This paper proposes a novel framework for optimal planning of integrated energy system (IES) that takes into account its reliability value, which aims at promoting the power grid and IES to share the responsibility of the user's energy-supply reliability by market mechanism, thus promoting IES integration. First, an IES grid-connected electricity purchase price estimation model considering reliability is established, based on price theory and reliability theory, to quantify the reliability incremental value of IES. Then, a two-layer collaborative planning model, containing optimal equipment capacity configuration and strategy determination in the upper layer and optimal operation simulation and IES incremental reliability value in the lower layer, is established to coordinate the reliability guarantee capability of distribution network and IES while maximize the profit of IES. Among them, a practical approach of IES probabilistic reliability calculation is studied, considering double uncertainty and time-series matching of generation and demand, aiming at reducing the complexity of electricity price calculation embedded in planning model. Next, the intelligent krill herd algorithm and MILP are implemented to solve the model. Finally, a case is studied to verify the effectiveness of the model, and analyse the impact of load growth rate and user reliability requirements on the planning results.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
The power electronic device is an integral part of the power system, is directly related to its overall performance, and determines whether the power system can achieve intelligence or not. At the present stage, the power transmission engineers regard the transmission capability of HV AC system as the main concern to ensure stable and reliable operation in power grid. The advantage of the power electronic device is to reduce the uncertainty in the operation of the power system by relying on the DC transmission technology. Based on the simple analysis and introduction of power system and power electronic devices, the application of power electronic devices in power generation, power storage and transmission links is discussed in detail so as to ensure the overall operation quality and efficiency of power system in practice.
At present, in the power system, large scale energy storage technology has gradually become the norm, but, some technical shackles in the development and application lead to power system disturbances, or even normal operation. This paper mainly discusses the current development of power system, energy storage technology and the role and position of all kinds of energy storage technologies and cost. The application prospect of this technology in power system is also analyzed, in order to improve the market competitiveness of power supply, and environmental quality for to achieve sustainable development.
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