Charger ni a Charge galaw ai ladat gaw hpa rai ta?

Ndai daw hta, langai maga hte lahkawng maga charger circuit ni a topological structures ni a ga shadawn ni hpe garan nna madun dan ai hku nna, charger ni a charge galaw ai npawt tara hpe madi madun da ai.

Charger gaw AC hte DC lapran na galai shai ai lam hpe power electronic jak ni hku nna hkam sha lu ai. N mai koi gam ai, power electronic jak ni gaw reactive power hpe shapraw ya nna, grai law ai reactive power gaw power grid voltage galai shai ai lam, n-gun jaw ai lam a hkam kaja lam yawm mat ai, line sum ai lam ni law wa shangun ai. Circuit langai hta active power hte dan dawng ai power lapran na ratio hpe power factor ngu nna lachyum shaleng da ai. Hpang jahtum-user kaw nna power grid de jaw ai grai law ai reactive power hpe pat shingdang na matu, nta hte bungli galaw ai wan n-gun lang ai lam lahkawng yan a matu power factor hpe grai pat shingdang ai lam ni hpe galaw ai, law malawng gaw 0.8~0.9 hta n yawm ai. Ladat langai mi gaw PFC (Power Factor Correction) hpaji masa rai nna, n-gun atsam electronic jak ni kaw na harmonic n san seng ai lam hpe yeng seng kau ya lu nna, shang wa ai n-gun atsam hpe grau kaja hkra galaw ya lu ai.

Figure 11-21 Single-stage PFC converter based on full-bridge structure

Ndai single-stage full-bridge PFC hpaji masa gaw asan sha re ai hkrang masa, n-gun kaba ai, n-gun kaba ai-hpang jahtum na excitation hte n-gun kaba ai transformer zawn re ai akyu ni hpe jaw ya ai majaw, n-gun kaba ai jai lang ai lam ni a matu htuk manu ai. Hkum tsup ai-bridge hkrang hpe madung tawn nna, -stage hkum tsup ai-bridge PFC galai shai ai ladat hpe sumla 11-21 hta madun da ai. Mungdaw lahkawng hta bungli galaw nga ai:lahta hte lawu lata n-gunHtenhtan shai ai lata woi hkawm ai lam. Lawu hte lawu na arm conduction galaw ai shaloi, shang wa ai inductor kata na current gaw rawt jat wa ai. N bung ai lata hte hkawm sa ai aten hta, shang wa ai inductor kata na current gaw hkrat sum mat ai. Dai hkang ai ladat gaw, shang wa ai inductor a charge hte discharge cycle kata na ntsa hte lawu na arm conduction aten a ratio (duty cycle) hpe gram lajang nna, shang wa ai inductor kata na n-gun a galu kaba ai lam hpe gram lajang ya ai, shang wa ai n-gun hpe shang wa ai n-gun hte sine wave in phase byin shangun ai. Ndai lam gaw hpang jahtum e, -order tsaw ai harmonics ni hpe yeng seng kau ya nna, power factor hpe sharai la lu ai.

N-gun lwi ai lam hpe sawk sagawn yu yang, ntsa hte lawu na arm conduction galaw ai aten hta, high-frequency transformer hku nna voltage gaw 0 rai nna, pru wa ai filter capacitor gaw load hpe n-gun jaw ai hpe mu lu ai; n bung ai lata hte hkawm sa ai shaloi, -frequency kaba ai transformer gaw, shang wa ai inductor hta bang da ai n-gun hpe htawt sit nna, dai hpe jaw ya ai.

Input cable kaw na n-gun hpe transformer a lahkawng ngu na maga de htawt sit ya ai. High-frequency hpe gram lajang nna filter galaw ngut ai hpang, load hpe n-gun jaw ya ai. Dai system a duty cycle hpe hkang ai hku nna, pru wa ai voltage hpe galai shai lu nna, pru wa ai voltage hpe rated value hta sha tawn da lu ai. Langai bungli galaw ai aten laman, shang wa ai inductor gaw charge hte discharge lahkawng hpe ngut kre hkra galaw nna, high-frequency transformer hpe lahkawng lang n-gun jaw ai, n-gun jaw ai lam lahkawng gaw nhtan shai ai hku galaw ai. Ndai gaw magnetic core hpe push-pull ladat hku jai lang nna, galai shai ai jak a magnetic core jai lang ai lam hpe grau kaja hkra galaw ya ai.

Hkrang 11-22 hta, lahkawng maga na charger hpe charge galaw na matu hte charge galaw na matu, madung circuit a topological hkrang hpe madun da ai, dai hta, masum-phase daw mi -bridge voltage-source PWM rectifier hte lahkawng maga na DC/DC galai shai ai jak ni lawm ai.

Figure 11-22 Topology of the main circuit of an electric vehicle charging station based on V2G technology

Three-phase AC n-gun npawt ni hpe bungli galaw ai shara ni hta n-gun kaba -voltage hte n-gun kaba -ni lang ai shara ni hta lang ma ai. Bidirectional ngu ai gaw, n-gun atsam gaw grid maga kaw nna mawdaw a battery de, shing nrai, battery maga kaw nna grid maga de lwi wa mai ai. Ndai sumla hta lawm ai three-phase half-bridge voltage-source PWM rectifier gaw, lahkawng maga de n-gun dat ai PWM rectifier amyu langai rai nna, lahkawng maga de n-gun dat lwi ai lam hpe lu la ai, lawan ai hku n-gun dat ai lam hpe lu la ai, kaja ai ngang grin ai lam hpe lu la ai zawn re ai akyu ni nga ai.{8}} hta nga ai shaloi .gram lajang ai masa, grid maga kaw nna n-gun pru wa ai, n-gun gaw sinusoidal rai nna, shi a phase gaw grid voltage hte maren sha rai nga ai; hta bungli galaw ai shaloishamu shamawt nga ai nhtang wa ai masa, wan jak mawdaw battery hta bang da ai n-gun hpe power grid de bai nhtang jaw nna, grid-maga na wan n-gun hte wan n-gun waveform lahkawng yan gaw sinusoidal rai nna, phase shai hkat ai lam gaw 180℃rai nga ai.

Bidirectional DC/DC converter gaw lawan ai hku bai htang lu ai, n-gun galai shai ai atsam grai law ai, n-gun n law ai jak ni zawn re ai akyu ni nga ai. Hkrang 11-22 hta madun da ai hte maren, charger gaw wan jak mawdaw a battery hpe charge galaw nga ai shaloi, switch .S1woi awn nga ai, galai nga aiS2galoi mung off nga ai. Dai majaw, lahkawng maga na PWM rectifier gaw gram lajang ai masa hta bungli galaw nna, lahkawng maga na DC/DC galai shai ai wa gaw step-down buck masa hta rai nna, n-gun gaw grid maga kaw nna battery maga de lwi pru wa ai; Battery n-gun yawm wa ai shaloi, galai kau uS2pat mat sai, galai kau uS1n-gun dat ai shaloi, lahkawng maga na DC/DC galai shai ai wa gaw step-up boost masa hta rai nna, lahkawng maga na PWM galai shai ai wa gaw active inversion masa hta bungli galaw nga ai, battery kata kaw bang da ai n-gun hpe galai shai ai wa hku nna power grid de bai nhtang jaw ai.