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Reactive power coordinated control algorithm for distributed photovoltaics of distribution network based on eleven-lattice graph

A distributed photovoltaic and coordinated control technology, applied in reactive power compensation, AC network voltage adjustment, etc., can solve grid voltage stability problems, grid voltage fluctuations, increase the difficulty of grid voltage adjustment, etc., and achieve accurate control effects Effect

Active Publication Date: 2015-11-25
STATE GRID CORP OF CHINA +3
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Problems solved by technology

[0003] However, with the large-scale development of photovoltaic power generation, there will be problems with grid voltage stability
The randomness of photovoltaic power generation may cause the voltage in the grid to fluctuate from time to time, and even cause the line voltage to exceed the limit
In addition, since the inverters at the same grid-connected point have the same influence on the illumination change, the voltage will fluctuate intensified, which may cause frequent actions of the voltage / reactive power adjustment device. When the proportion of photovoltaic power generation in the grid power supply continues to increase, its impact on grid voltage regulation will become more significant, increasing the difficulty of voltage adjustment during normal operation of the grid.

Method used

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  • Reactive power coordinated control algorithm for distributed photovoltaics of distribution network based on eleven-lattice graph
  • Reactive power coordinated control algorithm for distributed photovoltaics of distribution network based on eleven-lattice graph
  • Reactive power coordinated control algorithm for distributed photovoltaics of distribution network based on eleven-lattice graph

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Embodiment Construction

[0018] Such as figure 1 As shown, the present invention provides a distribution network distributed photovoltaic reactive power coordination control algorithm based on the eleventh diagram, including: 1) using the selection control strategy of the eleventh diagram, taking the grid-connected point voltage and power factor as the comprehensive Criterion to select the adjustment method of reactive power control; 2) Use the equal ratio method to make each adjustable photovoltaic power generation unit have the same reactive power adjustment margin, and each photovoltaic power generation unit is within the upper and lower limits of reactive power according to the offset The same principle is used for distribution; 3) The equal power factor method is used to make each adjustable photovoltaic power generation unit have the same power factor, and the target total reactive power of the whole station is calculated according to the target command after excluding the non-adjustable photovol...

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Abstract

The invention relates to a reactive power coordinated control algorithm for distributed photovoltaics of a distribution network based on an eleven-lattice graph. The algorithm comprises the following steps: (1) selecting a reactive power control adjusting method by adopting a selection control strategy of the eleven-lattice graph and using grid-connected point voltage and power factor as synthetic criteria; (2) enabling each adjustable photovoltaic power generation unit to have the same reactive power adjusting margin by adopting an equal proportion method, and distributing each photovoltaic power generation unit within the upper and lower limit range of reactive power according to the principle of identical offset; and (3) enabling each adjustable photovoltaic power generation unit to have the same power factor by adopting an equal power factor method, excluding nonadjustable photovoltaic power generation units and then calculating the total reactive power of a full station target according to a target instruction. The reactive power coordinated control algorithm for the distributed photovoltaics of the distribution network based on the eleven-lattice graph realizes coordinated control of the distributed photovoltaics, and ensures that the distribution network runs under normal and reasonable voltage.

Description

technical field [0001] The invention belongs to a method in the field of reactive power control of electric power systems, and specifically relates to a distributed photovoltaic reactive power coordination control algorithm of a power distribution network based on an eleven-square diagram. Background technique [0002] With the continuous increase in the demand for grid-connected photovoltaic systems in my country, the incentives for various national energy structure adjustments have continued to increase, and the grid-connected photovoltaic capacity in my country has grown rapidly. As of the end of 2014, the cumulative installed capacity of photovoltaic power generation was 28GW, and the newly installed capacity in 2014 was 10.6 million kilowatts, accounting for about 20% of the world's newly installed capacity. The "Twelfth Five-Year Plan for Solar Power Generation Development" pointed out that by the end of 2015, my country's installed solar power generation capacity will...

Claims

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Application Information

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IPC IPC(8): H02J3/16
CPCY02E40/30
Inventor 袁晓冬朱卫平王文帝徐青山孙健戴强晟陈兵贾萌萌李强史明明柳丹罗珊珊吕振华
Owner STATE GRID CORP OF CHINA
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