Automatic quasi-synchronization grid connection method and system suitable for offshore interconnected power system
An automatic quasi-synchronization, power system technology, applied in the field of power systems, can solve the problems of long quasi-synchronization period, high technical level requirements, quasi-synchronization closing failure, etc., to achieve the effect of reducing workload
Active Publication Date: 2020-10-16
CHINA NAT OFFSHORE OIL CORP +2
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Problems solved by technology
Method (1) There are potential safety hazards such as misoperation in manual synchronization
Methods (2) and (3) have high requirements on the technical level of the operators. During the automatic synchronization process, the synchronization device does not adjust the frequency and voltage of the unit or only the unit of one platform. The entire period of the synchronization is long and there are Risk of quasi-synchronous closing failure
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[0023] The invention provides an automatic quasi-synchronous grid connection method suitable for offshore interconnected power systems. According to the voltage difference, frequency difference, and phase angle measurement values on both sides of the synchronous switch of the two platforms, the method realizes the synchronization of the two platforms of the offshore power system. The frequency and voltage of multiple units can be quickly adjusted. When the closing conditions are met, the automatic quasi-synchronous grid connection will be realized according to the set lead time. The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0024] The present invention specifically comprises the following steps:
[0025] S1. Collect the voltage on both sides of the synchronous switch between the two platforms, and calculate the frequency difference, phase difference and voltage difference of the voltage on both sides ...
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The invention relates to an automatic quasi-synchronization grid connection method and system suitable for an offshore interconnected power system, and the method comprises the steps: collecting the voltages at two sides of a synchronization switch between two platforms, and calculating the frequency difference, phase difference and voltage difference of the voltages at two sides of the synchronization switch in real time; according to the calculated frequency difference and the voltage difference value, automatically adjusting the frequency and the voltage of a plurality of units between thetwo platforms; and judging whether a switching-on condition is met or not, and when the switching-on condition is met, sending a switching-on instruction according to set leading time to realize automatic quasi-synchronization grid connection. The single function of the quasi-synchronization device of the offshore interconnected power system is improved, frequency and voltage adjustment is automatically carried out on the multiple units between the two platforms, the workload of operation and maintenance personnel is reduced, the automatic quasi-synchronization time is shortened, and the quasi-synchronization switching-on success rate of the offshore interconnected power system is increased.
Description
technical field [0001] The invention relates to the technical field of power systems, in particular to an automatic quasi-synchronous grid connection method and system suitable for offshore interconnected power systems. Background technique [0002] At this stage, offshore oil platforms have changed from the original single-platform power supply mode to multi-platform networked power supply mode, and they often encounter grid-connected operations at the same time. Compared with the large land power grid, the platforms on both sides of the quasi-synchronous switch are small isolated grid systems without a stable voltage reference, and the power system of each platform has poor anti-interference ability. Serious damage, even affecting the stable operation of the entire offshore platform power supply system. In order to ensure the smooth progress of grid-connected operations during the same period, the more common methods are: [0003] (1) The operator manually completes the ...
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IPC IPC(8): H02J3/08H02J3/40H02J13/00
CPCH02J3/08H02J3/40H02J13/00032Y02E40/70Y04S10/12
Inventor 倪群辉刘国锋万光芬侯炜魏澈石勇邱银锋赵健龙王栎涛高璇张丽娜李雪王凯藤张昊李强胡意茹车久玮
Owner CHINA NAT OFFSHORE OIL CORP