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The optimal design of loosely coupled transformer is the key technique in the wireless power transfer (WPT) system. An improved reluctance model is proposed based on partitioning flux tube method, all parts of reluctance and coupling coefficient expressions are shown. This paper shows the optimization design method which objective function is minimum copper loss in given power transfer capability. In the light of features of optimization model, primal-dual interior point method is introduced to opti- mize the design parameters. Experiment results show that the mutual inductance calculated was verified with experimental measurement. The WPT system has less copper loss and less number of turns in given power transfer capability. The system achieves low cost low loss design, all the parameters met the design requirements. The validity of optimization algorithm is proved, and can be used as a general WPT optimization design method to other types of loosely coupling transformers.

As the space experiments being more complex, the network seems to occupy too much volume and mass, also difficult to arrange. Power Line Carrier (PLC) communication which has been in application is a way to minimize the cable network, light the system and reduce the cost. In this paper, a power supply and communication network with PLC modules is proposed, and the module is specially designed for space application. Furthermore, by setting up a test system, the significant performance and improved EMC is verified, proving that PLC communication is feasibility for future spacecraft.

The STATCOM based on four-leg voltage source converter can compensates the negative sequence currents and neutral currents of unbalanced loads. When the STATCOM is compensating the unbalanced loads, the DC side capacitor of the STATCOM is used to absorb and release the unbalanced power. In this case, the DC side voltage of the STATCOM will contain second harmonic wave. In traditional STATCOM control system, one of the control targets is DC side voltage stabilization. The second harmonic wave in DC side voltage will be compensated and it will counteract the unbalanced power absorbing and releasing. It will result in the unbalanced load compensation failure. In this paper, a novel control strategy based on notch filter for four-leg STATCOM is presented. The notch filter smooth the DC side voltage and the control system used the result as the input of voltage control loop. The control loop stabilize the DC sequence of the DC side voltage instead of the real time DC side voltage. With the novel control strategy, the control system can compensate the unbalanced load and stabilize the DC side voltage in the same time. Results of Simulation analysis and prototype experiment show that: with the novel control strategy, the unbalanced load current can be compensated more effectively and the third harmonic currents of the power supply is reduced. The Simulation and experimental results demonstrate that the proposed control strategy based on notch filter for the four-leg STATCOM is effective.