The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents a unit commitment problem with uncertain loads and wind power. A chance-constrained two-stage stochastic program programming formulation is proposed for the stochastic day-ahead scheduling. The loss of load probability (LOLP) and the probability of wind power utilization less than certain level, referred to as loss of wind probability (LOWP), and transmission line overloading probability...
The capacity planning of a battery energy storage system (BESS) in a wind farm is proposed, which considered a coordinated operational dispatch strategy for a wind farm with BESS. The planning objective is based on the minimum deviation value of wind farm power output as referenced. The most significant advantage in the proposed model is that the lifetime of BESS and forecasting error of wind power...
This paper proposed a method for determining a critical contingency set for detailed power system analysis studies. The K-means clustering is applied to reduce operation scenarios in a power system. The performance indices with and without probabilities of system states are used to rank contingencies. The top contingencies ranked by the proposed performance indices are combined with additional extreme...
With the raise of Global Energy Interconnection, long-distance bulk energy transmission will become more and more common. In the future, multiple HVDC infeed is an important feature of receiving-end power grid in China. To improve security and stability of multi-infeed DC system, the structure of power grid should be comprehensively optimized. A modularized optimization method for power system with...
Over the past decade years, China has seen rapid development in HVDC technologies with the world highest operational voltage of ±800kV commissioned in 2010. By 2013, there are more than 24 HVDC transmission projects commissioned or in operation across China to facilitate bulk transfer of power from western and northern parts of the country to the load centres in the central or eastern regions. A majority...
As its sampling frequency is independent of the scale of the system, Monte-Carlo simulation is widely applied to reliability evaluation of generation and transmission system, which is a complex large system. However, it takes a relatively long period to obtain a higher accurate reliability index. This paper points out that, the combination of Importance sampling method and Discrete Latin Hypercube...
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...
As is well known, the anti-peaking characteristic of wind generation leads to evident curtailments of wind farms. With high energy density and flexible installation position, the battery energy storage system (BESS) can provide a new routine to relax the bottleneck of the peak-load regulation, conducive to the absorption of wind power and the economy of system operation. Therefore, with taking account...
By studying on the coordination between the system reliability level and the EV grid-integration scale, the system acceptance capacity of EVs can be assessed from a new point of view. In this paper, a model for the charging loads of three types of EVs and a coordinated strategy with time-of-use price (TOU) are established. Then, the maximum acceptable capacity, reliability sensitivity and other indicators...
In order to hedge the small-probability high-risk events which power system may face against, it is essential to consider the impact of natural disasters in the power system planning stage. First, this paper establishes the component damage probability model under natural disasters. Second, the system risk assessment based on analytical method is discussed, and the indicators and algorithm for rapid...
To overcome the drawback that wind speed distribution is assumed in the reliability evaluation of wind farms integrated power system, the third-order polynomial normal transformation (TPNT) based non-sequential Monte Carlo simulation method, is proposed to evaluate the reliability of generation and transmission system incorporating wind farms in this paper. When historical data or distribution functions...
Transmission network expansion planning (TNEP) is a key component of power system planning. Two important aspects to be considered in TNEP are economy and security factors, which are always contradictory and affect the benefits of both investment and power demand side, so the balance between these two factors needs to be focused. In this paper, a TNEP model based on coordinated economy and security...
This paper presents a method to assess the impact on system reliability of wind integration, considering coordinated operation with cascade hydropower. The seasonal characteristics of river flows and correlation amongst different wind farms are considered. Time sequential Monte Carlo simulation and Latin Hypercube Sampling techniques are used to preserve the characteristics of the time series of the...
With the planning and constructing of UHV grid in China, some huge thermal plant bases are going to be connected to the receiving grid via UHV transmission lines. Therefore, it is significant and urgent to study the ATC (available transfer capability) of the point-to-grid transmission system quickly for each connection scheme in planning stage. In the paper, firstly, the physical mechanism of ATC...
this paper presents a new type of index for improving the power system economical dispatch from a voltage stability margin perspective. The proposed index is based on normal vector of voltage stability limit surface, which are supplement and enhancement of participation factor. Firstly, the rationality of this index is proved mathematically. Then numerical simulation on IEEE 39 system demonstrate...
Traditionally, candidate lines for the transmission expansion planning are manually selected, which faces great challenges in terms of multi-regional planning and large penetration of renewable energy sources (RES). In this paper, an approach is proposed to select candidate set of transmission lines automatically. The utilization level of RES can be ensured by the created candidate set. Through the...
With the increasing integration of wind farms, not only the fluctuation of wind power, but also the correlations among wind farms should be considered in power system reliability evaluation. A Johnson system based non-sequential Monte Carlo simulation method for reliability evaluation of composite power system with wind farms is proposed. If distribution function of wind speed is not known, but historical...
With the planning and constructing of smart grid and the development of energy storage technology in worldwide, it is significant and urgent to study the power system adjustment and control technology based on energy storage comprehensively and thoroughly. It should be noticed that, because of the rapid development of energy storage technology, the fast adjustment and control technology based on active...
When wavelet variation operation is increased on the basis of standard particle swarm optimization algorithm (SPSO), an innovative hybrid particle swarm optimization algorithm (HPSO) is formed. Based on the HPSO, aiming to the UHV power system containing 1000 kV and 500 kV, we can carry out the coordination optimization of emergency control for transient stability problem, here, the transient stability...
This paper summarizes the international present status of new power transmission technology and FACTS technology, and also analyzes the utilizing prospect of new FACTS technology in China, combined with the long-term planning of the strong and smart power grid in the Twelfth Five-year Program (2011–2015).
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.