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Coordinated power control method for 10kv distribution network with photovoltaic power supply
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A photovoltaic power supply and coordinated control technology, applied in photovoltaic power generation, AC network voltage adjustment, reactive power compensation, etc. The effect of increasing the absorption capacity
Inactive Publication Date: 2017-07-21
CHINA SOUTHERN POWER GRID COMPANY +1
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[0007] In addition, the output of photovoltaic power sources varies greatly day and night, and the focus of reactive power regulation is different under different conditions.
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Embodiment 1
[0032] Such as figure 1 As shown, the flow chart of the power coordination control method of the 10kV distribution network containing photovoltaic power sources in this embodiment includes the following steps:
[0033] 1) Read the active output data of the photovoltaic power source from the control system;
[0034] 2) Judging whether the active power output is greater than 20% of the rated capacity of the inverter, if so, proceed to step 3), if not, proceed to step 4);
[0035] The judgment result of this calculation example is that the active output is less than 20% of the rated capacity of the inverter, and enter step 4).
[0036] 4) Determine whether the grid-connected point voltage of the photovoltaic power source is between 10kV and 10.4kV, if not, adjust the reactive power output of the photovoltaic power source to make the grid-connected point voltage between 10kV and 10.4kV, and if so, end this operation .
[0037] According to the control requirements of step 4), i...
Embodiment 2
[0042] Such as figure 1 As shown, the flow chart of the power coordination control method of the 10kV distribution network containing photovoltaic power sources in this embodiment includes the following steps:
[0043] 1) Read the active output data of the photovoltaic power source from the control system;
[0044] 2) Judging whether the active power output is greater than 20% of the rated capacity of the inverter, if so, proceed to step 3), if not, proceed to step 4);
[0045] The judgment result of this calculation example is that the active output exceeds 20% of the rated capacity of the inverter, and enter step 3).
[0046] 3) Determine whether the grid-connected point voltage of the photovoltaic power source exceeds the limit. If it exceeds the limit, adjust the reactive power output of the photovoltaic power source so that the grid-connected point voltage does not exceed the limit. If it does not exceed the limit, end this operation;
[0047] Through modeling and simul...
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Abstract
The invention discloses a 10kV power distribution network power coordination control method with a photovoltaic power supply. The method mainly comprises following steps of 1) reading and judging whether the active power output data of the photovoltaic power supply is 20% larger than the rated capacity of an inverter; 2) if the active power output data exceeds 20% of the rated capacity of the inverter, judging whether the integration pointvoltage of the photovoltaic power supply is out of limit, and allowing the integration pointvoltage to be not out of limit by adjusting the active power output of the photovoltaic power supply; and 3) if the active power output data does not exceed 20% of the rated capacity of the inverter, allowing the integration pointvoltage to be within 10kV-10.4kV by adjusting the active power output of the photovoltaic power supply. In this way, active adjusting ability of the photovoltaic power supply can be brought into full play and coordination control is performed on active power output according to the active power output and the integration point voltage, so objectives to improve voltage quality and increase access capacity of the photovoltaic power supply can be achieved.
Description
technical field [0001] The invention relates to a power control method of a 10kV power distribution line, in particular to an active / reactive power coordinated control method of a 0kV power distribution network containing a photovoltaic power source, and belongs to the technical field of distributed power supply control. Background technique [0002] In recent years, with the continuous development of distributed power and its grid-connected technology, distributed power is getting more and more attention and attention worldwide because of its more flexible, closer to the load side, and more environmentally friendly features. application. [0003] After the distributed power generation (DG for short) is connected to the distribution network, the structure of the distribution network has been completely changed, and the distribution network has changed from a single power source radial structure to a complex structure with power sources. The reactive voltage characteristics ...
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