CN203399013U - Static synchronous compensator based on three-level H bridge cascade and voltage source inversion module - Google Patents
Static synchronous compensator based on three-level H bridge cascade and voltage source inversion module Download PDFInfo
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- CN203399013U CN203399013U CN201320406950.5U CN201320406950U CN203399013U CN 203399013 U CN203399013 U CN 203399013U CN 201320406950 U CN201320406950 U CN 201320406950U CN 203399013 U CN203399013 U CN 203399013U
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Abstract
The utility model provides a voltage source inversion module, which comprises a bypass switch circuit, a three-level H bridge and a DC side capacitance voltage discharge loop. The utility model further provides a corresponding single-phase chained static synchronous compensator based on three-level H bridge cascade, and a static synchronous compensator based on three-level H bridge cascade. The utility model overcomes the defects of a conventional cascade STATCOM and defects of a high-voltage system with too many serially connected modules, and provides a STATCOM based on three-level H bridge cascade. A single module of the topological structure is high in overpressure resistant level, small in size, and low in harmonic wave in the output current.
Description
Technical field
The utility model relates to Power System Flexible ac transmission (FACTS) technical field, particularly a kind of static synchronous reactive power compensator based on three level H-bridge module-cascades.
Background technology
In recent years, energy-saving and emission-reduction, resources conservation Cheng Liao various countries question of common concern, electric energy is as being most widely used, pressing close to most the energy of industrial production and people's lives, and energy-conservation, the efficient operation of the links that it is produced, carries and uses becomes the focus that people pay close attention to.Power application electronic technology team electric power system major parameter regulates and controls, and improves the controllability of electric power system, the FACTS technology of validity and reliability is widely used and studies.
STATCOM (STATCOM based on voltage source inverter, Static Synchronous Compensator), compare and have the following advantages with the Static VAR Compensation SVC of traditional thyristor control: (1) STATCOM governing speed is fast, compensation range is wide, and anti-power network fluctuation ability is strong; (2) can greatly reduce the harmonic content in offset current after adopting many level and PWM technology, noise is little; (3) capacitor used and reactor volume are little, have reduced equipment volume and cost.
At present, the main circuit of STATCOM mainly comprises three kinds of structures, i.e. multiple inverter configuration, many level structure and chain structure.Wherein multiple inverter configuration be take Three-phase high-power voltage source converter as core, direct voltage on capacitor produces the square-wave voltage of the some degree of phase difference by inversion, through the electromagnetic coupled of multiplex transformer, at output, produce three-phase staircase voltage, to reduce output harmonic wave.In the method, three-phase shares a direct voltage, cannot divide phase control, and transformer loss is large, cost is high, floor space is large.Many level structure is the many level structure that adopts clamp diode or electric capacity to form, and aggregated(particle) structure dynamic property is good, and output current harmonics is few, compact conformation.But after level surpasses five, system is controlled complexity and greatly raise, and be difficult to realize the control of capacitance voltage balance.Each is an independently chain mutually for chain structure STATCOM, N the identical inversion unit of structure, consists of.This structure has output harmonic wave electric current little, and floor space is few, and the response time is short, reactive power compensation wide ranges, and easy care, easily expansion, low cost and other advantages, has become the focus of domestic and international expert's research, and has progressively been applied in grid.
The core of chain type STATCOM is modular voltage source inverter, and traditional chain structure module is comprised of two level H-bridge modules.This mode is simple in structure, easily realization, but two level H-bridges series winding modules are many in the situation that electric pressure is high, and this had both increased the volume installing, and had also increased the difficulty of control system.For this shortcoming, the utility model proposes a kind of STATCOM of three level H-bridge cascade connections, equipment is the in the situation that of identical electric pressure and switching tube, and serial module structure is few, volume is little, reduce control system complexity, increased equipment dependability.
Utility model content
The purpose of this utility model is the deficiency that overcomes existing cascade STATCOM, for the many defects of high-pressure system serial module structure, a kind of STATCOM by three level H-bridge module-cascades is provided, the individual module voltage withstand class of this topological structure is high, volume is little, and output current harmonics is few.
