Segmented controllable series reactor device and distribution line voltage control method thereof

A voltage control method and technology of series reactors, applied in circuit devices, AC network circuits, harmonic reduction devices, etc., can solve the problem of single inductive reactance value of power grid security compensation, improve safety and economy, and enhance no Power and voltage regulation capability, the effect of optimal power flow distribution

Inactive Publication Date: 2020-07-28
STATE GRID ZHEJIANG ELECTRIC POWER CO LTD JIAXING POWER SUPPLY CO +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the security problems of the power grid caused by the voltage exceeding the limit in the prior art and the deficiency of compensating the single inductance value, the present invention provides an adjustable inductance value o

Method used

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  • Segmented controllable series reactor device and distribution line voltage control method thereof
  • Segmented controllable series reactor device and distribution line voltage control method thereof
  • Segmented controllable series reactor device and distribution line voltage control method thereof

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Embodiment 1

[0030] Such as figure 1 The shown embodiment is a segmented controllable series reactor device, including a reactor and 3 switches; the total inductance value of the reactor is j7X L3 , there are two points N and P on the reactor, and the reactor is divided into three parts; the ratio of the inductance value of the three parts is 4:2:1; jX respectively L3 , j2X L3 , j4X L3 ; One switch is connected in parallel with one part of the reactor, and K switches are connected in series.

[0031] Such as figure 1 As shown, the left end point of the reactor is point S, and the right end point is point R. Electric energy is transmitted from the sending end SB of the power plant to the receiving end RB of the user side, and the reactor is connected in series to the line, that is, the left end S of the reactor and the sending end SB Connected, the right end R of the reactor is connected to the receiving end RB; then the SN section is expressed as L 1 , its inductance value is j4X L3 ...

Embodiment 2

[0034] Embodiment 2 includes all structures of Embodiment 1, such as figure 2 As shown, Embodiment 2 also includes a distribution line voltage control method based on a segmented controllable series reactor device, including the following steps:

[0035] Step 100, connecting segmented controllable series reactor devices in series at the line node m of the distributed photovoltaic system;

[0036] In a line with a high penetration rate of distributed photovoltaics, the circuit is equivalent to figure 2 The distribution shown, the equivalent load power at node i is P i +jQ i , there is a photovoltaic system connected to the grid at node n, and the power is P n +jQ n ; When the photovoltaic output is too large, it may cause the system voltage to exceed the limit, and the inherent reactive power compensation capability of the photovoltaic inverter is not enough to stabilize the voltage; Controllable series reactor device;

[0037] Step 200, by controlling each switch, find...

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Abstract

The invention discloses a segmented controllable series reactor device and a distribution line voltage control method thereof. The segmented controllable series reactor device comprises a reactor andK switches, wherein the reactor is provided with k-1 points to divide the reactor into K parts; and one switch is connected in parallel with one part of the reactor, and the K switches are connected in series. The K switches are connected in series and then are connected with the reactor in parallel, the inductance values of the reactors connected with the switches are different, the inductive reactance value of the reactor can be divided into 2k grades by controlling the on-off of each switch, and the inductive reactance value is changed by directly utilizing the switches, so that a controllable thyristor is omitted, the loss can be reduced, the efficiency can be improved, and harmonic waves in voltage at two ends of the reactor and flowing current can be avoided. The device is matched with a distributed photovoltaic inverter with rapid and continuous reactive power regulation capability, so that the problem of voltage rise suppression in the photovoltaic power distribution network can be better solved.

Description

technical field [0001] The invention relates to the technical field of power system reactive voltage adjustment, in particular to a segmented controllable series reactance with adjustable inductance value of a reactor, which can enhance the reactive power voltage regulation ability of the power grid, and improve the safety and economical operation of the power grid. A switch device and a method for controlling the voltage of a power distribution line. Background technique [0002] With the acceleration of the global industrialization process, the massive exploitation and utilization of traditional fossil energy has led to problems such as tight resource utilization and environmental degradation. Renewable energy, such as wind energy and solar energy, has gradually become an important choice for human sustainable development. [0003] The proportion of distributed photovoltaic power generation is gradually increasing, which brings some outstanding problems. Due to the rando...

Claims

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Application Information

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IPC IPC(8): H02J3/16H02J3/18H02J3/01
CPCH02J3/16H02J3/1807H02J3/01Y02E40/30Y02E40/40Y02E10/56
Inventor 殷伟斌严耀良石博隆丁磊明杨晓雷黄金波叶琳路怡孙维真江道灼张静炜方江晓屠一艳
Owner STATE GRID ZHEJIANG ELECTRIC POWER CO LTD JIAXING POWER SUPPLY CO
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