A multi-level control method for AC-DC hybrid microgrid with high proportion of photovoltaic access
An AC-DC hybrid and control method technology, applied in the field of AC-DC microgrid control, can solve the problems of photovoltaic uncertainty, photovoltaic output uncertainty, uncontrollable power grid and other problems, so as to improve flexibility and controllability and solve the problem of uncontrollable influence. Effect
Active Publication Date: 2022-07-05
SOUTHEAST UNIV +1
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Problems solved by technology
Solve the uncontrollable impact of photovoltaic output uncertainty on the power grid, and use scene analysis technology to deal with photovoltaic uncertainty
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[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0048] According to the idea of multi-level coordinated control, this application controls the "power supply, grid, load, energy storage" elements in the system according to the respective control objectives of different levels. Firstly, the uncertainty of photovoltaics is considered, in which the power estimation error of photovoltaic output obeys the distribution function, and the Latin hypercube sampling method is used to sample ...
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The invention discloses a multi-level control method for an AC-DC hybrid micro-grid connected to high-proportion photovoltaics. According to the uncertainty of photovoltaic output, a typical scene set is generated, and the photovoltaic and energy storage devices are bundled as a control subject to complete the control of level 1; the PET control mode is set according to the network type connected to the PET port, and the control variables of the PET port are adjusted to complete the control. Level 2 control; according to the control result of level 1, other flexible and controllable resources in the upper power grid area are adjusted to complete the control of level 3. The invention has strong flexibility and practicability, takes into account the uncertainty of photovoltaic output, system voltage quality and operation economy, sets different control targets for different levels in the AC-DC hybrid microgrid, and uses each microgrid area. The ability of autonomous operation, simplifying the control difficulty, and realizing the interconnection, interaction and coordinated control between the microgrid areas.
Description
technical field [0001] The invention belongs to the technical field of AC-DC micro-grid control, and in particular relates to a multi-level control method for an AC-DC hybrid micro-grid with high proportion of photovoltaic access. Background technique [0002] In recent years, with the rapid growth of photovoltaic penetration, the operation of active distribution grids has become complicated. Photovoltaic power generation is affected by the intensity of solar radiation, and its output has strong randomness, intermittency and volatility. When its access ratio is high, it will affect the peak regulation, frequency regulation, backup, power flow, and bus voltage of the power grid. greater impact. How to improve the utilization rate of photovoltaics while ensuring the economical and stable operation of the power grid has gradually become a research hotspot. [0003] The electrical energy generated by photovoltaic power generation is mainly in the form of direct current. At the...
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IPC IPC(8): H02J3/02H02J3/06H02J3/28H02J3/38
CPCH02J3/02H02J3/06H02J3/28H02J3/381H02J2203/20H02J2300/24Y02E70/30
Inventor 李春来石旭江安娜杨立滨李正曦刘宇周万鹏刘庭响张海宁
Owner SOUTHEAST UNIV