Voltage control device of power distribution network
A voltage management and distribution network technology, applied in the direction of AC network voltage adjustment, etc., can solve the problems of low voltage distribution network voltage instability, affecting the use of user electrical equipment, etc., to achieve the effect of automatically adjusting the power factor and avoiding the impact
Active Publication Date: 2015-07-15
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +1
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Problems solved by technology
[0003] The purpose of the present invention is to solve the problem of voltage instability in the low-voltage distribution network by disclosing a distribution network voltage control device in view of the high or low three-phase voltage on the low-voltage side of the distribution network station area, which affects the use of electrical equipment for users. question
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[0017] The specific embodiment of the present invention is shown in Fig. 1 and Fig. 2 .
[0018] Fig. 2 is a circuit structure diagram of a distribution network voltage control device in this embodiment.
[0019] A distribution network voltage control device in this embodiment includes a three-phase voltage detection module 11 , an uncontrollable rectification module 12 , a DC boost module 13 and a three-phase output module 14 .
[0020] The three-phase voltage detection module 11 is installed at the input end of the three-phase low-voltage circuit, and is used to detect the three-phase voltage value at the input side, thereby calculating the unbalance degree of the three-phase voltage;
[0021] The uncontrollable rectification module 12 includes a three-phase bridge rectification circuit composed of six rectification diodes, and reactors L1, L2 and L3 are installed at its front end in order to prevent the influence of instantaneous impact of current.
[0022] The DC boost mo...
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The invention discloses a voltage control device of a power distribution network. The voltage control device of the power distribution network comprises a three-phase voltage detection module (11), an uncontrollable rectification module (12), a direct-current voltage boosting module (13) and a three-phase output module. The voltage control device is connected between a tail end of a secondary side of a power distribution transformer and a user in series during use; the device is in parallel connection with a switch KM; when the three-phase voltage detection module of the device detects that the three-phase voltage is between (200+7) V and (200-10%) and the three-phase current unbalance degree is smaller than 15%, the KM is in a switched-on state, the device is in a short-circuit state; when the three-phase voltage exceeds the national power distribution network standard voltage and the three-phase current unbalance degree is larger than 15%, or one of the conditions is not met, the KM is in a switched-off state, and the device is in a working state; no matter which state the KM is in, a KM2 is in a switched-on state all the time, thereby ensuring that the voltage of the direct-current voltage boosting module is stabilized at 720V and waiting for three-phase output instructions at any time; when the three-phase inverter side is in a short-circuit state, the KM2 is tripped off, thereby ensuring seamless output of the three-phase inverter side during state switching of the KM.
Description
technical field [0001] The present invention relates to a distribution network voltage control device, which belongs to the field of electric power distribution technology Background technique [0002] With the improvement of production and living standards, the rapid increase of various types of electrical equipment for residents, businesses, and industries. Due to the long power supply radius of some 10kV grids, the voltage loss at the end of the line is too large, some stations are heavily loaded, and the wire cross section is small. The 10KV high-voltage side voltage is low due to insufficient reactive power supplementation of the line, which causes the low-voltage side voltage to be low; at the same time, there are a large number of asynchronous motors and other impact loads in the low-voltage side distribution network, resulting in natural power factors in some areas. Low; when the capacity of the compensation parallel capacitor is insufficient, the line will t...
Claims
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Inventor 徐在德范瑞祥邓才波纪清照
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST