太陽光発電を大量に配電系統へ導入するための STATCOMに …

1 STATCOM .. A Study of Voltage Quantity Enhancement by STATCOM for Facilitating the STATCOM . Integration of Large Amount of Dispersed PV Generations to Distribution Grid A Study of Voltage Quantity Enhancement by STATCOM for Facilitating the 1 2 3. Integration of Large Amount Kazutoshi CHUBACHI . of Dispersed PV. Yuma TAKADA . Generations to Distribution Guohong WU . Grid 1 2 3. Kazutoshi CHUBACHI Yuma TAKADA Guohong WU . Abstract Along with the increasing common concerns on global warming and exhaustion of fossil fuels, renewable energy generation is paid great attentions and may be rapidly introduced into the existing power grid not only at the power transmission network sides but also at the distribution feeder sides. However, with more and more renewable energy generations being integrated into the distribution system, the power fluctuation of these generations may cause some problems in distribution voltage and then aggravate the power supply quantities.

2 For this purpose, in this work, we have made an approach aiming at obtaining mitigation effects of both rise and imbalance in the distribution voltage, which is caused by integration of large amount of PV generations, by use of a single STACOM device - one type of the FACTS (Flexible AC. Transmission System) devices based on the application of power electronic technologies. STATCOM. model and its control systems, which have the functions of both mitigating the voltage fluctuations and compensating the voltage imbalances, are designed and introduced into a typical power distribution system model with large number of PV generations at the load sides. Simulation results have illustrated that the application of the designed STATCOM can bring about satisfied improvement of rise and imbalance in the voltage simultaneously for a distribution system with renewable energy generations.

3 STATCOM , . Key Words STATCOM, PV, distribution grid, rise in voltage, voltage imbalance, voltage quantity . , .. 2020 90 . 25 .. (1) .. (2) . FACTS Flexible AC Transmission System . SVC Static Var Compensator . (3)(4) .. 985-8537 1 13 1 SVC . e-mail: 2.. 3.. 2012 11 26 . 59 . P059-065 214- - .indd 59 2013/03/22 16:12:51.. STATCOM .. SVC FACTS 2 2 . STATCOM Static Synchronous Compensator . STATCOM .. (1) (5) SVC . STATCOM . 6 8 . STATCOM (6) STATCOM . STATCOM . (7) (9) 2 STATCOM . PWM . (10) . STATCOM .. Load Inverter . IL Transformer I.. E . PSCAD/EMTDC .. STATCOM Harmonic Vs Filter Inverter 2.. Distribution STATCOM . System . STATCOM System Configuration of STATCOM.. STACOM 1 STATCOM . (6)(7)(11)~(13) STATCOM . STATCOM 3 . 1[MVar] . [kV] . [ ] [mH].

4 STATCOM .. 40[ F] . STATCOM 1 .. STATCOM . STATCOM GTO .. IGBT IGBT .. STATCOM .. STATCOM 2 . Journal of JSES 60 2013 . P059-065 214- - .indd 60 2013/03/22 16:12:51. STATCOM . 2 . Table 1 Specifications of STATCOM .. R a t e d C a p a c ity 1 [M V a r].. R a t e d A C V o lt a g e 6 .6 [k V ].. R a t e d D C V o lt a g e 0 .6 7 5 [k V ]. W in d in g F a c to r PWM . o f T ra n sfom e r 6 .6 /1 .0 8 3 [k V ] PWM . R a ted A C C u rren t 0 .0 8 7 5 [k A ] . F requ en cy 5 0 [H z ]. FS . D C C a p a c ito r 8 [m F ].. C a r r ie r 5 0 0 0 [H z ]. F requ en cy dq . M u ltip le x L a y e r 2 . T ra n s fo rm er Y - . Im p e d a n ce 2 7 .7 3 [m H ] d q . o f T ra n s fo rm er . H a r m o n ic F ilt e r 4 0 [ F ]. dq . P o w e r D e v ic e IG B T.

5 (1) , dq (2) . Load Current IL IL n ILnd,ILnq dq (3) . Compensation I Symmetrical Ip,In 3 dq Ipd,Ipq Current Coordinates Ind,Inq * p=Positive Phase Transformation n=Negative Phase System Vs Transformation Vsp,Vsn Vspd,Vspq 1 1 . Voltage Vsnd,Vsnq 1 I a (1). i 2 2 2 I . i . 3.. 3 b . 3 . wt 0 I . System Reactive Current Control of 2 2 c . Voltage System Voltage Positive Phase RMS Constant Control Ipq Vspq System . Voltage - Ipq* - Vipq Aa a I pd cos( t 2 ) sin( t 2 ) i (2). Reference +. I . +. Active Current . pq sin( t ) cos( t ) i . Ba a DC DC Voltage Control of Voltage Constant Control Ipd Vspd Positive Phase 2 2 . DC Ipd* Vipd - Three Phase PWM. Voltage - . Reference + +. Reactive Current Voltage Ab Vector b Gate I nd cos( t 2 ) sin( t 2 ) i (3).

