Day-ahead optimal dispatching method for hybrid ac/dc systems with power electronic transformers

An AC-DC hybrid and power electronics technology, applied in the direction of AC network load balancing, electrical components, circuit devices, etc., can solve the problems of complex AC-DC conversion links and poor ability of power grid uncertainties, so as to improve the consumption capacity and reduce the Effect of improving operating cost and economy

Active Publication Date: 2018-12-14
TIANJIN UNIV +1
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  • Application Information

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Problems solved by technology

[0009] The invention provides a method for optimal dispatching of an AC-DC hybrid system including a power electronic transformer. The invention establishes a system-level optimal operation model to improve the complexity of the AC-DC conversion link existing in the current power system and the power grid to cope with uncertain factors. Deficiencies of poor ability, see the description below:

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  • Day-ahead optimal dispatching method for hybrid ac/dc systems with power electronic transformers
  • Day-ahead optimal dispatching method for hybrid ac/dc systems with power electronic transformers
  • Day-ahead optimal dispatching method for hybrid ac/dc systems with power electronic transformers

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Embodiment 1

[0059] A day-ahead optimal scheduling method for distributed energy in AC-DC hybrid systems with power electronic transformers, see figure 1 , the method includes the following steps:

[0060] 101: Introduce power electronic transformers into AC / DC hybrid systems, and establish objective functions for day-ahead optimal scheduling;

[0061] 102: Establish the steady-state model of the power electronic transformer, establish the constraints of the micro gas turbine model, the constraints of the energy storage battery model, and the power balance constraints of the AC system and the DC system;

[0062] 103: Based on the above-mentioned steady-state model, objective function and constraints, realize the full consumption of distributed energy and the economic optimization of the AC-DC hybrid system.

[0063] To sum up, the embodiment of the present invention applies power electronic transformers to the day-ahead optimal scheduling of distributed energy sources in AC-DC hybrid syst...

Embodiment 2

[0065] Combine below Figure 2-Figure 4 The scheme in Example 1 is further introduced, see the following description for details:

[0066] 1. Containing PET AC-DC hybrid system (i.e. network)

[0067] The topology diagram of a typical AC-DC hybrid system based on power electronic transformers is shown in Fig. figure 2 As shown, under this structure, the main network is directly connected to one port of the PET, and is connected to the DC network and the AC network through the other two ports of the PET.

[0068] The distributed renewable energy in the DC network is mainly connected to the grid through DC-DC converters, and the distributed renewable energy in the AC network is mainly connected to the grid through DC-AC, AC-DC-AC and other converters. Distributed renewable energy sources choose access methods according to various influencing factors such as their own characteristics, operating costs, and operating efficiency. Photovoltaic power generation (ie figure 2 phot...

Embodiment 3

[0113] Combine below Figure 5-Figure 8 The scheme in embodiment 1 and 2 is carried out feasibility verification, see the following description for details:

[0114] The structure of AC-DC hybrid system including power electronic transformer is as follows: Figure 5 As shown, the system consists of an AC network and a DC network. The voltage level of the AC network is 380V, and the voltage level of the DC network is 400V. The power electronic transformer is used for energy transmission in the middle. The three ports of the power electronic transformer are not connected with the AC power system and In addition to the DC power system connection, there is also a port directly connected to the main grid. When the energy supply in the AC and DC power system is insufficient or it is more economical to purchase power from the main grid, the power system will purchase power from the main grid port and pass the power Electronic transformers are injected into the AC and DC power system...

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Abstract

The invention discloses a day-ahead optimal dispatching method of an AC/DC hybrid system containing a power electronic transformer. The method comprises the following steps: introducing the power electronic transformer into the AC/DC hybrid system to establish an objective function of day-ahead optimal dispatching; The steady-state model of power electronic transformer, the constraint conditions of micro gas turbine model, the constraint conditions of energy storage battery model, the power balance constraint conditions of AC system and DC system are established. Based on the above steady-state model, objective function and constraint conditions, the distributed energy consumption and economic optimization of AC/DC hybrid system are realized. The method controls the power transmission between the AC network and the DC network through the power regulating function of the power electronic transformer, and can effectively realize the full consumption of the distributed generation. In addition, the reasonable application of the distributed generation reduces the operation cost of the power system and realizes the economic operation of the AC/DC hybrid system.

Description

technical field [0001] The invention relates to the field of power electronic transformers, in particular to a method for optimal dispatching of an AC-DC hybrid system including a power electronic transformer. Background technique [0002] In recent years, with the continuous development of micro-grid and distributed generation technology, more and more clean energy has been applied in the power system. As our country is currently facing severe energy and environmental problems, more distributed power generation devices are connected to the power grid, and reducing the proportion of thermal power generation that pollutes the environment in power production has become an inevitable trend in the development of the power industry. [1] . [0003] Distributed energy access to the grid is divided into two types: AC access and DC access. Compared with AC access, DC access can save commutation links and reduce system losses. In addition, DC access to the grid does not need to cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00H02J3/46H02J3/32
CPCH02J3/32H02J3/46H02J5/00H02J2203/20
Inventor 穆云飞郭世琦贾宏杰余晓丹黄强袁晓东李强柳丹
Owner TIANJIN UNIV
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