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Optimal operation method of distributed wind farm based on variable power factor

An optimized operation, decentralized technology, applied in wind power generation, reduction/prevention of power oscillation, AC network with the same frequency from different sources, etc., can solve the problem that the influence of DWF grid-connected voltage stability cannot be ignored, etc.

Inactive Publication Date: 2021-01-22
BEIJING JIAOTONG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing technology, people mainly focus on the optimization method of typical parameters of the distribution network under the condition of a single constant load type, but the DWF is connected to the grid near the terminal load, and the influence of different load types on the DWF grid-connected voltage stability cannot be ignored

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  • Optimal operation method of distributed wind farm based on variable power factor
  • Optimal operation method of distributed wind farm based on variable power factor
  • Optimal operation method of distributed wind farm based on variable power factor

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Embodiment 1

[0127] The embodiment of the present invention provides a distributed wind farm optimization operation method based on variable power factor, establishes a static voltage load model of the distribution network considering different load types, and adopts an improved firefly algorithm to solve the dynamic adjustment of the optimal power factor. The objective function is to reduce voltage deviation and reduce active and reactive network losses.

[0128] A schematic flow chart of a variable power factor-based distributed wind farm optimal operation method provided by an embodiment of the present invention is as follows figure 1 As shown, the specific steps of the method are as follows:

[0129] S110: Construct a general load model based on static voltage characteristics for the distribution network of the grid-connected point where the distributed wind farm is connected.

[0130] Conventional distributed wind farms are connected to the distribution network through POI (point of ...

Embodiment 2

[0224] This embodiment provides an algorithm verification for a variable power factor-based distributed wind farm optimal operation method, as follows:

[0225] The IEEE-33 node distribution network architecture is used for verification. Among them, the IEEE-33 node system with 3 access points has 32 branches, 5 tie switch branches, and 1 power network, and the reference voltage at the head end is 12.66 kV. The active power and reactive power of the connected load are 3.72MW and 2.30Mvar respectively. Considering 4 single load types (RL, IL, CL, CPL) and mixed load types, in ML, let IL, RL, CL account for 40%, 45% and 15% respectively.

[0226] In the simulation, it is assumed that mixed loads are used to replace the access of traditional constant loads at each node, and the access capacity is consistent with that of traditional loads. The topology of decentralized wind farm access based on DFIG is as follows: Figure 6 As shown, the IEEE-33 node system is accessed through ...

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Abstract

The embodiment of the invention provides an optimization operation method of dispersed wind farms based on variable power factors. The method comprises the steps of: constructing a general load modelbased on static voltage features for a power distribution network of points of interconnection connected with the dispersed wind farms; arranging capacitors at the points of interconnection to balancereactive power regulation capabilities of the stator side and a convertor of the network set of the doubly-fed induction generator, and obtaining the power factor angle, as shown in the description,of the doubly-fed induction generator according to the general load model; according to the power factor angle as shown in the description, constructing an active power loss model and a reactive powerloss model of the dispersed wind farms after the dispersed wind farms are accessed into the points of interconnection, and analyzing the node voltage deviation influence factors after the dispersed wind farms are accessed into the points of interconnection; constructing a multi-target function of dynamic control of the power factors of the dispersed wind farms to meet the requirements that the node voltage deviations, the active power loss model and the reactive power loss model as the optimal values; and solving the multi-target function by employing the improved firefly algorithm. The optimization operation method of dispersed wind farms based on variable power factors effectively improves the operation time and the convergence rate, and improves the system performances.

Description

technical field [0001] The invention relates to the technical field of distributed wind power grid connection, in particular to a variable power factor-based distributed wind farm optimization operation method. Background technique [0002] In recent years, wind power technology is being adjusted from centralized development to centralized development and decentralized utilization. DWF (dispersed wind farms) will play an increasingly important role in the future grid. However, as a high proportion of DWF is integrated into the distribution network, its high penetration rate and bidirectional power flow will have a greater impact on the planning and operation of the power grid. [0003] In the traditional distribution network, DWF adopts a "connect and forget" installation policy, that is, DWF is only used as a supplement to the large power grid. In this context, DWF usually operates at the maximum power point with unity power factor, so it is equivalent to a passive "negat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/48H02J3/50H02J3/06H02J3/24
CPCY02E10/76
Inventor 刘昊王玮唐芬张放
Owner BEIJING JIAOTONG UNIV
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