[雙語翻譯]--外文翻譯--重復控制策略的交流電子負載的能量回收（英文）

1、A REPETITIVE CONTROL STRATEGY OF AC ELECTRONIC LOAD WITH ENERGY RECYCLINGWANG Shaokun, HOU Zhenyi, PENG Chuanbiao The Telecommunication Engineering Institute ,Airforce Engineering University, Xi’an , Shaanxi, China, 71

2、0077 Phone: +86-29-84798479, Fax: +86-29-84798479, Email: wsk9001@163.comKeywords: AC electronic load, load simulator, energy recycling, repetitive control. AbstractThe AC electronic load with energy recycling is a new

3、 type of test equipment, which can simulate a variety of load characteristics, and test energy can be feedback to the utility power system with little loss and high power factor. Compared to traditional load device,u

4、sually more than 80% energy would be saved. It is energy-saving, environment- friendly and convenient in use, and has wide prospect of applications. In this paper, the characteristic of AC electronic load with energy

5、recycling and active power balance of system are introduced, the key technology of AC electronic load is current characteristics simulation, for the requirements of simulating accuracy, A repetitive control strategy o

6、f AC electronic load with energy recycling is studied, and repetitive Control of load simulator is analyzed. Simulation based on the MATLAB / Simulink is done, theoretical analysis and simulation results show that th

7、e input current precision of load simulator is greatly improved, and then the precision of load simulation. 1 Introduction The AC electronic load is a new type of power electronics instrument that can run with the sam

8、e function as all kinds of load such as resistors, inductances and capacitors. It is widely used in the research or test of inverter, UPS, electronic generating set, etc. In traditional tests, The normal load such as

9、 resistors, not only waste a lot of test energy , but also pollute the test place by the heat of resistors in test. So when the kind of AC electronic load with energy recycling (AC electronic load) was presented, test

10、 energy can be feedback to the utility power system with little loss and high power factor. No heat is produced and it has higher output efficiency. So the AC electronic load with energy recycling is a new type of te

11、st equipment with wide prospect of application. The key technology of AC electronic load is current characteristics simulation and energy feedback with high power factor and high efficiency[1]-[3]. The power circuit

12、topology is dual PWM converter, different control strategy is used in the two stages. The analog control strategy is used in the first stage(load simulator), such as PID control[4], hysteresis control etc[5], and the

13、dual loop feedback control with PLL is used in the second stage(energy regeneration). With the development of new control theories, the application of some new control technology in the AC electronic load improve its

14、performance. In document[6][7], the electronic load simulator used in UPS test is studied. It is a controled voltage source between UPS and utility power system, through changing its voltage and phase, energy would b

15、e feedback to the utility power system. But its instantaneous power and active power is not independent. In document[8], a common electronic load with energy recycling is proposed, concluding two composed bidirection

16、al VSRs(Voltage Source Rectifier ). The two VSRs share one common DC capacitor. The first stage is rectifier mode and the second stage is inverter mode. The controller of these two stages is independent. But the harmo

17、nic of the tested Source is not involved. In document[9], A delay- compensated deadbeat Current Controllor for AC electronic load is proposed, which realize linear state feedback and poles placement and the delay impa

18、ct is eliminated so that deadbeat control is fully realized in current loop. In this paper, the main circuit topology in the document [11] is adopted, for the high precision of AC electronic load simulation, a repet

19、itive control strategy used in this circuit topology is presented, theoretical analysis and simulation show that the input current precision of load simulator is more improved, and then the precision of load simulatio

20、n. So the strategy is a effective way for the load characteristic simulation of AC electronic load. 2 Main circuit topology and active power balance2.1 Main Circuit Topology The main circuit topology of single phase

21、AC electronic load is shown in Fig.1[8]. It has two composed bidirectional VSRs. The two VSRs share one common DC capacitor. In Fig.1, the left-side VSR(first stage ) is load simulator, the right-side VSR(second stag

22、e) is energy regenerator. Through some control strategy, the amplitude and phase of the input current of load simulator is controled to simulate a real impedance load. The common DC capacitor transfer energy from loa

23、d simulator to energy regeneration. The second stage is an inverter, which fed back the energy absorbed from the test set to the utility power system with unit power factor.0.95; the gain of repetitive controller r K

24、 is choosen between 0 and 1, in this system r K is 0.9; from the document[13][14], ? ? z Sis designed as a digital filter which cut-off frequency is 1.5KHz; k z is leading unit to compensate phase delay of sytem, so

25、 it is choosen as 3 z .4 SimulationTo validate the repetitive control for AC electronic load, the Simulink model has been built to simulate the system. The power circuit topology is shown in Fig.1, the parameter of th

26、e power circuit list in Table 1. In the controller of load simulator, two kinds of control strategy was adopted, which are repetitive control and PID control. The PID control of load simulator is shown in Fig.3. Fig

27、.3 Block diagram of PID controll of load simulator Table 1. parameters of simulation on power circuit Input inductance 5mH DC capacitance 2400µF DC voltage 450V Output inductance 5mH Parameter of utility power

28、 system 220V 50Hz The input current waveform of load simulator by repetitive control is shown in Fig.4, we can find that the input current waveform s itracks the waveform of reference current r i perfectly , which i

29、s better than the waveform in Fig.5 by PID control. Fig.4 The input current waveform of load simulator by repetitive control Fig.5 The input current waveform of load simulator by PID control 5 Conclusion In this paper, t

30、he repetitive control on the load simulator of AC electronic load with energy recycling is studied. The application characteristic of repetitive controller was analyzed. Simulation results testify the effectiveness of

31、 the whole system. It achieves little steady error tracking and simulates the real load accurately. The precision of load simulator was studied in this paper. The dynamic or nonlinear load simulating would be the go

32、al of prospective study. So the control method which combines repetitive control and other control strategy would be the next work. References [1] Ayres C A, Barbi I. A Family of Converters for Power Recycling dur

33、ing UPS's Burn-in Test[A].Proc.of IEEE 26th Annual Meeting of Power Electronics Special-fists Conference, PESC'95. 1995: 1.486-492. [2] Shyh-Jier Huang, Fu-Sheng Pai. Design and Operation of Burn-in Test S

34、ystem for Three-phase Uninterruptible Power Supplies [J].IEEE Trans.on Industrial Electronics, 2002, 49(1):256263. [3] MingTsung Tsai, Charles Tsai. Energy Recycling for Electrical AC Power Source Burn-in Test[J].IEE

35、E Trans. on Industrail Electronics, 2000, 47(4):974-976. [4] Buso, S., Malesani, L., and Mattavelli,P. Comparison of current control techniques for active filter applications, IEEE Trans. Ind. Electron., 1998, 45, (5

36、), pp. 722–729 [5] Marques, G.D. A comparison of active power filter control methods in unbalanced and non-sinusoidal condition. Proc. IEEE Industrial Electronics Society Conf. (IECON), August–Septmber 1998, Vol.1,

37、 444–449 [6] C L Chu, J F Chen. Self-load Bank for UPS Testing by Circulating Current Method. IEE Proc. Electric Power Applications, 1994, 141(4):191-196. [7] S. C. Gupta, R. Ruth. Load bank elimination for UPS tes