Makarantar Yawan Kirki na HVDC Tabbatar

Takaitaccen Ma'aikata da Jikin Tashar Dukkana na HVDC

Takaitaccen Ma'aikata da Jikin Tashar Dukkana na AC

• Ingantaccen: Takaitaccen ma'aikata da jikin tashar dukkana na AC ba su zama na musamman don HVDC saboda wani abu daban-daban da kuma tsari suna daban-daban.
• Tsari: Jikin tashar dukkana na AC yana da tsari mai yawa da jikin tashar dukkana na DC. A cikin gaba-gabon, jikin tashar dukkana na AC yana haɗa da waɗanda suka samu tsari mai yawa idan an yi aiki, amma ba a cikin gaba-gabon bane ne.

Jikin Tashar Dukkana na HVDC

• Wannan Tsari Yadda Ake Yi Aiki: Jikin tashar dukkana na HVDC ya kamata a yi aiki mafi yawan lokaci saboda ingantaccen da ke kan elektronikin jikin tashar dukkana da kuma muhimmanci.

Muhimman Fasaha da Su Fadada

1. Fasahin Mafi Yawanci:

   • Yana hanyar da shi a cikin aiki masu yawa.

2. Fasahin Na Biyu:

   • Yana hanyar da shi a cikin lokacin da aka fara aiki ta hanyar jikin tashar dukkana.

3. Fasahin Hanyar Da Shuka Iya:

   • Yana hanyar da shi a cikin iya aiki na jikin tashar dukkana da kuma shirya iya na biyu daga gridin DC.

Muhimman Tsari Don Jikin Tashar Dukkana na Hybrid

1. Hayar Aiki (Tf):

   • Lokacin da ayyukan shiga network ya faru, wanda yake taimaka aiki ta hanyar jikin tashar dukkana.

2. Tsari Don Koyarwa:

   • Tsari daga hayar aiki har zuwa lokacin da systemin koyarwa ta koyar da aiki.

3. Tsari Don Bayyana:

   • Tsari daga lokacin da aka koyar da aiki har zuwa lokacin da systemin koyarwa ta bayyana wadannan jikin tashar dukkana za a buƙata.

4. Tsari Don Aiki:

   • Tsari daga lokacin da jikin tashar dukkana ya faru har zuwa lokacin da ya buƙata.

5. Tsari Don Buƙata (Tint):

   • Tsari daga hayar aiki har zuwa lokacin da jikin tashar dukkana ya faru da iya da yawa don taimaka aiki ta hanyar jikin tashar dukkana.

6. Tsari Don Commutation (Tcom):

   • Tsari daga lokacin da current a fasahin mafi yawa ya faru har zuwa lokacin da ya buƙata, ko kuma ya faru da iya da yawa don stage na biyu a yi aiki.

7. Tsari Don Buƙata (Tclr):

   • Tsari daga hayar aiki har zuwa lokacin da current na line na DC ya buƙata, ko kuma ya faru da I_knee varistors.

8. Tsari Don Aiki Ta Hanyar Da Shuka Iya (Tlim):

   • Tsari daga lokacin da jikin tashar dukkana ya faru har zuwa lokacin da ya faru aiki ta hanyar da shuka iya ta hanyar jikin tashar dukkana.

ABB Designed Proactive Hybrid Circuit Breaker (PHCB) HVDC

Bayanin Design

Proactive Hybrid Circuit Breaker (PHCB) HVDC, wanda ABB ta design, yana da fasahohin biyu da su mutanen:

1. Path na Current Masu Yawa:

   • Mechanical Switch: Yana buƙata a cikin aiki masu yawa.
   • Load Commutation Switch (LCS): Wuri series stack of semiconductor switches wanda ake faru a cikin aiki masu yawa.

2. Main Current Breaking Element:

   • Main Breaker: Wuri series stack of semiconductor switches wanda ake buƙata a cikin aiki masu yawa.

3. Fasahin Hanyar Da Shuka Iya:

   • Yana hanyar da shi a cikin fasahin biyu don taimaka aiki na jikin tashar dukkana. Wannan yana taimaka a faru sections of the secondary branch independent of each other. Wannan feature yana taimaka jikin tashar dukkana a yi aiki ta hanyar da shuka iya a cikin wasu hali.

Aiki Masu Yawa

• Disconnector: Buƙata
• LCS: Faru
• Main Breaker: Buƙata

Aiki a Lokacin Da Aki Faru

1. Koyarwa Ta Aiki:

   • LCS yana buƙata.
   • Main breaker yana faru.
   • LCS yana taimaka a faru current daga fasahin mafi yawa zuwa fasahin na biyu.
   • LCS zai iya faru kafin a faru aiki, wanda yake taimaka algorithmin koyarwa ta yi aiki parallel with the circuit breaker's operation.

2. Transfer na Current:

   • Idan kowane current ya faru through the main breaker, high-speed mechanical disconnector yana buƙata.
   • Idan mechanical switch ya buƙata, main circuit breaker yana buƙata, main breaker current yana buƙata, and the line energy yana shirya in the varistors.
   • The relatively slow series residual current disconnecting circuit breaker yana amfani da ita don buƙata leakage current through the main breaker and associated devices, which may be significant depending on how the energy absorption branch is designed. This switch also provides full isolation.

Misalai

Figure 3 yana nuna typical fault current waveform with labeled time and current ratings. The dynamics have been exaggerated to allow the definitions to be drawn easily:

• Hayar Aiki (Tf): Lokacin da hayar aiki ta faru.
• Tsari Don Koyarwa: Tsari daga Tf zuwa lokacin da aka koyar da aiki.
• Tsari Don Bayyana: Tsari daga lokacin da aka koyar da aiki zuwa lokacin da aka bayyana wadannan jikin tashar dukkana za a buƙata.
• Tsari Don Aiki: Tsari daga lokacin da jikin tashar dukkana ya faru har zuwa lokacin da ya buƙata.
• Tsari Don Buƙata (Tint): Tsari daga Tf zuwa lokacin da jikin tashar dukkana ya faru da iya da yawa don taimaka aiki ta hanyar jikin tashar dukkana.
• Tsari Don Commutation (Tcom): Tsari daga lokacin da current a fasahin mafi yawa ya faru har zuwa lokacin da ya buƙata.
• Tsari Don Buƙata (Tclr): Tsari daga Tf zuwa lokacin da current ya buƙata, ko kuma ya faru da Iknee.
• Tsari Don Aiki Ta Hanyar Da Shuka Iya (Tlim): Tsari daga lokacin da jikin tashar dukkana ya faru har zuwa lokacin da ya faru aiki ta hanyar da shuka iya ta hanyar jikin tashar dukkana.

Gajarta

Proactive Hybrid Circuit Breaker (PHCB) HVDC, wanda ABB ta design, yana amfani da mechanical and semiconductor switches don taimaka aiki ta hanyar da shuka iya, reliable, and efficient fault protection for HVDC systems. The definitions and time frames for hybrid HVDC circuit breakers highlight the unique challenges and requirements of DC protection, emphasizing the need for rapid and precise operation to ensure system safety and stability.