Solving method for calculating operational domain of distributed power supply and microgrid in power distribution network

A technology of distributed power supply and distribution network, applied in the field of distribution network, can solve problems such as lack of research in the security domain, and achieve the effect of convenient regulation

Active Publication Date: 2017-05-31
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is still a lack of research on the security domain after a large number of DGs are connected to the distribution network

Method used

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  • Solving method for calculating operational domain of distributed power supply and microgrid in power distribution network
  • Solving method for calculating operational domain of distributed power supply and microgrid in power distribution network
  • Solving method for calculating operational domain of distributed power supply and microgrid in power distribution network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The embodiment of the present invention proposes the concept of operation domain, obtains the operation domain of DG and microgrid in the distribution network, and provides theoretical guidance for the safe and efficient operation of the high-penetration renewable energy distribution system, see figure 1 , the method includes the following steps:

[0046] 101: Respectively obtain the definitions of the distribution network operating point, operating domain, and operating boundary, and obtain the mathematical model of the operating domain;

[0047] 102: Obtain DG output constraints and operating domain boundaries, system power flow equation constraints and operating domain boundaries, voltage offset constraints and voltage boundaries, reverse power flow constraints and reverse power flow boundaries, feeder capacity constraints and feeder capacity boundaries;

[0048] 103: According to the calculation results in step 101 and step 102, obtain the operation domains of distr...

Embodiment 2

[0051] The following is combined with specific calculation formulas, examples, Figure 2-Figure 4 The scheme in embodiment 1 is introduced in detail, see the following description for details:

[0052] 201: Definition and mathematical model of distribution network operation domain;

[0053] (1) Definition of working point

[0054] A certain operating state of the distribution network is referred to as the operating point, that is, the power and voltage data and operating mode of all node branches in a certain transient state.

[0055] (2) Definition of operating domain and mathematical model

[0056]Definition of Distribution Network Operation Domain (DSDR): It is a collection of operating points that make all nodes meet the safe operation constraints during operation.

[0057] If the operating point satisfies the operational constraints, it is called operationally safe or N-0 safe, otherwise it is called unsafe. The operation domain gives the maximum utilization range of ...

Embodiment 3

[0096] The feasibility of the schemes in Examples 1 and 2 will be verified below in combination with basic calculation examples, see the description below for details:

[0097] 1. Basic situation of the calculation example

[0098] The grid structure of the example power grid is as follows: Figure 5 As shown, the IEEE33 system is used for verification. There are 32 branches in the network, 1 power network, the reference voltage of the head end is 12.66kV, and the reference value of power is 10MVA. The rated capacity of the feeder is 5.28MW, and the node voltage does not exceed ±5% of the rated voltage, with the output power as the positive direction. Connect PQ-type MG at node 15, PV-type MG at node 21, PQ-type DG at node 24, and PV-type DG at node 30.

[0099] In order to study the graph in two-dimensional space, a two-dimensional cross-section is taken, and the output of the other nodes is determined to remain unchanged except for the two studied nodes. The DG and microgr...

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Abstract

The invention discloses a solving method for calculating an operational domain of a distributed power supply and microgrid in a power distribution network. The method comprises the steps of obtaining the working site and the operational domain of the power distribution network and the definition of an operation boundary respectively, and obtaining a mathematical model of the operational domain; obtaining DG force exerting constraint and operational domain boundary, system power flow equality constraint and the operational domain boundary, voltage excursion constraint and voltage boundary, reverse power flow constraint and reverse power flow boundary, and feeder line capacity constraint and feeder line capacity boundary; obtaining the operational domain of the distributed power supply and the microgrid in a given power distribution network according to a calculating result. According to the solving method for calculating the operational domain of the distributed power supply and the microgrid in the power distribution network, N-1 simulation is not needed, the working state of each working point in the system obtained through power flow calculation, and whether the working site is at a safe operation state or not is judged; in the power flow calculation, node voltage and trend loss are taken into consideration, and an accurate result is obtained; the force exerting ranges of each DG and microgrid in the power distribution network are given, which makes it convenient for scheduling personnel to conduct adjusting and controlling on a power grid, and thus the method has the advantages of being quick, accurate and practical.

Description

technical field [0001] The invention relates to the field of distribution networks, in particular to a method for calculating the operating domains of distributed power sources and microgrids in distribution networks. Background technique [0002] In recent years, distributed generation (DG) is being connected to the distribution network in large quantities due to its advantages of high efficiency and environmental protection. [1] . However, due to the access of DG, the distribution network has changed from the original single power distribution role to a new power exchange system integrating power collection, transmission, storage and distribution, which will inevitably cause a series of problems in the following aspects: power system Load forecasting, system planning, system power flow, grid dispatching, grid stability, protection devices, etc. Among them, the problems of reverse flow, overcurrent and node voltage limit are the most prominent [2] . [0003] At present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06Q50/06
CPCG06F30/18G06F30/367G06Q50/06Y02E60/00
Inventor 肖峻王博张泽群祖国强
Owner TIANJIN UNIV
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