Control method for photovoltaic participated isolated grid frequency modulation
A technology of isolated power grid and control method, applied in photovoltaic power generation, single grid parallel feeding arrangement, reducing/preventing power oscillation, etc. problems, so as to make up for the system unbalanced power shortage and improve the frequency stability.
Active Publication Date: 2015-11-11
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 participates in the verification of the effectiveness of the frequency control method of isolated grids.
[0080] Scenario: A large-capacity generator set suddenly trips.
[0081] Perform RTDS simulation on an isolated power grid to investigate the effect of photovoltaic power generation systems participating in frequency modulation when the isolated power grid's frequency modulation capacity is insufficient. The original models and parameters of generators, transformers, transmission lines, excitation, and governors in the RTDS model are all actual field survey parameters. According to the actual operating conditions on site, the upper limit of the primary frequency adjustment 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 failure occurs, the active power output, hot standby, and active power adjustment capacity of each thermal power unit ...
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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 photovoltaic participation in isolated power grid frequency modulation. Background technique [0002] my country's energy centers and load centers show a serious reverse distribution. The traditional solution is to solve the problem through UHV and UHV long-distance transmission, and relying on high-energy-consuming industries to absorb renewable energy 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, certain power systems need to operate in isolation. figure 1 It is an isolated grid system structure diagram. For isolated grids with high-permeability wind power in high energy-consuming industries like electrolytic aluminum loads, the load level difference is single, and conventional sta...
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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