Generator set coordination control device and method based on regional power grid stability control system

A technology of generator set and stability control system, which is applied in the direction of single-network parallel feeding arrangement, reduction/prevention of power oscillation, etc. It can solve the problems of frequent power grid accidents, weak anti-accident ability, and low reserve capacity, and achieves wide application prospects , Reliable design principle and simple structure

CN111668880APending Publication Date: 2020-09-15LIAOCHENG XINYUAN GRP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-09-15

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Abstract

The invention provides a generator set coordination control device and method based on regional power grid stability control, and the device comprises the steps: additionally arranging a stability control unit execution station at a stability control substation of a stability control system, and enabling the stability control unit execution station to be connected with a generator set; and the stability control unit execution station being connected with a unit speed regulation system. When a power grid accident occurs, the stability control system issues a rapid load adjustment command to theunit speed regulation system, and the optimized unit rapid primary frequency modulation capability is combined to rapidly adjust the load of the generator so as to maintain the stability of the powergrid frequency. And the problems of power grid frequency oscillation and even power grid collapse caused by the fact that the stability control system directly acts to cut off the high-capacity unitafter an accident occurs in the regional power grid are avoided.
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Description

technical field

[0001] The invention belongs to the technical field of regional power grids, and in particular relates to a generator set coordination control device and method based on a regional power grid stability control system. Background technique

[0002] With the rapid development of industry, the power consumption of enterprise power grid has increased sharply, and the enterprise regional power grid has gradually developed. Regional units have the advantages of high power generation efficiency, low power production and operation costs, no external power grid constraints, and external faults do not affect power supply safety. More and more regional power grids are not connected to external power grids to improve economic benefits, and the scale of a single regional power grid At the same time, isolated power grids often have the characteristics of "big machines, large loads and small grids". The relatively small number of units and low reserve capacity lead to poor...

Examples

Embodiment 1

[0037] Existing control systems such as figure 1 As shown, the power grid stability control main station ① to the stability control sub-station ②, the stability control sub-station ② to the stability control execution station ④, and the load field execution station ⑧ of the power grid stability control system are all connected through the optical cable communication equipment between stability control stations ②. The executive station of the power plant with stable control ④ is connected with the frequency and voltage control device of the power grid (the third line of defense of the power grid) ⑤ through the hard wiring of the secondary cable and the protection device of the generator-transformer unit ⑥.

[0038] This embodiment provides a coordinated control device for generating sets based on a regional power grid stability control system, which specifically includes the following features:

[0039] In the existing stability control system, a stability control unit executio...

Embodiment 2

[0041] There is a certain time delay for the first frequency regulation of the unit itself. Even after the first frequency regulation of the unit is optimized, in the case of no stability control cooperation, in a frequency regulation test, the actual frequency regulation load reaches the following response index: frequency regulation response time is 2 seconds, and the time to reach 90% of the theoretical frequency modulation is 6 seconds. That is to say, the primary frequency regulation capability of the unit cannot be brought into play in a short period of time in the event of an accident. Therefore, after the power grid has a load loss that is less than the next frequency regulation capacity of the power grid unit, it is still necessary to take measures to ensure the stability of the power grid frequency by taking measures to ensure the stability of the power grid frequency, and cannot completely rely on the frequency regulation of the unit. The machine-network coordinatio...