Abstract
As a clean and fuel adaptive alternative power plant, the Stirling power generating system has drawn attention of experts and scholars in the energy field. In practical application, the instability of free-piston Stirling power generating system caused by abrupt load change is an inevitable problem. Thus, methods to improve the output frequency response and stability of the free-piston Stirling power generating system are necessary. The model of free-piston Stirling power generating system is built by isothermal analysis firstly, and the initial control strategy based on given voltage system is put forward. To further improve the performance of power system, a current feedback decoupling control strategy is proposed, and the mathematical model is established. The influence of full decoupled quadrature-direct (d-q) axis currents is analyzed with respect to the output voltage adjusting time and fluctuation amplitude under the variations of piston displacement and output load. The simulation results show that the system performance is significantly improved, but the dynamic regulation lags caused by the decoupled current control still exist. To solve this problem and improve the performance of decoupled-state feedback current control that relies on parameter accuracy, internal model control based on sliding mode (IMC-SM) current decoupling control strategy is proposed, the system model is established, and then the performance of voltage ripple in generating mode is improved. Finally, the test bench is built, and the steady state and transient voltage control performances are tested. The feasibility and priority of the control strategy is verified by experiment and simulation results.
Highlights
With the increasingly severe situation of energy and environmental protection in the world, clean energy has become the focus of the research field in the new century, so the Stirling power generating system has attracted much attention
With regard regard to to the the dynamic dynamic regulation regulation lag lag in in the the decoupled decoupled current current caused caused by by system system loop parameter variations, an internal model control based on sliding mode is proposed, which parameter variations, an internal model control based on sliding mode IMC-SM is proposed, which improves the performance of the decoupled-state feedback current control that relies on system improves the performance of the decoupled-state feedback current control that relies on system parameter accuracy, accuracy, and and further further reduces reduces output output voltage voltage ripple ripple in in generating generating mode mode by by simulation simulation parameter comparison and analysis
To improve the output voltage load response in generating mode, decoupled state feedback is limited by the pressure wave generator, but the generating system still verifies the correctness of the simulation results
Summary
With the increasingly severe situation of energy and environmental protection in the world, clean energy has become the focus of the research field in the new century, so the Stirling power generating system has attracted much attention. L Kirby combines the characteristic of output stroke and load, which energy conversion to realize steady control under generating state [16]. Daboussi proposed a linear motor rotor position detection method of Stirling power system, able to control fuel consumption by controlling the output of current [17]. With the benefits of simple structure and easy realization, stroke and current-voltage double closed-loop control strategies [19,20,21,22] are[19,20,21,22]. Employed in traditional current-stroke and current-voltage double closed-loop control strategies are employed in free-piston power generating system, which ignored the d-q axis current coupling problem.
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