Island type micro-power-grid energy storage control method based on consistency algorithm
A technology of energy storage control and micro-grid, which is applied in the direction of AC network load balancing, single-network parallel feeding arrangement, etc., which can solve communication bottlenecks and cannot effectively deal with micro-grid topology changes and other issues
Inactive Publication Date: 2015-11-18
XI AN JIAOTONG UNIV +1
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However, this control method has communication bottlenecks, hidden safety hazards in the central management system, and cannot effectively deal with changes in the topology of the microgrid.
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[0038] The present invention will be further described below in conjunction with drawings and embodiments. But the content of the present invention is not limited thereto.
[0039] see figure 1 , a hybrid energy storage control strategy based on the consensus algorithm and considering the state of charge limitation. The specific steps of the control strategy are as follows:
[0040] Step 1: Detect the actual state of charge of the supercapacitor and its output power to the microgrid;
[0041] Step 2: Determine whether the state of charge of the supercapacitor reaches the limit;
[0042] refer to figure 2 , when the state of charge of the supercapacitor reaches the limit value, the state management system will switch the entire microgrid to the state-limited operation mode. In this mode, the actual reference output power of the super capacitor is obtained by the following formula:
[0043] P S C r ...
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The invention provides an island type micro-power-grid energy storage control method based on a consistency algorithm. The method includes the steps: detecting the charge state of a super capacitor and the power the super capacitor is output to a micro-power-grid; determining whether the charge state of the super capacitor reaches a limit value, and triggering a state limit outer ring to make the micro-power-grid run in a state limit mode if the charge state of the super capacitor reaches the limit value, otherwise, the micro-power-grid runs in a normal mode; calculating the total reference output power of a storage battery through a self-adaptive control inner ring on the basis of the actual reference output of the super capacitor in different running modes; sharing the total rated power of a storage battery in the micro-power-grid and the total reference output power of the storage battery through the consistency algorithm; and through the shared information, guiding the output power by the storage batteries according to the proportion of the rated power of each battery member to the total rated power of the storage battery. Distributed control over the micro-power-grid can be achieved. Meanwhile, the control method helps to solve the problem that a conventional hybrid energy storage control strategy cannot effectively handle a situation that the electric quantity stored by an energy storage element is too high or too low.
Description
technical field [0001] The invention relates to a method for coordinating and controlling power sources in a microgrid, in particular to an island-type microgrid energy storage control strategy based on a consensus algorithm. Background technique [0002] In an island-type microgrid composed of supercapacitors, battery packs, photovoltaic arrays, wind generators and diesel generators, the output power of photovoltaic arrays and wind generators is greatly affected by climate conditions, which will cause fluctuations in the supply and demand of power in the system. balance. When the supercapacitor is used as the main power supply, once the supply and demand of electric energy are frequently unbalanced, it will lead to a sharp change in the state of charge of the supercapacitor. [0003] Conventional hybrid energy storage control strategies generally have relatively simple means, and are often based on the fact that the energy storage elements are all in a schedulable state, a...
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IPC IPC(8): H02J3/38H02J3/28
Inventor 王建学李昊罗南星李爽祝振鹏刘世民
Owner XI AN JIAOTONG UNIV