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

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, hardware resource utilization to be improved, failure to meet user reactive power requirements and system voltage stability requirements And other issues

CN110690732BActive Publication Date: 2021-02-12HOHAI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-02-12

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Abstract

The invention discloses a distribution network reactive power optimization method for photovoltaic reactive power partition pricing, which includes proposing a controllable photovoltaic reactive power partition pricing model, with the minimum reactive power comprehensive cost, the minimum active network loss and voltage deviation as the optimization target, Construct active-reactive power optimization model of distribution network including response to PV inverter reactive power partition price, static var compensator SVC dynamic compensation, on-load voltage regulation equipment OLTC tap and capacitor bank switching; adopt second-order cone programming The nonlinear terms in the model are processed by mathematical methods such as the large M method, and finally a mixed integer second-order cone programming model for the coordinated optimization of active and reactive power of the distribution network with controllable photovoltaics under the power market environment is obtained, and the Bund The Sri Lankan decomposition method solves the model segmentation. The invention rationally and coordinately utilizes the reactive power capacity of the photovoltaic inverter and the reactive power support capability of the original discrete equipment of the distribution network, reduces active power network loss, and ensures user voltage quality.
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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...

Examples

Embodiment

[0172] 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...