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Reactive power optimization method for photovoltaic reactive power partition pricing power distribution network

An optimization method and distribution network technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problem of unreasonable consideration of reactive power costs, failure to meet user reactive power requirements and system voltage stability requirements, and hardware resource utilization to be improved And other issues

Active Publication Date: 2020-01-14
HOHAI UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to aim at the aspect of reactive power optimization of the distribution network after the controllable photovoltaic is connected to the distribution network in the existing method, and the reactive power output capability of the photovoltaic inverter is used for active-reactive joint optimization without reasonable consideration. and the current reactive power control cannot meet the user's reactive power demand and system voltage stability requirements, and the utilization rate of hardware resources needs to be improved. A reactive power optimization method for distribution network with photovoltaic reactive power partition pricing is proposed.

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  • Reactive power optimization method for photovoltaic reactive power partition pricing power distribution network
  • Reactive power optimization method for photovoltaic reactive power partition pricing power distribution network
  • Reactive power optimization method for photovoltaic reactive power partition pricing power distribution network

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Embodiment

[0171] Example: The correctness of the reactive power compensation optimization model and method is verified by using the improved 10kV power distribution network structure based on IEEE33 nodes. The load after improvement is 3 720+j2 300kVA, the average load value of each node changes according to the daily load forecast curve and the power factor of each node remains unchanged. The reference capacity is 10MVA, the head-end voltage is 12.66kV, and the corresponding unit value is 1.05p.u. The on-load voltage regulating device OLTC installed between nodes 1 and 2 has five gears, namely [0, 1±2.5% , 1±5%], the maximum number of daily adjustments is 4 times. According to the voltage deviation rate of the distribution network safety operation standard is 7%, the upper and lower limits of the voltage are set as ±5% of the rated value in this paper, and the maximum value of the branch current is taken as 0.5kA. 800kWp distributed photovoltaics are respectively connected to end node...

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Abstract

The invention discloses a reactive power optimization method for a photovoltaic reactive power partition pricing power distribution network, and the method comprises the steps: proposing a controllable photovoltaic reactive power partition pricing model, taking the minimum reactive comprehensive cost and the minimum deviation between active power loss and voltage as optimization targets, and constructing a power distribution network active-reactive power optimization model including response PV inverter reactive partition electricity price, static Var compensator (SVC) dynamic compensation, on-load voltage regulation equipment OLTC tap and capacitor bank switching; and processing nonlinear terms in the model by adopting mathematical means such as second-order cone programming and a large Mmethod, finally obtaining a mixed integer second-order cone programming model of active-reactive coordination optimization of the power distribution network containing controllable photovoltaic in the power market environment, and segmenting and solving the model by adopting a Benders decomposition method. According to the invention, the reactive capacity of a photovoltaic inverter and the reactive support capability of original discrete equipment of a distribution network are reasonably and coordinately utilized, the active power loss is reduced, and the user voltage quality is ensured.

Description

technical field [0001] The invention belongs to the field of reactive power optimization of a distribution network including photovoltaic power stations, and in particular relates to a reactive power optimization method of a distribution network with photovoltaic reactive power partition pricing. Background technique [0002] The active and reactive power of the photovoltaic inverter is decoupled and controlled, so that the inverter can dynamically send / absorb reactive power according to the grid demand and then adjust the voltage. However, continuous operation under this strategy will cause the inverter to overheat and increase the leakage current. It is not conducive to the stable operation of the grid-connected system. Using the Optimal Inverter Dispatch (OID) strategy can reduce the amount of abandoned light and improve system stability, but the lack of a detailed reactive power partition control strategy in operation is not conducive to the active development of the rea...

Claims

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Application Information

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IPC IPC(8): H02J3/50H02J3/38
CPCH02J3/50
Inventor 黄帅飞周玲崔建双
Owner HOHAI UNIV
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