Control method for time-varying damping characteristics of voltage-sensitive industrial loads in isolated power grids
A technology of industrial load, isolated power grid, applied in the direction of single grid parallel feeding arrangement, single AC network with different frequencies, reducing/preventing power oscillation, etc. Damping characteristic control, the effect of maintaining frequency stability
Active Publication Date: 2016-06-29
WUHAN UNIV +1
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Problems solved by technology
The damping coefficient of the traditional electrolytic aluminum load is often considered to be a fixed value and equal to zero, but if the change of the system frequency can cause the change of the system voltage and load, the damping coefficient of the spot aluminum load will not be zero
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[0051] The invention reduces the maximum frequency deviation after the system disturbance by changing the damping coefficient of the voltage sensitive load, thereby improving the frequency stability of the isolated grid. The present invention is based on a closed-loop control excitation system that can realize frequency-voltage coordinated control and introduces frequency deviation feedback. Aiming at the characteristics of insufficient active power adjustment capability of the isolated power grid and the special load characteristics of rectified loads, the DC electrolytic aluminum load without conventional primary frequency modulation characteristics will be reduced. The value that the damping factor is considered non-zero and can change online. The WAMS system detects and calculates the primary frequency modulation capability after a system fault on-line, and obtains the value of the feedback gain parameter in the voltage closed-loop control, thereby controlling the real-time...
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The invention discloses a time-varying damping characteristic control method for voltage-sensitive industrial loads in an isolated power grid. When system power disturbance is larger than the primary frequency modulation capacity of a power generator set, the control method is started. The method includes the steps that first, steady-state frequency offset and a steady-state load damping coefficient are acquired; second, a transient-state load damping coefficient and the time moment corresponding to maximum frequency offset under the transient-state load damping coefficient are acquired; third, a voltage sensitivity coefficient between load nodes and power generator nodes is acquired; fourth, according to the steady-state load damping efficient, the transient-state load damping coefficient and the voltage sensitivity coefficient, gain parameters corresponding to the steady-state load damping efficient and the transient-state load damping coefficient are calculated; fifth, a parameter K, fed back by pull-in frequency deviation, in a closed loop control excitation system is set as the gain parameters. According to the control method, the frequency response characteristics of the system are changed by changing the damping coefficients of electrolytic aluminum loads, and therefore frequency stability under isolated power grid power disturbance can be improved.
Description
technical field [0001] The invention belongs to the technical field of load damping characteristic control, in particular to a control method for the time-varying damping characteristic of voltage-sensitive industrial loads in an isolated power grid. Background technique [0002] The traditional large power grid has many thermal power units. When subjected to power disturbances, due to the large moment of inertia of the system and the large number of generating units, the system can respond to power disturbances through traditional primary and secondary frequency modulation to maintain the system frequency and voltage within the allowable range of fluctuations. . In addition, there are many load levels in large power grids, so loads with appropriate capacity can be selected for rapid shedding, thereby quickly eliminating unbalanced power. However, for high-energy-consuming industries like electrolytic aluminum loads, due to the single load structure level difference, the lo...
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IPC IPC(8): H02J3/02
CPCH02J3/24H02J3/46
Inventor 徐箭廖思阳周密孙元章鲍益屈尹鹏李晓民谷俊和董建勋
Owner WUHAN UNIV