MATLAB Simulation of V2G, G2V Operation in Electric Vehicle Charger (3 Phase Model). — Transcript

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1. 0:00[Music]
2. 0:12our today's discussion is on matlab
3. 0:14simulation of a bi-directional circuit
4. 0:16used to charge the battery from the grid
5. 0:18and discharges the battery to the grid
6. 0:20this model can also be used as a
7. 0:22demonstration of v2g and g2b operation
8. 0:24in the electric vehicle
9. 0:27this is the basic circuit topology of a
10. 0:29three-phase electric vehicle battery
11. 0:31charger
12. 0:32at the input we have a front-end
13. 0:34converter also known as active rectifier
14. 0:36which converts the ac grid voltage to dc
15. 0:38and maintains a constant voltage across
16. 0:40the dc bus
17. 0:42then we have a bi-directional bug boost
18. 0:44converter used to control the battery
19. 0:45current during charging and discharging
20. 0:47operation
21. 0:49now i will give you the specification of
22. 0:51the complete system
23. 0:52grid voltage 415 line to line rms at 50
24. 0:56hertz
25. 0:57the filter inductance is 3 milli henry
26. 0:59and capacitance is 30 microfarad
27. 1:02in the inverter bridge i used igbts
28. 1:05value of bus capacitance is 5600
29. 1:07microfarad mosfet is used in the buck
30. 1:10converter
31. 1:11bug filter inductance is 20 ml henry
32. 1:14output capacitance is 0.625 microfarad
33. 1:18battery nominal voltage is 360.
34. 1:21switching frequency of both the
35. 1:22converter is 10 kilohertz
36. 1:24total rated power is 10 kilowatt
37. 1:27now i will show you the control block
38. 1:28diagram used in both the front end
39. 1:30converter and bi-directional bug boost
40. 1:32converter
41. 1:34this is the control block diagram of the
42. 1:36three-phase front-end converter
43. 1:38this controller is used to regulate 800
44. 1:40volt dc across the bus
45. 1:43this is the control block diagram used
46. 1:45in the bi-directional bug boost
47. 1:47converter
48. 1:48this controller is used to regulate the
49. 1:50battery charging and discharging current
50. 1:53now we open the math lab and start doing
51. 1:55the simulation
52. 2:00add a three-phase voltage source
53. 2:02the source we are using is the grid
54. 2:07set phase to phase voltage 415
55. 2:12frequency 50 hertz
56. 2:16set source resistance and inductance
57. 2:17very small values
58. 2:22and base voltage 415
59. 2:26add a three-phase voltage current
60. 2:27measurement block
61. 2:35here i am measuring face to ground
62. 2:36voltage using label vabc and i am not
63. 2:39measuring the current
64. 2:44connect this block to the voltage source
65. 2:52now we start connecting the lcl filter
66. 2:55add a series rlc branch
67. 3:01make it as inductance and set the value
68. 3:035 millihenry
69. 3:10connect the inductor in all the three
70. 3:12phases
71. 3:21copy this block
72. 3:23make this branch as capacitor and set
73. 3:25the value 30 microfarad
74. 3:37connect the capacitor in all the three
75. 3:39phases
76. 3:46now connect the inverter side filter
77. 3:48inductor
78. 3:55now add a current measurement block to
79. 3:57measure the inverter current
80. 4:03change its direction
81. 4:09and also flip the block up down
82. 4:17connect this in all the phases
83. 4:25add a go to block
84. 4:29change its direction
85. 4:34give the tag name ir
86. 4:43similarly connect i y and ib
87. 5:03connect the go to tags into the current
88. 5:05measurement block
89. 5:14now we create the three-phase bridge
90. 5:16using igbts
91. 5:20uncheck this box
92. 5:34adder import
93. 5:37connect to the gate terminal
94. 5:41name it as pwm1
95. 5:46similarly connect to all the other gate
96. 5:48terminals
97. 5:49make sure that the name on the port
98. 5:51appears correctly from pwm1 to pwm6
99. 6:09now add a connection port
100. 6:16keep the port location left
101. 6:22name it as vr
102. 6:28similarly connect vy and vb and change
