A Power Balance Control Method for Cascaded H-Bridge Inverters Based on Hybrid Modulation Strategy
A technology of balanced control and mixed modulation, which is applied in the direction of output power conversion device, conversion of AC power input to DC power output, AC network circuit, etc., and can solve problems such as unstable operation of the system and unbalanced power.
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[0052] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further clearly and completely described below in conjunction with the accompanying drawings and embodiments.
[0053] figure 1 It is a single-phase cascaded H-bridge photovoltaic grid-connected inverter topology according to the embodiment of the present invention, which includes N identical H-bridge units, and N pieces of photovoltaic panels PV are connected to the N H-bridge units. 1 , PV 2 …PV N , the working condition of the photovoltaic panel is at a temperature of 25°C and a light intensity of 1000W / m 2 The maximum power point voltage is 35.1V, each photovoltaic panel is connected to each H-bridge unit through a 18.8mF capacitor, and the cascaded system is connected to the grid through a 1.5mH inductor L.
[0054] The control diagram of the present invention is as figure 2 As shown, it includes three parts: total DC side voltage c...
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