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Climate change is likely to impact on already rising household electricity costs. A need exists to better understand current consumption and generation patterns and how they impact economically on a household's electricity bill in Queensland. This paper assesses the impact of the current residential household tariffs and how, depending on the electrical system configuration of the household - namely...
Variable nature of solar PV makes it difficult to maintain an acceptable on-grid behavior of a PV plant under diverse load and network conditions. Battery energy storage (BES) devices are being proposed for making the PV plants behave in a grid-friendly manner. Given the variability of PV power output, a multi-faceted control regime is necessary to cope with different control demands at different...
The traditional methods to solve the PV mismatch problem are using diodes and photovoltaic cells in series and in parallel to compensate voltage and current. Considering the cost of production, it is unrealistic that each photovoltaic cell parallels with one bypass diode. One bypass diode may parallels with dozen or more solar cells. Therefore, the connection of the photovoltaic cells in parallel...
For conventional radial distribution network, the voltage profile of each feeder can be controlled within the reasonable level by adjusting the OLTC transformer terminal voltage and local shunt capacitors. But for active distribution grid, this traditional voltage regulation scheme may fail. Therefore, a novel coordinated voltage control strategy is proposed to regulate voltage of distribution network...
The rapid growth of new energy generation in China today is presenting new challenges for the stability of power grid. Based on the mechanism of voltage-inducting cascading trips of large-scale new energy in centralized system, this paper firstly proposes the definition of trip-off path to describe the detailed process of the failure, and builds the model of trip-off path searching and risk evaluation...
This paper reviews several grid tariff schemes, including flat tariff, time-of-use, time-varying tariff, demand charge and dynamic tariff (DT), from the perspective of the long term incentives. The long term incentives can motivate the owners of flexible demands to change their energy consumption behavior in such a way that the power system operation issues, such as system balance and congestion,...
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,...
Based on risk management theory, a nonlinear programming model for optimizing the coal inventory is developed by taking the CVaR as a risk measuring index while considering the coal-fired power plant's carbon emission constraint and the cost of purchasing a CO2 quota. In the developed model, the objective is to minimize CVaR under a given expected profit. Some uncertain factors are taken into account...
This paper present new voltage instability detection index (QLVIDI) based on reactive power loss using Synchrophasor technology. The proposed index is fast as compare to the already existing Voltage Instability Monitoring Index (VIMI) and Improved Voltage Instability Monitoring Index (IVIMI). The proposed scheme utilizes reactive power losses in the lines in consideration with direction of active...
The proper integration of Microgrid determines the safe, efficient and economic operation of distribution network. From the perspective of the benefits of distribution network, this article illustrates the detailed process of the optimal integration of Microgrid. Firstly, select the candidate set taking consideration of practical engineering aspects. In order to reduce the forecast error, the probabilistic...
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...
As the penetration of wind energy increases in the utility grid, the intermittent nature of wind invariably imposes stress to the utility and creates chaos in scheduling energy dispatch. This situation can be improved to a greater extent by introducing energy storage systems along with the wind generation. The addition of energy storage ensures levelised energy output, supports the grid under fault,...
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.
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...
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...
In this study, as a new index of facilities, business continuity capability on occasion of an energetically isolated operation, was defined and evaluated for the facility with a rich amount of resources such as private generators, a battery energy storage system and a PV generation system. A methodology was proposed to evaluate a duration during which the facility is self- sustaining regarding energy...
The successful islanding operation of distribution system requires an efficient islanding detection technique and under frequency load shedding scheme. The islanding detection technique is necessary to detect accurately the islanding phenomenon and under frequency load shedding scheme is essential to control frequency when the load exceeds the generation. This paper presents a new strategy for successful...
Power system components are susceptible to failures that could result in island formation which is highly undesirable and should be avoided. For a safe and reliable power system operation, all insecure operating states such as critical nodes and sets of candidate transmission links that could cause cascading outages within the networks must be quickly detected and identified in advance. This paper,...
This study assesses the potential impact of high renewable generation on the spot electricity prices, generator revenue and profits in an energy-only electricity market. In particular, it presents modelling outcomes for the Australian National Electricity Market (NEM) with a range of possible renewable penetrations in 2030. It is assumed that the current reliability standard is maintained and participants...
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