Method for optimizing torsional vibration suppression effect and additional damping controller
An additional damping and controller technology, applied in the direction of reducing/preventing power oscillations, can solve problems affecting the normal operation of the unit, affecting
Active Publication Date: 2021-04-16
NR ELECTRIC CO LTD +1
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Problems solved by technology
However, if the additional damping control has been maintained at a high level of output, it will have an impact on the control of the torsional vibration suppression actuator, and a small speed change may also generate a large additional signal, thereby affecting the normal operation of the unit
Method used
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Embodiment Construction
[0054] In order to clearly illustrate the method of the present invention, the specific implementation manner of the present invention is illustrated in conjunction with the accompanying drawings.
[0055] Such as figure 1 Shown is a schematic diagram of the basic structure of the unit using an additional damping controller, which is mainly composed of a speed measuring device, an additional damping controller, an electrical quantity monitoring device at the machine end, and an oscillation suppression execution device; where ω is the speed of the unit measured by the speed measuring device.
[0056] figure 2 Shown is a method for optimizing the torsional vibration suppression effect provided by Embodiment 1 of the present application, including the following steps:
[0057] S1: The unit terminal electric quantity monitoring device monitors the unit terminal voltage V in real time t , current I t , the rotational speed deviation signal is obtained from the rotational speed ...
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The invention discloses a method for optimizing a torsional vibration suppression effect. The method comprises the steps that t a voltage and current signal of a machine end of a unit is measured and he operation state of a system is judged according to the measured signal; under the condition of large disturbance of the system, a disturbance type is judged, and an instruction is sent to an additional damping controller, so the gain of the additional damping controller is dynamically adjusted; and a control signal of additional damping is subjected to filtering and phase shifting links and multiplied by floating gain to serve as an output signal of the controller, so the function of additional damping control is achieved. According to the method, the gain of an additional damper can be dynamically adjusted, additional damping control is reasonably utilized at different stages of system disturbance, suppression is enhanced as much as possible at the initial stage of disturbance, and oscillation caused by unreasonable gain is avoided at the final stage of disturbance; and the method is simple, convenient and easy to implement.
Description
technical field [0001] The invention belongs to the technical field of electric power system control, and in particular relates to the additional damping control of a unit with a rotating shaft system. Background technique [0002] Subsynchronous oscillation (SSO) is a phenomenon in which a unit exchanges energy with the grid at one or more natural frequencies. The unit with SSO phenomenon may be a thermal power unit, or a hydroelectric unit or a wind turbine. Series compensation lines in the power grid, high-voltage direct current transmission, and new power electronic equipment may all have subsynchronous oscillations with the unit. [0003] Sub-synchronous oscillation is extremely harmful to the shafting of the unit. Taking the thermal power unit as an example, during the oscillation period, the mechanical part of the thermal power unit and the electrical part of the system will undergo energy conversion and oscillation, which not only causes the oscillation of the electr...
Claims
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IPC IPC(8): H02J3/24
Inventor 马志恒王凯张琦雪吴小丹王辉施一峰王建安王新宝王光
Owner NR ELECTRIC CO LTD