Novel permanent-magnet synchronous fan grid-connected control method
A permanent magnet synchronization and control method technology, applied in wind power generation, AC network circuits, single-network parallel feeding arrangement, etc., can solve the problems of high cost and high operating cost of full-power converters, reduce initial investment, reduce The effect of investment fees
Inactive Publication Date: 2018-05-22
NANJING UNIV OF SCI & TECH
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Problems solved by technology
However, in the traditional PWM rectifier followed by a voltage source PWM inverter topology, each unit is connected in series with a full-power converter during operation, and the cost of the full-power converter is relatively high, accounting for about 20% of the entire system cost. % or so, higher operating costs
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[0024] The present invention is a new type of permanent magnet synchronous fan grid-connected control strategy, the configuration method flow chart is as follows figure 1 shown, including the following steps:
[0025] Step 1. Control the wind speed to be close to the speed corresponding to the low-frequency bus frequency by controlling the dual PWM converters.
[0026] Step 2. When the motor stator voltage and the low-frequency bus voltage meet the quasi-synchronous grid connection conditions, short-circuit the dual PWM converters connected in series in the main circuit, and directly connect the generator stator to the box-type transformer.
[0027] Step 3: Select the back-to-back converter station, and the electric energy is transmitted to the back-to-back converter station at low frequency, where it is converted into power frequency and sent to the power grid.
[0028] Further, in the first step, the most important aspect of this grid-connected method is the control of the ...
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The invention discloses a novel permanent-magnet synchronous fan grid-connected control method, and the method comprises the steps: 1), firstly carrying out the control of a double-PWM converter, controlling the frequency of output electric energy of a generator stator and the voltage amplitude through a controller-side rectifier, and controlling a wind power rotating speed to approach to a rotating speed corresponding to the frequency of a low-frequency bus; 2), enabling the double-PWM converter connected to a main circuit to be in a short circuit state when a motor stator voltage and the voltage of the low-frequency bus meet a quasi-synchronization grid-connected condition, and enabling the generator stator to be directly connected to a box-type transformer; 3), selecting a back-to-backcurrent converter station, transmitting the electric energy to the back-to-back current converter station at low frequency, converting the electric energy into power frequency at the converter station, and inputting the power frequency into a power grid. The method provides a novel permanent-magnet synchronous fan grid-connected control strategy, and only one full-power rectifier is used for enabling a plurality of units to be connected to the low-frequency bus in a grid connected manner. The grid-connected control strategy saves an AC-DC-AC converter of each unit, thereby reducing the investment and achieving a positive effect in reducing the initial investment.
Description
technical field [0001] The invention belongs to the application of new energy and existing power grid connection, and particularly relates to the research on the control method of permanent magnet synchronous fan grid connection, and the proposed scheme is beneficial to reduce engineering investment. Background technique [0002] The increasingly severe energy supply and global warming have caused countries to reflect deeply on the way energy is used. Energy has increasingly become a global issue, and the energy issue has become a major strategic issue related to the overall social and economic development. In recent years, renewable energy has been highly valued by the international community and most countries because of its clean, low-carbon, and sustainable characteristics. [0003] Among many renewable energy sources, the development and utilization of wind energy has attracted much attention. In recent years, the application of multi-pole permanent magnet synchronous...
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IPC IPC(8): H02J3/38
CPCH02J3/386Y02E10/76
Inventor 卢烨王俊刘屹东许鸣吉黄轶群
Owner NANJING UNIV OF SCI & TECH