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Improved method and device for establishing comprehensive load model
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A technology of comprehensive load model and establishment method, applied in the direction of circuit device, AC network load balance, single network parallel feeding arrangement, etc., can solve the problem that the load characteristics cannot be accurately described
Active Publication Date: 2019-01-04
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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[0004] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide an improved comprehensive load model establishment method and device, aiming at solving the problem that the traditional comprehensive load model cannot The problem of accurately characterizing loads
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specific Embodiment 1
[0106] Such as figure 1 with image 3 As shown, the embodiment of the present invention provides an improved method for establishing a comprehensive load model, including:
[0107] Photovoltaic step S101:
[0108] Considering the low voltage ride-through situation of distributed photovoltaics, adaptively adjust the reactive current command;
[0109] According to the photovoltaic grid-connected control strategy and feedforward decoupling strategy, the corresponding control block diagrams of the d-axis component and the q-axis component are obtained;
[0111] According to the calculated total transfer function and the adjusted reactive current command, construct the equivalent load model of photovoltaic grid-connected;
[0113] According to the equivalent load model of energy storage grid-connected and the equivalent load model of phot...
specific Embodiment 2
[0157] The embodiment of the present invention provides an improved comprehensive load model establishment device, including:
[0158] Photovoltaic module 201 for:
[0159] Considering the low voltage ride-through situation of distributed photovoltaics, adaptively adjust the reactive current command;
[0160] According to the photovoltaic grid-connected control strategy and feedforward decoupling strategy, the corresponding control block diagrams of the d-axis component and the q-axis component are obtained;
[0161] Calculate the total transfer function of the control block diagram;
[0162] According to the calculated total transfer function and the adjusted reactive current command, construct the equivalent load model of photovoltaic grid-connected;
[0163] Build an equivalent load model for energy storage and grid connection;
[0164] According to the equivalent load model of energy storage grid-connected and the equivalent load model of photovoltaic grid-connected, construct a photo...
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Abstract
The invention discloses an improved method and device for establishing a comprehensive load model. Considering the distributed photovoltaic low-voltage crossing condition, the invention adjusts the reactive current command adaptively. According to the grid-connected control strategy and feed-forward decoupling strategy, the corresponding control block diagram is obtained. The total transfer function of the control block diagram is calculated and the equivalent load model of photovoltaic grid connection is constructed. Build the equivalent load model of energy storage and grid-connected, buildthe load model of photovoltaic energy storagedistributed generation; According to the characteristics of electric vehiclecharge and discharge, the electric vehiclecharge and discharge load model isestablished. Finally, on the basis of the traditional integrated load model, a new generalized integrated load model is constructed by adding the above-mentioned distributed power supply and the charge-discharge characteristics of electric vehicles. The invention considers the low voltage crossing in the photovoltaic model, improves on the basis of the photovoltaic Norton equivalent model, considers the charge and discharge characteristics of the electric vehicle, thus more accurately describing the load characteristics, and can improve the accuracy of the power system simulation calculation.
Description
Technical field [0001] The present invention relates to the technical field of power system automation, in particular to an improved method and device for establishing a comprehensive load model. Background technique [0002] With the development of science and technology, issues such as energy shortage and insufficient energy supply have attracted widespread attention, and the application of new energy in the power system has gradually expanded. With the development and rapid advancement of distributed power generation technology, the access capacity of distributed power generation will continue to increase. On the other hand, in recent years, all countries have been vigorously developing high-efficiency, clean and renewable energy, and have gradually increased the development of electric vehicles featuring the “replacement of oil with electricity” feature. The traditional comprehensive load model may no longer be able to describe load characteristics well. Therefore, studying...
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