CN103560536A - Electric energy device used for adjusting hybrid power of intermediate voltage power system - Google Patents
Electric energy device used for adjusting hybrid power of intermediate voltage power system Download PDFInfo
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- CN103560536A CN103560536A CN201310449673.0A CN201310449673A CN103560536A CN 103560536 A CN103560536 A CN 103560536A CN 201310449673 A CN201310449673 A CN 201310449673A CN 103560536 A CN103560536 A CN 103560536A
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Abstract
The invention discloses an electric energy device used for adjusting hybrid power of an intermediate voltage power system, and relates to the technical field of power electronics. Three phase cascading units are in star connection; each phase cascading unit is composed of n full-bridge inversion units, n large capacitor banks, n automatic switches and n battery pack units, the n full-bridge inversion units are connected in series, the head end of the first full-bridge inversion unit of each cascading unit is connected with a corresponding electric reactor, and the tail end of the nth full-bridge inversion unit of each cascading unit is connected with the tail ends of the nth full-bridge inversion units of other two cascading units; intermediate voltage grid connection is achieved due to the fact that the multiple single-phase full-bridge inversion units are cascaded, reactive power and transient-variation active power are adjusted through large capacitors on a direct-current bus of each unit, and slow-variation active power is adjusted through the battery pack units on the direct-current bus of each unit; besides, a grid connection transformer is not needed, little floor space is occupied, and the device is easy to maintain.
Description
Technical field:
The present invention relates to electric and electronic technical field, be specifically related to a kind of electrical energy devices regulating for intermediate voltage electric power system combined power.
Background technology:
As a kind of clean energy resource, wind power generation has obtained fast development in recent years.Because occurring in nature wind energy changes, so the active power that wind generator system sends also fluctuates.Along with the continuous increase of the wind energy turbine set capacity being connected to the grid, this fluctuation will cause serious power quality problem and jeopardize the stable operation of electrical network.Therefore, in wind generator system, need to be incorporated with the electric device that can carry out active power regulation, suppress energy fluctuation.
In addition, when electrical network generation disturbance or fault, generally also need wind power plant to there is enough dynamic reactive power enabling capabilities to electrical network, to electrical network, send reactive power, thereby stablize line voltage and frequency.Therefore, wind power plant self also needs to equip the electric device that can carry out reactive power adjusting, stablize line voltage.
At present in the practical application of wind generator system, the general apparatus for storing electrical energy that uses regulates active power, while being greater than electrical network power demand such as the active power of sending when blower fan just by unnecessary meritorious being stored in the energy-storage travelling wave tubes such as battery, super capacitor; When being less than electrical network power demand, the active power of sending the energy in energy-storage travelling wave tube is sent into electrical network.For the adjusting of reactive power, present most reactive power compensators such as compensation condenser group in parallel or Static Var Compensator, static reacance generator that adopt are realized.Although wherein opening-closing capacitor bank can realize reactive power compensation to a certain extent, because its adjusting is unsmooth, response speed slow and compensation capacity is subject to device self to hold quantitative limitation, compensation effect is in practice also bad.And dynamic reactive compensation device based on electronic power inversion technology, as Static Var Compensator, static reacance generator etc., owing to having adopted the large power all-controlled devices such as gate level turn-off thyristor, igbt, not only can absorb and can also send to electrical network idlely, can more fast and effeciently realize the adjusting to reactive power.But the function that this type systematic does not suppress the fluctuation of the active power of wind energy turbine set output.
Summary of the invention:
The object of this invention is to provide a kind of electrical energy devices regulating for intermediate voltage electric power system combined power, during the mode of a plurality of single-phase full bridge inversion units of its employing cascade realizes, press grid-connected, utilize the large electric capacity on each unit DC bus to regulate the active power of reactive power and transient change, utilize the battery assembly module on each unit DC bus to regulate the active power of slow variation; The function that active power regulation and reactive power are regulated rolls into one, and has stronger dynamic adjustments ability, in service without harmonic wave, and without grid-connected transformer, floor space is little, maintenance is simple.
In order to solve the existing problem of background technology, the present invention adopts following technical scheme: it comprises U phase cascade unit 1, V phase cascade unit 2 and W phase cascade unit 3, and three-phase cascade is star-like connection between unit; Every phase cascade unit is comprised of n full-bridge inverting unit, n large capacitor group C, a n automatic switch K and n battery assembly module, connect mutually in described n full-bridge inverting unit, the head end of first full-bridge inverting unit in each cascade unit is connected with corresponding reactor L, and the end of n full-bridge inverting unit in each cascade unit is connected with the end of n full-bridge inverting unit in two other cascade unit; DC bus in each described full-bridge inverting unit and described large capacitor group C are in parallel; Described battery assembly module is connected with described large capacitor group C by automatic switch K.
