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并联补偿单元是用户电力统一调节器 ( UCPC)的基本单元 ,由于并联补偿单元和串联补偿单元在拓扑上具有良好的对称性 ,因此 ,并联补偿单元的研究对 UCPC的研制具有相当的普遍意义。文中给出了基于三电平变流器的并联补偿单元的主电路以及驱动与保护系统的设计 ,成功解决了主电路中器件耐压问题 ,并降低了输出电压电流中的谐波含量 ;同时还给出了基于双 DSP的先进的全数字控制系统的设计 ,快速 DSP的使用是实现基于重复控制和无差拍控制的上层算法和基于电压空间矢量的脉冲发生器的重要保证 ;在控制策略上 ,由于在无差拍控制的基础上采用了重复控制的原理 ,变流器可以同时完成谐波、无功与不对称的补偿。实验结果证明了设计的正确性 ,也表明UCPC并联单元的研制取得了阶段性成功。
The parallel compensation unit is the basic unit of UCPC. Since the parallel compensation unit and the series compensation unit have good topological symmetry, the research of parallel compensation unit is of universal significance to the development of UCPC. The main circuit of the parallel compensation unit based on three-level converter and the design of drive and protection system are given in this paper, which successfully solved the withstand voltage of the device in the main circuit and reduced the harmonic content in the output voltage and current. Meanwhile, The design of an advanced all-digital control system based on dual DSP is also given. The fast DSP is an important guarantee to realize the upper algorithm based on repetitive control and no beat control and the pulse generator based on voltage space vector. In the control strategy , Due to the principle of repeat control based on no beat control, the converter can complete the harmonic, reactive and asymmetrical compensation at the same time. The experimental results prove the correctness of the design and also show that the development of the UCPC parallel unit has achieved a stage success.