State estimation method for offshore oilfield group power grid
An offshore oilfield group and state estimation technology, which is applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as large influence of system state, split operation, and inability to operate the system
Active Publication Date: 2014-11-05
CHINA NAT OFFSHORE OIL CORP +1
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3. The generator sets in the oilfield power grid are all gas turbines. Due to the small inertia of gas turbines, starting or shutting down has a great impact on the system state, so it is not suitable to use the sudden change detection of quantity measurement to find the error information in the measurement
4. Different oil production platforms in the oilfield power grid are connected by a submarine cable, which is prone to split operation, which makes the traditional state estimation program unable to estimate the operating state of the system normally
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[0033] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0034] Such as figure 1 As shown, the present invention provides a method for state estimation of an offshore oilfield group power grid, which includes the following steps:
[0035]1) Initialization: Obtain the network parameters of the offshore oilfield group power grid system from the existing energy management system (EMS). Impedance, and input these network parameters into the common information model (CIM model) of the existing offshore oilfield group grid.
[0036] 2) Read measurement data from SCADA (Data Acquisition and Supervisory Control System) in EMS, measurement data includes telemetry and telesignal measurement; telemetry mainly includes voltage amplitude measurement, generator active power Measurement, generator reactive power measurement, load active power measurement, load reactive power measurement, line head end active power measu...
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The invention relates to a state estimation method for an offshore oilfield group power grid. The method includes the following steps: network parameters of an offshore oilfield group power grid system are acquired from an energy management system (EMS) and input into a public information model; measurement data is read from a supervisory control and data acquisition (SCADA) system of the EMS, and the measurement data comprises remote measuring measurement and remote signaling measurement; weight of the measurement data is assigned to be 1; nodal injection current is introduced to be used as a state variable, relay protection measurement is introduced to be used as a measurement quantity, and the state variable is initialized; each oilfield platform power grid is used as an area, and a state variable of the initialized state variable is solved; if the maximum measurement residual is smaller than a threshold value 1, and then a state estimation result is stored and output; if the maximum measurement residual is larger than the threshold value 1, then the data with the maximum residual is marked as bad data, if a bad data proportion is smaller than a threshold value 2, the state variable is initialized again, partitioned sate estimation is carried out again, and if the bad data proportion is larger than the threshold value 2, alarm is given, and sampling is carried out again; the measurement residual for the threshold value 1 is 3%; and the measurement residual for the threshold value 2 is set to be 10%. The state estimation method for the offshore oilfield group power grid can be applied to the EMS of the oilfield group power grid.
Description
technical field [0001] The invention relates to a method for estimating the state of a power grid, in particular to a method for estimating the state of an offshore oilfield group power grid in the field of offshore oil and gas production and power grid systems. Background technique [0002] Offshore oilfield group power grid is an independent micro-grid system scattered on the ocean, consisting of distributed power generation, platform substations / loads, submarine cables, etc. It is an important infrastructure for offshore oil and gas exploitation. Sex and efficiency play an important role. The energy management system (EMS) is one of the key technologies to protect the power grid of offshore oilfields and plays a very important role. So far there is no state estimation of the offshore oilfield group power grid, and the state estimation of the offshore oilfield group power grid is one of the core functions of the offshore oilfield group power grid EMS. Its function is to e...
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IPC IPC(8): H02J3/00
Inventor 王建丰谢小荣魏澈孙英云刘国锋李强李浩田
Owner CHINA NAT OFFSHORE OIL CORP