The Design of Dynamic Reactive Power Compensating Device and the Chaotic Analysis of Its Integration
|Course||Control Theory and Control Engineering|
|Keywords||Power system SVC three-phase unbalance DSP Chaos|
As an increasing number of high-power fluctuation load being thrown into power system and a higher expectation for power quality, the control of reactive power becomes a hot research topic in the control field, which is also an important development direction of modern power industry. With its merits such as rapid continuous adjustable reactive power output and three phase independent control, Static Var Compensator (SVC) is growing to be the preferred project in the reactive power control of the power system of fluctuation load, which is also one of the solutions to improve the national power quality.Under this situation, this thesis proposed a dynamic reactive power compensating controller based on dual-core, which is grounded on the SVC research project empoldered by Northeast University entrusted by a power electronic company of Anshan. This controller realized the design and development of reactive power compensating controller for 15k volt network and completed the whole design of SVC system and the adjustment of each hardware and software circuit by adopting the average power compensating algorithm expressed by instantaneous current and voltage of the load, with DSP as a control chip and a singlechip as its peripheral circuits chip. The Matlab simulation results showed that each result can meet the requirement. The last part of this thesis is about the research on chaos phenomenon in the power system with SVC controller.The SVC controller mentioned in this thesis is designed according to the requirement of actual project. First the global structure of the system is designed, based on which the detailed analysis of the main hardware circuit is carried, and its corresponding software is designed with a provided flow chart. Then the control strategy is chosen, a PI regulator is designed, and a mathematic model of SVC system is built. The feasibility of the system design is verified by the results of simulation using Matlab.Finally, the chaos phenomenon in the power system with SVC device is analyzed. By comparing the simulation results of power systems with and without SVC device, the conclusion is that the chaos exists in the power system when the SVC device is installed, but it can be eliminated by adjusting the control parameters. This simulation result provides basis for researches on basic theory of power quality, and puts forward new requirements for SVC devices.