Direct current bus voltage controller suitable for alternating current and direct current hybrid power grid
A hybrid technology of DC bus voltage and AC-DC, applied in the field of AC-DC power grid, can solve problems such as power system instability, achieve voltage stability, avoid frequent charging and discharging, and increase stability
Inactive Publication Date: 2017-05-10
YANGZHOU POWER SUPPLY CO OF STATE GRID JIANGSU ELECTRIC POWER CO +4
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to overcome the power system instability problem caused by frequent charging and discharging when controlling the DC bus voltage regulation in the prior art, and provide a DC bus voltage controller suitable for AC and DC hybrid power grids
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[0027] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0028] The AC-DC hybrid grid includes an AC grid system and a DC grid system. The DC grid system is mainly composed of renewable energy such as wind power and photovoltaics. The structure of the DC bus voltage controller of the present invention is as follows: figure 1 As shown, it consists of input filter capacitor C1, output filter capacitor C2, input filter inductor L, power switch tubes VT1, VT2, DC EMC, DC circuit breaker, fuse, contactor and other components. The input terminal voltage is Ea, and the output terminal voltage is Vs. The input end is connected in series with protective isolation devices such as DC circuit breakers, fuses, contactors, etc., then the input filter capacitor is...
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The invention discloses a direct current bus voltage controller suitable for alternating current and direction current hybrid power grid, which comprises a DC / DC converter and an energy storage battery. The bidirectional DC / DC converter is a non-isolation adopted bidirectional Buck / Boost converter with one end in connection with the direct current bus and the other in connection with the energy storage battery to mainly achieve the function of bidirectional flow of active power. The main function of the energy storage battery is to save the active power and the energy. The bidirectional DC / DC converter comprises three working modes referred to as a constant power charging mode, a constant voltage power charging mode and a constant current power discharging mode. The three modes ensure that during the self-adaptive power charging and discharging of the stored energy, repetitive power charging and discharge of the stored energy could be avoided, thus making the system more stable. In addition, the direct current bus voltage controller of the invention is of two types, one being current control mode while the other being voltage control mode, ensuring that an electric power system could provide stable direct current bus voltage in different electric states.
Description
technical field [0001] The invention relates to a DC busbar voltage controller suitable for an AC-DC hybrid power grid, belonging to the technical field of AC-DC power grids. Background technique [0002] The power quality control of the AC-DC hybrid grid is an important aspect of the AC-DC hybrid grid research. The power quality of the AC-DC hybrid grid is reflected in the AC subsystem as the AC voltage and frequency deviation meeting the corresponding standards or meeting the user's requirements, while in the DC side It is reflected in the control of the stability of the DC voltage. The DC power grid often contains renewable energy such as wind power and photovoltaics, and the fluctuation of its power generation can easily lead to changes in the voltage of the DC power grid. In addition, when the distance of the transmission line is long and the impedance is large or the transmission power exceeds the standard, it is easy to cause the voltage drop of the remote node. For...
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IPC IPC(8): H02J3/32H02M3/158
CPCH02J3/32H02M3/1582
Inventor 冯鑫振陈辉吴敏秀杨波袁晓东王德顺赵季平李官军杨川王秋军
Owner YANGZHOU POWER SUPPLY CO OF STATE GRID JIANGSU ELECTRIC POWER CO