Centralized-local comprehensive voltage control method and device for power distribution network with photovoltaic access

A distribution network and photovoltaic technology, applied in the direction of AC network voltage adjustment, system integration technology, single-network parallel feeding arrangement, etc., can solve problems such as inverter parameter reset, local control coordination difficulties, constraints, etc.

Inactive Publication Date: 2020-07-31
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although the centralized control can effectively coordinate the reactive power output of different photovoltaic inverters, the data transmission delay and the large amount of calculation restrict the response of the centralized control to the rapid change of photovoltaic power, and the prediction error will also significantly affect the centralized control. Effect
[0005] Aiming at the difficulty of local control coordination, some studies have po

Method used

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  • Centralized-local comprehensive voltage control method and device for power distribution network with photovoltaic access
  • Centralized-local comprehensive voltage control method and device for power distribution network with photovoltaic access
  • Centralized-local comprehensive voltage control method and device for power distribution network with photovoltaic access

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Embodiment 1

[0074] This example introduces a centralized-on-site comprehensive voltage control method for a distribution network with photovoltaic access, refer to figure 1 As shown, the methods include:

[0075] Obtain photovoltaic and load forecast data at the first set sampling interval;

[0076] Based on the obtained data, use the pre-built centralized control model to calculate and update the droop slope of the inverter of each photovoltaic access node; the centralized control model is based on the optimization goal of minimizing the network loss of the distribution network, considering the network power flow constraints , Inverter droop curve slope constraints, inverter reactive power output constraints, the optimization objective function with the inverter droop slope of the photovoltaic access node as the optimization variable; the inverter reactive power output constraints of each node and the droop curve slope constraints , determined according to predetermined node overvoltage...

Embodiment 1-2

[0081] This embodiment is based on Embodiment 1 to implement a method for centralized-local comprehensive control of a distribution network with photovoltaic access. For the principle, refer to figure 2 As shown, the centralized control stage is based on the short-term forecasted photovoltaic and load forecast data. The optimization goal of the centralized control model is to minimize the network loss of the distribution network, and the optimized control variable is the voltage-reactive power of each photovoltaic access node photovoltaic inverter Droop slope, the constraints of the objective function optimization process include distribution network power flow constraints, inverter reactive power control constraints, and droop slope constraints. In the centralized control stage, after the inverter droop slope of each photovoltaic access node is optimized and calculated, the control content of the local stage can be executed. The local control is based on the local measured vo...

Embodiment 2

[0182] This embodiment is a centralized-on-site integrated voltage control device for a distribution network with photovoltaic access, including:

[0183] The first data sampling module is configured to obtain distribution network photovoltaic and load forecast data at a set first sampling interval;

[0184] The centralized control module is configured to use a pre-built centralized control model to calculate and update the droop slope of the inverters of each photovoltaic access node based on the obtained data; For the optimization objective, considering network power flow constraints, inverter droop curve slope constraints, and inverter reactive power output constraints, the optimization objective function takes the inverter droop slope of photovoltaic access nodes as the optimization variable; the inverters of each node have no The power output constraint and the droop curve slope constraint are determined according to the predetermined node overvoltage boundary point and u...

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Abstract

The invention discloses a centralized-local comprehensive voltage control method and device suitable for a power distribution network with high-proportion photovoltaic access. The method comprises thefollowing steps: in a centralized control phase, acquiring photovoltaic and load prediction data of a power distribution network at a first sampling interval, and optimally calculating and updating the inverter droop slopes of each photovoltaic access node by using a pre-constructed centralized control model and taking the minimum loss of the power distribution network as an optimization target and considering a network power flow constraint, an inverter droop curve slope constraint and an inverter reactive output constraint; and in a local control stage, acquiring the real-time measurement voltages of each photovoltaic access node at a second sampling interval in the first sampling interval, and determining a voltage-reactive droop curve according to the current droop slopes of the inverters of each photovoltaic access node so as to perform local control on the corresponding node. According to the invention, optimization of reactive power control is realized by combining centralizedcontrol and local control modes, so that photovoltaic prediction errors and power fluctuation can be quickly responded, and effective coordination among equipment can be realized.

Description

technical field [0001] The invention relates to the technical field of electricity consumption information collection and analysis, in particular to a centralized-on-site comprehensive voltage control method and device suitable for a distribution network with a high proportion of photovoltaic access. Background technique [0002] In recent years, the photovoltaic grid-connected installed capacity of medium and low voltage distribution networks has grown rapidly, and photovoltaics in medium and low voltage distribution networks have shown a development trend of "decentralized development and nearby consumption". At the same time, the high proportion of photovoltaic grid-connected also has a significant negative impact on the low-voltage distribution network, manifested in: 1) the power flow changes from one-way flow to two-way flow, especially in the case of strong sunlight, it is easy to appear obvious reverse power flow, which leads to The voltage exceeds the upper limit; 2...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/24H02J3/16H02J3/50G06Q10/04G06Q50/06
CPCG06Q10/04G06Q50/06H02J3/16H02J3/24H02J3/50Y02E40/30Y02E40/70Y04S10/50
Inventor 王子凌周金辉苏义荣孙保华
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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