According to Yi Ge of the present utility model aspect, a kind of voltage source inversion module is provided, comprise the by-pass switch circuit, three level H-bridges, the DC capacitor voltage discharge loop that connect successively, wherein:
Described by-pass switch circuit is used for realizing defencive function, and described by-pass switch circuit is connected in parallel on the interchange outlet side of described three level H-bridges,
The direct current that described three level H-bridges have been used for voltage source inversion module is to the invert function exchanging, and described three level H-bridges comprise three level brachium pontis of two diode clamps and by two DC side energy storage capacitor C
1, C
2the capacitor group forming, three level brachium pontis and the capacitor group of two diode clamps are connected in parallel, the anode of two three level brachium pontis is all connected with the positive pole of capacitor group, the negative electrode of two three level brachium pontis is all connected with the negative pole of capacitor group, the neutral point of two three level brachium pontis is all connected with the neutral point of capacitor group, and the mid point of two three level brachium pontis forms interchange output point;
Described DC capacitor voltage discharge loop has been used for that DC side energy storage capacitor overtension, DC side energy storage capacitor voltage are unbalanced, the DC side energy storage capacitor electric discharge of voltage source inversion module while promptly or normally exiting, and described DC capacitor voltage discharge loop comprises full-control type device T
9, T
10with discharge resistance R
1, R
2, full-control type device T
9, discharge resistance R
1after series connection, be connected in parallel on DC side energy storage capacitor C
1two ends, full-control type device T
10, discharge resistance R
2after series connection, be connected in parallel on DC side energy storage capacitor C
2two ends.
Preferably, described three level H-bridges comprise the brachium pontis consisting of full-control type device.
Preferably, described full-control type device is igbt, door pole stream-exchanging thyristor, gate level turn-off thyristor, power transistor or field of electric force effect transistor.
According to another aspect of the present utility model, a kind of single-phase chain static synchronous compensator based on three level H-bridge cascade connections is also provided, comprise the voltage source inversion module described in any one in a plurality of claims 1 to 3 of series connection.
Preferably, when voltage source inversion module works described in by-pass switch circuit be open-circuit condition, the ac-side current of described three level H-bridges flows through in described three level H-bridges; When break down in voltage source inversion module inside, described by-pass switch circuit turn-on, the ac-side current of described three level H-bridges flows through in by-pass switch circuit, realizes the online excision of false voltage source inversion module.
According to another aspect of the present utility model, a kind of STATCOM based on three level H-bridge cascade connections is also provided, comprise a plurality of above-mentioned single-phase chain static synchronous compensators and a plurality of linked reactor, wherein, the higher harmonic current that described linked reactor produces for filtering change of current chain, described linked reactor is placed in the two ends of each single-phase chain static synchronous compensator, between a plurality of single-phase chain static synchronous compensators, triangle connects, described triangle connection is specially: three circuit that are comprised of reactor and single-phase chain static synchronous compensator head and the tail links successively.
Preferably, also comprise cooling system, lightning arrester, precharge loop, wherein, described cooling system is cooling for STATCOM change of current chain and linked reactor; Described lightning arrester and single-phase chain static synchronous compensator are connected in parallel, and described lightning arrester is for realizing the overvoltage protection of single-phase chain static synchronous compensator; Connecting with single-phase chain static synchronous compensator in described precharge loop, when described precharge loop is used for realizing STATCOM and powers on, DC side energy storage capacitor is carried out to precharge.
According to another aspect of the present utility model, a kind of STATCOM based on three level H-bridge cascade connections is also provided, comprise a plurality of above-mentioned single-phase chain static synchronous compensators and a plurality of linked reactor, wherein, the higher harmonic current that described linked reactor produces for filtering change of current chain, described linked reactor is placed in one end that described single-phase chain static synchronous compensator is connected with grid side, Y-connection between a plurality of single-phase chain static synchronous compensators, described Y-connection is specially: one end of three disconnected described linked reactors of single-phase chain static synchronous compensator terminates on a common node.
Preferably, also comprise cooling system, lightning arrester, precharge loop, wherein, described cooling system is cooling for STATCOM change of current chain and linked reactor; Described lightning arrester and single-phase chain static synchronous compensator are connected in parallel, and described lightning arrester is for realizing the overvoltage protection of single-phase chain static synchronous compensator; Connecting with single-phase chain static synchronous compensator in described precharge loop, when described precharge loop is used for realizing STATCOM and powers on, DC side energy storage capacitor is carried out to precharge.
