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Load current calculating method and apparatus, and bidirectional inverter

A bidirectional inverter, load current technology, applied in the field of electric power exchange, can solve problems such as cost increase

Inactive Publication Date: 2018-07-20
SHENZHEN POWEROAK NEWENER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention aims to provide a load current calculation method, device and bidirectional inverter, which solves the technical problem in the prior art that a current sensor needs to be added for load current detection, resulting in an increase in cost

Method used

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  • Load current calculating method and apparatus, and bidirectional inverter
  • Load current calculating method and apparatus, and bidirectional inverter
  • Load current calculating method and apparatus, and bidirectional inverter

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Experimental program
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Embodiment 1

[0052] see figure 1 , figure 1 is a schematic flowchart of a load current calculation method provided by an embodiment of the present invention. Such as figure 1 As shown, the method is applied to a bidirectional inverter, such as a bidirectional grid-connected inverter, the bidirectional inverter is connected to the grid and the load, and the bidirectional inverter includes: a first current transformer and a second current transformer transformer, the method comprising:

[0053] Step S10: detecting the instantaneous value of the inverter current through the first current transformer, and detecting the instantaneous value of the grid current through the second current transformer;

[0054] Wherein, the load is located between the bidirectional inverter and the power grid, the bidirectional inverter is connected to an energy storage battery, and the energy storage battery may be a combination of multiple batteries, that is, an energy storage battery pack, or battery pack, t...

Embodiment 2

[0072] see Figure 5 , Figure 5 It is a schematic diagram of a load current calculation device provided by an embodiment of the present invention. The load current calculation device 100 can be applied to a bidirectional inverter connected to a power grid and a load. The bidirectional inverter includes: a first current transformer as well as a second current transformer such as Figure 5 As shown, the load current calculation device 100 includes:

[0073] The instantaneous current value detection unit 10, the instantaneous current value detection unit 10 is used to detect the instantaneous value of the inverter current through the first current transformer and detect the instantaneous value of the grid current through the second current transformer;

[0074] The load current instantaneous value calculation unit 20, the load current calculation unit 20 is used to calculate the load current instantaneous value according to the inverter current instantaneous value and the grid...

Embodiment 3

[0082] Please also refer to Figure 6 to Figure 8 , Figure 6 It is a circuit topology diagram provided by the embodiment of the present invention; Figure 7 is a topology diagram of a bidirectional inverter provided by an embodiment of the present invention; Figure 8 It is a structural schematic diagram of a bidirectional inverter provided by an embodiment of the present invention.

[0083] Wherein, the bidirectional inverter may be a bidirectional grid-connected inverter, a string type bidirectional inverter, and so on.

[0084] Such as Figure 6 As shown, the bidirectional inverter 500 is connected to the energy storage battery 200, and the bidirectional inverter 500 is also respectively connected to the power grid 300 and the load 400, and the first current transformer 53 is arranged on the bidirectional inverter 500, The second current transformer 54 is also arranged in the bidirectional inverter 500, the second current transformer 54 is connected to the power grid 3...

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Abstract

The embodiments of the invention relate to the electric power AC field, and disclose a load current calculating method and apparatus, and a bidirectional inverter. The load current calculating methodis applied to the bidirectional inverter. The bidirectional inverter is connected with a power grid and a load. The bidirectional inverter includes a first current transformer and a second current transformer. The load current calculating method includes the steps: detecting an inversion current instantaneous value through the first current transformer, and detecting a power grid current instantaneous value through the second current transformer; according to the inversion current instantaneous value and the power grid current instantaneous value, calculating a load current instantaneous value; and according to the load current instantaneous value, calculating a load current effective value. Through the above mode, the load current calculating method solves the technical problem that in the prior art, detection of load current needs to increase a current sensor, thus increasing the cost.

Description

technical field [0001] The invention relates to the field of electric power exchange, in particular to a load current calculation method, device and bidirectional inverter. Background technique [0002] Bidirectional inverters, also known as inverter rectifiers and battery inverters, are widely used in new energy storage systems, new energy charging stations, and new energy power systems. The role of the bidirectional inverter is to connect the AC system and the DC system to realize energy conversion between the two systems, that is, sometimes it needs to be converted from DC to AC, and sometimes it needs to be converted from AC to DC. [0003] With the rise of energy storage and bidirectional inverter technology, the detection accuracy and cost requirements for each device are getting higher and higher. Due to the detection accuracy requirements, many sensors are added to the inverter equipment, resulting in a significant increase in cost. Conducive to saving costs. [00...

Claims

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Application Information

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IPC IPC(8): H02J3/48H02J3/32H02J3/38
CPCH02J3/32H02J3/38H02J3/383H02J3/48Y02E10/56
Inventor 尹相柱刘志亮马辉陈铭秦赓甘超龙马昌峰李宇宗
Owner SHENZHEN POWEROAK NEWENER