A grid-connected power smoothing method for solar-storage power stations based on battery SOC
A power generation and power smoothing technology, applied in photovoltaic power generation, single grid parallel feeding arrangement, electrical components, etc., can solve the problems of battery overcharge and overdischarge, affecting the life of the energy storage battery, etc., to prolong the service life and improve the system. Stability, the effect of improving the utilization rate of solar energy resources
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no. 1 example
[0033] The first embodiment of the method of the present invention comprises:
[0034] Step 1: Obtain the actual generated power P of the photovoltaic power generation unit in the current period PVS [M] and the grid-connected power command P in the current operation period grid ;P PVS [M] means an array containing M generating powers.
[0035] Step 2: For the actual generated power P PVS [M] Perform low-pass filtering and take the last value P of the filtering result PV ; In this embodiment, the amplitude-frequency function of the low-pass filter is
[0036]
[0037] Among them, T=1 / 2πf, f is the cut-off frequency of the low-pass filter, and ω is the frequency variable. The last value of the filtering result reflects all the previous values to a certain extent, and has a certain relationship with it.
[0038] Step 3: According to P PV and grid-connected power command P grid Estimate the state of charge SOC of the energy storage battery at the beginning of the next...
no. 2 example
[0050] On the basis of the first embodiment, this embodiment also includes the establishment of constraints on the average value P of the predicted instantaneous power generation esg1 Limit to get P esg2 , and P esg2 As the charge and discharge power command of the energy storage power unit, it specifically includes the following steps:
[0051] Step 51: Establish the inequality SCO min ≤SOC≤SOC max (6), bring equation (2) into it, and then solve the inequality SOC min ≤SOC n +K*N*P esg *Δt≤SOC max (8), get SOC n is the state of charge of the energy storage battery at the beginning of the next running period;
[0052] Step 52: Calculate the inequality P min ≤P esg ≤P max (7), intersection with inequality (9);
[0053] Step 53: Determine the average value P esg1 Does it fall into the intersection: if so, then P esg2 equal to P esg1 ; if P esg1 is smaller than the minimum value of the intersection, then P esg2 Equal to the minimum value of the intersection; if...
no. 3 example
[0056] On the basis of the second embodiment, this embodiment also includes step 6: P esg2 Transmit to the energy management system and receive the charging and discharging power P dispatched by the energy management unit esg3 , the P esg3 As the charge and discharge power command of the energy storage power generation unit.
[0057] When P esg1 ,P esg2 ,P esg3 The sign of positive indicates that the energy storage battery is charging, and the sign of negative indicates that the energy storage battery is discharging.
[0058] The energy management system (EMS) is provided to the dispatching and control center of the power system, which collects, monitors and controls the data of the power system, and conducts optimization analysis and control. The energy management system is used to adjust P according to its own scheduling strategy esg2 is tested, if P esg2 Satisfy the requirements of the scheduling policy, then P esg3 equal to P esg2 , otherwise, the scheduling syste...
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