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Reactive power and voltage control is the important technical means to improve the voltage quality and reduce the active loss of power grid. It is hard to regulate the voltage and reactive power of Guizhou power grid by manual operation. In this paper, adopting to the successful experiences in automatic voltage control (AVC) system of several power companies in Europe and China, a new decomposition...
By dividing the global area into several control areas, a multi-objective coordinated AGC control method is introduced in this paper. The main control area's objective is the ACE of global area. The sub-areas maintain the power flow of transmission lines among areas at scheduled interchange and cooperate with the main area in emergency. AGC system based on the addressed method can realize multi-objective...
Smart-grid technologies focus on the complex interactions between different components of the electricity grid, together with the computing, control and communication functionalities that will bring together this future smarter infrastructure. Investigating these complex dynamic interactions is crucial for the efficiency and robustness of the emerging smart grid.
This paper focuses on optimal operation schedule of a Microgrid that is interconnected to the power grid. We develop a mathematical model to compute the optimal operation schedule that embodies demand response. Integer Programming optimization is used to this end. Our model incorporates the electricity load into three types: fixed, transferable, and user-action loads. The transferable load plays a...
This paper proposes a method for online monitoring the primary frequency regulation performance of the control area in wide area measurement system (WAMS) based on the dynamic measurement data collected by synchronous phasor measurement unit (PMU). First, it discovers the variation through watching over the power grid frequency and the tie-lines power between control areas in real time. It measures...
Installation of a large number of small sources called distributed generation creates many problems in proper control of national (and European) power grid. At the same time new technologies especially power electronics and measurement data computing associated with smart grid allows to use better and conscious these distributed sources. This paper describes what problems the distributed generation...
According to the management and assessment rules about reactive power ancillary services of power plants, the data of reactive power ancillary services in Yunnan power grid is counted. Based on the reactive power ancillary services management method of China Southern Power Grid, the paper puts forward some targeted suggestions, which have certain reference function on improving reactive power ancillary...
The tie-line power oscillation of two-area interconnected system after power impact is derived strictly. The dynamic equations before the disturbance and after the disturbance are constructed and the variation of the tie-line power is derived. Based on the theory of distribution of impact power in power systems, the tie-line power of two-area system after power impact is derived. The expressions of...
According to the management rules about spinning reserve ancillary services in CSG(China Southern Power Grid Co., Ltd.), the date of spinning reserve ancillary services in Yunnan power grid is counted, it's found that the current compensation capacity algorithm is not well reflect the spinning reserve demand of the grid side. This paper proposes the concept of the validity coefficient of spinning...
According to the structure characteristic analysis of the shipboard power network, a new analysis method based on the data structure of ‘Tree’ is presented firstly for the shipboard power network. In terms of the features of the shipboard power network, the shipboard power network is divided to two levels as power supplying network and power distribution network. The connected component of the power...
In many countries, electricity generation stations are interconnected with a system called power grid which allows the electricity generated in one place to be sent to users in another place. Electric dispatching center is able to reroute electricity to where it is needed. Any generation company (GenCo) has the right to join the market if they want in order that they are able to compete with each...
Based on the complex network theory, this paper proposes a weighting parameters based on the voltage and reactance of the transmission lines, and a new method to measure the vulnerability of power grid through the betweenness index. This paper gives a new weight formula and a algorithm to identification of vulnerable lines. The analysis has been carried out on the IEEE5bus system, which confirms the...
This paper proposes a vehicle-to-grid (V2G) system which integrates with renewable energy sources such as wind power and photovoltaic power. Moreover, a multilayer AC grid including power grid layer and gridable vehicles aggregation layer is established. V2G control which refers to smart charging-discharging strategy and load frequency control is introduced in this paper. And it is simulated by Matlab/Simulink...
The first decade of the twenty first century saw the Indian electricity sector witnessing fast paced structural changes. Regulatory intervention and policy thrusts have been the significant drivers of this change. The utilities have also adapted to these changes. This paper outlines the various milestones crossed in the first decade and the newer challenges that the Indian electricity grid has to...
Protection security assessment of power grids is getting an important task in the course of a decarbonized power generation and a competitive energy business. The analysis of past blackouts studied by the North American Electric Reliability Council (NERC) shows that protection relays are involved in about 75% of all major disturbances. Protection security assessment can be investigated under two different...
We introduce a new microscopic model of the outages in transmission power grids. This model accounts for the automatic response of the grid to load fluctuations that take place on the scale of minutes, when the optimum power flow adjustments and load shedding controls are unavailable. We describe extreme events, initiated by load fluctuations, which cause cascading failures of loads, generators and...
In this paper, we propose a multi-agent methodology (MAM) for power system monitoring and protection. The uniqueness of the proposed architecture is the ability of MAM to evolve in the wake of an attack of malicious intent by mutation and thus always monitoring a power system bus remotely. Also, the architecture interacts with the mutated agents use a voting methodology thus alleviating the effect...
A novel curve fitting method based on the grey Verhulst model for perturbed trajectory prediction of post-fault rotor angle is presented in this paper. For avoiding self-error in the model, the unbiased grey model is realized. An error correction scheme is proposed for improving the prediction precision by using two new coming phasor measurements to predict the error. Compared with the trigonometric...
Influenced by the energy crisis and environmental stress, wind power is growing rapidly for its mature technology and good economic returns. East China Power Grid is planning to construct million kW level wind power base in northern Jiangsu coastal areas. As one kind of intermittent energy, wind power's output changes as wind speed. When wind power is in a small proportion of total power generation,...
This paper presents the security and stability study of planning UHVAC/DC hybrid transmission system using digital and analog hybrid real-time simulation. The building of digital electromagnetic transient and physical simulation models of planning UHVAC/DC power grid was introduced, then detailed simulation of UHV power backbone was presented. The study include as following: Single Fault, Critical...
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