Described full-bridge inverting unit is comprised of four igbts or integrated gate commutated thyristor, and igbt or integrated gate commutated thyristor become bridge-type to connect.
Described battery assembly module is comprised of a battery pack and a two-way DC/DC converter, and battery pack is connected with two-way DC/DC converter.
The present invention has the following advantages:
One, have the functions such as meritorious fluctuation adjusting, idle adjusting and imbalance of three-phase voltage compensation, a tractor serves several purposes, compares with existing energy storage device or reactive power compensator, and function is more comprehensive, and superiority of effectiveness is fairly obvious.
Two, can substitute existing dynamic reactive compensation device completely and realize the no-power compensation function to electrical network, but compared with devices such as existing static compensators, save the grid-connected transformer of complicated heaviness, simple in structure, floor space is little.
Three, in to the adjusting of wind power generation energy fluctuation, compare with existing energy storage device, owing to having utilized the charging and discharging capabilities of large electric capacity on DC bus, thereby the input electric energy of rapid fluctuations is had to better regulating action.
Four, the battery assembly module on each unit DC bus can cut out online or drop into, and this is for periodic maintenance or change for the battery pack in the battery assembly module on each unit DC bus processing ease and safety.
Accompanying drawing explanation:
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of battery assembly module in the present invention;
Fig. 3 a is the schematic diagram that in embodiment, device needs the effective power of absorption;
Fig. 3 b is the schematic diagram of the effective power of capacitor actual absorption in embodiment;
Fig. 3 c is the schematic diagram of the effective power of battery pack actual absorption in embodiment;
Fig. 3 d is the schematic diagram that in embodiment, time shaft amplifies the active power of rear battery pack absorption;
Fig. 3 e is the schematic diagram of the magnitude of voltage on capacitor in embodiment;
Fig. 4 a is the schematic diagram of line voltage and current waveform in embodiment;
Fig. 4 b is the schematic diagram of the reactive power that in embodiment, device sends;
Fig. 4 c is the schematic diagram of the loss of circuit and device etc. self in embodiment;
Fig. 4 d is that in embodiment, device has absorbed the schematic diagram of part active power to electrical network.
Embodiment:
Referring to Fig. 1-2, this embodiment adopts following technical scheme: it comprises U phase cascade unit 1, V phase cascade unit 2 and W phase cascade unit 3, and three-phase cascade is star-like connection between unit; Every phase cascade unit is comprised of n full-bridge inverting unit, n large capacitor group C, a n automatic switch K and n battery assembly module, connect mutually in described n full-bridge inverting unit, the head end of first full-bridge inverting unit in each cascade unit is connected with corresponding reactor L, and the end of n full-bridge inverting unit in each cascade unit is connected with the end of n full-bridge inverting unit in two other cascade unit; DC bus in each described full-bridge inverting unit and described large capacitor group C are in parallel; Described battery assembly module is connected with described large capacitor group C by automatic switch K.
Described full-bridge inverting unit is comprised of four igbts or integrated gate commutated thyristor, and igbt or integrated gate commutated thyristor become bridge-type to connect.
Described battery assembly module is comprised of a battery pack and a two-way DC/DC converter, and battery pack is connected with two-way DC/DC converter.
A three-phase reactor is respectively used to: the voltage drop thereon of (1), the voltage that produces according to the voltage of electrical energy devices access point and cascade unit produces adjusting electric current; (2), filtering carrys out the high order harmonic component of Self-cascading cell current.One end of reactor is connected with corresponding cascade unit respectively, and the other end of reactor is connected with circuit breaker respectively.
A three-phase breaker for making three-phase cascade unit and electrical network cut off when electrical energy devices breaks down or keep in repair, and one end of circuit breaker is connected with corresponding reactor respectively, and the other end of circuit breaker is connected with corresponding isolating switch respectively.
A three-phase isolation switch is for guaranteeing that when circuit breaker disconnects three-phase cascade unit and electrical network cut off completely, and one end of isolating switch is connected with corresponding circuit breaker respectively, and the other end of isolating switch is connected with three of electrical network respectively.
