Voltage control method of three-phase inverter in distributed generation system
A technology of distributed power generation and three-phase inverters, which is applied in the direction of electrical components, output power conversion devices, AC power input conversion to DC power output, etc., and can solve problems such as control structure changes and poor dynamic response
Inactive Publication Date: 2012-05-23
XI AN JIAOTONG UNIV
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Problems solved by technology
When the operating mode is switched, the control structure of active power does not change, but the control structure of reactive power changes
At the same time, since it is controlled as a voltage source during grid-connected operation, the dynamic response during switching is poor
Method used
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[0050] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0051] refer to figure 1 , the distributed generation system is connected to the three-phase grid and key loads. The distributed generation system includes energy conversion unit, front-end converter and three-phase inverter ( figure 1 The big virtual box in ), where the three-phase inverter consists of a DC side energy storage device, a fully controlled power device, an output filter and a grid-connected switch ( figure 1 A small imaginary frame from left to right within a medium and large imaginary frame). The DC side energy storage device is generally composed of power capacitors. Fully controlled power devices generally use IGBT, IGCT or GTO. The output filter is employed by a filter inductor L f and filter capacitor C f The LC filter formed is realized, and the key load is connected to the output end of the LC filter. The grid-connected switch ado...
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The invention discloses a voltage control method of a three-phase inverter in a distributed generation system, which can realize switching between an island mode and a grid-connection mode. A control system comprises a phase generation module and an amplitude regulation module, wherein, the phase generation module acquires a phase position of power grid voltage in the case of grid-connection operation, and generates the phase position by integrating the rated grid angular frequency in the case of island operation. A capacitance voltage outer ring and an inductive current inner ring are adopted in the amplitude regulation module, and output for a D-axis voltage regulator is controlled by an amplitude limiter. In the case of island operation, the amplitude limiter does not work, and the inverter is controlled to be a voltage source; and in the case of grid-connection operation, the capacitance voltage ring fails to regulate capacitance voltage, the amplitude limiter works, and the inverter is controlled to be a current source.
Description
technical field [0001] The invention relates to the field of distributed power generation, in particular to a control method for a three-phase inverter in a distributed power generation system, which is used to realize seamless switching of the three-phase inverter between an island mode and a grid-connected mode. Background technique [0002] The traditional power system is mainly characterized by large units, large power grids, high voltage, and centralized, and its own defects can no longer meet the requirements of today's society. First, the reliability of power supply in traditional power systems is low. In the traditional large-scale power system, the disturbance caused by any point of failure will have a great impact on the entire power system. In severe cases, it may cause large-scale power outages or even the collapse of the entire network, resulting in catastrophic consequences. Second, the economic benefits of traditional power systems are not high. Centralized ...
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IPC IPC(8): H02M7/5387H02J3/38
Inventor 刘进军刘增
Owner XI AN JIAOTONG UNIV