CN107294114A - SVG universal control methods under a kind of multiple topology based on phse conversion - Google Patents

SVG universal control methods under a kind of multiple topology based on phse conversion Download PDF

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CN107294114A
CN107294114A CN201710600935.7A CN201710600935A CN107294114A CN 107294114 A CN107294114 A CN 107294114A CN 201710600935 A CN201710600935 A CN 201710600935A CN 107294114 A CN107294114 A CN 107294114A
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CN107294114B (en
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陆佳政
朱思国
李波
谭艳军
刘文华
韩英铎
赵香花
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State Grid Corp of China SGCC
State Grid Hunan Electric Power Co Ltd
Disaster Prevention and Mitigation Center of State Grid Hunan Electric Power Co Ltd
Hunan Xiangdian Test Research Institute Co Ltd
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State Grid Corp of China SGCC
State Grid Hunan Electric Power Co Ltd
Disaster Prevention and Mitigation Center of State Grid Hunan Electric Power Co Ltd
Hunan Xiangdian Test Research Institute Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention discloses SVG universal control methods under a kind of multiple topology based on phse conversion, step includes：Device electric current is transformed to by low-pressure side from high-pressure side according to different topological structures, load current is transformed into device current in phase position benchmark, system voltage is synchronously transformed to consistent with device output voltage, according to different topological structure selection residual voltages or the alternate dc-voltage balances of zero-sequence current control SVG, conversion is normalized to three-phase reference voltage and obtains normalized reference voltage, normalized reference voltage progress phase-shifting carrier wave is obtained into the pulse signal for controlling power model more afterwards, by output of pulse signal value SVG power model.The present invention has taken into full account the situation of a variety of topological access ways of SVG site of deployment, the a variety of topological access ways of SVG site of deployment can be applied to, versatility and good environmental adaptability, debugging efficiency is high, management service cost is low, and SVG General design reduces the risk that engineering customizes SVG field upgrades.

Description

SVG universal control methods under a kind of multiple topology based on phse conversion
Technical field
The present invention relates to the electric network reactive compensation technology of electrical engineering, and in particular to a kind of more topological based on phse conversion SVG universal control methods under structure.
Background technology
After reactive-load compensation equipment access network system, the power factor of circuit can be improved, the qualified level of voltage is adjusted, reduced Voltage pulsation, strengthens the stability of line voltage.Traditional fixed capacity device group and reactor group switching interval is long, action impact Greatly, it is impossible to continuously adjust；The reactive-load compensation equipment occupation of land of SVC types is larger, and harmonic wave is big；SVG is mended as the dynamic reactive of a new generation Equipment is repaid, compared with traditional fixed compensation equipment and SVC, fast response time, occupation of land is small, can flexibly continuously adjust, at present Through being widely applied wind power plant, power network, metallurgy etc. are commercially available.In different application scenarios, the connection of SVG access systems Mode is different, and SVG can be directly incorporated into power network through connecting reactance；If it is too high to access voltage class, can be through Yy12 transformers Or Dyn11 transformers access power network；In some special application scenarios, such as live existing ice-melt transformer is Yd11 classes Type, SVG is also required to adapt to its change when accessing power network by it.When SVG accesses power network through transformer, SVG output voltage width Degree and access point voltage amplitude are often inconsistent, when especially by Dyn11 or Yd11 transformers, the voltage and electricity of SVG outputs The phase of stream is also changed compared with system.In addition, for SVG main circuits, thering is star to connect and being connect with corner connection two ways, star When SVG output voltage it is relatively low, electric current is larger, and imbalance compensation is limited in one's ability, during corner connection SVG export voltage it is higher, electric current It is smaller, with imbalance compensation ability.SVG is essentially equivalent to a width as a kind of inverter based on voltage Source Type The controllable voltage source that degree and phase can be adjusted, its output voltage needs the system voltage of moment and access power network to keep synchronous, Therefore, under different types of attachment and main circuit structure, the phase and amplitude of SVG device Bulk output voltage needs corresponding adjust It is whole, to ensure that device normally absorbs and sent reactive power.