103. 6:31the port name also
104. 6:43keep the alignment left for both
105. 6:50now connect the port across the dc
106. 6:51terminals
107. 7:04keep its alignment right
108. 7:12name it as vdc plus
109. 7:19keep this alignment also right
110. 7:24and name this 1vdc minus
111. 7:30now add a series rlc branch
112. 7:35this is the dc bus capacitance and its
113. 7:37series resistance
114. 7:48set the resistance 1 milli ohm and
115. 7:49capacitance 5600 microfarad
116. 7:55and set initial voltage 800
117. 8:04create subsystem from the selection
118. 8:08and delete all unwanted connections
119. 8:37now connect the three-phase bridge to
120. 8:39the lcl filter
121. 8:55now add up from block and connect it as
122. 8:57pwm1
123. 9:13similarly connect all the 6 pwm signals
124. 10:20now add a voltage measurement block
125. 10:22this is used to measure the dc bus
126. 10:24voltage
127. 10:32add a go to block
128. 10:40name it as vdc
129. 10:43add a mosfet and make the bug converter
130. 10:51uncheck this box
131. 11:15add a series rlc branch
132. 11:23set the resistance
133. 11:250.0001 and inductance 20 milli henry
134. 11:39copy the rlc branch
135. 11:49here set the resistance
136. 11:510.0001 and capacitance 0.625 microfarad
137. 12:05now add a from blog
138. 12:14name it as bug
139. 12:20connected to the gate terminal
140. 12:25and similarly connect it to the other
141. 12:26gate terminal and name it as boost
142. 12:35now connect the battery
143. 12:42set nominal voltage 360 rated capacity
144. 12:45300 ah initial soc 50 and response time
145. 12:49one second
146. 12:58flip the battery block left right
147. 13:13now add a bus selector
148. 13:26add soc voltage and current into the bus
149. 13:37add a go to blog
150. 13:42name it as soc
151. 13:48and similarly connect the battery
152. 13:50voltage and current at the output of bus
153. 13:52selector
154. 14:10name it as ibat
155. 14:16and name this one v-bat
156. 14:22now we start connecting the inverter
157. 14:23controller blocks
158. 14:25first adder from blog
159. 14:33name it as vabc which is same as the
160. 14:35grid voltage
161. 14:38add a abc to alpha beta block
162. 14:45add alpha beta to dq block
163. 14:54add another from block
164. 15:05name it as omega t
165. 15:07where omega t is the output of pll
166. 15:12add a dmx
167. 15:20now add a go to block
168. 15:31name it as vd
169. 15:35and this 1vq
170. 15:40copy this from blog
171. 15:57name this one alpha beta and this signal
172. 15:59will be used as the input to pll
173. 16:04now we connect the current
174. 16:05transformation blocks take all the three
175. 16:08current signals
176. 16:28add a marks
177. 16:33make number of inputs 3
178. 16:41add abc to dq transformation block
179. 17:03make number of outputs three
180. 17:07this one also need to make three
181. 17:14copy these from blocks
182. 17:26name it as id
183. 17:31and name it as iq
184. 17:35now we connect the pll blocks
185. 17:45add alpha beta to dq block
186. 17:54copy this demux
187. 17:59add a sum blog
188. 18:09make it sign minus plus
189. 18:18add a constant
190. 18:24set the value zero
191. 18:29at apid controller
192. 18:37make the controller pi and set kpki
193. 18:39values
194. 18:53add an integrator
195. 19:02this is the output of pll and this has
196. 19:04to go to the other transformation blocks
197. 19:13now we start connecting the dc bus
198. 19:15voltage controller
199. 19:17add a constant block
200. 19:24the reference voltage 800
201. 19:30add a sum block
202. 19:38the sine plus minus
203. 19:43take the voltage signal and connect to
204. 19:45the sum block
205. 19:48add apid controller
206. 19:56make the controller pi
207. 19:59set kp 0.5 and ki5
208. 20:08copy the sum block and pid controller
209. 20:24here give kps 25 and ki 500
210. 20:36here change the sign to plus
211. 20:41add a game block
212. 20:52give its value 2 into pi into 50 into 10
213. 20:54e rise to minus 3.
