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Distributed power generation unit cooperative control method and system

A technology of distributed power generation and collaborative control, which is applied in the direction of AC network voltage adjustment, single-network parallel feeding arrangement, reactive power compensation, etc., and can solve the problems of inability to accurately observe the average voltage of distributed power sources, etc.

Active Publication Date: 2020-02-11
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide a distributed power generation unit cooperative control method and system, aiming at solving the problem that the existing secondary control of distributed power mainly relies on the voltage observer, but the voltage observer is affected by the input The influence of the disturbance makes it impossible to accurately observe the average voltage of the distributed power supply

Method used

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  • Distributed power generation unit cooperative control method and system
  • Distributed power generation unit cooperative control method and system
  • Distributed power generation unit cooperative control method and system

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Embodiment

[0135] In this embodiment, the DC microgrid system composed of 4 DG units is taken as an example. The structure diagram of the microgrid system is as follows: figure 1 As shown, there is line impedance between each DG unit. The control target of the microgrid system is that the average bus voltage of each DG unit node reaches the rated value of 230V, and the frequency of the microgrid system is stable at the rated value of 50Hz. At the same time, each DG unit’s The output power is allocated in proportion to their respective capacities. The capacity of the first distributed generation unit and the third distributed generation unit set in this embodiment is twice that of the second distributed generation unit and the fourth distributed generation unit. A ring communication topology is adopted between the distributed generation unit nodes, that is, the first distributed generation unit can receive the state information of the fourth distributed generation unit and the second dist...

Embodiment 2

[0156] Figure 6 shows the control effect of the voltage control function when the voltage controller has an initial value, where Figure 6(a) is the bus voltage amplitude of the DGs node; Figure 6(b) is the voltage control signal; Figure 6(c) is the reactive power output by DGs. Before t=1s, the microgrid system works in the droop control mode, and t=1s is put into the coordinated control method of distributed generation units, and the voltage control signal u of the voltage controller vi It has an initial value of 5V before the secondary control is put into use. After the secondary control is put into use, it can be seen from Figure 6(c) that the reactive power quickly tends to the same value. It can be seen from Figure 6(b) that u vi It can still converge to a reasonable steady-state value. As shown in Figure 6(a), it can be seen that the average value of the bus voltage of each node of the microgrid is restored to 230V, which illustrates the distributed control method based ...

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Abstract

The invention discloses a distributed power generation unit cooperative control method and system, and belongs to the technical field of electrical engineering. The method comprises the following steps: establishing a frequency control function to adjust the frequency control signal according to the frequency deviation of the distributed power generation unit, the difference between the frequencycontrol signal exchanged between the distributed power generation unit and adjacent nodes and the difference between the intermediate variables controlled by the frequency; establishing a voltage control function to adjust the voltage control signal according to the voltage deviation of the distributed power generation unit, the difference between the reactive power exchanged between the distributed power generation unit and the adjacent nodes and the product of the reactive power droop coefficient and the difference between the intermediate variables of voltage control; and using the voltagecontrol signal to compensate the bus voltage at the port of the distributed power generation unit and using the frequency control signal to compensate the frequency reference value of the distributedpower generation unit. The method and the system avoid the influence of the calculation error of the voltage observer on the control effect.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and more specifically relates to a method and system for coordinated control of distributed power generation units. Background technique [0002] In recent years, with the continuous increase of the penetration rate of new energy power generation in the power grid, the microgrid as a control unit integrating multiple distributed generation (distributed generation, DG) and loads has received more and more attention. The droop control is adopted for multiple DG units running in parallel, which can realize the frequency and voltage stability of the microgrid, and at the same time realize the distribution of active power and reactive power of DGs in inverse proportion to the set droop coefficient, but when there is line impedance in the system , the accuracy of reactive power distribution will be affected. At the same time, droop control will inevitably introduce frequency deviation an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/48H02J3/50H02J3/16
CPCH02J3/16H02J3/48H02J3/50Y02E40/30
Inventor 陈霞石梦璇周建宇闫林芳文劲宇
Owner HUAZHONG UNIV OF SCI & TECH