Distributed generation parallel operation droop control method

A technology of distributed power supply and control method, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of different line impedances and different rated powers, and reduce the fluctuation of AC bus voltage amplitude and frequency, Realize the effect of no-difference adjustment and improve dynamic response speed

Inactive Publication Date: 2018-06-05
赵志刚
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Problems solved by technology

When the rated power of the DGs is the same and the system line parameters are the same, the DGs running in parallel can use the same droop gain, but there are many different DGs in the microgrid, and their positions are scattered, so that the lines connected to the microgrid The impedance is also different, and the power rating of each DG is also different

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  • Distributed generation parallel operation droop control method
  • Distributed generation parallel operation droop control method
  • Distributed generation parallel operation droop control method

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Embodiment Construction

[0015] specific implementation plan

[0016] Such as figure 1 , figure 2 As shown, at the initial moment of adjustment, Q01=Q02=0. Subsequently, the existence of Q1 and Q2 makes the values ​​of ΔU1 and ΔU2 larger, and under the action of the ΔUx recovery mechanism, Q01 and Q02 will reach a larger value; at the same time, the change of voltage will in turn affect the larger value of the output power of the power supply Q1 and Q2. Change, and then achieve a new stability under the mediation of the combination of Q-ΔU droop control and ΔU recovery mechanism, so that the output reactive power is stable at Q01 and Q02 respectively. Finally Q01=Q1, Q02=Q2. The entire improved droop control process includes three parts: power calculation, droop regulation, and voltage synthesis. The decoupling voltage obtained by the voltage synthesis part will be used as the command voltage for voltage control.

[0017] Such as image 3 As shown, the entire improved droop control process inclu...

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Abstract

The invention discloses a distributed generation (DG) parallel operation droop control method, which comprises three parts including application of a parallel operation system, voltage-current doubleloop control and droop adjustment. The distributed generation parallel operation droop control method proposed by the invention can effectively reduce fluctuations of voltage amplitude and frequency of an AC bus caused by power droop adjustment by inverters in a micro grid, and can effectively suppress the reactive power circular current in an inverter parallel system. The voltage-current double loop control realizes no-deviating regulation and improves the dynamic response speed of the system. Meanwhile, the active power can be evenly distributed in proportion to capacities of the DGs.

Description

technical field [0001] The invention relates to a distributed power supply, in particular to a droop control method for parallel operation of distributed power supplies. Background technique [0002] Microgrid is a small-scale decentralized independent system, which uses modern power technology to combine gas turbines, wind power, photovoltaic power generation, fuel cells, energy storage equipment, etc., and directly connects to the user side. For the large power grid, the microgrid can be regarded as a controllable unit in the grid, which can act within seconds to meet the needs of the external transmission and distribution network; for users, the microgrid can meet their specific needs, The microgrid and the large grid exchange energy through the point of common coupling (PCC), and the two sides serve as backups for each other, thereby improving the reliability of power supply. In addition to the functions of conventional inverters and the ability to operate in parallel, ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/24H02J3/12
CPCH02J3/381H02J3/12H02J3/24
Inventor 赵志刚
Owner 赵志刚
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