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Isolated microgrid frequency modulation control method based on measured frequency response identification

A control method and frequency response technology, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as lack of effective methods for control parameters, system frequency oscillation, and slow frequency modulation speed

Active Publication Date: 2016-03-16
BEIJING SIFANG JIBAO AUTOMATION +1
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Problems solved by technology

However, in the exit stage of energy storage emergency frequency modulation, the rotating main power supply has a large inertia, and the frequency modulation speed is slow, while the energy storage inverter is a power electronic device, and the action is fast. If the adjustment speed of the two is inconsistent, it is easy to appear The system frequency oscillates, so the speed of the energy storage system in the frequency modulation exit phase must match the main power regulation speed
Although some studies have used low-pass filtering algorithms to improve the matching performance with the frequency regulation speed of the main power supply in the emergency frequency regulation exit stage of energy storage, there is no effective method for the formulation of control parameters

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  • Isolated microgrid frequency modulation control method based on measured frequency response identification
  • Isolated microgrid frequency modulation control method based on measured frequency response identification
  • Isolated microgrid frequency modulation control method based on measured frequency response identification

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Embodiment Construction

[0038] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] An isolated microgrid frequency modulation control method based on measured frequency response identification disclosed by the present invention includes the following steps:

[0040] Step 1, such as figure 1 As shown, the frequency modulation control area is divided into dead zone, sub-emergency zone and emergency zone according to the microgrid frequency deviation. Set the frequency secondary emergency lower limit to 49.97Hz, frequency secondary emergency upper limit to 50.03Hz, frequency emergency lower limit to 49Hz, and frequency emergency upper limit to 51Hz. As shown in Table 1:

[0041] Table 1 Frequency Threshold Settings

[0042] Step 2. Monitor the system frequency Freq at the current moment now . When 49.97Hznow When now now When ≤49.97Hz, the microgrid is in the sub-emergency area of ​​frequency modulatio...

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Abstract

The invention discloses an isolated microgrid frequency modulation control method based on measured frequency response identification. The method provides a frequency modulation control strategy aiming at the operation features of an isolated microgrid and based on a principle of segmented frequency modulation control. According to the control strategy, the emergency degrees of the frequency modulation control are graded according to the frequency deviations of the microgrid, different active power control modes are used in different control areas; control parameters based on the measured frequency response identification are used, and thereby renewable energy sources can be maximally used for generating power, meanwhile the charging and discharging times of an energy storage battery are reduced, and an oscillation problem due to the fact that power modulation speeds are inconsistent is avoided. When disturbance occurs, the strategy can support the frequency of the microgrid, and improve the stability of the frequency of the microgrid.

Description

technical field [0001] The invention belongs to the technical field of power system micro-grids, and in particular relates to a frequency modulation control method for isolated micro-grids based on measured frequency response identification. Background technique [0002] The large-scale application of distributed generation based on renewable energy is one of the most effective solutions for the decarbonization of the future power industry. Renewable energy power generation technology has received more and more attention due to its advantages of non-pollution, renewability, and wide distribution. However, renewable energy power generation has the characteristics of large volatility and strong randomness. Therefore, configuring an energy storage system with a certain capacity on site can effectively suppress the fluctuation of the output power of renewable energy generation and improve the ability of the grid to accept renewable energy generation. [0003] As an important p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/28H02J3/24
CPCH02J3/24H02J3/28H02J3/388H02J2203/20Y02E70/30Y02P80/14
Inventor 孙晓彦时伯年孙刚刘志超
Owner BEIJING SIFANG JIBAO AUTOMATION
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