The content of the invention
The technical problem to be solved in the present invention is：Above mentioned problem for prior art there is provided one kind can adapt to difference The general controls of SVG under the multiple topology based on phse conversion that control needs under transformer access way and different main circuit structures Method processed.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of SVG universal control methods under multiple topology based on phse conversion, implementation steps include：
1) access way of main circuit structure is set；
2) current sample is carried out for SVG, the three-phase installation electricity for sampling being obtained according to the access way of main circuit structure Phse conversion is flowed to high-pressure side；
3) system voltage sampling is carried out, the obtained system line voltage that will sample is synchronous as synchronous voltage of transformation benchmark Angle；
4) load current sampling is carried out for SVG, is born the three-phase that sampling is obtained according to the access way of main circuit structure Charged current is transformed to and the same benchmark of three-phase installation current phase；
5) to the load current after conversion, the reactive component for needing to compensate is calculated with the synchro angle, and according to synchro angle Conversion generation three-phase reference current；
6) on the basis of three-phase reference current is obtained, residual voltage is used according to the selection of the access way of main circuit structure Or zero-sequence current controls SVG alternate balance, obtains the three-phase reference voltage of the alternate balance for controlling SVG；
7) conversion is normalized to three-phase reference voltage and obtains normalized reference voltage；
8) normalized reference voltage progress phase-shifting carrier wave is obtained into the pulse signal for controlling power model more afterwards, By output of pulse signal value SVG power model.
Preferably, step 2) in become according to will sample obtained three-phase installation current phase of the access way of main circuit structure When changing to high-pressure side, SVG is met through Dyn11 transformers or Yd11 transformers access system if the access way of main circuit structure is star System, then transform to high-pressure side, obtained three-phase installation of otherwise sampling according to formula (1) by the three-phase installation current phase that sampling is obtained Current phase is identical with high-pressure side phase and without conversion；The star connect SVG refer to SVG A phases, B phases and C phases bridge arm share in Point is in star-like；
In formula (1), Ia0、Ib0、Ic0It is to carry out the three-phase installation electric current that SVG current samples are obtained, Ia、Ib、IcIt is SVG phases Transform to the three-phase installation electric current behind high-pressure side.
Preferably, step 4) in arrived according to will sample obtained three-phase load current transformation of the access way of main circuit structure During with the same benchmark of three-phase installation current phase, if the access way of main circuit structure, which is star, meets SVG through Dyn11 transformers Or during Yd11 transformer access systems, then arrive electric with three-phase installation according to will sample obtained three-phase load current transformation of formula (2) Flow the same benchmark of phase；Otherwise, the obtained load current of sampling transform to it is identical with three-phase installation current phase benchmark need not Conversion；The star meets SVG and refers to that SVG A phases, B phases and C phases bridge arm share midpoint in star-like；
In formula (2), Ila0、Ilb0And Ilc0It is to carry out the three-phase load electric current that load current sampling is obtained, I for SVGla、 IlbAnd IlcIt is to transform to and the three-phase load electric current after the same benchmark of three-phase installation current phase.
Preferably, step 6) in detailed step include：
6.1) access way of main circuit structure is checked, if the access way of main circuit structure, which is star, meets SVG through Dyn11 Or YD11 transformer access systems, or during SVG corner connections, redirect execution step 6.2)；If the access way of main circuit structure is Star connects SVG direct screening or during through YY transformer access systems, redirects execution step 6.3)；
6.2) zero-sequence current of the alternate balance for controlling SVG is calculated, obtained zero-sequence current is superimposed upon three coherents Examine in electric current, then enter the three-phase reference current being superimposed after zero-sequence current and phse conversion on high-tension side three-phase installation electric current Row transient current tracing, obtains the three-phase reference voltage of the alternate balance for controlling SVG；Redirect execution step 7)；
6.3) residual voltage of the alternate balance for controlling SVG is calculated, obtained residual voltage is superimposed upon three coherents Examine in voltage, obtain the three-phase reference voltage of the alternate balance for controlling SVG；Redirect execution step 7).