More specifically, in order to reach above utility model object, each of STATCOM main circuit is all mutually that the chain unit by a plurality of same structures is in series, comprising cooling system, linked reactor, lightning arrester, precharge loop and voltage source inverted power module:
The effect of described linked reactor is the higher harmonic current that filtering change of current chain produces, and realizes the energy exchange between STATCOM and network system.When STATCOM is triangle connection, linked reactor is placed in the voltage source inversion module Lian two ends of each phase; When it is Y-connection, linked reactor is placed in one end that voltage source inversion module chain is connected with grid side;
Described lightning arrester and the use in parallel of voltage source inversion module chain, for realizing the overvoltage protection of voltage source inversion module chain;
Connecting with voltage source inversion module chain in described precharge loop, while powering on for realizing major loop, DC bus capacitor is carried out to precharge;
Described cooling system is cooling for major loop;
Described voltage source inverted power module, is comprised of all-controlling power electronics device, power diode, discharge circuit, by-pass switch circuit and capacitor.Wherein entirely control the commutation that power electronic device and power diode are realized power model, capacitor is DC side energy-storage travelling wave tube, and discharge circuit and by-pass switch circuit are for the online switching of power model;
Wherein, in voltage source inversion module, commutation part is three level H-bridge structures with DC side energy storage section.Two brachium pontis of H bridge construction are composed in parallel by three single-phase level brachium pontis, and DC side storage capacitor part is in series by single electric capacity or the capacitance group of two identical reactance parameters, and the neutral point of DC bus capacitor is connected with two H bridge neutral points.Three level structure brachium pontis comprise: diode clamp type three level, three level (ANPC) structure of capacitor pincers bit-type three level and full-control type device clamper.
Wherein, discharge circuit is comprised of all-controlling power electronics device and discharge resistance, is mainly used in when DC capacitor voltage is too high, DC capacitor voltage is unbalanced, the DC bus capacitor electric discharge of inversion module while promptly or normally exiting.
Wherein, by-pass switch main circuit to realize chain link module at defencive function, be connected in parallel on the interchange outlet side of H bridge inverter circuit.When chain link module works, it is open-circuit condition, and ac-side current flows through in H bridge inverter circuit; When chain link inside modules breaks down, master controller judges and gives an order through fault, blocks H bridge inverter circuit, makes bypass circuit conducting simultaneously, and output current flows through in bypass circuit, realizes the online excision of fault chain link.
This H bridge inversion module doubles than the withstand voltage increasing of two level H-bridge modules, and power density is large, can effectively reduce the volume of STATCOM equipment, reduces its complexity, increases stable and reliability.
Above-described all-controlling power electronics device comprises: igbt (IGBT), door pole stream-exchanging thyristor (IGCT), gate level turn-off thyristor (GTO), power transistor (GTR) and field of electric force effect transistor (P-MOSFET).
Accompanying drawing explanation
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present utility model will become:
Fig. 1 is the single-phase composition schematic diagram of the utility model, and it is in series by n voltage source inversion module.
Fig. 2 is the different connection schematic diagrames that three-phase STATCOM of the present utility model connects from electrical network: in figure, left side is that star connection, right side are dihedral connection.
Fig. 3 is the internal main loop structure schematic diagram of STATCOM voltage source inversion module, and full-control type device is IGBT.
Fig. 4 is the internal main loop structure schematic diagram of STATCOM voltage source inversion module, and full-control type device is IGCT.
The STATCOM system main wiring diagram that Fig. 5 is 35KV for foundation electric pressure of the present utility model.
Embodiment
Below in conjunction with specific embodiment, the utility model is elaborated.Following examples will contribute to those skilled in the art further to understand the utility model, but not limit in any form the utility model.It should be pointed out that to those skilled in the art, without departing from the concept of the premise utility, can also make some distortion and improvement.These all belong to protection range of the present utility model.
