voltage stability assessments are proposed to search weak buses. However, these assessments are either only related to network topology or time-consumed. Therefore, voltage stability extended voltage sensitivity factor (EVSF), an improved voltage stability assessment considering voltage regulation of generator and HVDC, is given and derived in this paper...
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...
Photovoltaic (PV) panels and electric domestic water heater with storage (DWH) are widely used in households in many countries. However, DWH should be explored as an energy storage mechanism before batteries when households have excess PV energy. Through a residential case study in Queensland, Australia, this paper presents a new optimized design and control solution to reduce water heating costs...
Analyzing power system performance with respect to voltage sags is important for planning and operation. This paper performed a stochastic analysis taking into account the probabilistic characteristic of both fault type and fault impedance to the area of vulnerability (AoV) by using Monte Carlo method. The analysis was applied to the Philippine Luzon Grid. As a result, a more realistic AoV with less...
Installation of single-phase rooftop photovoltaic (PV) systems in low voltage (LV) residential feeders without controlling their ratings and locations may deteriorate the overall grid performance including reversed power flows, high losses and unacceptable voltage profiles. Therefore, in recent years the utilities have adopted limitations on the maximum allowable number of PVs in LV networks. To overcome...
A new simulation technique has been developed for determining oscillatory stability transfer limit of an inter- connector. The small signal sensitivity algorithm calculates the rate of change of small signal oscillatory damping with respect to the change in inter-connector power transfer. The significant level of correlation between the derivative of small signal damping and the small change in power...
This paper presents a validation of selection process for selecting the most effective stabilizing signal to improve damping of inter area oscillations in a multi-machine power system by different signal selection methods. This paper also deals with wide area damping controller scheme compensating time latency of feedback signal in order to damp low frequency inter area oscillations in large power...
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...
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