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Modulation device and method for electric energy parameters at tail end of low-voltage line in power distribution area

A technology for low-voltage lines and voltage parameters, which is applied to circuit devices, emergency protection circuit devices, and AC network voltage adjustments. governance effect

Active Publication Date: 2020-08-14
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a modulation device and method for electric energy parameters at the end of a low-voltage line in a distribution station area, which solves the current shortcomings of poor power quality control and poor economy on the low-voltage user side

Method used

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  • Modulation device and method for electric energy parameters at tail end of low-voltage line in power distribution area
  • Modulation device and method for electric energy parameters at tail end of low-voltage line in power distribution area
  • Modulation device and method for electric energy parameters at tail end of low-voltage line in power distribution area

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Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, a modulation device for electric energy parameters at the end of the low-voltage line in the distribution station area, including: a maintenance circuit breaker connected in series on the low-voltage line and a modulation circuit connected in parallel to both sides of the maintenance circuit breaker; the modulation circuit includes sequentially connected in series A PWM rectifier, an inverter and an output circuit breaker, and a DC capacitor is connected between the output end of the PWM rectifier and the input end of the inverter;

[0031] The modulation device also includes a central control unit connected to the PWM rectifier and inverter respectively. The central control unit is used to open the maintenance circuit breaker and close the output circuit breaker when the low-voltage line is in a low-voltage state, so that the PWM rectifier, DC capacitor, inverter The controller is connected to the low-voltage line, so that the modulation devi...

Embodiment 2

[0034] Embodiment 2 is a preferred embodiment of Embodiment 1. It differs from Embodiment 1 in that it expands the structure and function of the modulation device for electric energy parameters at the end of the low-voltage line in the distribution station area. The steps of the modulation method of the electric energy parameters at the end of the low-voltage line in the station area have been refined:

[0035] Such as figure 2As shown, the invention discloses a modulation device for electric energy parameters at the end of a low-voltage line in a distribution station area, including: a central control unit, a remote monitoring module, a lightning arrester, a bypass contactor, a monitoring component, and a low-voltage line connected in series The maintenance circuit breaker on the maintenance circuit breaker and the modulation circuit connected in parallel on both sides of the maintenance circuit breaker; the modulation circuit includes an input circuit breaker, an input filt...

Embodiment 3

[0053] The present invention also discloses a method for modulating electric energy parameters at the end of the low-voltage line in the distribution station area, which is applied to the modulation device for electric energy parameters at the end of the low-voltage line in the distribution station area in any of the above embodiments, including the following steps:

[0054] S1: Collect the voltage parameters and current parameters of the low-voltage line in real time through the monitoring component of the modulation device, and send the voltage parameters and current parameters of the low-voltage line to the central control unit,

[0055] S2: The central control unit receives the voltage parameter and the current parameter, and compares the voltage parameter with the preset low-voltage threshold range. When the comparison shows that the voltage parameter is in the low-voltage threshold range, the control modulation device enters the boost working mode, and the low-voltage line...

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Abstract

The invention discloses a modulation device and method for electric energy parameters at the tail end of a low-voltage line of a power distribution area. The modulation device comprises an overhaul circuit breaker connected to the low-voltage line in series and a modulation circuit connected to the overhaul circuit breaker in parallel. The modulation circuit comprises a PWM rectifier, an inverterand an output circuit breaker which are sequentially connected in series, and a direct-current capacitor is connected between the output end of the PWM rectifier and the input end of the inverter; themodulation device further comprises a central control unit connected with the PWM rectifier and the inverter. The central control unit is used for switching off the overhaul circuit breaker and switching on the output circuit breaker when the low-voltage line is in low voltage, so that the PWM rectifier, the direct-current capacitor and the inverter are connected to the low-voltage line, the modulation device enters a boost working mode, and the low-voltage line is boosted; and when reactive power loss exists in the low-voltage line, the central control unit closes the overhaul circuit breaker and disconnects the output circuit breaker is disconnected, so that the PWM rectifier and the direct-current capacitor are connected to the low-voltage line, and the modulation device enters a reactive power compensation mode.

Description

technical field [0001] The invention relates to the field of low-voltage electric energy quality management of distribution networks, in particular to a modulation device and method for electric energy parameters at the end of low-voltage lines in a distribution station area. Background technique [0002] With the rapid development of the national economy and the continuous improvement of people's living standards, high-power household appliances are gradually used in urban and rural households. In addition, during the Spring Festival, a large number of migrant workers return to their hometowns, and the load on rural power grids will increase sharply. However, during the construction and transformation of rural power grids, due to the low forecast of load growth, there will be problems such as low voltage at the end of the user during the peak period of power consumption, forming a phenomenon of "small horses and large carts". It can be seen that the contradiction between th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26G01R22/06H02J3/12H02J13/00H02M5/458
CPCH02H7/262G01R22/06H02J3/12H02J13/00006H02M5/4585Y04S40/12Y02B90/20
Inventor 万代朱光明黎刚余斌齐飞赵邈由凯彭思敏曾惠芳刘海峰彭敏李娥英徐波朱聪楚桂英
Owner STATE GRID HUNAN ELECTRIC POWER
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