A control method for photovoltaic participation in frequency regulation of isolated power grid
A technology of isolated power grid and control method, applied in photovoltaic power generation, single grid parallel feeding arrangement, reducing/preventing power oscillation, etc. problem, to achieve the effect of improving frequency stability and making up for system unbalanced power shortage
Active Publication Date: 2018-03-02
WUHAN UNIV +1
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Problems solved by technology
[0004] When the system is disturbed by power, the priority of the stabilizing device is the highest. However, due to the single load difference in the aluminum plant, low-frequency load shedding cannot completely stabilize the power disturbance, resulting in unbalanced power in the isolated power grid after the stabilizing action
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Embodiment
[0079] Photovoltaic participation in the effectiveness verification of the isolated grid frequency control method.
[0080] Scenario: A large-capacity generator suddenly trips.
[0081] RTDS simulation is carried out on an isolated power grid to investigate the effect of photovoltaic power generation system participating in frequency regulation when the frequency regulation capability of the isolated power grid is insufficient. The models and parameters of generators, transformers, transmission lines, excitation, governors and other original components in the RTDS model are all field actual investigation parameters. According to the actual operation situation on site, the upper limit of primary frequency regulation of each thermal power unit is 10% of its rated active power.
[0082] Table 1 shows the simulation operating conditions of photovoltaic operation in MPPT mode. Before the fault occurs, the active power output, hot standby and active power adjustment capacity of ea...
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The invention discloses a control method for photovoltaic participated isolated grid frequency modulation. The control method includes the steps that firstly, the total reserve capacity of an isolated grid system is obtained according to actually-measured load flow information of a wide area measurement system; secondly, whether the formula shown in the specification is met or not is judged, and when the formula is met, the third step is executed; thirdly, photovoltaic load shedding is executed; fourthly, the frequency feedback gain parameter (shown in the specification) of a photovoltaic power generation system is introduced to frequency droop control, and isolated grid frequency modulation control is conducted. The photovoltaic power generation system can participate in the isolated grid system for frequency modulation, and the frequency stability under isolated grid power disturbance is improved.
Description
technical field [0001] The invention belongs to the technical field of isolated power grid frequency modulation control, and in particular relates to a control method for photovoltaics to participate in isolated power grid frequency modulation. Background technique [0002] my country's energy centers and load centers present a serious reverse distribution. The traditional solution is through UHV and EHV long-distance transmission, but relying on high-energy-consuming industries to consume renewable energy locally in the power center is also an extremely effective solution. Due to geographical barriers, and in order to avoid high backup costs and realize its industrial economic benefits, some power systems need to operate in isolation, figure 1 It is the structure diagram of the isolated grid system. For isolated grids with high penetration of wind power in high-energy-consuming industries like electrolytic aluminum loads, the load level difference is single, and conventio...
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IPC IPC(8): H02J3/46H02J3/24
CPCY02E10/56
Inventor 徐箭廖思阳孙元章李晓民谷俊和董建勋鲍益屈尹鹏周密
Owner WUHAN UNIV