Multifunctional energy storage converter design method based on double deviation compensation control algorithm

Abstract

The invention discloses a multifunctional energy storage converter design method based on a double deviation compensation control algorithm, and the method comprises specific steps: firstly, designinga multifunctional energy storage converter network topology, and then employing a current detection method based on a CSI filter, and obtaining a three-phase circuit P-according to a three-phase circuit P-; Obtaining a to-be-compensated local reactive power according to the Q theory; deriving an inner ring reference current; the reference current is used as the input of an inner ring controller;the inner loop controller outputs current to generate an IGBT driving signal under the action of a pulse width modulation link; therefore, the current output of the inverter is adjusted; and finally,an inner loop controller based on a double deviation compensation control algorithm is invented, and a self-adaptive controller based on multi-parameter decoupling identification is added into the double deviation compensation controller, so that the output current of the multifunctional energy storage converter can quickly and accurately track the inner loop reference current, and finally, the purpose of electric energy quality control is achieved.

Description

technical field [0001] The invention relates to the technical field of an energy storage converter control method for distributed power grid-connected current. Background technique [0002] With the intensification of the global energy shortage and the vigorous promotion of clean energy policies worldwide, under the dual pressures of energy demand and environmental protection, the application of distributed renewable energy such as solar energy and wind energy has attracted increasing attention from all countries. However, a large number of distributed power sources are connected to the distribution network, and the randomness and uncertainty of their output have brought new problems to the safe operation of the distribution network. Due to the small capacity of the distribution network connected to renewable energy and various types of loads, there are power quality problems such as voltage and current harmonics, three-phase voltage unbalance, and voltage fluctuations and d...

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Problems solved by technology

[0003] The multi-functional energy storage converter ensures power output and also has the function of power quality compensation. The common advanced control strategies include fuzzy control, fractional control and frequency division control. Among them, fuzzy control is more robust and is suitable for storage The secondary correction of system charging and discharging instructions can be performed, but the model establishment rules are complicated; the layered control puts the voltage error compensation loop in the second layer control of the microgrid, which has strong fault tolerance, but has slow convergence speed and a large amount of calculation. However, the frequency division control can achieve zero steady-state error control for specific sub-frequency components, but ignores the influence of grid-connected frequency and system stability; in addition, if PI control is used, the structure is simple and the feasibility is strong, but The parameters that need to be sorted are highly sensitive, and there are defects such as large overshoot time and overshoot amount, making it difficult to achieve ideal control effects

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