Fixed-frequency direct-power PWM converter controlling method having rapid power response capability
A converter control and power response technology, applied in the field of power electronics, can solve the problem that the improvement method of the power fast response capability is rare, and achieve the effect of enhancing the dynamic response capability.
Inactive Publication Date: 2013-10-09
HUNAN UNIV
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Problems solved by technology
However, in the constant frequency direct power control strategy, there are not many methods to improve the fast response ability of power.
Method used
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Embodiment Construction
[0035] Further illustrate the present invention below in conjunction with accompanying drawing.
[0036] The topology of the three-phase voltage-type PWM converter used in the present invention is as follows figure 1 As shown, in the figure u a , u b and u c is the three-phase grid voltage; i a i b and i c is the three-phase grid current; U ra , U rb and U rc is the converter output voltage; u dc is the DC side voltage; L and R are the equivalent inductance and resistance values of the reactor connected to the AC side; R L is the load resistance; e L Is the back electromotive force of the load; C is the DC side voltage stabilizing capacitor; S1-S6 is the switching device composed of six IGBTs. according to figure 2 , the detection circuit collects three-phase grid voltage, three-phase grid current and DC side voltage signals; and sends the collected signals to the control circuit; then the control circuit generates 6 pulse control signals according to the set co...
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Disclosed in the invention is a fixed-frequency direct-power PWM converter controlling method having a rapid power response capability. A direct power control strategy and a space vector modulation technology are combined; and on the basis of the combination, the fixed-frequency direct-power PWM converter controlling method having the rapid power response capability is also added. According to the controlling method, a result obtained by difference processing on an active power given value and an active power actual value during the dynamic process is utilized and operation is carried out on the result and a given value of a reactive power, thereby changing the reactive power during the dynamic process; therefore, the transmission speeds of the active power at two sides of a rectifier is substantially improved; and a problem of direct-current voltage overshooting or dropping due to surplus or insufficient active power can be effectively solved. Moreover, the controlling method is designed simply; there is no need to increase extra hardware; and engineering realization can be carried out easily.
Description
technical field [0001] The invention relates to the field of power electronics, in particular to the field of control of wind power generation and grid-connected power conversion devices, in particular to a fixed-frequency direct power PWM converter control method with fast power response capability. Background technique [0002] Due to the reduction of non-renewable energy sources, power shortage, and increasingly serious environmental pollution, the research on new energy technologies has attracted widespread attention from all over the world. The PWM converter has the advantages of high power factor, low input current harmonic content, constant DC side voltage and bidirectional flow of power, etc., and has been widely used in wind power generation, AC drive, active filtering and other fields. [0003] At present, the research on the control strategy of PWM converter is mainly divided into direct current control and direct power control. Direct power control has attracted...
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IPC IPC(8): H02J3/38
Inventor 罗德荣王珏黄守道王辉高剑李孟秋姜燕
Owner HUNAN UNIV