New energy reactive power support analysis method based on extra-high voltage alternating-current and direct-current power grid

Abstract

The invention relates to a new energy reactive power support analysis method based on an extra-high voltage alternating-current and direct-current (AC / DC) power grid, and the method comprises the following steps of: acquiring a topological structure of the extra-high voltage AC / DC power grid, and determining power nodes of the topological structure; determining the new energy type of the power nodes, wherein the new energy type comprises double-fed wind motor power generation, direct-driven wind motor power generation and photovoltaic power generation; calculating the maximum value and the minimum value of the adjustable reactive power of each new energy, and determining the voltage change value delta V of a power node bus when the adjustable reactive power of the new energy changes from the minimum value to the maximum value according to a load flow calculation model; calculating reactive voltage sensitivity delta of the new energy; sorting the reactive voltage sensitivity delta of each new energy of all the power nodes from large to small, and carrying out reactive adjustment on the extra-high voltage alternating-current and direct-current power grid according to the determined reactive voltage sensitivity delta sorting sequence; the reactive power requirement of the whole extra-high voltage direct current power grid can be met, and the stability of the whole power grid can be ensured.

Description

technical field [0001] The invention relates to an electric power analysis method, in particular to a new energy reactive power support analysis method based on an ultra-high voltage AC / DC power grid. Background technique [0002] With the rapid development of new energy sources, UHV receiving end areas are often connected to a large number of new energy sources, which further reduces the number of operating synchronous machines and dynamic reactive power sources. Generally new energy power plants are equipped with a certain number of dynamic reactive power compensation equipment, with the goal of controlling the voltage or power factor of the grid-connected point [3] , and will not send too much reactive power to the grid for voltage support, because the attached figure 2 Shown: The curve of active power and reactive power, if the output of reactive power is more, the output of active power will be less, which will have a serious impact on the active power in the power sup...

AI Technical Summary

Problems solved by technology

Generally new energy power plants are equipped with a certain number of dynamic reactive power compensation equipment, with the goal of controlling the voltage or power factor of the grid-connected point [3] , and will not send too much reactive power to the grid for voltage support, because the attached figure 2 Shown: The curves of active power and reactive power, if more reactive power is output, then the active power output will be less, which will have a serious impact on the active power in the power supply

[0003] As mentioned above, in the UHV AC / DC grid, reactive power is needed to support the grid voltage and power factor. However, if too many power nodes are put into reactive power regulation, it will seriously affect the power output of the entire grid. , however, if the reactive power adjustment is insufficient to meet the needs of the grid, it will seriously affect the stability of the entire grid. Therefore, how to dispatch and adjust the reactive power support of the UHV AC / DC grid has become a technical problem of

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