Method for enabling wind power unit to participate in primary frequency modulation of power system at different bands

A wind turbine and power system technology, applied in the direction of reducing/preventing power oscillation, etc., can solve problems such as the contradiction between wind field economy and frequency modulation capacity

Active Publication Date: 2017-03-22
黑龙江省工研院资产经营管理有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the wind farm economics and the frequency modulation capacity are contradictory when the wind turbine unit participates in

Method used

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  • Method for enabling wind power unit to participate in primary frequency modulation of power system at different bands
  • Method for enabling wind power unit to participate in primary frequency modulation of power system at different bands
  • Method for enabling wind power unit to participate in primary frequency modulation of power system at different bands

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specific Embodiment approach 1

[0046] Specific implementation mode 1: The method for participating in the primary frequency regulation of the power system in the wind turbine component frequency band described in this implementation mode includes the following steps:

[0047] Step 1: Design as figure 2 The high-pass filter shown in the solid line box on the left Make the fluctuation frequency in the grid higher than The frequency deviation signal is separated, denoted as Δf Hi ; design as figure 2 The low-pass filter shown in the dashed box on the left Reduce the frequency of fluctuations in the power grid to less than The frequency deviation signal is separated, denoted as Δf Li ; where H i is the rotor inertia time constant of the wind turbine, the subscript i represents the i-th wind turbine, and s represents the transfer function;

[0048] Step 2: Introduce an inertial control link and a droop control link in the wind turbine. The inertial control link includes a virtual inertial link. The vi...

specific Embodiment approach 2

[0077] Specific implementation method 2: Based on the measured data intercepted from a wind farm between 4 o'clock and 5 o'clock, a combined wind-fire frequency modulation model with a wind power penetration rate of 20% is established, and a set of disturbances with a standard deviation of 0.008 is used for simulation. There are 60 2MW units in the wind farm, the unit model is W2000-87, the current limited output is 120MW, and there is no wind curtailment. The basic parameters of the W2000-87 model wind turbine are shown in Table 1.

[0078] Table 1: Basic parameters of 2000-87 model wind turbines

[0079]

[0080] Step 1: Wind turbine rotor inertia time constant H i for 5s, design as figure 2 The high-pass filter shown in the solid line box on the left The frequency deviation signal Δf with a fluctuating frequency higher than 0.2Hz in the power gridHi separated out, such as Figure 6 shown;

[0081] Step 2: Introduce inertial control into the wind turbine, and the a...

specific Embodiment approach 3

[0092] Specific implementation method 3: Based on the measured data intercepted from 3 o'clock to 4 o'clock in a certain wind farm, a wind-fire joint frequency modulation model with a wind power penetration rate of 20% is established, and a set of disturbances with a standard deviation of 0.008 are superimposed with a step signal to form The resulting composite disturbance is simulated. There are 60 2MW units in the wind farm, the unit model is W2000-87, and its basic parameters are shown in Table 1. When the wind speed is 10.5m / s, the limited output of the wind farm is 94MW.

[0093] Step 1: Wind turbine rotor inertia time constant H i for 5s, design as figure 2 The high-pass filter shown in the solid line box on the left The frequency deviation signal Δf with a fluctuating frequency higher than 0.2Hz in the power grid Hi separated out, such as Figure 13 Shown by the solid line in (take the power grid load sudden drop of 1% as an example); the design is as follows f...

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Abstract

The invention provides a method for enabling a wind power unit to participate in primary frequency modulation of a power system at different bands, relates to a technology for enabling the wind power unit to participate in primary frequency modulation of a power network and aims at solving the problem of the contradiction between the wind farm economy and the frequency modulation capacity when the wind power unit participates in primary frequency modulation. The method comprises the steps of firstly separating a high-frequency signal and a low-frequency signal in the power network by using a high-pass filter and a low-pass filter respectively; introducing an inertial control link and a droop control link into the wind power unit and setting an operation mode according to a current wind curtailment condition of a wind farm, wherein the operation mode is an optimal power tracking mode or a suboptimal power tracking mode; and finally calculating electromagnetic power reference values under two operation modes respectively, enabling the electromagnetic power reference values to act on a rotor converter and completing the process that the wind power unit participates in primary frequency modulation of the power system at different bands. According to the method provided by the invention, the target that the wind power unit participates in primary frequency modulation of the power system to the maximum extent when output is not lost is achieved, and the method is suitable for frequency modulation of the wind power unit.

Description

technical field [0001] The invention relates to a technology for wind turbines to participate in primary frequency regulation of a power grid. Background technique [0002] Wind power grid-connected operation is an effective form of large-scale development of wind energy. However, with the continuous increase of wind power installed capacity, the original power structure dominated by thermal power and hydropower has changed. The volatility of the grid also has a certain impact on the frequency stability and active power balance of the grid. If the wind turbines are still only processed as negative loads and superimposed on the active power balance of the grid, it will bring huge frequency regulation pressure to the thermal power units. Not only does the frequent start and stop of thermal power units affect its service life, but it also limits the further development of wind power to a large extent. [0003] At present, there are three main control strategies for wind turbin...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 郭钰锋马欣彤王琦张童童陈宁钱敏慧
Owner 黑龙江省工研院资产经营管理有限公司
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