Micro-grid power safety and economic dispatching method and system

A technology of economic scheduling and micro-grid, applied in the direction of single-network parallel feeding arrangement, electrical components, circuit devices, etc., can solve the problems of lack of micro-grid power optimal scheduling, immaturity, etc.

Pending Publication Date: 2019-05-21
CHINA ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the security control technology of microgrid is still immature, and there is a lack of relevant research on the optimal scheduling of microgrid power while taking into account the safe operation.

Method used

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  • Micro-grid power safety and economic dispatching method and system
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  • Micro-grid power safety and economic dispatching method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] An embodiment of the present invention provides a method for safe and economic dispatch of electric energy in a microgrid, the specific implementation process of which is as follows figure 1 shown, including:

[0108] S101: Bring the operation data of adjustable resources in the microgrid into the pre-established microgrid operation model, and obtain the adjustable The active output reference value of resources within the set time scale;

[0109] S102: Based on the active output reference value, the pre-collected renewable energy forecast data and load forecast data, perform power flow calculation on the microgrid to obtain the initial voltage value of each node, and according to the node voltage The initial value determines the node where the voltage exceeds the limit;

[0110] S103: For the node where the voltage exceeds the limit, correct the active output range of the adjustable resource through the preset voltage control strategy, and feed back the corrected acti...

Embodiment 2

[0149] In the embodiment of the present invention, the IEEE 33 node power distribution system is used to simulate the structure of the microgrid, as shown in Figure 5. Among them, two micro gas turbines are connected to nodes 2 and 8, with rated capacities of 80 kW and 55 kW respectively; one fuel cell is connected to node 24, with a rated capacity of 60 kW; wind turbines and photovoltaics are connected to nodes 27 , 30, with a rated capacity of 30kW; the access location of the energy storage is node 16, with a rated capacity of 200kWh; two electric vehicles are respectively connected to nodes 20 and 32, with a battery capacity of 32kWh and a rated charging power of 7kW. Below, the simulation results of the embodiment of the present invention are described:

[0150] Depend on Image 6 It can be seen that after using the method provided by the present invention for microgrid power scheduling, the voltage amplitude of the system nodes has been greatly improved, and the average ...

Embodiment 3

[0152] Based on the same inventive concept, the present invention also provides a microgrid electric energy safety and economic dispatch system, the system structure diagram is as follows Figure 7 As shown, the system includes:

[0153] The system includes:

[0154] The scheduling module is used to bring the adjustable resource operation data, renewable energy forecast data and load forecast data in the microgrid into the pre-established microgrid operation model, and obtain the adjustable resource in the microgrid in the set Active power output reference value in time scale;

[0155] The execution module performs power flow calculation on the microgrid based on the active output reference value, obtains the initial voltage value of each node, and checks whether each node has a voltage exceeding the limit;

[0156] The correction module, for the node where the voltage exceeds the limit, iteratively corrects the active output range of the adjustable resource through the set ...

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Abstract

The invention provides a micro-grid power safety and economic dispatching method comprising the following steps of bringing the adjustable resource operation data in the micro-grid into a pre-established micro-grid operation model, obtaining an active output reference value of the adjustable resources in the micro-grid through optimization solution by combining the renewable energy prediction dataand the load prediction data, and performing load flow calculation based on the active output reference value to obtain initial voltage values of each node; for the nodes where the voltage exceeds the limit, correcting the active output range of the adjustable resources by a set voltage control strategy until the voltage over-limit is eliminated, and converging the objective function with the lowest total operating cost of the micro-grid controllable generator set to the optimal solution. The technical solution provided by the invention realizes the optimal operation of the micro-grid by optimizing the active output of the adjustable resources in the network.

Description

technical field [0001] The invention relates to the field of optimal dispatching of distribution networks, in particular to a method and system for safe and economical dispatching of microgrid electric energy. Background technique [0002] Under the realistic background of depletion of fossil energy and the requirements of clean and low-carbon economic development, the traditional grid construction mode of centralized power generation and long-distance transmission shows more and more limitations. In order to improve the energy structure, ensure energy security, and achieve sustainable economic and social development, the development and utilization of renewable energy has gradually received national attention. However, when a large number of distributed power sources are connected to the power grid, it will have adverse effects on the power grid and threaten the safe and stable operation of the system. [0003] As a new power technology developed in recent years, microgrid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/46H02J3/48H02J3/32
CPCY02E70/30
Inventor 管益斌周昶雷震刘海璇金鑫许晓慧郝雨辰陈丽娟吴福保朱旭杨宇琼
Owner CHINA ELECTRIC POWER RES INST
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