Chain type STATCOM is the product of power electronic technology, Computer Control Technology and control theory development, it is parallel in electric power system, by to the detection of system voltage and electric current and collection, the reactive power compensation amount that the system of calculating will compensate, then compensates by controlling amplitude and the phase place of STATCOM equipment output voltage.It is compared with adopting the STATCOM of transformer multiple inverter: saved multiplex transformer, this greatly reduces the loss of device and the floor space of whole compensation equipment; Its half-bridge converter is comprised of voltage source inversion unit chain independently, based on realizing modularization and redundancy running, has improved equipment dependability, and can realize independent minute phase control, is conducive to the compensation problem of resolution system three-phase imbalance.
Fig. 1 is the single-phase combination schematic diagram of chain type STATCOM, and it is comprised of n the identical voltage source inversion module of structure, and the output voltage of i voltage source inversion module is V
ki, i=1,2 ..., n, the output voltage V of chain type STATCOM
sfor n voltage source inversion module output voltage and:
V
s＝V
k1+V
k2+…+V
kn
Fig. 2 is chain type STATCOM three-phase structure schematic diagram in parallel with electrical network, comprises two kinds of wye connection and angle type connections.The connection that STATCOM is different, requires also different to the connection of reactor: when adopting wye connection, and the side that the inversion module chain that three reactors are connected on respectively each phase is connected with electrical network; When adopting angle type connection, need six reactors, be connected on respectively the inversion module Lian two ends of each phase.
Fig. 3 and Fig. 4 are by full-control type device IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) and IGCT (Intergrated Gate Commutated Thyristors, integrated grid commutated thyristor) realize the internal main loop structure schematic diagram of the voltage source inversion module based on three level H-bridge structures.In two figure, just full-control type power tube is different, thus take the internal structure that further describes voltage source inversion module with the figure of IGBT realization, as shown in Figure 3.Voltage source inversion module internal main loop comprises: three level H-bridges, DC capacitor voltage discharge loop and by-pass switch circuit.
The direct current that described three level H-bridges have been used for voltage source inversion module is to the invert function exchanging, and by three level brachium pontis and the DC side energy storage capacitor of two diode clamps, is formed in parallel.Wherein, three level brachium pontis of two diode clamps are by full-control type power tube T
1, T
2, T
3, T
4, T
5, T
6, T
7, T
8with clamp diode D
1, D
2, D
3, D
4form, DC side energy storage capacitor is by two capacitor C that model is identical
1, C
2be composed in series.Wherein the anode of two three level brachium pontis (is T
1, T
5collector electrode) with the positive pole of capacitor group (be C
1positive pole) be connected, the negative electrode of two three level brachium pontis (is T
4, T
8emitter) with the negative pole of capacitor group (be C
2negative pole) be connected, the neutral point of two three level brachium pontis (is D
1, D
2tie point and D
3, D
4tie point) with the neutral point of capacitor group (be C
1, C
2tie point) be connected, the interchange output point of three level H-bridge structures is the mid point of two three level brachium pontis, is T
2, T
3tie point and T
6, T
7tie point.
Described DC capacitor voltage discharge loop mainly completes that DC capacitor voltage is too high, DC capacitor voltage is unbalanced, the DC bus capacitor electric discharge of inversion module while promptly or normally exiting.Described DC capacitor voltage discharge loop is by full-control type power tube T
9, T
10with discharge resistance R
1, R
2form.T
9, R
1after series connection, be connected in parallel on capacitor C
1two ends, T
10, R
2after series connection, be connected in parallel on capacitor C
2two ends.Can complete the equilibrium of DC bus capacitor group and control of discharge by power ratio control pipe.
Described by-pass switch main circuit will be realized the defencive function of chain link module, is connected in parallel on the interchange outlet side of three level H-bridges.By-pass switch circuit major requirement operation has rapidity and the high characteristic of through-current capability, generally select the bypass means based on power electronic device to be realized by thyristor or the reverse series and parallel of IGBT, the method realizes simple, but cost compare is high, electronic components requires configuration circuit complicated.With power diode and full control power tube, realize, AC voltage commutation is become to direct current, DC side is controlled by entirely controlling power tube, and the method cost is relatively low, and circuit is simple, but shunt loss is large.With mechanical switch, realize bypass circuit, the method and upper two kinds of method ratios, circuit structure is simple, and device element is few, and cost is low.
