Five-level voltage source conversion device
A voltage source type, conversion device technology, applied in the output power conversion device, the conversion of AC power input to AC power output, the conversion of AC power input to DC power output, etc., can solve problems such as inconvenience in use, and achieve hardware structure. Ease of use, easy device selection and management, and simple structure
Active Publication Date: 2017-12-19
HICONICS ECO ENERGY TECH CO LTD
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Problems solved by technology
Although the cascaded five-level conversion device does not require a large number of clamping diodes and clamping capacitors, it requires an independent DC voltage source, which is inconvenient to use
Method used
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[0014] figure 1 It is a topology diagram of the first embodiment of the present invention. Such as figure 1 As shown, the five-level voltage source conversion device of the present invention consists of a DC bus capacitor string, a first switching device string, a second switching device string, an auxiliary capacitor Cph, and 2 sets of freewheeling circuits to form a bridge arm, and the DC bus capacitor The string is composed of 4 DC bus capacitors C1-C4 with equal capacity connected in series. The DC bus capacitors C1-C4 use electrolytic capacitors, and the positive and negative electrodes are connected between each capacitor.
[0015] The first switching device string is composed of 8 active switching devices S1-S8 with anti-parallel diodes connected in series in the same direction, and its two ends are connected in parallel with the two ends 1 and 5 of the DC bus capacitor string, and the fourth has The connection point 10 of the source switching device S4 and the fif...
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The invention provides a five-level voltage source type converting device. A direct-current bus capacitor string formed by serially connecting four capacitors C1-C4, a first switching device string, a second switching device string, an auxiliary capacitor and two groups of follow current circuits form a bridge arm. The first switching device string is connected in parallel with two ends 1 and 5 of the direct-current bus capacitor string, and a connecting point 10 of the first switching device string is connected with a connecting point 3 in the direct-current bus capacitor string. The second switching device string is connected in parallel to connecting points 8 and 12 in the first switching device string, an auxiliary capacitor Cph is connected in parallel to connecting points 14 and 15 in the second switching device string. Connecting points 7 and 9 in the first switching device string are connected in parallel to the first group of follow current circuits, and connecting points 11 and 13 are connected in parallel to the second group of follow current circuits. All the follow current circuits are respectively composed of follow current diodes Q1, Q2, Q3 and Q4, and connecting points of the follow current circuits are respectively connected with connecting points 2 and 4 in the direct-current bus capacitor string. Because no directly serially-connected devices exist and voltages borne by all devices are same, the five-level voltage source type converting device is convenient to select and manage.
Description
technical field [0001] The invention belongs to the field of power electronic converters and relates to a five-level voltage source conversion device. Background technique [0002] A diode-clamped five-level conversion device in the prior art, such as image 3 As shown, four capacitors C1-C4 connected in series are connected to both ends of the DC power supply. Each phase bridge arm of A, B, and C is composed of eight switching devices S connected in series, and each switching device S is connected to each The capacitor clamps the voltage of the switching device S to the voltage of a connected capacitor through the clamping diode D, and divides the DC bus voltage into multiple levels. In this structure, each clamping diode D requires clamping diodes D with different withstand voltages due to different clamping voltages, which brings difficulties to device selection and management, and poses hidden dangers to safety. For high voltage clamping diodes D such as image 3 The sh...
Claims
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IPC IPC(8): H02M7/483H02M7/5387H02M7/219H02M5/458
CPCH02M7/487
Inventor 徐晓张校飞汤子龙
Owner HICONICS ECO ENERGY TECH CO LTD