6 Computation Control of Computation Bb Control I . nq sin( t ) cos( t ) i . b ILnq Inq Vsnq Negative Phase Vinq 2 2 . 0 - Inq* - + + Active Current Control of Ac ILnd Ind Vsnd Negative Phase c t . Vind Bc 0. - Ind* - c t /2 d . + +. dq d q . Block Diagram of Control System for STATCOM .. 1) . 2) .. 1) 2 . PWM . 2) 3 STATCOM .. STATCOM .. q q . System Connected with a STATCOM.. 3 VS STATCOM . d Vi (4) (4) dq . dq (5) . (6) . 61 . P059-065 214- - .indd 61 2013/03/22 16:12:52.. STATCOM 2 Load1 Load2 . 1 . Vsa Ia Via (4). V L d I V 30[MVA] 1 . sb dt b ib 3[MVA] 10 . Vsc Ic Vic .. BUS2 [kV] . d [ ] . Vid Vsd L dt I d LI q (5) .. Viq Vsq L d I q LI d (Load12~load21) . dt . 1 . 300[kVA] 100[kVA] . d . 2030 . V ipd V spd L I pd LI . dt pq 5300 [kW] . d 3[kW] 1 200.

7 V ipq V spq L I pq LI . 600[kW] . pd dt (6). d . V ind V snd L I nd LI nq . dt ab 38 bc ca d . V inq V snq L I nq LI nd Node5 . dt .. Vipd Vipq Vind Vinq STATCOM ab bc 33% ca 33% . d q . Vspd Vspq Vsnd Vsnq d . q 4 . Ipd Ipq Ind Inq STATCOM . d q 1 STATCOM .. (7) (9) 101 6[V] . (9) 3 STATCOM . Node6 . 1 0 1 0 . 0 1 0 1 . A a . B 1 1 3 V . 0 . a 2 2 ipd . 5 MPPT . A b 2 3 1 V ipq . (7). 0 1 .. Bb 3 2 2 V ind . A c 1 3 V inq . 1 0 . B c 2 2 .. 0 3 1 .. 1. 2 2 2011 5 1 12 ~12 30 . ( 1 ) . B. A 2 B2 , tan 1 (8) . A . 1% .. a sin( t a ) . V ia* 6. * 2 (9) 2% . V ib b sin( t b ) . V * 3 6 ab [kW] . ic 4 . c sin( t ) bc [kW] ca [kW] . 6 . c 3. 10[sec] .. 4 . PSCAD/EMTDC .. 3 5[ sec] . Journal of JSES 62 2013 . P059-065 214- - .indd 62 2013/03/22 16:12:52.

8 STATCOM . Load1,Load2: Line1: Load12~Load21. Line2 PV System Load3 Constant Power Load of Unit: BUS1 Load1 BUS2 Constant Power Load Unit Capacity: a Line and b Line : Line3 Load4 [MW] Line2~Line10: [kW] a Line and b [kVA]. [kVar] b Line and c [kVA]. Load2 Line4 Load5 [MVar] b Line and c Line : Line11: c Line and a [kVA]. Line5 Load3~Load11: [kW]. Load6. [kVar]. Constant Power Load Line6 c Line and a Line : Line1 Load7 [MW] Line12~Line20: [kW]. Line7 [kVar]. 22 Load8 [MVar] 22[kV] [kV]. Line8 Load9. Distribution Substation Line9 Load10. Tap Changing Point Line10 Load11. Transmission Line Impedance of Line1 6600/105[V] 6450/105[V]. R [ /km]. XL [ /km] STATCOM Capacity: STATCOM 1[MVar]. Transmission Line Impedance of Line2~Line20 Node1 Node2 Node3 Node4 Node5 Node6 Node7 Node8 Node9 Node10.

9 R [ /km] Line11 Line12 Line13 Line14 Line15 Line16 Line17 Line18 Line19 Line20. XL [ /km]. Frequency of Power System: Load12 Load13 Load14 Load15 Load16 Load17 Load18 Load19 Load20 Load21. 50[Hz]. Power System Model A ctiv e P ow er of P V G en era tion [kW ]. 60 114. N o .1 P V G en era tion betw een a L in e a n d b L in e ab Line to Line Voltage 55 N o .2 P V G en era tion betw een b L in e a n d c L in e 113 bc Line to Line Voltage Customer Voltage at Node6[V]. N o .3 P V G en era tion betw een c L in e a n d a L in e 112 ca Line to Line Voltage 50. 111. 45 N o .1. 110. 40. 109. 35 108. N o .2 N o .3. 30 107. 25 106. 20 105. 15 104. 10 103. 5 102. 0 101. 2 4 6 8 10 100. T im e[sec] 2 4 6 8 10. Time[sec]. Active Power of PV Generation in Each Node.

10 Line-to-Line Voltage (RMS) of Node6 in case without STATCOM. STATCOM . 114. Node6 113. ab Line to Line Voltage bc Line to Line Voltage Customer Voltage at Node6[V]. ca Line to Line Voltage 6 7 6 STATCOM . 112. 111. 110. ab bc 109. 101 6[V] 108. 107. STATCOM 106. 105. 103[V] 7 104. 103. [V] 102. 101. 103[V] 100. 2 4 6 8 10. Time[sec].. Line-to-Line Voltage (RMS) of Node6 in case STATCOM . with STATCOM.. 10 ( ) .. Node10 . 10 . STATCOM Nodel0. 8 9 8 V2 (10). K (%) 100. STATCOM V1. 9. V1 V2 . STATCOM 10 STATCOM . 63 . P059-065 214- - .indd 63 2013/03/22 16:12:53.. 3% 11 . STATCOM STATCOM . 2% 11 STATCOM .. STATCOM 50% 11 6 STATCOM . STATCOM STATCOM .. 3[sec] .. STATCOM [MVar] . STATCOM . 10% 1[MVar] . [MVar] 11 b . 10 [MVar] . Line to Line Voltage of Node10[kV].