In sum according to STATCOM system of the present utility model, be applied in main wiring diagram in 35KV network system as shown in Figure 5.Chain type STATCOM system based on three level H-bridge structures is star-like connected mode, by an isolation switch (band ground connection) QS1, circuit breaker Q F, three current transformer TA (a, b, c), an isolation switch QS2 and three lightning arrester F1 (a, b, c) be connected with 35KV electrical network.
In STATCOM main loop, each is all mutually that three level H-bridge modules by same number are in series, and wherein the internal circuit schematic diagram of three level H-bridge modules as shown in Figure 3.Wherein each phase three level H-bridge chain is all in parallel with a lightning arrester (F1, F2, F3), by reactor (L1, L2, L3), is connected with system with precharge loop.Wherein precharge loop has respectively pre-charge resistance (R1, R2, R3) and bypass breaker QF2 to form.
STATCOM system based on three level H-bridge cascade connections, the withstand voltage increasing of voltage source inversion module than traditional two level H-bridge cascade connection STATCOM doubles, and power density is large, can effectively reduce the volume of STATCOM equipment, reduce its complexity, effectively increase stability and the reliability of equipment.
Above specific embodiment of the utility model is described.It will be appreciated that, the utility model is not limited to above-mentioned particular implementation, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present utility model.
Claims (8)
1. a voltage source inversion module, is characterized in that, comprises the by-pass switch circuit, three level H-bridges, the DC capacitor voltage discharge loop that connect successively, wherein:
Described by-pass switch circuit is used for realizing defencive function, and described by-pass switch circuit is connected in parallel on the interchange outlet side of described three level H-bridges;
The direct current that described three level H-bridges have been used for voltage source inversion module is to the invert function exchanging, and described three level H-bridges comprise three level brachium pontis of two diode clamps and by two DC side energy storage capacitor C
1, C
2the capacitor group forming, three level brachium pontis and the capacitor group of two diode clamps are connected in parallel, the anode of two three level brachium pontis is all connected with the positive pole of capacitor group, the negative electrode of two three level brachium pontis is all connected with the negative pole of capacitor group, the neutral point of two three level brachium pontis is all connected with the neutral point of capacitor group, and the mid point of two three level brachium pontis forms interchange output point;
Described DC capacitor voltage discharge loop has been used for that DC side energy storage capacitor overtension, DC side energy storage capacitor voltage are unbalanced, the DC side energy storage capacitor electric discharge of voltage source inversion module while promptly or normally exiting, and described DC capacitor voltage discharge loop comprises full-control type device T
9, T
10with discharge resistance R
1, R
2, full-control type device T
9, discharge resistance R
1after series connection, be connected in parallel on DC side energy storage capacitor C
1two ends, full-control type device T
10, discharge resistance R
2after series connection, be connected in parallel on DC side energy storage capacitor C
2two ends.
2. voltage source inversion module according to claim 1, is characterized in that, described three level H-bridges comprise the brachium pontis consisting of full-control type device.
3. voltage source inversion module according to claim 2, is characterized in that, described full-control type device is igbt, door pole stream-exchanging thyristor, gate level turn-off thyristor, power transistor or field of electric force effect transistor.
4. the single-phase chain static synchronous compensator based on three level H-bridge cascade connections, is characterized in that, comprises the voltage source inversion module described in any one in a plurality of claims 1 to 3 of series connection.
5. the STATCOM based on three level H-bridge cascade connections, it is characterized in that, comprise a plurality of single-phase chain static synchronous compensators claimed in claim 4 and a plurality of linked reactor, wherein, the higher harmonic current that described linked reactor produces for filtering change of current chain, described linked reactor is placed in the two ends of each single-phase chain static synchronous compensator, between three single-phase chain static synchronous compensators, triangle connects, and described triangle connection is specially: three circuit that are comprised of reactor and single-phase chain static synchronous compensator head and the tail links successively.
