A voltage regulation method for distribution network considering source-load coordination

Abstract

The invention relates to a voltage control method for distribution network considering source-load coordination. The method calculating voltages of each node in distribution network, and directly outputting and ending the voltage regulation if the voltages of each node are within a prescribed range, Otherwise, determining whether the voltage exceeds the upper limit or not, and if the voltage valueexceeds the prescribed upper limit value at this time, carrying out the voltage control by using the source-charge coordinated voltage control model of a photovoltaic, an electric vehicle and an on-load tap changer; Otherwise, inducing the capacitor in the control measures to exceed the lower limit value, and the voltage control model including photovoltaic, electric vehicle, on-load tap changerand capacitor will be used to control the voltage. The optimal solution of the voltage regulation model of source-charge coordination is used to regulate the voltage. Combined with the interaction among load side, power side and grid side, considering the uncertainty condition and demand side response characteristics, it solves the problem of distribution network voltage exceeding limit under different meteorological factors considering photovoltaic grid-connected.

Description

technical field [0001] The invention relates to the technical field of voltage control of power system distribution network, in particular to a distribution network voltage control method considering source-load coordination. Background technique [0002] In the traditional distribution network voltage, the uncertain factors affecting the voltage level are mostly load fluctuations, while in the voltage control of the distribution network containing distributed generation (DG), since the output power of distributed generation units is affected by weather and region Due to natural influence, the uncertain factors in the distribution network increase. At the same time, in the voltage control of the distribution network containing DG, the voltage of each bus is the object of voltage control. If the capacity of the connected DG is too large and the distribution points are too large, the phenomenon of power reverse will occur, resulting in the voltage of the distribution network b...

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Problems solved by technology

[0004] For the distribution network voltage control method containing photovoltaic power sources, the reduction of photovoltaic active power is not conducive to ensuring energy utilization; the cost of adding energy storage and reactive power compensation devices is high, and in the environment where a large number of distributed power sources are connected, economical problems Further consideration is needed; the method of regulating voltage only through the reactive power adjustment capability of the photovoltaic inverter is limited by its active power output and inverter capacity, and lacks overall planning for the situation where the voltage exceeds the lower limit; considering the distribution network voltage of the demand side response The regulation can not only reduce the load, but also need to balance the relationship between economic benefits, voltage quality improvement and loss, and cost in combination with DG

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