Automatic photovoltaic power station power generation control method

Abstract

The invention discloses an automatic photovoltaic power station power generation control method. The method comprises steps that active target value correction is carried out through considering active loss conditions, on the basis of scheduling issued active target values, active loss compensation amount correction is additionally carried out to acquire new active target values; actual power generation capacity of each inverter is calculated; a grid connected electricity price is considered, in combination with the actual power generation capacity of each inverter, the active target values are distributed, instructions are further issued, distribution is carried out according to the actual power generation capacities of the inverters, after an active target value of each inverter is acquired through distribution calculation, active target value instructions are issued to each inverter for execution; the target values are dynamically adjusted and controlled according to execution conditions, execution conditions of each inverter are tracked, if power adjustment of the inverters is not in place, power generation capacities of the inverters are updated, and active target value distribution calculation and instruction issuing are carried out for another time. The method is advantaged in that power generation benefits of a photovoltaic power station can be effectively improved, andthe regulation and control management level of power scheduling for the photovoltaic power station is improved.

Description

Technical field [0001] The invention belongs to the field of power system automation control systems, and particularly relates to a photovoltaic power station automatic power generation control method in the power system automatic control system. Background technique [0002] At present, there are more and more photovoltaic power stations in China. Faced with the pressure of large-scale photovoltaic power stations to connect to the grid, the automatic power generation control of photovoltaic power stations is an effective measure to increase the rate of photovoltaic grid connection. On the one hand, the automatic power generation control of photovoltaic power stations must meet the power grid regulation requirements, and on the other hand, it must also ensure the power generation benefits of photovoltaic power stations. [0003] The current automatic power generation control scheme commonly used in photovoltaic power plants is to distribute and calculate the dispatched active power...

AI Technical Summary

Problems solved by technology

[0005] 1) Active power loss is not considered: the active power target value issued by the dispatcher is the control object of the high-voltage side grid-connected power, and the current output by the inverter will generate Active power loss, the final high-voltage side grid-connected power will be less than the active power target value due to the existence of active power loss, and the power generation benefit of the photovoltaic power station cannot be maximized

[0006] 2) The actual power generation capacity of the inverter is not considered: it is allocated according to a fixed ratio, which cannot take into account the actual power generation capacity of each inverter, and it is easy to cause a mismatch between the actual power generation capacity and the active power target value, that is, the allocation of inverters that can generate more power The active power target value is small, and the active power target value allocated by the inverter that cannot generate more power is large, which will easily cause the loss of the overall power generation

[0007] 3) Phased electricity price is not considered: According to the photovoltaic subsidy policy implemented by the country, the grid-connected electricity price of photovoltaic inverters that are constructed and connected to the grid in different periods in the same photovoltaic power station is different.

Prioritizing the use of inverters with high grid-connected electricity prices for power generation can obtain higher power generation revenue, while the fixed-proportion distribution method cannot perform differential power generation according to differential electricity prices, and will not be able to allow inverters with high grid-connected electricity prices to generate more power to obtain higher revenue. Power Generation Revenue

[0008] 4) Lack of dynamic adjustment: When there is a large deviation between the actual active power generated by the inverter and the distributed active power target value, since the active power target value distributed by each inverter remains unchanged, it is lost by adjusting other adjustable The opportunity for the inverter to make up for the deviation of the generated power results in a large deviation between the actual active power and the target value of the adjusted active power, which reduces the control and management level of the photovoltaic power station by the grid dispatcher and the power generation efficiency of the photovoltaic power station

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