6. the STATCOM based on three level H-bridge cascade connections according to claim 5, it is characterized in that, also comprise cooling system, lightning arrester, precharge loop, wherein, described cooling system is cooling for STATCOM change of current chain and linked reactor; Described lightning arrester and single-phase chain static synchronous compensator are connected in parallel, and described lightning arrester is for realizing the overvoltage protection of single-phase chain static synchronous compensator; Connecting with single-phase chain static synchronous compensator in described precharge loop, when described precharge loop is used for realizing STATCOM and powers on, DC side energy storage capacitor is carried out to precharge.
7. the STATCOM based on three level H-bridge cascade connections, it is characterized in that, comprise a plurality of single-phase chain static synchronous compensators claimed in claim 4 and a plurality of linked reactor, wherein, the higher harmonic current that described linked reactor produces for filtering change of current chain, described linked reactor is placed in one end that described single-phase chain static synchronous compensator is connected with grid side, Y-connection between three single-phase chain static synchronous compensators, described Y-connection is specially: an end of three disconnected described linked reactors of single-phase chain static synchronous compensator is connected on a common node.
8. the STATCOM based on three level H-bridge cascade connections according to claim 7, it is characterized in that, also comprise cooling system, lightning arrester, precharge loop, wherein, described cooling system is cooling for STATCOM change of current chain and linked reactor; Described lightning arrester and single-phase chain static synchronous compensator are connected in parallel, and described lightning arrester is for realizing the overvoltage protection of single-phase chain static synchronous compensator; Connecting with single-phase chain static synchronous compensator in described precharge loop, when described precharge loop is used for realizing STATCOM and powers on, DC side energy storage capacitor is carried out to precharge.
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|---|---|---|---|
| CN201320406950.5U CN203399013U (en) | 2013-07-09 | 2013-07-09 | Static synchronous compensator based on three-level H bridge cascade and voltage source inversion module |
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| CN201320406950.5U CN203399013U (en) | 2013-07-09 | 2013-07-09 | Static synchronous compensator based on three-level H bridge cascade and voltage source inversion module |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401462A (en) * | 2013-07-09 | 2013-11-20 | 上海交通大学 | Static synchronous compensator cascaded based on three-level H bridge and voltage source inverter module |
| CN104601025B (en) * | 2015-01-15 | 2017-04-12 | 燕山大学 | Three phase buck-boost type three level inverter |
| CN107546995A (en) * | 2017-01-17 | 2018-01-05 | 湖南大学 | A kind of electromagnetic agitation multi-level inverse conversion power supply and its control method |
| CN107947613A (en) * | 2018-01-02 | 2018-04-20 | 清华大学 | A kind of high-voltage large-capacity modularization multi-level converter based on IGCT |
| CN110165685A (en) * | 2018-02-11 | 2019-08-23 | 中国移动通信集团设计院有限公司 | A kind of batteries to store energy inverter and its control method |
| WO2021051315A1 (en) * | 2019-09-18 | 2021-03-25 | 西门子股份公司 | Modular multilevel converter and discharge method therefor |
-
2013
- 2013-07-09 CN CN201320406950.5U patent/CN203399013U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401462A (en) * | 2013-07-09 | 2013-11-20 | 上海交通大学 | Static synchronous compensator cascaded based on three-level H bridge and voltage source inverter module |
| CN103401462B (en) * | 2013-07-09 | 2016-02-10 | 上海交通大学 | Based on the single-phase chain static synchronous compensator of three level H bridge cascade |
| CN104601025B (en) * | 2015-01-15 | 2017-04-12 | 燕山大学 | Three phase buck-boost type three level inverter |
| CN107546995A (en) * | 2017-01-17 | 2018-01-05 | 湖南大学 | A kind of electromagnetic agitation multi-level inverse conversion power supply and its control method |
| CN107947613A (en) * | 2018-01-02 | 2018-04-20 | 清华大学 | A kind of high-voltage large-capacity modularization multi-level converter based on IGCT |
| CN110165685A (en) * | 2018-02-11 | 2019-08-23 | 中国移动通信集团设计院有限公司 | A kind of batteries to store energy inverter and its control method |
| CN110165685B (en) * | 2018-02-11 | 2020-12-04 | 中国移动通信集团设计院有限公司 | Storage battery energy storage inverter and control method thereof |
| WO2021051315A1 (en) * | 2019-09-18 | 2021-03-25 | 西门子股份公司 | Modular multilevel converter and discharge method therefor |
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