Preferably, step 6.2) in calculate alternate balance for controlling SVG zero-sequence current function expression such as formula (3) shown in；
In formula (3), I0For the zero-sequence current of the alternate balance for controlling SVG, Pa、Pb、PcRespectively control alternate balance When A, B, C three-phase each required power, UrmsThe virtual value of voltage is accessed for SVG.
Preferably, step 6.3) in calculate alternate balance for controlling SVG residual voltage function expression such as formula (4) shown in；
In formula (4), U0For the residual voltage of the alternate balance for controlling SVG, PaA phases when respectively controlling alternate balance Required power, IaFor the amplitude of SVG A phase output currents,For the phase of SVG A phase output currents,For residual voltage Phase.
Preferably, step 7) three-phase reference voltage is normalized the function table that conversion obtains normalized reference voltage Up to formula such as formula (5) Suo Shi；
In formula (5), UrefFor the reference voltage after normalization, Uref0For the reference voltage before normalization, UpFor SVG device Rated voltage, UsVoltage, U are accessed for SVG devicedcFor SVG device DC voltage.
SVG universal control methods tool has the advantage that under multiple topology of the invention based on phse conversion：
1st, SVG universal control methods are carried out according to different topology structure under the multiple topology of the invention based on phse conversion The conversion of device electric current, the conversion of load current, selection, the conversion of zero-sequence current and residual voltage and the final ginseng of synchronizing voltage The normalized of voltage is examined, device electric current is transformed to by high-pressure side from low-pressure side according to different topological structures, amplitude is unified Conversion.Specifically, i.e., when SVG is through transformer access system, the no-load voltage ratio of transformer is not considered first, transformer voltage ratio is equivalent For 1：1, device electric current is transformed into high-pressure side, then the unified no-load voltage ratio for considering transformer from low-pressure side according to various topological structures, The unified conversion in amplitude, in the case where the basic control algolithm strategies of SVG are constant, realize SVG by the control method and calculates The versatility of method, with following beneficial effects：1) situation of a variety of topological access ways of SVG site of deployment has been taken into full account, should Control method is adapted to the voltage device access of a variety of groups, and suitable star connects the main circuit structure with corner connection；2) become by parameter setting Depressor type and main circuit structure can just realize this method, greatly strengthen SVG versatility and environmental suitability；3) improve SVG debugging efficiency, reduces management service cost, and SVG General design reduces engineering customization SVG field upgrades Risk.
2nd, SVG universal control methods can be applied to a variety of topology knots under the multiple topology of the invention based on phse conversion Structure, including：1) star connects SVG direct screening access systems；2) corner connection SVG direct screening access system；3) star meets SVG and accessed through Yy12 transformers System；4) star meets SVG through Dyn11 transformer access systems；5) star meets SVG through Yd11 transformer access systems, and its culminant star meets SVG It is in star-like to refer to that SVG A phases, B phases and C phases bridge arm share midpoint, and corner connection SVG refers to SVG A phases, B phases and C phases bridge arm head and the tail Connect in corner connection.
Brief description of the drawings
Fig. 1 meets SVG through Yd11 transformer access system schematic diagrames for the star of prior art.
Fig. 2 is the basic principle schematic of present invention method.
Fig. 3 connects SVG principle schematic for the star of prior art.
Fig. 4 is the corner connection SVG of prior art principle schematic.
Fig. 5 meets SVG through Yy12 transformer access system schematic diagrames for the star of prior art.
Fig. 6 meets SVG through Dyn11 transformer access system schematic diagrames for the star of prior art.
