科研之友
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摘要
The switching frequency of a power device is a very important parameter in the design of a parallel active power filter (PAPF), but so far, very little discussion has been conducted on it in a quantitative manner in previous publications In this paper an extensive analysis on the effects of the switching frequency on the performance of a PAPF is made and a specification of the switching frequency values with different compensation results is presented A first order inertia element and a second-order oscillation element are considered as approximate models of a PAPF, respectively The compensation characteristic for each order of harmonic current is obtained at different switching frequencies Then the THDs of each model for the system loads of a rectifier with resistance and inductance loads are proposed The compensation results of a PAPF controlled as a first-order inertia element are better than those of a PAPF controlled as a second-order oscillation element With two types of system loads which are rectifier with resistance and inductance loads and rectifier with resistance, inductance and capacitance loads the THDs of the source current after compensation are presented with different switching frequencies The compensation characteristics for the most widely used digital control system are investigated The situation with an analog control is the theoretical characteristic and it is the best situation The compensation characteristic of the digital control is worse than the compensation characteristic of the theoretical characteristic Based on these analyses the specifications of compensation characteristics with different switching frequencies are quite straightforward Finally a practical design example is studied to verify the application
- 出版日期2010-11
- 单位西安交通大学
