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Synchronous fixed frequency microgrid operation control method and system

A technology of operation control and micro-grid, applied in the direction of single-network parallel feeding arrangement, electrical components, circuit devices, etc., can solve the problems of complex control system and implementation method, broken frequency and voltage stability, high requirements for communication system, etc., to achieve Effects of Overcoming Power Oscillation and Stability Problems and Simplifying the Operation Control Method

Active Publication Date: 2018-04-20
SHANDONG UNIV OF TECH +1
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AI Technical Summary

Problems solved by technology

The effect of layered control is relatively good, which can realize the optimization and efficient operation of the microgrid, but the control system and implementation method are relatively complicated, and the requirements for the communication system are relatively high, and there is still the risk of frequency and voltage stability damage

Method used

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  • Synchronous fixed frequency microgrid operation control method and system
  • Synchronous fixed frequency microgrid operation control method and system
  • Synchronous fixed frequency microgrid operation control method and system

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Embodiment Construction

[0036] Figure 1-8 It is the best embodiment of the present invention, below in conjunction with attached Figure 1-8 The present invention will be further described.

[0037] Such as figure 1 As shown, a synchronous fixed-frequency microgrid operation control method includes a synchronous fixed-frequency microgrid operation control system. The synchronous fixed-frequency microgrid operation control system includes a synchronous signal unit, a current control unit, and an inverter. The synchronous signal unit outputs The synchronous time signal is sent to the current control unit, and the output terminal of the current control unit is connected to the control signal input terminal of the inverter.

[0038]Under normal circumstances, the synchronization signal unit receives the 1PPS second pulse signal sent by it through the satellite timing signal (such as GPS, Beidou, etc.), and the second pulse signal is sent to the current control unit, and the current control unit combin...

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Abstract

The invention discloses a synchronous fixed frequency microgrid operation control method and system, and belongs to the automatic field of an electric power system. The synchronous fixed frequency microgrid operation control system comprises a plurality of distributed energy resources; the output ends of the distributed energy resources are connected with the input end of an inverter; the output end of the inverter is connected to a microgrid; the control method is characterized by comprising the following steps: 1, a synchronous signal unit receives a satellite time signal; 2, a current control unit gives out a control signal to the inverter; and 3, the inverter outputs an alternating current signal; and the inverter adjusts the output automatically to enable the voltage amplitude value output by the output end to satisfy the power grid requirement. According to the synchronous fixed frequency microgrid operation control method and system, the characteristics of independent control offrequency and phase of the alternating current can be generated through the pulse signal sent through the synchronous signal unit and by combination with the inverter, so that the outputs of all thedistributed energy resources in the micro grid can be actively adjusted and controlled in the same time reference system, and the problem of power oscillation and problem in stability caused by the conventional alternating current power grid frequency control method can be overcome.

Description

technical field [0001] A synchronous fixed-frequency micro-grid operation control method and system, belonging to the field of power system automation. Background technique [0002] Microgrid is an effective way to efficiently utilize distributed renewable energy, and the combination of microgrid and large power grid is the development direction of the future power system. The microgrid has two operating modes: grid-connected and off-grid (island). When the large power grid fails, the microgrid operates in an island mode, which can ensure reliable power supply for users. Distributed Energy Resources (DER) in microgrids are generally connected through power electronic inverter devices, among which intermittent power sources such as photovoltaic power generation and wind power generation account for a high proportion, and are limited by investment and operation and maintenance costs. Often lacks good communication conditions, and does not have a complete operation monitoring ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/40
CPCH02J3/382H02J3/40
Inventor 徐丙垠赵艳雷彭克张存山仉志华薛永端
Owner SHANDONG UNIV OF TECH
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