Embodiment
Exemplified by SVG hereafter will be met through Yd11 transformer access systems by the star in Fig. 1, phse conversion is based on to the present embodiment Multiple topology under SVG universal control methods be described in further detail.SVG is met referring to the star in Fig. 1 through Yd11 to become Depressor access system, one end that star connects SVG tri- bridge arms of A, B, C is connected with three terminals of transformer secondary respectively, three The other end of bridge arm links together.The analog quantity of SVG device collection includes：The three-phase system line voltage of transformer primary side, three Phase system electric current, three-phase load electric current, the three-phase current of SVG device output.When SVG is operated in load compensation pattern, such as Fig. 2 institutes Show, the implementation steps of SVG universal control methods include under multiple topology of the present embodiment based on phse conversion：
1) access way sets main circuit to set：The access way of main circuit structure is set；
2) device current phase is converted：Current sample is carried out for SVG, will be sampled according to the access way of main circuit structure Obtained three-phase installation current phase transforms to high-pressure side；
3) synchronizing voltage phse conversion：System voltage sampling is carried out, the system line voltage that sampling is obtained is used as synchronous become Change voltage reference and calculate synchro angle；
4) load current phse conversion：Load current sampling is carried out for SVG, will according to the access way of main circuit structure Sample obtained three-phase load current transformation to the same benchmark of three-phase installation current phase；
5) it is synchronous to calculate and control：To the load current after conversion, idle point that needs to compensate is calculated with the synchro angle Amount, and three-phase reference current is generated according to synchronous angular transformation；
6) transient current control：On the basis of three-phase reference current is obtained, selected according to the access way of main circuit structure The alternate balance that SVG is controlled using residual voltage or zero-sequence current is selected, the three-phase reference of the alternate balance for controlling SVG is obtained Voltage；
7) this calculation of reference voltage and normalized：Conversion is normalized to three-phase reference voltage and obtains normalized ginseng Examine voltage；
8) phase-shifting carrier wave PWM：Normalized reference voltage is carried out to obtain being used to control power mould after phase-shifting carrier wave The pulse signal of block, by output of pulse signal value SVG power model.
In the present embodiment, step 1) when the access way of main circuit structure is set, specific design interface parameter is settable to be become Depressor access way, optional direct screening, YY boostings, Dyn11, Yd11；Main circuit structure can be set in design interface parameter：Optional star Connect, corner connection.SVG work is allowed in different modes by parameter setting.
In the present embodiment, step 2) according to the access way of main circuit structure by obtained three-phase installation electric current phase of sampling When bit map is to high-pressure side, connect if the access way of main circuit structure meets SVG for star through Dyn11 transformers or Yd11 transformers Enter system, then the three-phase installation current phase that sampling is obtained is transformed to by high-pressure side according to formula (1), obtained three-phase of otherwise sampling Device current phase is identical with high-pressure side phase and without conversion；The star meets SVG and refers to that SVG A phases, B phases and C phases bridge arm are total to With midpoint in star-like, as shown in Figure 3；
In formula (1), Ia0、Ib0、Ic0It is to carry out the three-phase installation electric current that SVG current samples are obtained, Ia、Ib、IcIt is SVG phases Transform to the three-phase installation electric current behind high-pressure side.In amplitude during unified conversion, using device rated voltage and access voltage Ratio is uniformly processed, if device is direct screening, and rated voltage is consistent with access voltage；If device is to be connect using connection transformer Enter, then again by device electric current divided by access voltage and the ratio of device rated voltage.
In the present embodiment, synchronizing voltage is transformed to according to different topological structures identical with SVG device output voltage Phase.Specifically, when star meets SVG through Dyn11 or YD11 transformer access systems, or during SVG corner connections, using line voltage conduct Synchronizing voltage benchmark；When star connects SVG direct screening or during through YY transformer access systems, synchronizing voltage benchmark is used as using phase voltage. In the present embodiment, step 4) in obtained three-phase load current transformation will be sampled to three according to the access way of main circuit structure During the same benchmark of phase device current phase, if the access way of main circuit structure is star connect SVG through Dyn11 transformers or During Yd11 transformer access systems, then according to formula (2) will sample obtained three-phase load current transformation to three-phase installation electric current The same benchmark of phase；Otherwise, the load current that sampling is obtained transforms to identical with three-phase installation current phase benchmark without turning Change；The star meets SVG and refers to that SVG A phases, B phases and C phases bridge arm share midpoint in star-like, as shown in Figure 3；Corner connection SVG refers to SVG A phases, B phases and C phase bridge arms it is end to end be in corner connection, as shown in Figure 4；
In formula (2), Ila0、Ilb0And Ilc0It is to carry out the three-phase load electric current that load current sampling is obtained, I for SVGla、 IlbAnd IlcIt is to transform to and the three-phase load electric current after the same benchmark of three-phase installation current phase.System power subtracts conversion Device electric current afterwards, can obtain equivalent load current；The load current is entered into line translation, then using obtained synchronizing voltage as Benchmark is decomposed, and can obtain reactive load, the harmonious wave component of negative phase-sequence that SVG needs to compensate.
