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Cooperative control method suitable for AC/DC hybrid distribution network

A technology of AC-DC hybrid and distribution network, which is applied in the direction of AC network circuit, DC power supply parallel operation, AC network load balancing, etc., and can solve the problems of equipment utilization reduction, reliability decline, distribution network coordinated control problems, etc.

Inactive Publication Date: 2019-04-16
STATE GRID JIBEI ELECTRIC POWER COMPANY +3
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  • Abstract
  • Description
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Problems solved by technology

[0004] However, with the continuous increase of load density in big cities, the scale of the distribution network continues to expand. Due to problems such as short-circuit capacity and electromagnetic ring network, the urban distribution network usually operates in a high-voltage partition and medium-voltage open-loop mode, resulting in system equipment Lower Utilization, Lower Reliability
At the same time, customers' requirements for power supply reliability and power quality are constantly increasing. social impact
[0005] Research results in recent years have shown that the AC-DC hybrid distribution network based on flexible DC technology is more suitable for the development of modern urban distribution networks, but the coordinated control of two different distribution networks has always been a major problem.
At present, there is no mature technical solution that can realize the above functions

Method used

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  • Cooperative control method suitable for AC/DC hybrid distribution network
  • Cooperative control method suitable for AC/DC hybrid distribution network
  • Cooperative control method suitable for AC/DC hybrid distribution network

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Embodiment Construction

[0091] The present invention will be further described below in conjunction with the accompanying drawings.

[0092] The technical solutions adopted in the present invention are mainly divided into constructing the actual frame structure based on most current field projects, defining and analyzing various operation modes of the AC-DC hybrid distribution network, and proposing flexible interconnection devices, A battery energy storage system and a control method for a photovoltaic power generation unit.

[0093] Such as figure 1 As shown, one is suitable for AC-DC hybrid distribution network, including: three AC buses and one DC bus, in which the three AC buses are connected to circuit breakers and AC loads respectively, and the other side of the circuit breaker is connected to the AC grid through the line. Phase connection; the DC bus side is connected to four bidirectional buck-boost converters through lines, of which the other ends of two bidirectional buck-boost converters...

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Abstract

The invention discloses a cooperative control method suitable for an AC / DC hybrid distribution network, comprising the following steps: step 1, constructing a cooperative control system suitable for the AC / DC hybrid distribution network; step 2, defining operation modes of the AC / DC hybrid distribution network; and step 3, adjusting the control methods of the flexible interconnection device, the battery energy storage system and the photovoltaic power generation unit according to different operating modes of the AC / DC hybrid distribution network. Compared with the traditional control method for the AC / DC hybrid distribution network, the method provided by the invention can further improve the power supply reliability of the AC / DC hybrid distribution network.

Description

technical field [0001] The invention relates to a coordinated control method suitable for an AC-DC hybrid distribution network, which belongs to the technical field of power system automation. Background technique [0002] At present, with the expansion of the scale of the AC grid and the increase of the voltage level, the short-circuit capacity of the complex AC interconnected grid is increasing, and its operation control process is becoming more and more complicated, and the impact on the safety and stability of the system is becoming more and more serious. At the same time, in the face of large-scale access to DC equipment such as data centers, electric vehicles, distributed power sources (such as photovoltaics) and LED lighting, the efficiency of power supply and distribution will be affected due to the many links of power conversion in the AC power grid. [0003] Compared with the AC grid, there is no synchronization problem in the DC grid, and the flexible control of t...

Claims

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Application Information

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IPC IPC(8): H02J5/00H02J1/10H02J3/38H02J3/32
CPCH02J3/385H02J1/10H02J3/32H02J5/00Y02E10/56Y02E70/30
Inventor 梁东覃朝云杨静张建宗瑾龙飞周磊应俊赵景涛蔡月明刘明祥郑舒徐志华洪涛黄金魁
Owner STATE GRID JIBEI ELECTRIC POWER COMPANY
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