Dynamic optimization scheduling method and system for flexible interconnected distribution network

A technology of dynamic optimization and scheduling method, applied in power transmission AC networks, electrical components, circuit devices, etc., can solve problems such as difficulty in adapting to weight selection, and inability to ensure convergence to the global optimal solution.

Active Publication Date: 2019-06-07
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +4
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Problems solved by technology

Using a multi-objective optimization algorithm to solve the problem, when there are multiple local optimal solutions, cannot guarantee to converge to the global optimal solution; using the weighted summation method to solve, it is difficult to adapt to the difficulties brought about by the change of the network operating state to the weight selection

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  • Dynamic optimization scheduling method and system for flexible interconnected distribution network
  • Dynamic optimization scheduling method and system for flexible interconnected distribution network
  • Dynamic optimization scheduling method and system for flexible interconnected distribution network

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Embodiment Construction

[0065] The present invention will be further described below in conjunction with the accompanying drawings.

[0066] The optimal scheduling method for flexible interconnected distribution network based on model predictive control proposed by the present invention mainly includes three links: predictive model, rolling optimization and feedback correction. The prediction model is mainly based on the ultra-short-term prediction data of wind power, photovoltaic and load, combined with the method of voltage sensitivity, to predict the voltage of each node of the distribution network in the prediction time domain, and pass the prediction results to the rolling optimization link. The rolling optimization link takes the deviation between the predicted value and the rated value of each node voltage in the control time domain and the minimum comprehensive power supply cost as the goal, and obtains the dispatching instructions of the multi-terminal back-to-back flexible (MBVH) in the cont...

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Abstract

The invention discloses a dynamic optimization scheduling method and system for a flexible interconnected distribution network. A dynamic optimization scheduling method of a flexible interconnected distribution network based on model prediction control is provided for the uncertainty of renewable energy output and load demands by taking a flexible interconnected distribution network connected witheach feeder through a multi-terminal back-to-back VSC-HVDC. The method comprises the steps of: based on the renewable energy and load ultra-short term power prediction information, establishing a voltage prediction model through calculation of voltage sensitivity of each node, establishing a flexible distribution network optimization operation model to take the minimum of the deviation of a predicted voltage and a rated voltage and the integrated power supply cost by a target, and combining a method of adaptive dynamic weight and feedback correction to optimize and obtain a dispatching instruction value and perform issuing. The method can effectively solve the problem of voltage out-of-limit generated by random fluctuation of the distributed power supply output and load demands and effectively balances the economical efficiency and the safety of the operation of the flexible interconnected distribution network.

Description

technical field [0001] The invention belongs to the technical field of optimal operation of an active distribution network, and in particular relates to a method and system for dynamic optimal dispatching of a flexible interconnected distribution network based on model predictive control. Background technique [0002] The long-term practice of "closed-loop design and open-loop operation" in my country's distribution network not only affects the further improvement of power supply reliability, but also makes it difficult to meet the friendly access of high-penetration distributed generation (DG). Multi-terminal back-to-back VSC-HVDC (MBVH) is the latest development of grid flexible control technology, which can not only realize the long-term safe closed loop operation of any feeder, but also precisely control the power flow distribution between feeders. The flexible interconnection operation of the distribution network is an important way to improve the reliability of power s...

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Application Information

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IPC IPC(8): H02J3/00H02J3/36
CPCY02E60/60
Inventor 葛乐韩华春褚国伟李强吕振华
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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