Inverter controller with function of participating in system low-frequency oscillation suppression
A low-frequency oscillation and inverter technology, which is applied in the direction of output power conversion device, reduction/prevention of power oscillation, conversion of AC power input to DC power output, etc., to achieve the effect of suppressing oscillation
Active Publication Date: 2020-02-21
STATE GRID SICHUAN ECONOMIC RES INST
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But in VSG, these methods use dω / dt and △ω as a virtual moment of inertia, which only exists in the control algorithm of the inverter, not a real physical quantity
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[0034] Such as figure 1 , figure 2 as shown, figure 1 It is a main circuit topology and control block diagram of an inverter with the function of participating in the system low-frequency oscillation suppression of the present invention, including a main circuit, a voltage and current measurement module, an inverter controller, a PWM signal generator, and a drive circuit. Combine below figure 1 , specifically introduce the structure and function of each part:
[0035] 1) The main circuit part, including DC terminal, three-phase full-bridge inverter circuit, LC filter and closing switch KM, etc. Among them, r f and L f is the equivalent resistance and inductance on the inductor in the LC filter, and the subscript abc indicates three phases. The three-phase full-bridge inverter circuit includes 6 power electronic devices, which are turned on or off under the action of the drive circuit to realize the function of converting direct current into alternating current.
[0036...
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The invention discloses an inverter controller with a function of participating in system low-frequency oscillation suppression. The inverter controller comprises a dq transformation unit, an inverteroutput power and terminal voltage calculation unit, a reactive voltage unit, an active frequency unit for simulating a synchronous generator, a virtual rotational inertia adaptive adjustment unit, avirtual damping coefficient adaptive adjustment unit and a dq inverse transformation and pulse width modulation unit. The inverter controller simulates a rotation equation of the synchronous generatorand adaptively changes the virtual rotational inertia and the damping coefficient according to the magnitude and sign of the differential of the virtual angular frequency and the inverter output power, thereby being conducive to suppressing the low-frequency oscillation of the system, and improving the stability of the power system. According to the inverter controller, the self-adaptive adjustment of the virtual damping coefficient is fully considered to adapt to the operation control of an inverter in an easy-to-oscillate environment.
Description
technical field [0001] The invention relates to a power electronic inverter, in particular to an inverter controller with the function of suppressing low-frequency oscillation participating in the system. Background technique [0002] In view of the pressure of energy, environmental protection and power supply reliability, distributed generation (DG: Distributed Generation) and renewable energy power generation technology have become research hotspots in the field of power. As a DC to AC power conversion device, the power electronic inverter has been widely used in photovoltaic, wind power, energy storage and other fields. However, compared with the traditional synchronous generator, although the inverter has the advantages of simple structure, flexible control, low cost and convenient use, it also has disadvantages such as poor overload capacity, fast response speed and almost no inertia. The traditional synchronous generator itself has a certain moment of inertia, and thi...
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IPC IPC(8): H02J3/24H02M7/537
CPCH02J3/24H02M7/537
Inventor 叶圣永张玉鸿刘旭娜张文涛魏俊韩宇奇龙川刘洁颖陈博王司琪
Owner STATE GRID SICHUAN ECONOMIC RES INST