Storage capacity optimal allocation method based on improved primary frequency modulation
A capacity optimization configuration and energy storage capacity technology, applied in circuit devices, AC network load balancing, reducing/preventing power oscillation, etc., can solve the problems of great significance for the future development of the new energy industry and high cost of energy storage systems, and achieve improvement effects , SOC changes are stable, and the effect of extending the service life
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Embodiment 1
[0056]Embodiment 1: An energy storage capacity optimization configuration method based on improved primary frequency regulation, including step S1: propose a capacity optimization configuration model, and calculate the standard deviation R of the power grid frequency value at different times according to the sampling data, expressed as:
[0057]
[0058] In the formula: n represents the number of sampling points, f i Indicates the frequency value corresponding to the i-th sampling point, f 0 Indicates the reference value of grid frequency;
[0059] a) If the standard deviation R increases, control the energy storage output to adjust the frequency until the standard deviation R decreases;
[0060] b) If the standard deviation R decreases, detect the SOC state of the energy storage battery;
[0061] S2: Detect the SOC state of the energy storage battery, when the SOC value of the energy storage is at SOC ref It is most beneficial to the operation of energy storage when the...
Embodiment 2
[0104] Example 2: An optimal configuration method of energy storage capacity based on improving primary frequency regulation. Using the above-mentioned method to conduct a calculation example analysis, a 1MW photovoltaic power station in Nanjing was selected as the analysis object, and it was selected from 6:00 a.m. to 6:00 a.m. the next day , a total of 24 hours of power generation data. The sampling period is 5 minutes, with a total of 288 sampling points, the maximum output power is 840kW, the minimum output power is 10kW, and the average output power is 348.374kW. The average maximum fluctuation rate of power every 5 minutes is 27.6%, the charge and discharge efficiency of energy storage is 90%, and the SOC max Take 0.9, SOC min Take 0.1. The variation curve of photovoltaic output in one day is as follows: image 3 shown.
[0105]The voltage level of access to the grid is 10kV, and the transmission power is 2MW. The optimal configuration model, constraint conditions a...
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