| Facing the problem of over growing demands for scarce energy resources,the development of the modem power supply system is ongoing.The developing trends include introducing the concept of "green energy" for energy saving and environment protecting,utilizing new natural primary energies such like solar and wind power, reducing power consumption of power supply to enhance their efficiency and improve their performance,transferring from central power supply system to distributed power supply system and so on.And the power management in the modern power supply system attracts more and more attentions.According to the development of the modem power supply system,a power management architecture was proposed for photovoltaic(PV) system in this dissertation.The work focuses on some control technologies in area of power management including the maximum power point tracking for PV panel,load share control for paralleled power supply systems,hot swap control for the power systems with fault-tolerant and redundant capability and charging control for secondary batteries.Based on the discussion in this dissertation, the corresponding power management control ICs were developed and their functions were verified through testing.The main contributions in this dissertation are:1) Based on deep research on the maximum power point tracking(MPPT) control method for PV panels,two integrated MPPT control ICs were designed using voltage-based MPPT method and perturbation and observation method respectively. An equivalent circuit model for PV panel,which could simulate the characteristics of the photovoltaic panel realistically,is established.The model can be applied to the circuit design and verification in the Spectre simulation environment.Test results showed that the developed IC tracks the MPP precisely and features fast dynamic response to fluctuations of circumstance conditions such like the temperature and the insolation.And the main expected features were well implemented. 2) A power management system was proposed.Using the developed power management ICs,the MPPT controller and the load share controller,a modeling system for a PV power system was founded.It is a subsystem with multiple paralleled DC/DC converters and endowed with MPPT and load share control functions.The system simulation showed that the performances of the system are in accord with the expectations.And the system has short static settling time and quick dynamic response.3) To constitute a complete PV power system by proposed PV power supply and charger system as well as to enhance and optimize its performances,some power management ICs was developed and fabricated.To fit the requirements of charging control for batteries,a charging control IC based on a four-stage charging scheme was realized,which is suitable for charging control of different secondary batteries.To solve the issues of load share among the power modules in the paralleled power system,a load share controller IC using the automatic master-slave structure was proposed.To enhance the hot plug & play capability of the power supply system,a hot swap controller IC was developed.All the ICs referred to above were fabricated and verified.Test results showed that the expected functions were well realized.The work of this dissertation provides useful experiences to the study of power management control ICs in modern power supply systems on aspects of control strategy implementation,system structure construction as well as the circuit and physics realization.And all these could be considered as a good foundation of the design of corresponding control ICs.And it also provides technical supports for the developing modem power system from the point of view of control technology for power supply system.
|
PDF Full Text Request