Steam turbine control method and system suitable for three-phase reclosing
A control method and technology for steam turbines, applied in control systems, control generators, mechanical equipment, etc., can solve problems such as the lack of steam turbine control systems, and achieve the effect of improving success
Pending Publication Date: 2021-06-25
HUANENG NANTONG GAS TURBINE POWER GENERATION CO LTD
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Problems solved by technology
[0005] Three-phase reclosing needs to meet certain conditions, but the current steam turbine control system does not have these functions, and it needs to be modified accordingly
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[0027] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0028] A kind of steam turbine control method suitable for three-phase reclosing of the present invention, see figure 1 shown, including the following steps:
[0029] Step S1, determining the parameters of the PID link in the thermal control system so as to meet the adjustment speed and adjustment accuracy required by the three-phase reclosing.
[0030] The speed regulation of the steam turbine is the key to the smooth reconnection of the generator. If the speed regulation is too slow, in extreme cases, the frequency of the generator will not be able to track the system frequency, resulting in grid connection failure; if the speed regulation is too fast, the speed regulation If the system damp...
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The invention discloses a steam turbine control method suitable for three-phase reclosing. The method comprises the following steps of: determining parameters of a PID link in a thermal control system so as to enable the parameters to meet regulation speed and regulation precision requirements of the three-phase reclosing; in response to a three-phase reclosing request, acquiring a current power grid frequency and a generator frequency, and comparing the power grid frequency with the generator frequency to determine the speed regulation direction of acceleration or deceleration of a steam turbine; and converting the power grid frequency and the generator frequency into rotating speeds, inputting the rotating speeds serving as given values into the PID link in the thermal control system, acquiring the active power of a generator as a feedback value of the PID link, calculating the adjusting power of the steam turbine obtained in the PID link, and adjusting the rotating speed of the steam turbine based on the speed adjusting direction and the adjusting power so as to allow the rotating speed of the steam turbine to be be matched with the rotating speed of a power grid. The power grid frequency and the generator frequency are collected in real time to calculate the speed regulation direction and the regulation quantity of the steam turbine, so the rotating speed of the steam turbine is matched with the rotating speed of the power grid, and the success rate of the three-phase reclosing is improved.
Description
technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a steam turbine control method suitable for three-phase reclosing, and also relates to a steam turbine control system suitable for three-phase reclosing. Background technique [0002] In ultra-high voltage transmission lines, most of the short-circuit faults are instantaneous faults, so reclosing is widely used with a high success rate, which improves the overall reliability of the power system. The generator out-of-step fault of the turbogenerator is essentially the destruction of the stability of the power system, rather than the permanent failure of the generator itself. When the power grid due to insufficient active power causes the unit to oscillate out of step and trip, it will undoubtedly lead to a greater shortage of active power, resulting in a wider range of instability in the system, leading to a large-scale power outage within the entire net...
Claims
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IPC IPC(8): H02J3/42F01D21/00H02P9/04H02P101/20
CPCH02J3/42F01D21/00H02P9/04H02P2101/20
Inventor 钱煜陈蔡辉王信海薛晓丹陈育森张伟伟徐静李辉殷海峰徐璐吴灵华陈晓霞
Owner HUANENG NANTONG GAS TURBINE POWER GENERATION CO LTD