A probabilistic recovery method for distribution network planning islanding based on voltage-reducing energy-saving technology
A recovery method and distribution network technology, applied in the direction of photovoltaic power generation, single-network parallel feeding arrangement, etc., to achieve the effect of improving feasibility, reducing the impact of photovoltaic prediction errors, and increasing the number of load restoration
Active Publication Date: 2022-04-01
WUHAN UNIV +1
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[0005] In order to further improve the load recovery capability of distribution network planning islands, the present invention designs a load recovery method based on step-down and energy-saving technology, while considering the uncertainty of photovoltaic power prediction, and using photovoltaic inverters to achieve more effective CVR effect, related patents have not yet been reported
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[0072] The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.
[0073] 1. Buck energy saving technology
[0074] When the power of the power supply in the island reaches the upper limit, since the system load power is the sum of the power of a single load, more loads can still be restored by reducing the power of a single load. The step-down energy-saving technology is a control method that directly reduces the load power by reducing the load operating voltage. Although there are various types of loads, they are essentially a combination of resistance and inductance, so their power will be more or less affected by the operating voltage. Through field tests in the US power grid, it is found that when the voltage is reduced by 5%, the power of different types of loads can be reduced by about 2.5% to 4.5%. At the same time, since CVR is performed on the premise that...
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The invention proposes a method for recovering distribution network planning islanding probability based on voltage reduction and energy saving technology. The recovery model first performs dynamic scene sampling on the photovoltaic forecast data, and then uses scene reduction to obtain the most likely scene set of photovoltaic power; at the same time, by optimizing the reactive power supply including the inverter, the voltage of the load node is lowered as much as possible within the allowable range , to maximize energy saving. The load restoration model will be solved in a rolling optimization manner. Rolling optimization only retains and executes the optimization results of the upcoming time period, and the optimization results of the remaining time period will be discarded. The invention utilizes the voltage reduction and energy-saving technology for the first time to carry out the load recovery process of the distribution network plan island, and can effectively increase the load recovery quantity under the condition of limited power supply.
Description
technical field [0001] The invention belongs to the technical field of multi-time scale coordinated control of distribution networks, and in particular relates to a method for recovering distribution network planning islanding probability based on voltage reduction and energy saving technology. Background technique [0002] Recently, frequent extreme weather has caused a large number of power grid failure events. When the transmission network fails, because the entire power distribution area will lose power, the traditional recovery methods based on fault location, isolation and load transfer will not be implemented, and key loads will experience a long-term blackout process. For example, Hurricane Sandy in 2012 caused nearly 8 million residents in the United States to be without power supply; in 2016, South Australia suffered a power outage of nearly 50 hours due to a strong typhoon. In this case, it is particularly important and urgent to find a more effective recovery me...
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IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 徐箭谢博宇廖思阳袁智勇于力徐全林跃欢
Owner WUHAN UNIV