Inverter Parallel Control Method and System Based on Robust Residual Generator
A robust residual generation and inverter technology, applied in the AC network to reduce harmonics/ripples, harmonic reduction devices, AC network circuits, etc., can solve the problem of increasing the loss of power electronic devices and deteriorating the circulation of multiple converters problems, increasing the cost of the filter volume, etc., to achieve the effect of improving power quality, improving transient performance and immunity, and ensuring system stability
Active Publication Date: 2021-03-09
NORTH CHINA UNIVERSITY OF TECHNOLOGY +2
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Problems solved by technology
[0005] The existing improved scheme adds more parameters related to droop control, and the parameter setting is complicated when the microgrid topology changes, and the relevant parameters of the original system need to be readjusted as the topology changes to achieve the purpose of improvement and ensure system stability. not conducive to plug and play
Inverters with different capacities will affect the power distribution when they are connected in parallel due to the difference in filter and controller parameters, which will worsen the circulation problem when multiple converters are connected in parallel and affect the overall stability of the system
At present, in practical applications, estimated values are usually used to select relevant parameters based on experience. The errors will not only increase the volume cost of the filter, but also increase the loss of power electronic devices and reduce the service life.
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[0052] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus their repeated descriptions will be omitted.
[0053] Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or mo...
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The present disclosure relates to a control method and system for inverter parallel disturbance feed-forward compensation control based on a robust residual generator. Among them, the method includes: calculating the filter inductance value, capacitance value and corner frequency when the reactive power of each inverter filter in the multi-inverter parallel topology is the smallest; further calculating the PI gain of the current loop and the voltage loop in the double closed loop; Establish a dynamic compensation control structure based on a robust residual generator, calculate current and voltage loop dynamic compensation controller parameters; increase feed-forward control based on a dynamic compensation controller, and control the multi-inverter according to the output current of each inverter Control of parallel topology of transformers. Under the premise of ensuring the stability of the system, the disclosure improves the influence of the parameter difference between the inverters on the power sharing, and makes the output voltage control more stable.
Description
technical field [0001] The present disclosure relates to the field of power electronics, in particular, to a method and system for controlling inverter parallel disturbance feed-forward compensation based on a robust residual generator. Background technique [0002] With the gradual penetration of green energy brought about by the transformation of the energy structure, the distribution network, which is closely connected with the majority of users in the power system, needs to meet the large-scale access of distributed generation systems DGs and energy storage devices, and adapt to the needs of new loads such as electric vehicles. Plug and play, and meet the continuous improvement of users' requirements for power quality. Microgrid is an effective means to reduce the impact and impact of distributed power and flexible compliance on the power system. When the large power grid fails or is repaired, the microgrid can operate in off-grid mode to ensure high-quality uninterrupte...
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IPC IPC(8): H02J3/38H02J3/01
CPCH02J3/01H02J3/381Y02E40/40
Inventor 胡长斌石向一罗珊娜马瑞范辉周京华郝晓光温春雪朴政国
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY