有源电力滤波器英文文献和中文翻译.docx

1、有源电力滤波器英文文献和中文翻译附录附录一：英文文献A 10KV Shunt Hybrid Active Filter for a Power DistributionSystemAbstractthis paper analyzes the compensation performance of a shunt hybrid active power filter. The hybrid active power filter, which combines passive filter and active power filter, has both respective merits,

2、 and is an important developing trend of filtering device. The hybrid active power filter can reduce the capacity of active power filter effectively and is more suitable for the engineering application for high voltage nonlinear loads. The compensation performance of hybrid active power filter is an

3、alyzed by estimating the effect of different active power filter gain and parameters change. Then, a conclusion has been obtained that the harmonic attenuation rate is insensitive to the variation of passive parameters when the active power filter with an enough feedback gain is combined. Finally, t

4、he feasibility and validity of proposed scheme is verified by Simulation using Matlab and a hybrid shunt active power filter prototype. Index Terms:Current harmonics compensation, active power filter, passive filter, generalized integrators. I .INTRODUCTION In the development of power electronics br

5、ings convenience to energy conversion and utilization and also causes power quality problems. As one of the key technologies in combating power grid pollution and improving the power quality, active power filter (APF) has become a new research emphasis in power electronics technology1-5. Because of

6、high initial cost, the further application of active power filter is restricted. The HAPF(Hybrid Active Power Filter), combination of APF and passive filter (PF), can reduce the capacity of Affectively and is more suitable for the engineering application of APF for high voltage nonlinear loads.Tradi

7、tionally, Passive filter has been used to eliminate the harmonic in power system due to his low cost and high efficiency. A passive filter shows the low impedance at tuned frequency to absorb current harmonic and has a good compensation performance. However, passive filter has the disadvantage of de

8、pending on the parameters of power system, susceptible to the load and power system resonant and the characteristic change due to aging. In addition, passive filter usually is designed with fixed parameters, which can not be lightly adapted for the variation operation condition.Active power filter h

9、as been developed to overcome of disadvantages of passive filter and can provide flexible and reliable compensation, but is not a cost-effective solution duet the high operation cost.Because of the drawbacks of passive filter and active power filter, the research on hybrid active power filter has be

10、come more attractive 6-9. Hybrid active power filter composed of passive filter connected in series to an active power filter improves the compensation performance of passive filter remarkably, give more flexibility and reliability to filter device, and redound to the use of active power filter in h

11、igh-power system avoiding the expensive initial cost.In this paper, the compensation performance of hybrid active power filter in an industrial power distribution system is analyzed by estimating the effect of different active power filter gain and parameters change. Finally, the compensation of hyb

12、rid active power filter is verified by simulation and a laboratory prototype. The passive filter of prototype was tuned at the seventh harmonic and the generalized integrators are used to eliminate the 5th, 11th and 13th harmonic current10.II. PRINCIPLES OF CURRENT HARMONIC COMPENSATIONThe hybrid ac

13、tive power filter topology is shown in Fig.1, which consists of a three-phase pulse width modulation(PWM) voltage-source inverter (active power filter, APF)and the passive filter connected in series to APF through coupling transformer. Generally, the active power filter acts as a controlled voltage

14、source and force the harmonic current into the hybrid active power filter. The principle of operation of current harmonic is explained by the single-phase equivalent circuit shown in Fig.2 when the feedback control is applied to the active power filter. In the current harmonic compensation strategy,

15、 the active power filter is considered as a controlled voltage source VAPF, and ZF is the impedance of passive filter, ILh is the load harmonic current, ZS is the system impedance.In order to eliminate harmonic of the system current, the active power filter is controlled as a current controlled volt

16、age source. The active power filter imposes a voltage signal VAPF that forces load harmonic current flow into the passive filter, thus improving its compensation performance in despite of the variation in the tuned frequency of the passive filter. The voltage reference of active power filter is equa

17、l to VAPF = K I sh (1)Where, K is the harmonic compensation gain. Supposing utility voltage is pure sinusoidal, the ration between the utility harmonic current and the load harmonic current is obtained, which can be used to denote the filtering characteristics of hybrid active power filter.Otherwise

