Estimation Method of Power-Voltage Sensitivity Between Distribution Network Nodes
A voltage sensitivity, inter-node technology, applied in the direction of AC network voltage adjustment, AC network circuit, calculation, etc., can solve the problems of high cost of full coverage monitoring, difficulty in obtaining network parameters, and lack of basic files in distribution network.
Active Publication Date: 2022-06-07
南京易司拓电力科技股份有限公司
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Problems solved by technology
However, due to the following two reasons, it is difficult to obtain accurate network parameters. One is that the distribution network in operation lacks accurate basic files;
If the sensitivity coefficient is calculated by measuring the active power, reactive power and voltage value of each node, there will be problems such as high cost of full-coverage monitoring and huge amount of computation.
If there are n nodes in the network, you need to find n 2 unknown parameters, to make this n 2 If there is an accurate solution for an unknown parameter, the amount of data and calculations that need to be monitored will be large, which is difficult to meet the requirements of practicability.
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[0043] Find the power-voltage sensitivity fitting coefficient f(δp j ), f(δq j ), the main steps are:
[0044] (1) Select representative nodes of power distribution network:
[0045] In the IEEE 123 node standard test distribution network, 12 representative nodes (that is, 10% of the 123 nodes) are selected, and the representative nodes with an average operating power greater than 10 kilowatts are used as the observation nodes for the feature fitting of the whole network.
[0046] (2) Prepare representative node-based power variation datasets based on time series:
[0047] Obtain these 12 representative nodes through the monitoring terminal: 5-minute interval, 2016 consecutive times (the duration is one week, a complete load cycle), the voltage U', the current I, the active power RMS P', the reactive power Power Q', and apparent power S, power factor cos Power parameter sampling data. Through the redundant acquisition of the above power parameters, the application is not...
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The invention discloses a power-voltage sensitivity estimation method between distribution network nodes, which includes the following steps: (1) selecting a representative node of a distribution network; (2) preparing a power change data set of the representative node based on time series; (3) Prepare the voltage variation data set of node i based on time series; (4) construct the unsupervised intelligent learning fitting equation based on time window sequence; (5) solve the equation to obtain the voltage sensitivity fitting coefficient set A of node i; (6) Repeat steps (3)~(5) to obtain the voltage sensitivity fitting coefficient sets of other nodes respectively; the method of the present invention selects nodes whose number is much smaller than the total number of networks in the distribution network, and avoids relying on the network topology and network equipment of the distribution network parameters, avoiding the requirement of monitoring nodes in the entire network, and can actively adapt to the dynamic changes of the distribution network, effectively meeting the power-voltage control and evaluation requirements of the distribution network.
Description
technical field [0001] The invention relates to a method for estimating power-voltage sensitivity between nodes in a regional distribution network based on finite nodes. The "power-voltage sensitivity" of the distribution network at the current level is obtained through representative node measurement data, and belongs to the technical field of power system operation and control. Background technique [0002] With the development of new power systems, a large number of renewable energy represented by distributed photovoltaics and high-power power electronic equipment represented by charging piles have been incorporated into the distribution network, resulting in a huge challenge to the voltage quality of the distribution network. If we can make full use of the reactive power and active power adjustable capacity of the distribution network reactive power compensation devices, photovoltaic inverters, charging piles, energy storage devices and other equipment, and dynamically pa...
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IPC IPC(8): H02J3/00H02J3/16H02J3/12H02J3/28H02J3/38G06F30/27G06F113/04
CPCH02J3/00H02J3/16H02J3/12H02J3/28H02J3/381G06F30/27H02J2203/20H02J2300/24G06F2113/04Y02E70/30
Inventor 罗耀强
Owner 南京易司拓电力科技股份有限公司