214. 21:07connect iq to the game block
215. 21:27change its name to vd
216. 21:34add another gain block
217. 21:40set the value to
218. 21:43add a product blog
219. 21:51change the number of inputs
220. 21:55connect dc voltage to the product block
221. 22:03now to make you access current
222. 22:04controller copy and paste all these
223. 22:06blocks
224. 22:22add a constant block
225. 22:28set the current reference as 0
226. 22:34copy this block
227. 22:43rename this to id
228. 22:50and rename this to vq
229. 22:57change it sign to plus minus
230. 23:02now we start making the battery current
231. 23:04controller
232. 23:05adder from block
233. 23:13select ibat from the drop-down list
234. 23:20add sum block
235. 23:26change sine plus minus
236. 23:32add a constant block
237. 23:38set the battery current reference 30
238. 23:43add apid controller
239. 23:52make the controller pi
240. 23:54set kp 0.005 and ki-10
241. 24:00limit the output between 0 and 0.95
242. 24:09add a dc-dcpwm generator
243. 24:16set switching frequency 10 kilohertz
244. 24:22now connect the output of pwm block to
245. 24:24the respective gate terminals of the
246. 24:25mosfet
247. 24:29add a logical operator
248. 24:34select not from the list
249. 24:44now add a mux
250. 24:49make number of inputs 3
251. 24:52connect the controller outputs to the
252. 24:58mux add a dq to abc transformation block
253. 25:10copy the pll output and connect to this
254. 25:12block
255. 25:17add a two level pwm generator
256. 25:27set switching frequency 10 kilohertz
257. 25:38added mix
258. 25:44set number of output 6.
259. 25:55now connect these outputs to the
260. 25:56respective pwm signals of the inverter
261. 26:32now add a power measurement block
262. 26:44add grid voltage and current to this
263. 26:46block
264. 27:08add a scope
265. 27:15open the scope settings
266. 27:19change number of inputs and layout in
267. 27:21the scope settings
268. 27:31connect the grid voltage and current to
269. 27:32the scope
270. 27:40add another scope to view the dc bus
271. 27:41voltage
272. 28:03add displays to view the active and
273. 28:05reactive power taken from the grid
274. 28:20now open the configuration settings
275. 28:26set solver type or de23t
276. 28:33add a power ghee block
277. 28:39set simulation type discrete and
278. 28:41sampling time 1 micro seconds
279. 28:48here i made a mistake in the connection
280. 28:50so i will correct it now
281. 28:56now set simulation time one second and
282. 28:58run the simulation
283. 29:17here you can see that the active power
284. 29:19is positive which means that the power
285. 29:20flow is from the battery to the grid
286. 29:23so the system is working in the v2g mode
287. 29:27now let's wait to run the simulation
288. 29:29100.
289. 29:42now i will show you the voltage and
290. 29:43current waveforms
291. 29:54as you see both the voltage and current
292. 29:55are aligned in phase
293. 29:57which means we are injecting the power
294. 29:59into the
295. 30:06grid this is the dc bus voltage during
296. 30:09v2g operation
297. 30:18now to make the system work in the g2v
298. 30:20mode that is charging the battery from
299. 30:21the grid we need to make the current
300. 30:23reference negative
301. 30:28now again run the simulation
302. 30:54this is the voltage and current during
303. 30:55g2v mode
304. 31:00as you see both the voltage and current
305. 31:02are aligned out of phase
306. 31:04which means power is taken from the grid
307. 31:09this is the bus voltage during g2v mode
308. 31:13and here you can see that the power is
309. 31:15negative which means power is taken from
310. 31:17the grid to charge the battery
311. 31:20this is the end of this presentation
312. 31:22thanks for watching
313. 31:33you