18、, K acts as a resistance to damp resonance between ZS and ZF. The larger K is selected, the lower the harmonic contents in the utility current. But this will increase the required power rating of the active power filter. In real condition, K is finite. Otherwise, closed loop control system will beco

19、me unstable. Fig. 1 hybrid active power filter configuration.Fig. 2 Single-phase equivalent circuit of the hybrid active power filter scheme.III. ANALYSIS OF THE HYBRID FILTERPERFORMANCE IN A DISTRIBUTION SYSTEMThis section will show the compensation performance of hybrid active power filter through

20、 an example. The power distribution energizes the six medium frequency furnace, each of 300KW rate power. The medium frequency furnaces energized by six pulse uncontrolled rectifiers. The single phase diagram of the power distribution is shown in Fig.3only considering hybrid active power filter and

21、medium frequency furnace.Fig. 3 Single-phase line diagram of the power distribution systemThe system harmonic content and harmonic criterion are shown in Table I and the 5th, 7th and 11th frequency harmonics exceed the criterion. So, the passive filters are tuned at the 5th, 7th and 11th frequency h

22、armonic and the rate of reactive power compensation is 500kVar. The system inductance and the parameters of passive filters are shown in Table II.TABLE IPOWER SYSTEM AND PASSIVE FILTER PAREMETERS5th7th11thHarmonic content(A)622814Harmonic criterion(A)26.519.812.3TABLE IIPOWER SYSTEM AND PASSIVE FILT

23、ER PAREMETERSL(mh)C(uf)R( m )KVARSystem2.45thharm.filter36.5711.089573487thharm.filter57.863.57212011211thharm.filter66.461.26382639.6In this case, the rate of active power filter is 25KVA since it would only compensate current harmonic and the coupling transformers turns ratio is equal to 2.Fig.4 (

24、a) shows the harmonic attenuation rate of passive filter and hybrid active power filter. The hybrid active power filter is characterized by using three single resonant filter tuned at the 5th, 7th and 11th harmonic frequency as shown inFig.3. Therefore, the passive filter presents low impedance at t

25、he 5th, 7th and 11th harmonic frequency and their neighborhood. When no active power filter is connected in series with the passive filter, the harmonic amplifying phenomenon appear in the frequency range of 200-240Hz,300-340Hz and 500-640Hz. When the active power filter with a feedback gain of 20 i

26、s combined, no harmonic amplifying phenomena occurs. Meanwhile, only adapting the passive filter, the filtering characteristic is unsatisfactory even at the 5th, 7th and 11th harmonic frequency. When the active power filter with a feedback gain of 20 is combined, the harmonic attenuation rate is inc

27、reased and the filter performance of the hybrid active power filter is satisfactory at the 5th, 7th and 11th harmonic frequency.Fig.4 (b) shows the harmonic content of power system indifferent condition. When no filter is connected in parallel with the utility, the 5th, 7th and 11th harmonic current

28、 exceed the criterion seriously. After only adapting the passive filter, the harmonic current of utility is weakened but unsatisfactory adequately. When the active power filter with a feedback gain of 20 is combined, most of 5th, 7th and 11th harmonic current is forced flowing into the hybrid active

29、 power filter.Fig.5 shows how the active power filter gain K changes the harmonic attenuation rate of system current. Large value of K improves the hybrid active power filter compensation performance by increase the harmonic impedance of power system.In addition, Fig.5 shows that the low values of p

30、assive filter quality factor Q will increases the impedance at the resonant frequency and weaken the compensation performance of hybrid active power filter. The passive filter quality factor Q decides the passive filter bandwidth. Though increasing the value of active power filter gain K can compens

31、ate the adverse effect of low value of Q, which would results in the increase of active power filter output voltage required to keep the same compensation performance, thus increasing the active power filter rated power.Fig. 4 Hybrid active power filter frequency response and Harmonic Content.From F

32、ig.5, a conclusion can be received that the quality factor of passive filter and the active power filter gain directly affect the compensation performance of hybrid active power filter when the tuned frequency is fixed. If the quality factor of passive filter is not properly selected, the active power filter gain K must been increased to obtain the satisfying compensation performance.Fig. 5 Hybrid active power filter frequency response for different values of passive filter quality factor Q.Fig.6