Miniature intelligent power station circuit topological structure and energy management strategy thereof

A topology and energy management technology, applied in battery circuit devices, circuit devices, AC network circuits, etc., can solve problems such as increased power loss, increased manufacturing costs, stability of distributed port smart transformers, and economic threats

Active Publication Date: 2020-08-28
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sudden changes in port power and poor local power mobility will pose a great threat to the stability and economy of distributed port smart transformers, which is unacceptable for distributed energy smart transformers
Usually, the distributed low-voltage ports are realized through the parallel connection of the DC output terminals of each power unit. If you want to connect distributed energy sources, you will inevitably be limited by the voltage level, which leads to the need to add subsequent power conversion links, thereby increasing power loss and causing Reduced power transmission efficiency and increased manufacturing costs have a greater impact on the economics of distributed energy interconnection / grid-connection

Method used

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  • Miniature intelligent power station circuit topological structure and energy management strategy thereof
  • Miniature intelligent power station circuit topological structure and energy management strategy thereof
  • Miniature intelligent power station circuit topological structure and energy management strategy thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0062] The load power decreases or increases, resulting in the redistribution of the power of each port of the hybrid power unit; when the maximum power generated by the solar photovoltaic panel P pv_m For its rated value, take a hybrid power unit as an example to illustrate the impact of load power reduction or increase on its power distribution at each port.

[0063] Such as Figure 7 As shown, when the load power P ld is 0, the operating point of the hybrid power unit on the DC power-voltage curve is at A 1 point, the operating point of the AC power-voltage curve is located at A 2 point, the active power output to the high-voltage AC grid is P ac1 , the charging power of the battery is P ch , the photovoltaic power generation is Ppv-1 , the relationship between port power satisfies: P pv-1 =P ch +P ac1 ;

[0064] When the load power increases to P ld-2 , the operating point of the hybrid power unit on the DC power-voltage curve starts from A 1 The point moves alo...

Embodiment 2

[0071] The decrease or increase of the load power leads to the redistribution of the power of each port of the hybrid power unit; affected by the actual operating environment, the maximum power of photovoltaic power generation may be less than the rated value. For this situation, a hybrid power unit is used as an example below Describe the impact of load power reduction or increase on the power distribution of each port.

[0072] Such as Figure 8 As shown, when the load power is 0, the operating point of the hybrid power unit on the DC power-voltage curve is at A 1 point, the operating point of the AC power-voltage curve is located at A 2 point, the active power output to the high-voltage AC grid is P ac1 , the charging power of the battery is P ch , the photovoltaic power generation power is P pv-1 , the relationship between port power satisfies: P pv-1 =P ch +P ac1 ;

[0073] When the load power increases to P ld-2 , the operating point of the hybrid power unit on ...

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Abstract

The invention discloses a miniature intelligent power station circuit topological structure and an energy management strategy thereof. The miniature intelligent power station circuit topological structure comprises three phases a, b and c which are identical in structure, wherein each phase comprises N hybrid power units and a direct-current bus a8, the N hybrid power units are connected in sequence, one alternating current output end of each phase of hybrid power unit is connected to a point O, the direct-current output end of each hybrid power unit is connected with the direct-current bus a8, one alternating-current output end of the nth hybrid power unit of each phase is connected with the other alternating-current output end of the (n-1)th hybrid power unit, and the alternating-currentvoltage output end of the hybrid power unit of each phase is connected with a high-voltage alternating-current power grid a9. According to the energy management strategy, smooth switching of the grid-connected / off-grid operation mode is achieved according to the real-time requirements of the load and the power grid.

Description

technical field [0001] The invention belongs to the field of distributed integrated power supply control, and specifically relates to a circuit topology structure of a miniature intelligent power station and an energy management strategy thereof. Background technique [0002] A distributed integrated energy system is an energy system that effectively and reliably connects power generation, energy storage, and power consumption through a specific topology network and terminal power equipment. With the introduction of the concept of global energy Internet, distributed integrated energy systems of various types, forms, and scales are developing rapidly. However, the power routing performance of distributed port smart transformers largely depends on the degree of port power decoupling and power path flexibility. Sudden changes in port power and poor local power mobility will pose a great threat to the stability and economy of distributed port smart transformers, which is unacce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/32H02J3/46H02J3/48H02J7/35H02J1/10H02J4/00
CPCH02J1/10H02J3/32H02J3/381H02J3/48H02J4/00H02J7/35H02J3/466H02J2300/24H02J2300/26Y02E10/56
Inventor 汪诚彭合李磊
Owner NANJING UNIV OF SCI & TECH
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