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Droop-PQ type micro-grid inverter power supply with hysteretic characteristics

A technology with inverter power supply and hysteresis characteristics, which is applied in the direction of single-grid parallel feeding arrangement, etc., can solve the problems of frequency or voltage disturbance, the controller is easy to trigger by mistake, and the operation flexibility is insufficient, so as to increase the power adjustment range. , to avoid frequent switching, the effect of good anti-disturbance performance

Active Publication Date: 2014-11-26
FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID +1
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Problems solved by technology

However, this switching will cause a large frequency or voltage disturbance, the operation flexibility is insufficient, and the controller is prone to false triggering

Method used

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  • Droop-PQ type micro-grid inverter power supply with hysteretic characteristics
  • Droop-PQ type micro-grid inverter power supply with hysteretic characteristics
  • Droop-PQ type micro-grid inverter power supply with hysteretic characteristics

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Embodiment Construction

[0021] The present invention is further described below in conjunction with accompanying drawing and embodiment:

[0022] Such as Figure 4 As shown, the system structure involved in the present invention includes a distributed primary energy source, a detection module, a control module, a drive module and an inverter converter bridge. The detection module obtains the sampling signal and obtains the active and reactive power of the microgrid system through calculation; the control module makes a logical judgment on the active and reactive power transmitted by the detection module and the set reference variable, and generates a control signal that acts on the drive module ;The drive module modulates the control signal into PWM control pulses, amplifies the PWM control pulses and drives the inverter converter bridge; the inverter converter bridge is mainly used for the connection between distributed power sources and micro grids, and the electric energy Exchange, the distribute...

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Abstract

The invention discloses a droop-PQ type micro-grid inverter power supply with hysteretic characteristics. The droop-PQ type micro-grid inverter power supply comprises distributed primary energy, a detection module, a control module, a driver module and an inverter convertor bridge. The detection module comprises a sampling unit and an input signal processing unit; the control module is used for generating control signals acting on the driver module in the mode that information of active power and reactive power, sent by the detection module, of a system is compared with a power limit value preset for the power supply; a control method of the control module involves droop-PQ control, and the control module has four threshold values; the driver module comprises a PWM generating circuit and a drive amplifying circuit; the inverter convertor bridge is used for connection and electric energy conversion between the distributed primary energy and a micro-grid. The droop-PQ type micro-grid inverter power supply enlarges the power regulation range, provides stable voltage and frequency and enables the system to operate reliably and stably and to have good anti-disturbance performance.

Description

technical field [0001] The invention relates to the field of power electronic devices and their control, and relates to a droop-PQ micro-grid inverter power supply with hysteresis characteristics. Background technique [0002] Conventional grids have grown rapidly over the past few decades as demand for electricity continues to grow. However, due to its high cost, difficult operation, fuel shortage, and increasing environmental pollution, the development of environmentally friendly, flexible, and renewable energy-based distributed power generation technologies has been promoted. In order to give full play to the advantages of distributed power generation and solve the contradictions between the large power grid and it, the distributed power generation system is generally interconnected to form a micro-grid. However, with the access of the microgrid, some new problems have emerged, mainly in what kind of control method the microgrid adopts in the island operation mode to mai...

Claims

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Application Information

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IPC IPC(8): H02J3/38
Inventor 黄小耘申展黄红远雷金勇彭飞进郭晓斌李响许爱东
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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