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Control method for power type capacitor cooperating with PMSG fan to participate in primary frequency modulation

A control method and power-based technology, applied in the direction of reducing/preventing power oscillation, wind power generation, reducing greenhouse gases, etc., can solve the problems such as the frequency regulation capability of wind turbines without deep excavation, damage to wind turbine converters, and difficulty in operation, etc. Achieve the effect of enhancing the ability to participate in the primary frequency regulation of the power grid, reducing the capacity allocation and improving the economy

Active Publication Date: 2022-04-05
CHINA THREE GORGES CORPORATION
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Problems solved by technology

However, the method of sharing the DC bus may cause the current exceeding the original design peak value to flow on the DC bus, and at the same time, the current of the switching device of the wind turbine converter may exceed the maximum peak current it can withstand, causing irreversible damage to the wind turbine converter. damage
Therefore, this method of sharing the DC bus requires the close cooperation of the wind turbine manufacturer, starting from the selection of components to carry out in-depth transformation of the wind turbine converter, which is obviously difficult to operate in engineering practice
[0005] It can be seen from the above existing technologies that the existing energy storage and wind turbines participating in the primary frequency regulation of the power grid are mainly divided into two types: one is to use centralized energy-type energy storage, starting from the frequency regulation capability of the energy storage itself , but did not dig deep into the frequency modulation capability of the wind turbine itself; the other is to use distributed power energy storage, but because of the way of sharing the DC bus, although the cost of the energy storage converter can be saved, it needs to be used from The selection of components began to carry out in-depth transformation of wind turbine converters, which is obviously difficult for engineering applications

Method used

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  • Control method for power type capacitor cooperating with PMSG fan to participate in primary frequency modulation
  • Control method for power type capacitor cooperating with PMSG fan to participate in primary frequency modulation
  • Control method for power type capacitor cooperating with PMSG fan to participate in primary frequency modulation

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Embodiment Construction

[0046] Such as Figure 1 to Figure 5 As shown, a control method for a power type capacitor to cooperate with a PMSG fan to participate in primary frequency modulation, which includes the following steps:

[0047] A1) The present invention installs an energy storage frequency modulation unit at the grid connection point of the PMSG wind turbine, mainly including energy storage converters and supercapacitors, such as figure 1 shown;

[0048] A2) Detect the frequency f of the grid-connected point of the PMSG wind turbine through a phase-locked loop (PLL)pll , and calculate the grid-connected point frequency deviation Δf, the calculation method is as follows:

[0049] Δf=f n -f pll (1)

[0050] Among them, f n = 50Hz is the rated frequency of the grid;

[0051] A3) Set the FM dead zone once dz , and judge whether the absolute value of the grid-connected point frequency deviation Δf exceeds f dz . If |Δf|≤f dz , then return to A2) to continue to detect Δf, otherwise ente...

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Abstract

A control method for a power type capacitor cooperating with a PMSG fan to participate in primary frequency modulation adopts a super capacitor to upgrade a PMSG fan grid-connected converter, provides a control strategy for energy storage and the PMSG fan to participate in primary frequency modulation of a power grid cooperatively, and solves the problem of weak primary frequency modulation capability of the PMSG fan at present. According to the method, the structure and control of a back-to-back converter of the PMSG fan do not need to be changed, reserve capacity for frequency modulation does not need to be reserved, a wind storage cooperative control mode is adopted, the frequency modulation capacity of the fan can be utilized to the maximum extent, capacity configuration of a super capacitor is reduced as much as possible, and the economical efficiency of the PMSG fan participating in power grid frequency modulation in the whole life cycle is improved.

Description

technical field [0001] The invention belongs to the technical field of new energy power generation, and in particular relates to a control method in which a power type capacitor cooperates with a PMSG fan to participate in primary frequency modulation. Background technique [0002] Wind turbines generally operate in MPPT mode, so the frequency regulation capability of wind turbines is mainly limited by the upward power regulation capability, and they cannot participate in the primary frequency regulation of the power grid under all working conditions. In addition, the latest "Guidelines for the Safety and Stability of Power Systems GB 38755-2019" requires new energy to be grid-friendly and to participate in primary frequency regulation of the power grid just like traditional thermal power and hydropower. Therefore, many scholars have conducted research on PMSG wind turbines participating in the primary frequency regulation of the power grid, as follows: [0003] Li Junhui, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38H02J3/32H02J3/48
CPCY02E10/76Y02E70/30
Inventor 刘瑞阔邹祖冰谷昱君孙勇姚维为吴海飞
Owner CHINA THREE GORGES CORPORATION
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