Reverse power protection method and distributed power generation system

A technology of reverse power protection and distributed power generation, applied in the field of power system, can solve the problems of low utilization rate of distributed energy and high system cost, and achieve the effect of reducing system cost and improving utilization rate

Active Publication Date: 2013-01-09
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a reverse power protection method and a distributed power generation system ...

Method used

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  • Reverse power protection method and distributed power generation system
  • Reverse power protection method and distributed power generation system
  • Reverse power protection method and distributed power generation system

Examples

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Embodiment 1

[0048] image 3 For the flow chart of the reverse power protection method disclosed in the embodiment of the present invention, see image 3 As shown, the reverse power protection method may include:

[0049] Step 301: The monitoring computer receives the reverse power value detected by the two-way energy metering device flowing from the public connection point to the public grid.

[0050] The two-way energy metering device is located between the public connection point and the public grid, can detect the current and voltage on the connection line between the public connection point and the public grid, and can measure but not limited to apparent power, active power, Electrical parameters such as reactive power and electric energy; in the embodiment of the present invention, since the problem to be solved is the reverse power problem, the two-way energy metering device is used to obtain the reverse power value flowing from the public connection point to the public grid.

[0...

Embodiment 2

[0067] Image 6 For the flow chart of another reverse power protection method disclosed in the embodiment of the present invention, see Image 6 As shown, the method may include:

[0068] Step 601: The monitoring computer receives the reverse power value detected by the two-way energy metering device flowing from the public connection point to the public grid.

[0069] Step 602: Determine whether the reverse power value is greater than a preset reverse power standard value; if yes, go to step 603; if not, go to step 604.

[0070] Step 603: Send an instruction to reduce the output power to the generator set.

[0071] Step 604: Determine whether there is forward power flowing from the utility grid to the public connection point; if yes, go to step 605.

[0072] If there is positive power flowing from the public grid to the public connection point, it proves that the output power of the generator set cannot meet the consumption requirements of the local load, and the generator...

Embodiment 3

[0077] Figure 7 For a schematic structural diagram of a distributed power generation system disclosed in an embodiment of the present invention, see Figure 7 As shown, the distributed generation system 70 may include:

[0078] The bidirectional energy metering device 701 is used to detect the reverse power value flowing from the public connection point to the public grid.

[0079] The monitoring computer 702 is used to receive the reverse power value detected by the two-way energy metering device, and judge whether the reverse power value is greater than the preset reverse power standard value; Instructions to reduce output power.

[0080] The generator set 703 is configured to receive an instruction to reduce the output power sent by the monitoring computer, and reduce the output power according to the instruction to reduce the output power.

[0081] A schematic structure of the monitoring computer 702 can be found in Figure 8 , Figure 8 for Figure 7 In the shown e...

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Abstract

The invention discloses a reverse power protection method and a distributed power generation system. According to the method, an original bi-directional energy metering module and an original monitoring computer in the distributed power generation system in the prior art are utilized; the monitoring computer receives a reverse power value which flows from a common connection point to a utility grid and is detected by a bi-directional energy metering device firstly, and then judges whether the reverse power value is greater than a predetermined reverse power standard value; and if the reverse power value is greater than a predetermined reverse power standard value, the monitoring computer transmits a command of reducing output power to a generating set so as to reduce the output power of the generating set. By the reverse power protection method and the distributed power generation system disclosed by the embodiment of the invention, the original devices of the system are utilized, and a reverse power protection device does not need to be configured specially, so that the system cost is reduced. Meanwhile, when reverse power appears, the reverse power protection is realized on the promise of not disconnecting any generating set, and the utilization rate of distributed energy resources is improved.

Description

technical field [0001] The invention relates to the field of electric power systems, and more specifically, relates to a reverse power protection method and a distributed power generation system. Background technique [0002] With the development of the times, society's demand for energy is increasing. Therefore, the development and utilization of renewable resources such as wind energy, solar energy, and biomass energy have received strong support from relevant departments. However, due to the intermittent, fluctuating and periodic nature of some renewable energy sources such as wind energy and solar energy, the power generated by them is unstable and uncontrollable. Therefore, some countries, including China, stipulate that renewable energy power generation systems, which often exist in the form of distributed power generation systems, need to generate electricity nearby on the load side, and do not allow direct transmission of electric energy to the public grid, that is, ...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56Y02P80/20
Inventor 李建泉吴小云管仁德
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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