Single-phase grid-connection converter vector control method
A vector control and converter technology, applied in the field of power electronics, can solve problems affecting system dynamic performance, deviation, etc., and achieve the effects of fast dynamic response, increased system bandwidth, and high control performance
Active Publication Date: 2015-04-15
SOUTHEAST UNIV
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Problems solved by technology
Usually, the virtual quadrature component is obtained by delaying the actual physical quantity by 1 / 4 grid cycle. Therefore, if any form of mutation occurs in the actual physical quantity, such as sudden change of active power command, dynamic compensation of reactive power, etc., it will be delayed after 1 / 4 grid cycle. It is reflected in the virtual component, causing the current tracking dynamics of the entire system to start after 1 / 4 of the power grid cycle, and the actual value of the current has a large deviation from the command value, which seriously affects the dynamic performance of the system
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[0024] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.
[0025] Aiming at the lack of one degree of freedom in single-phase grid-connected converters, the invention constructs a virtual component by means of fictitious circuit calculation, and then performs feed-forward decoupling control by using the actual physical quantity and the virtual component. In particular, the virtual component is calculated by the virtual circuit calculation based on the value of the virtual component in the previous sampling period, and is initiall...
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The invention discloses a single-phase grid-connection converter vector control method. The method comprises the steps of: building a discrete imaginary axis loop through a control system, unifying the mathematical models of single-phase and three-phase grid-connection converters, and successfully applying a feedforward decoupling control strategy which is widely applied in a three-phase grid-connection converter to single-phase grid-connection converter occasions. By utilizing the method, virtual quantities which are orthorhombic to actual circuit voltage and current can be calculated in real time and are inputted into the control system to form a closed-loop control, so that non-offset control of grid-side current can be realized, and moreover, active power and reactive power independent controls are allowed; and additionally, compared with a conventional method for building physical quantities based on time delay, the vector control method does not need to introduce a time delay link, and the dynamic response velocity of the system is greatly increased.
Description
technical field [0001] The invention relates to a vector control method of a single-phase grid-connected converter, belonging to the technical field of power electronics. Background technique [0002] With the continuous improvement of the performance of power electronic devices, grid-connected converters have been widely used in more and more occasions because they can provide controllable active power and reactive power to the grid and have low harmonic content. Among them, in some specific occasions, such as micro photovoltaic grid-connected systems, single-phase grid-connected converters are usually used. In addition, the single-phase grid-connected converter is the basic module unit of the cascaded H-bridge converter, and its control performance is the basis for the stable operation of the latter. Therefore, the single-phase grid-connected converter and its control have gradually become a research topic in recent years. hotspots. [0003] In order to eliminate the ste...
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IPC IPC(8): H02M7/5387H02J3/38
CPCY02A30/60
Inventor 赵剑锋孙毅超季振东姚晓君
Owner SOUTHEAST UNIV