Ongororo pamusoro peTopology uye Mashandisirwo Ekutonga eMedium-High Voltage Power Electronic Transformers III

3.3 Topology Yakasungirirwa Yakawanda

Nzvimbo ine Neutral Point Clamped (NPC) ine mazinga akawanda inoratidzwa. Kunze kwenzvimbo ine diode-clamped NPC, nzvimbo dzine NPC dzinosanganisirawo mhando ye flying capacitor uye mhando ine hybrid clamped, pakati pezvimwe. Zvisinei, nekuda kwehuwandu hukuru hwe capacitor, nzvimbo dzine NPC dzichiri kushandisa zvakanyanya passive kana active switching devices passive kana active switching devices. Tichitora nzvimbo ine diode-clamped multilevel semuenzaniso, mune three-phase rectifier stage topology, phase leg yega yega ine cascaded switching transistors uye clamping diodes, dzakabatana zvakafanana ne single high-voltage DC bus. Mabhuku akakurudzira single-phase PET topology ine rectifier stage ichishandisa four-level diode-clamped circuit. Single high-voltage DC bus inoteverwa ne input-series-output-parallel DABs, sezvakaratidzwa. Iyi nzvimbo inogona kuwedzerwa kuita three-phase structure, uye huwandu hwe voltage levels hunogona kuchinjwa zvichienderana ne device standing voltage levels uye high-voltage side voltage level. Kufanana neMMC topology, NPC topology inogonawo kushandiswa panguva yekupatsanurwa, ichibatanidza bhazi reDC rine voltage yakakwira kune Transformer yekuzviparadzanisa, sezvakaratidzwa. Mabhuku akashandisa chigadziri cheNPC chine madhiode matatu-level kudivi rine madhiode akawanda chechigadziri cheLLC resonant, vachichisimbisa pamuenzaniso we166kW/2kV~400V. Mabhuku akashandisa chigadziri cheNPC chine madhiode matatu-level kuDAB ine madhiode matatu-level, zvichizadzisa simba reDAB uye hunhu hwemazuva ano.

Kana NPC topology ikashandiswa sechikamu chekugadzirisa magetsi, haidi mabhazi eDC akaparadzana, zvichideredza huwandu hwema transformer echikamu chekuparadzanisa magetsi. Uyezve, muzvivakwa zvematatu-phase, hapana voltage ripple ine mitsara miviri pabhazi. Zvisinei, nekuti clamped topology inoda huwandu hwakawanda hwezvishandiso zvekusunga, huwandu hwezvishandiso zvekusunga hunowedzera sezvo huwandu hwemazinga huchiwedzera, zvichiita kuti kuwedzera kwemazinga kuve kwakaoma uye kuwanda kwemagetsi kuve kwakaoma kuwana. Panyaya yekudzora, ma currents anoyerera mu capacitor yega yega ye NPC converter akasiyana, zvichikonzera kusawirirana kwemagetsi e capacitor. Kune NPC topology dziri pamusoro pematanho matatu, hapana algorithm inoshanda yekuenzanisa magetsi. Pamusoro pezvo, nguva dzisingaenderane dzekushanda kwema switch mukati nekunze kwemaoko dzinotungamira mukupisa kusina kufanana, izvo zvinogona kugadziriswa chete nekushandura topology yedunhu rese.

Matambudziko akawanda anokonzerwa nekuwedzera kwemazinga zvinoreva kuti maNPC topology anogona kushandiswa chete mumazinga epakati nepakakwirira emagetsi kuburikidza nekubatanidza zvishandiso kana kushandisa zvishandiso zveSiC zvine voltage yakawanda. Zvisinei, pamazinga emagetsi akaderera, zvichienzaniswa neH-bridge topology imwe chete, NPC ine mazinga matatu ine hafu chete yesimba remagetsi uye voltage stress pane transistor yega yega inochinja, ukuwo ichiburitsa mazinga emagetsi akawanda, zvichikonzera zvinodiwa zvekusefa zvinobuda zvishoma. Ine mabhenefiti makuru ekushandiswa sedanho re inverter padivi re low-voltage rePET. Semuenzaniso, mabhuku akashandisa NPC ine mazinga matatu e diode-clamped sedanho re inverter rePET kutyaira mota ine mativi matatu, ichiita bvunzo yekuongorora uye ichiwana mashandiro akanaka emota uye ruzha.