Method and apparatus for multi-source electrical energy grid-tied transformation

• US 20110018353A1
• Filed: 07/23/2009
• Published: 01/27/2011
• Est. Priority Date: 07/23/2009
• Status: Abandoned Application

• Current Assignee: Wenjiang Yu
• Original Assignee: Wenjiang Yu
• Inventors: Yu, Wenjiang
• Application Number:
  US12/508,546
• Publication Number:
  US 20110018353A1
• Time in Patent Office: Days
• US Class Current: 307/82
• CPC Class Codes: H02J 1/10 Parallel operation of dc sources
• CPC Class Codes: H02J 2300/24 of photovoltaic origin
• CPC Class Codes: H02J 2300/26 involving maximum power point tracking control for photovoltaic sources maximum power point systems in particular G05F1/67
• CPC Class Codes: H02J 2300/28 The renewable source being wind energy wind motors F03D
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 5/00 Circuit arrangements for transfer of electric power between ac networks and dc networks H02J3/36 takes precedence
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers
• CPC Class Codes: Y02P 80/10 Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Abstract

A method and apparatuses transform the electrical energy from multiple sources to grid compliant AC voltage. The apparatus according to one embodiment comprises: multiple energy sources (GES 1 to m in FIG. 1) from various power conversion devices; controllers (GER 1 to m in FIG. 1) pumping the maximum available electrical power to the DC inter-source bus; a hybrid inter-source DC bus carrying the electrical power from controllers to inverters and load level information among inverters; and inverters (CNT 1 to k) converting the DC power from the inter-source DC bus to grid compliant AC power.

Claims

1. ) Inter-source hybrid bus structure system to convert the electrical energy from multiple sources to grid compliant AC voltage.

2. ) The system in claim 1 further includes multiple controllers that pump their own sources energy to inter-source bus.

3. ) The controllers of claim 2 have no voltage output regulation function.

4. ) The controllers of claim 3 pump the maximum available power from its source to the DC bus.

5. ) The controllers of claim 4 can disable its own boosting circuit in the case of inter-source voltage higher than desired level.

6. ) The system in claim 1 further includes inverters that convert inter-source bus DC voltage to grid compliant AC voltage.

7. ) The inverters in claim 6 output available power based on maintaining inter-source bus voltage at a desired level.

8. ) The inverters in claim 7 will limit their output power level to a pre-set maximum level in the case of combined inter-source capacity higher than desired level.

9. ) The inverters in claim 7 will communicate to each other about their own output level relative to individual capacities through the inter-source bus DC with a heart beat signal.

10. ) The inverters in claim 9 will coordinate the output level of each inverter to maintain maximum output efficiency based on a pre-set profile.