1082 / 2019-05-20 14:44:05

New energy accommodation and interaction technology based on load Sequential decomposition

source-grid-load coordination, accommodation capability evaluation, interaction load, observable decomposition, controllable response

With the large-scale wind power penetration,the power balance of source-grid-load system was changed. For power system operation and control, two kinds of uncertainty and unknown variables appeared in the balance equation, namely large-scale intermittent wind power and load. It’s the key of the paper, that the uncertaintyload was transparently solved.Firstly,the wind power accommodation capability evaluation was established, the systemaccommodationcapabilitywas quantitative evaluated.The key factorsof source-grid-load accommodation were analyzed. Secondly,for interaction load, feature identification function was proposed, the interaction loadobserverwas established; the interaction load controller was established,which consistedof discrimination matrix and peak-valley interaction model. Thirdly,the integral control of interaction load was designed by inner-outer control loop. Based on the actual grid, focusing onsource-grid-load coordinationand the interaction load response, the effectiveness of the proposed solution measures was verified through simulation.
In this paper, the wind power capacity of the target power system was quantitatively solved by establishing the evaluation index of wind power acceptance ability. In the paper, the key factors of coordinating source-grid-load were analyzed. In order to estimate the contribution capacity of the source-grid-load, for the acceptance of wind power, the relative degree of the contribution was calculated quantitatively. Based on the principle of source-grid-load interaction, the theoretical model of interactive load observer and controller was proposed, and the internal and external control loops were designed to construct the intelligent control structure of interactive load. The applied theory and method were applied to the Liaoning regional power grid. According to the typical day of winter acceptance, the contribution degree of the wind power acceptance ability was quantitatively calculated. Then, using the proposed method, the load curve was modified by the feature observation and interaction control, and the operation mode of the source-grid-load was optimized, which effectively improves the wind accommodation of the regional power grid. Ultimately, the load Sequential decomposition was verified as the key technology of the new energy friendly-grid.