Flexible interconnection device optimization preparation method and system based on DG power prediction

A technology of power prediction and preparation method, which is applied in the direction of power generation prediction, reactive power adjustment/elimination/compensation in circuit devices and AC networks, and can solve the problems of restricting the flexibility of voltage distribution network operation control, limited regulation means, Unbalanced feeder load and other problems, to achieve the effect of improving local consumption capacity, improving power supply reliability, and improving use efficiency

Pending Publication Date: 2022-05-17
GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the low-voltage distribution network is facing many challenges such as diversified electricity demand, large-scale distributed generation, and complicated power flow control. The traditional grid structure and transformers have problems such as unreasonable structure, limited control methods, and low utilization rate. Restricts the flexibility of voltage distribution network operation control, resulting in unbalanced feeder load
[0003] At this stage, a large number of new energy sources that are integrated into the grid are mainly wind energy and solar energy. These two distributed power sources are greatly affected by environmental factors. , Voltage limit, feeder load imbalance and other problems become more prominent, and further lead to increased system operating loss, decreased distributed energy consumption capacity, and overloaded distribution equipment, seriously affecting the economic operation of the distribution network
Some existing literatures record that distribution network voltage control is realized through on-load tap changer (OLTC). Indirect direct ring network scheme, balanced feeder load, and the problems brought about by it include cycle power difference, electromagnetic ring network, etc.

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  • Flexible interconnection device optimization preparation method and system based on DG power prediction
  • Flexible interconnection device optimization preparation method and system based on DG power prediction
  • Flexible interconnection device optimization preparation method and system based on DG power prediction

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Embodiment 1

[0036] refer to Figures 1 to 2 , which is the first embodiment of the present invention, which provides a method for optimizing the configuration of flexible interconnection devices based on DG power prediction, where DG is a distributed power source, and the method includes:

[0037]S1. Use the distributed power forecasting module and the capacity of the existing distributed power in the region to predict the estimated power generation within a certain period of time.

[0038] S1 includes:

[0039] Collect weather forecast data, real-time power data and real-time weather data;

[0040] Predict the estimated power generation within a certain period of time according to the collected data; use the combination of indirect prediction method and direct prediction method or the combination of physical method and statistical method to predict photovoltaic power generation. The gray neural network combination model used combines the indirect prediction method with the direct predi...

Embodiment 2

[0047] refer to Figures 1 to 6 , is the second embodiment of the present invention, and this embodiment resides in the previous embodiment

[0048] The flexible interconnection device adopts a modular multi-level control method, and performs system modulation through a modulation method in which modulation waves are reversely stacked. The flexible interconnection device is used to connect two alternating currents, convert the alternating currents at both ends into direct currents, and communicate the direct currents at both ends. Energy distribution is realized through flexible interconnection devices (between distribution networks). Distributed energy forecasting is used to estimate power generation in advance, and combined with actual consumption on the grid, it is used to predict in advance which distribution network the flexible interconnection device needs. How much power the grid transmits. MMC is a modular multi-level converter. Direct power control is used for MMC. ...

Embodiment 3

[0065] refer to Figure 9 , which is the first embodiment of the present invention, this embodiment provides a DG power prediction based flexible interconnect device optimization preparation system, including the first layer control unit 100, the second layer control unit 200 and the third layer control unit 300 . The direct power control strategy of the present invention is the key to realizing the steady-state operation of multiple flexible interconnection devices, and the control system is divided into three levels of control according to the control object and the system response time.

[0066] The first layer control unit 100 is used to realize the energy management of the global system, including the prediction of electricity consumption and power generation, and to realize the optimal configuration of the capacity of the flexible interconnection device in combination with the system loss, the network parameters of the system itself, and the total purchase cost of the syst...

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Abstract

The invention discloses a flexible interconnection device optimization preparation method and system based on DG power prediction, and the method comprises the steps: carrying out the prediction of an estimated generating capacity in a certain time period through a distributed power supply power prediction module and the capacity of an existing distributed power supply of a local region; the estimated electricity consumption is obtained through statistics by combining the electricity consumption trend of the user side of the low-voltage power distribution network over the years; and selecting a certain number of flexible interconnection device capacities in combination with the estimated generating capacity and the estimated power consumption. According to the invention, the flexible interconnection device is adopted, the specified amount of active power and reactive power can be output through the MMC, the load among the power distribution networks is balanced, and the electric energy quality is improved.

Description

technical field [0001] The invention relates to the technical field of power system power distribution, in particular to a method and system for optimizing the configuration of flexible interconnection devices based on DG power prediction. Background technique [0002] As the last link from the generation of electric energy to the use of users, the distribution network plays a crucial role in the power system. With the rapid development of energy technology in my country, especially in Guizhou and other regions of my country, new energy resources are abundant. After the large-scale connection of new energy to the power grid, it will inevitably bring about the problem of power flow in the power grid. New energy power generation has randomness and uncertainty, and is closely related to weather conditions. Therefore, new energy power generation can be estimated to a certain extent through weather forecasting. At the same time, the low-voltage distribution network faces many cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/38H02J3/06H02J3/18H02J3/00H02J3/46H02J3/01H02J13/00
CPCH02J3/36H02J3/381H02J3/06H02J3/18H02J3/004H02J3/466H02J3/01H02J13/00026H02J2300/40H02J2300/22H02J2300/28H02J2203/20Y02A30/00
Inventor 李颖李庆生王永军田雨杨永祥王磊吕波刘峰陈青徐进唐乾任佳宽夏郁玮
Owner GUIZHOU POWER GRID CO LTD
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