In the present embodiment, step 6) in detailed step include：
6.1) access way of main circuit structure is checked, if the access way of main circuit structure, which is star, meets SVG through Dyn11 Or YD11 transformer access systems, or during SVG corner connections, redirect execution step 6.2)；If the access way of main circuit structure is Star connects SVG direct screening or during through YY transformer access systems, redirects execution step 6.3)；
6.2) zero-sequence current of the alternate balance for controlling SVG is calculated, obtained zero-sequence current is superimposed upon three coherents Examine in electric current, then enter the three-phase reference current being superimposed after zero-sequence current and phse conversion on high-tension side three-phase installation electric current Row transient current tracing, obtains the three-phase reference voltage of the alternate balance for controlling SVG；Redirect execution step 7)；
6.3) residual voltage of the alternate balance for controlling SVG is calculated, obtained residual voltage is superimposed upon three coherents Examine in voltage, obtain the three-phase reference voltage of the alternate balance for controlling SVG；Redirect execution step 7).
In the present embodiment, according to different topological structures, selection controls SVG using the method for residual voltage or zero-sequence current Alternate balance.When star meets SVG through Dyn11 or YD11 transformer access systems, or during SVG corner connections, added in reference voltage Zero-sequence current；When star connects SVG direct screening or during through YY transformer access systems, residual voltage is added in reference voltage.Step 6.2) shown in the function expression such as formula (3) for the zero-sequence current that alternate balance for controlling SVG is calculated in；
In formula (3), I0For the zero-sequence current of the alternate balance for controlling SVG, Pa、Pb、PcRespectively control alternate balance When A, B, C three-phase each required power, UrmsThe virtual value of voltage is accessed for SVG.
In the present embodiment, step 6.3) in calculate alternate balance for controlling SVG residual voltage function expression As shown in formula (4)；
In formula (4), U0For the residual voltage of the alternate balance for controlling SVG, PaA phases when respectively controlling alternate balance Required power, IaFor the amplitude of SVG A phase output currents,For the phase of SVG A phase output currents,For residual voltage Phase.Obtained, purpose according to the alternate relativeness for balancing each required power and three-phase output current of control three-phase It is that the power that residual voltage is produced with the function of current is offset with required power.
In the present embodiment, step 7) three-phase reference voltage is normalized the letter that conversion obtains normalized reference voltage Shown in number expression formula such as formula (5)；
In formula (5), UrefFor the reference voltage after normalization, Uref0For the reference voltage before normalization, UpFor SVG device Rated voltage, UsVoltage, U are accessed for SVG devicedcFor SVG device DC voltage.
When SVG is using other main circuit connected modes or by other transformer connection mode access systems, step is same On, different mapping modes are selected according to different topological structures in electric quantity change.
In summary, under multiple topology of the present embodiment based on phse conversion SVG universal control methods according to different Device electric current is transformed to low-pressure side by topological structure from high-pressure side, and load current is transformed into device current in phase position benchmark, will System voltage is synchronously transformed to consistent with device output voltage, and residual voltage or zero-sequence current are selected according to different topological structure The dc-voltage balance for controlling SVG alternate, reference voltage is normalized, and different access ways and main electricity can be set Line structure.The multiple topology that the universal control method is adapted to includes：1) star connects SVG direct screening access systems, as shown in Figure 3； 2) corner connection SVG direct screening access system, as shown in Figure 4；3) star meets SVG through Yy12 transformer access systems, as shown in Figure 5；4) star SVG is met through Dyn11 transformer access systems, as shown in Figure 6；5) star meets SVG through Yd11 transformer access systems.The present invention's has Beneficial effect is：1) situation of a variety of topological access ways of SVG site of deployment has been taken into full account, the control method is adapted to a variety of groups Voltage device access, suitable star connects the main circuit structure with corner connection；2) parameter setting transformer type and main circuit structure are passed through This method can be just realized, SVG versatility and environmental suitability is greatly strengthen；3) SVG debugging efficiency is improved, is reduced Management service cost, SVG General design reduces the risk that engineering customizes SVG field upgrades.The present embodiment is based on phase SVG universal control methods are that SVG is provided under a variety of main wiring modes and main circuit structure under the multiple topology of bit map A kind of general control method, enhances SVG applicability, improves debugging efficiency.
