Power fluctuation smoothening method based on optimum control of energy storage and virtual energy storage
An optimal control and virtual energy storage technology, which is applied in the direction of AC network load balancing, etc., can solve problems such as high cost, small capacity of energy storage equipment, and restrictions on large-scale applications
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Embodiment 1
[0035] A method for smoothing power fluctuations of microgrid tie-lines based on optimal control of virtual energy storage, see figure 1 , figure 2 and Figure 4 , the method includes the following steps:
[0036] 101: Obtain the scheduling reference value of the tie line power on the day through the power prediction value of new energy power generation, uncontrollable load and controllable equipment consumption without control
[0037] Firstly, get the power prediction value of new energy power generation, uncontrollable load and controllable equipment consumption without control in the day before, and then get the dispatching reference value of the tie line power on the day
[0038] 102: Obtain the power generated by new energy at time t of the day (starting from time t=1) to calculate the total power y that needs to be stabilized by the energy storage battery and electric heat pump at that time ref,t ;
[0039] 103: According to the state equation in the optimal co...
Embodiment 2
[0044] The scheme in step 103 in Embodiment 1 is described in detail below in conjunction with specific calculation formulas and examples, see below for details:
[0045] 201: Use the KiBaM (KineticBatteryModel) energy storage battery model to describe the operation of the energy storage battery;
[0046] Among them, use Indicates the target power of the energy storage battery, and the required discharge current I at this moment d for: V rated Indicates the rated voltage of the energy storage battery, N s Indicates the number of energy storage batteries connected in series.
[0047] Suppose at the end of each step q 1 =0, the maximum discharge current I of the energy storage battery d,max for:
[0048] I d , m a x = kq 1 , 0 ...
Embodiment 3
[0092] The following specific experiments are used to verify the feasibility of a method for smoothing power fluctuations of microgrid tie-lines based on virtual energy storage optimal control provided by the present invention. See the following description for details:
[0093] In order to verify the effect of this method, 1000 electric heat pump models were established, and the response characteristic curve of a single electric heat pump is as follows figure 1 As shown, the temperature set point of each electric heat pump is 21°C, the dead zone range is 4°C, and its thermodynamic dynamic parameters C, R, and Q are set to 3599.3J / °C, 0.1208°C / W, and 400W, respectively. The average daily outdoor temperature is 5°C. 100 energy storage battery units are established, and the number of energy storage batteries in each unit is 80, and its rated voltage V rated , the maximum capacity q max , the capacity ratio c of the KBM model, the proportionality constant k of the KBM model, an...
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