Distribution network voltage control system and method based on distributed optical storage system
A technology of voltage control system and optical storage system, which is applied in the field of distribution network, can solve the problems of affecting the size of node voltage, the influence of control effect, and the deterioration of dynamic characteristics of the control system, so as to stabilize the voltage of distribution network and improve voltage stability , the effect of suppressing the voltage limit
Active Publication Date: 2019-03-26
ECONOMIC TECH RES INST OF STATE GRID ANHUI ELECTRIC POWER +1
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Problems solved by technology
[0004]
The above-mentioned method of stabilizing the voltage at the grid-connected point through the reactive power control of the DC-AC grid-connected inverter has limitations when the distributed optical storage system is connected to the distribution network on a large scale, the dynamic characteristics of the control system will deteriorate, and the control effect will be affected.
On the one hand, the command value of reactive power cannot be a constant value and changes with the voltage of the grid-connected point. How to obtain the command value of reactive power accurately and in time is a difficult point; It is also related to the active power, and the change of active power in the distribution network will also affect the size of the node voltage
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[0033] The present invention will be further explained below in conjunction with the drawings:
[0034] Such as figure 1 As shown, the distribution network voltage control system based on the distributed optical storage system of this embodiment includes a photovoltaic panel 11 that converts solar energy into electrical energy, and a photovoltaic DC / DC converter 12 that converts DC voltage into a higher DC voltage , The DC side capacitor 13, which stores electric energy, the energy storage battery pack 15, which stores or releases electric energy, the energy storage DC / DC converter 16, which absorbs the electric energy of the DC side capacitor or discharges externally, and converts the DC voltage into the AC voltage. The DC / AC converter 14, the filter 17 for filtering the output AC voltage, and the power distribution network 18. The input end of the photovoltaic DC / DC converter 12 is connected to the photovoltaic panel 11, and the output end of the photovoltaic DC / DC converter 1...
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The invention relates to a distribution network voltage control system and method based on a distributed optical storage system. The distribution network voltage control system comprises a photovoltaic cell panel, a photovoltaic DC / DC converter, a DC-side capacitor, an energy storage battery pack, an energy storage DC / DC converter, an energy storage DC / DC converter controller, an optical storage DC / AC converter, an optical storage DC / AC conversion controller, wherein the input end of the photovoltaic DC / DC converter is connected to the cell panel; the output end of the photovoltaic DC / DC converter is connected to the input end of the optical storage DC / AC converter through the DC-side capacitor; the output end of the optical storage DC / AC converter is connected to a distribution network via a filter; the input end of the energy storage DC / DC converter is connected to the battery pack; and the output end of the energy storage DC / DC converter is connected to the input end of the opticalstorage DC / AC converter. The distribution network voltage control system and method can control the voltage of the distribution network and solve the out-of-limit voltage caused by the access of a large-scale distributed optical storage system to the distribution network.
Description
Technical field [0001] The invention relates to the field of power distribution networks, in particular to a distribution network voltage control system and method based on a distributed optical storage system. Background technique [0002] The optical storage system connected to the distribution network mainly includes photovoltaic panels, photovoltaic DC / DC converters, DC side capacitors, energy storage battery packs, energy storage DC / DC converters and optical storage DC / AC converters. At present, the distribution network voltage control based on the optical storage system is realized by controlling the reactive power of the optical storage DC / AC converter, and this method is widely used. In this method, the difference between the reactive power reference value and the reactive power detection value is made, and the q-axis current reference value is generated after passing through the reactive power controller. Make the difference between the q-axis current reference value an...
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IPC IPC(8): H02J3/16H02J3/38
CPCH02J3/383H02J3/16Y02E10/56Y02E40/30
Inventor 叶斌王绪利代磊蒋从伟吴斌李奇段传科张健尹晓峰冯飞波闫兴德杨晓艳任为民曹飞刘同同
Owner ECONOMIC TECH RES INST OF STATE GRID ANHUI ELECTRIC POWER