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Jia X.,Tsinghua University | Zhong H.,Tsinghua University | Xia Q.,Tsinghua University | Ding M.,Ningxia Electrical Power Dispatching and Communication Center | Ning B.,Ningxia Electrical Power Dispatching and Communication Center
Dianwang Jishu/Power System Technology | Year: 2013

In view of the demand on improving the efficiency of asset utilization, the effective transmission congestion management in smart grid becomes much more important. Under the market mechanism integrated with locational marginal price (LMP) and the background of two-level market with two-settlement in day-ahead and real-time market, it is proposed that the transmission congestion surplus should be used to mitigate the congestion of transmission lines; and combining with the characteristics of the shadow price of congested lines and demand side price elasticity coefficient, it is proposed to lead in the LMP-redispatch cost factors (L-R Factors) as the foundation of measuring the impact of LMP variation on redispatch cost of power grid. On this basis, a coupon mechanism, in which the day-ahead congestion surplus is taken as the source of funds to motivate more demand response (DR) on shifting loads between different periods and then alleviate the congestion in real-time markets, is put forward, and an effective approach for congestion management is formed. Case study based on extended IEEE 30-bus system show that both the proposed mechanism and method are effective.


Xia Y.,Tsinghua University | Kang C.,Tsinghua University | Ning B.,Ningxia Electrical Power Dispatching and Communication Center | Ding M.,Ningxia Electrical Power Dispatching and Communication Center
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

In view of the challenge by the system peak-valley difference due to the large-scale wind power anti-peak-regulation characteristic and air-conditioning load to both the economy and security of power system operation, a new interactive mode of voluntarily declaring power consumption willingness and peak-load shifting cost is designed. The interactive mode is based on an analysis of load shifting potential of commercial and industrial customers. Based on this mode, a load model of interactive customer fully reflecting customer willingness on the customer side is developed. A generation and load integrated scheduling model is built by embedding the load model of interactive customer into the traditional security constrained unit combined model. The load model of interactive customer can participate in power network operation as scheduling resources, reducing the cost of expensive generator start and stop as well as the operation cost of the power system. New England 39-bus system validates the effectiveness of the proposed mode and model. © 2012 State Grid Electric Power Research Institute Press.


Xia Y.,Tsinghua University | Kang C.,Tsinghua University | Ning B.,Ningxia Electrical Power Dispatching and Communication Center | Ding M.,Ningxia Electrical Power Dispatching and Communication Center
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

Based on the interaction mode on customer side, the generation and load integrated static security checking mode and model are developed. In this mode, both the generation and demand side interactive resources can be optimized at the same time to improve the security performance of system after N-1 contingency in the stressed cases. In response to computational difficulties brought by N-1 contingency constraints and interaction loads in large scale systems, a decomposition algorithm with identification method of active interaction integer variables is proposed, and the optimization space as well as the computation complexity of the mix-integer program problem can be effectively reduced by using this algorithm. The effectiveness of the model and algorithm proposed are demonstrated by numerical experiments on a New England 39-bus system. © 2012 State Grid Electric Power Research Institute Press.


Jia X.,Tsinghua University | Xia Q.,Tsinghua University | Chen Q.,Tsinghua University | Ding M.,Ningxia Electrical Power Dispatching and Communication Center | Ning B.,Ningxia Electrical Power Dispatching and Communication Center
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2013

In order to integrate the incentives from demand side response to promote investment efficiency of power generation, a novel concept of "effective capacity cost" is proposed for power generation and corresponding mathematical models are developed. On this basis, the "effective capacity cost" for different periods is calculated according to the shape of yearly load duration curve, and then is shared between electricity consumers according to their consumption behaviors. Afterwards, an implementation mechanism is designed for practical application. The mechanism calculates the price for generation capacity, which would be integrated as an important component in the end-user electricity price. Finally, a numerical example of simulation of the mechanism implementing process is investigated. The example is based on actual installed capacity and load data of a power system in a province of China in 2010. The results demonstrate the effectiveness of the proposed model, method and mechanism. © 2013 State Grid Electric Power Research Institute Press.

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