Distributed direct current micro-grid control method and control system

A technology of DC micro-grid and control method, which is applied in the direction of parallel operation of DC power supplies, and can solve the problems of unsuitable application occasions where power station construction is inconvenient, and achieve the effects of convenient local control, high traffic speed, and high stability

Inactive Publication Date: 2016-06-15
SICHUAN HANGDIAN MICRO ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the DC microgrid control method mostly adopts the centralized control method, which requires the equipment construction of the microgrid to be relati

Method used

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  • Distributed direct current micro-grid control method and control system

Examples

Experimental program
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Effect test

Example Embodiment

Specific Example 1

[0031] A distributed DC microgrid control method. The specific control method is: setting the output level voltage of each of the n electric energy input modules that can input electric energy to the DC bus; comparing the output level voltage of each electric energy input module with the current DC bus The voltage value is compared. If the current DC bus voltage is lower than the output level voltage of a certain energy input module, the energy input module will input energy to the DC bus with the maximum power it can output; if the current DC bus voltage is higher than The output level voltage of a certain electric energy input module is prohibited from inputting electric energy to the DC bus; if the current DC bus voltage value is equal to the output level voltage of a certain electric energy input module, the output power of the electric energy input module is controlled to make it Ensure that the voltage on the current DC bus is constant; the n is a natur...

Example Embodiment

Specific Example 2

[0037] On the basis of specific embodiment 1, the output level voltage is the output level voltage range including the error range; the output level voltage range of each electric energy input module is compared with the voltage value of the current DC bus, if the current DC bus If the voltage value is lower than the lower limit of the output level voltage error of a certain power input module, the power input module inputs power to the DC bus with the maximum power it can output; if the current DC bus voltage value is higher than the output level voltage of a certain power input module If the upper limit of the error is reached, the power input module is prohibited from inputting power to the DC bus; if the current DC bus voltage is within the voltage error range of the output level of a certain power input module, the output power of the power input module is controlled to ensure the current DC The voltage on the bus is constant; the n is a natural number g...

Example Embodiment

Specific Example 3

[0038] On the basis of specific embodiment 1 or 2, the output grade voltage division principle includes: the output grade voltage of the renewable energy electric energy input module is higher than the output grade voltage of the non-renewable energy electric energy input module; The output level voltage is higher than the output level voltage of the energy storage access power input module.

[0039] For example: the current power input modules include solar power input modules, wind power input modules, grid power input modules, and battery power input modules; then the solar power input modules and wind power input modules correspond to An output level voltage a (such as 620V), the grid connected to the power input module corresponds to an output level voltage b (such as 610V), and the battery connected to the power input module corresponds to an output level voltage c (such as 600V), and a> b> c, 4 electric energy input modules correspond to 3 output grade v...

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Abstract

The invention provides a distributed DC microgrid control method and a control system. Set the output level voltage of the power input module that can input power to the DC bus; compare the output level voltage with the voltage value on the current DC bus, if the current DC bus voltage value is lower than the output level voltage of a certain power input module, then the The power input module inputs power to the DC bus with the maximum power it can output; if the current voltage value is higher than the output level voltage of a certain power input module, the power input module is prohibited from inputting power to the DC bus; if the current voltage value is equal to a certain power The output level voltage of the input module is used to control the output power of the electric energy input module so as to ensure the constant voltage on the current DC bus. According to the divided output level voltage, the electric energy is preferentially utilized in a differentiated manner, which is convenient for local control, and is especially suitable for distributed DC micro-grid control in some applications where power station construction is inconvenient.

Description

technical field [0001] The invention relates to a control method and a control system of a DC micro-grid, in particular to a control method and a control system of a distributed DC micro-grid applicable to the field of electric power supply. Background technique [0002] The DC microgrid connects various power supply equipment (photovoltaic, wind power, energy storage, public grid, etc.) into a system in the form of a DC bus. Users only need to add one kind of electrical equipment to conveniently use the power of the microgrid. [0003] Independent microgrid systems with DC bus, such as figure 1 As shown, it includes the power generation and supply link connected to the DC bus (including various power generation equipment (such as power generation equipment or power grid) and energy storage equipment (such as storage batteries)), and also includes the power supply module and load respectively connected to the DC bus . The power generation and supply link generates power an...

Claims

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Application Information

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IPC IPC(8): H02J1/10
CPCH02J1/10
Inventor 郑尧刘尚勇杨西全王征韩鹤光
Owner SICHUAN HANGDIAN MICRO ENERGY CO LTD
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