Embodiment:
As shown in Figure 1, N=3 is counted in cascade, and in order to test conveniently, the parameters of electrical network and this device is as follows:
Under MATLAB simulated environment, the simulation result obtaining according to described operation principle and work engineering is as follows:
1, during real power control, because Power Output for Wind Power Field fluctuates, and frequency changes, and is level and smooth to electrical network power output, so the active power that electrical energy devices need to absorb and discharge also fluctuates, as shown in Figure 3 a; And battery pack is charged according to set optimum current curve, the power therefore absorbing is level and smooth, as shown in Figure 3 c; Shown in Fig. 3 d, be the active power that after time shaft amplifies, battery pack absorbs; The active power of momentary fluctuation or the active power of short time are absorbed by capacitor group, as shown in Figure 3 b; What Fig. 3 e represented is that the DC capacitor voltage of unit all will rise because capacitor group absorbs active power, but because each capacitance is inconsistent, so the magnitude of voltage on each capacitor has certain difference.
2, during idle control, as idle instruction q
*< 0, and device sends lagging reactive power, line voltage leading current 90 degree electrical degrees.As idle instruction q
*> 0, and device sends capacitive reactive power, line voltage lagging current 90 degree electrical degrees, and line voltage and current waveform are as shown in Fig. 4 a, and the reactive power that device sends is as shown in Figure 4 b.When not doing voltage stabilizing control, the loss due to circuit and device etc. self, declines DC capacitor voltage, to some extent as shown in Fig. 4 c.When adopting voltage stabilizing to control, because device has absorbed part active power to electrical network, DC capacitor voltage is remained unchanged, as shown in Fig. 4 d.
From above simulation result, can find out, the present embodiment has good dynamic property when meritorious and idle control.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. the electrical energy devices regulating for intermediate voltage electric power system combined power, is characterized in that it comprises U phase cascade unit (1), V phase cascade unit (2) and W phase cascade unit (3), and three-phase cascade is star-like connection between unit; Every phase cascade unit is comprised of n full-bridge inverting unit, a n large capacitor group (C), a n automatic switch (K) and n battery assembly module, connect mutually in described n full-bridge inverting unit, the head end of first full-bridge inverting unit in each cascade unit is connected with corresponding reactor (L), and the end of n full-bridge inverting unit in each cascade unit is connected with the end of n full-bridge inverting unit in two other cascade unit; DC bus in each described full-bridge inverting unit and described large capacitor group (C) are in parallel; Described battery assembly module is connected with described large capacitor group (C) by automatic switch (K).
2. a kind of electrical energy devices regulating for intermediate voltage electric power system combined power according to claim 1, is characterized in that described battery assembly module is comprised of a battery pack and a two-way DC/DC converter, and battery pack is connected with two-way DC/DC converter.
3. a kind of electrical energy devices regulating for intermediate voltage electric power system combined power according to claim 1, it is characterized in that described full-bridge inverting unit is comprised of four igbts or integrated gate commutated thyristor, igbt or integrated gate commutated thyristor become bridge-type to connect.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810854A (en) * | 2015-05-13 | 2015-07-29 | 兰州理工大学 | Method for coordinating and controlling power between series-connected micro-grid and micro-sources of series-connected micro-grid |
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| CN101710704A (en) * | 2009-12-17 | 2010-05-19 | 清华大学 | Electric energy adjustment device for active and reactive power adjustment of high-voltage system |
| US20130051105A1 (en) * | 2011-08-22 | 2013-02-28 | Delta Electronics (Shanghai) Co., Ltd. | Power compensation apparatus and method for renewable energy system |
| CN103280829A (en) * | 2013-04-26 | 2013-09-04 | 上海交通大学 | Isolation double-stage chain type current transformer applied to energy storage of high-capacity battery |
| CN203504198U (en) * | 2013-09-22 | 2014-03-26 | 东方日立(成都)电控设备有限公司 | Hybrid power adjusting electric power device for intermediate voltage electric power system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710704A (en) * | 2009-12-17 | 2010-05-19 | 清华大学 | Electric energy adjustment device for active and reactive power adjustment of high-voltage system |
| US20130051105A1 (en) * | 2011-08-22 | 2013-02-28 | Delta Electronics (Shanghai) Co., Ltd. | Power compensation apparatus and method for renewable energy system |
| CN103280829A (en) * | 2013-04-26 | 2013-09-04 | 上海交通大学 | Isolation double-stage chain type current transformer applied to energy storage of high-capacity battery |
| CN203504198U (en) * | 2013-09-22 | 2014-03-26 | 东方日立(成都)电控设备有限公司 | Hybrid power adjusting electric power device for intermediate voltage electric power system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810854A (en) * | 2015-05-13 | 2015-07-29 | 兰州理工大学 | Method for coordinating and controlling power between series-connected micro-grid and micro-sources of series-connected micro-grid |
| CN104810854B (en) * | 2015-05-13 | 2017-05-24 | 兰州理工大学 | Method for coordinating and controlling power between series-connected micro-grid and micro-sources of series-connected micro-grid |
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Application publication date: 20140205 |