A photovoltaic power station power coordinated distribution method for supporting global voltage control of distribution network
A technology for coordinated power distribution and photovoltaic power plants, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the problems of complex reactive voltage control, frequent output of distributed power sources, maintaining a reasonable voltage level of the distribution network, etc., to achieve Guaranteeing the effect of electricity sales revenue
Active Publication Date: 2018-12-14
JIANGSU ELECTRIC POWER CO +1
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Problems solved by technology
[0004] At the same time, compared with load changes, distributed power output changes more frequently, and the problem of reactive power and voltage control of active distribution networks connected to high-penetration distributed power becomes more complicated. If only traditional reactive voltage control equipment is used to adjust The capacity is still far from meeting the need to maintain a reasonable voltage level of the distribution network, so it will be of great significance to fully tap the regulation capacity of distributed power sources, especially the fastest-growing distributed photovoltaic power plants.
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[0037] The present invention as Figure 1-3 shown, including the following steps:
[0038] Step 1: The EMS of the photovoltaic power station obtains the reactive power adjustment command Q issued by the global voltage control system of the distribution network r_total and operating information of photovoltaic power plants;
[0039] Step 2: According to the obtained control instructions and the operation information of the photovoltaic power station, and according to the power circle diagram, determine the reactive power adjustment economic cost of each inverter, and select and distribute the reactive power adjustment amount and Active power regulation;
[0040] Power circle diagram: the square root of the sum of the maximum reactive power and active power that can be output by the inverter is fixed (Pythagorean law), and the power circle diagram can be drawn according to this characteristic, as shown in figure 2 shown.
[0041] Step 3: Calculate and distribute the active-...
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A photovoltaic power station power coordinated distribution method for supporting global voltage control of a distribution network. The invention relates to the field of photovoltaic power control, inparticular to a photovoltaic power station power coordinated distribution method for supporting global voltage control of a distribution network. The photovoltaic power station power coordinated distribution method for supporting global voltage control of the distribution network is provided, which considers the economic cost of reactive power regulation of the photovoltaic power station, the conversion relationship between reactive power and active power regulation ability is analyzed based on power circle, and the coordinated distribution of power is carried out in response to the global control command of distribution network voltage, so as to realize the global voltage control of the distribution network. The invention fully considers the operation state of each inverter, introduces the economic cost of power regulation of the photovoltaic power station, coordinates the distribution of reactive power and active power of the power station with the minimum cost, responds to the reactive power instruction issued by the global voltage control system, and ensures the power sales income of the photovoltaic power station to the maximum extent.
Description
technical field [0001] The invention relates to the field of photovoltaic power station power control, in particular to a photovoltaic power station power coordinated distribution method supporting global voltage control of a distribution network. Background technique [0002] In order to adapt to the access of high penetration rate and large-scale distributed power, the active distribution network technology with certain adjustment ability has emerged as the times require. The active distribution network is a distribution network with internal distributed energy, flexible adjustment of topology, and active control and operation capabilities. Specifically, through the combination of advanced information communication, power electronics and intelligent control technologies, the active distribution network makes the distributed power supply in the distribution network controllable, the network topology can be flexibly adjusted, and it has relatively complete observability and ...
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IPC IPC(8): H02J3/48H02J3/50H02J3/38
CPCH02J3/383H02J3/48H02J3/50Y02E10/56
Inventor 李培陶琼王树刚王德顺吴敏秀卢俊峰王靓孙博缪凯赵上林王升波叶季蕾李培培薛金花
Owner JIANGSU ELECTRIC POWER CO