| DC distributed generation is a promising technology to generate electricity. Thus, the way of achieving the goal of energy optimal control has become more and more popular in recent years. This paper achieves the goal by using the DC bus signal.The research object is an independent running DC distributed systems which are composed of photovoltaic, batteries, fuel cells and local-loads in this paper. The output characteristic of the PV array is analyzed in this paper. Shortcoming of traditional voltage disturbance observer method was discussed and improving it with the new method. it is not only overcomes the fluctuations of the steady state duty cycle in steady state but also improves the stability of the system by combining the bus voltage control and maximum power tracking control. It improves the stability of the system. The battery's performance characteristic is analysised in detail. The factor which affects the stability of the system is discussed. Its'interfaces converter is controlled effectively which can stabilize the bus voltage and maintains good performance in the condition of load fluctuations. The fuel cell unit considers its'the minimum economic performance and the battery's charging.All the working state of power module is discussed in detail and analyzing the energy optimization control method of system when a distributed system is running. Each power converter's structure, principle and control method is detailedly discussed in the systemThe DSP2407 chips of Ti are used as the core part of Experimental validating in this article. A distributed system experimental platform is established and discusses the working principle of the main hardware. The system's control block diagram is given. At last an experiment is set to verify the theoretical correctness.
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