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications It should be regarded as protection scope of the present invention.

Claims (7)

1. SVG universal control methods under a kind of multiple topology based on phse conversion, it is characterised in that implementation steps include：
1) access way of main circuit structure is set；
2) current sample is carried out for SVG, the three-phase installation electric current phase for sampling being obtained according to the access way of main circuit structure Bit map is to high-pressure side；
3) system voltage sampling is carried out, the system line voltage that sampling is obtained is used as synchronous voltage of transformation benchmark synchro angle；
4) load current sampling is carried out for SVG, the three-phase load electricity for sampling being obtained according to the access way of main circuit structure Rheology is changed to and the same benchmark of three-phase installation current phase；
5) to the load current after conversion, the reactive component for needing to compensate is calculated with the synchro angle, and according to synchronous angular transformation Generate three-phase reference current；
6) on the basis of three-phase reference current is obtained, residual voltage or zero are used according to the selection of the access way of main circuit structure Sequence current control SVG alternate balance, obtains the three-phase reference voltage of the alternate balance for controlling SVG；
7) conversion is normalized to three-phase reference voltage and obtains normalized reference voltage；
8) normalized reference voltage progress phase-shifting carrier wave is obtained into the pulse signal for controlling power model more afterwards, by arteries and veins Rush signal value output SVG power model.
2. SVG universal control methods under the multiple topology according to claim 1 based on phse conversion, its feature exists In step 2) in high-pressure side is transformed to according to will sample obtained three-phase installation current phase of the access way of main circuit structure When, if the access way of main circuit structure, which is star, meets SVG through Dyn11 transformers or Yd11 transformer access systems, basis The three-phase installation current phase that sampling is obtained is transformed to high-pressure side by formula (1), obtained three-phase installation current phase of otherwise sampling It is identical with high-pressure side phase and without conversion；It is in star that the star, which meets SVG to refer to that SVG A phases, B phases and C phases bridge arm share midpoint, Type；
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In formula (1), Ia0、Ib0、Ic0It is to carry out the three-phase installation electric current that SVG current samples are obtained, Ia、Ib、IcIt is SVG phse conversions Three-phase installation electric current after to high-pressure side.
3. SVG universal control methods under the multiple topology according to claim 1 based on phse conversion, its feature exists In step 4) in arrive electric with three-phase installation according to will sample obtained three-phase load current transformation of the access way of main circuit structure When flowing the same benchmark of phase, if the access way of main circuit structure, which is star, meets SVG through Dyn11 transformers or Yd11 transformers During access system, then obtained three-phase load current transformation will be sampled to same with three-phase installation current phase according to formula (2) Benchmark；Otherwise, the load current that sampling is obtained transforms to identical with three-phase installation current phase benchmark without conversion；The star connects SVG refers to that SVG A phases, B phases and C phases bridge arm share midpoint in star-like；
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>l</mi> <mi>a</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <mn>2</mn> <msub> <mi>I</mi> <mrow> <mi>l</mi> <mi>a</mi> <mn>0</mn> </mrow> </msub> </mrow> <msqrt> <mn>3</mn> </msqrt> </mfrac> <mo>+</mo> <mfrac> <msub> <mi>I</mi> <mrow> <mi>l</mi> <mi>c</mi> <mn>0</mn> </mrow> </msub> <msqrt> <mn>3</mn> </msqrt> </mfrac> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>l</mi> <mi>b</mi> </mrow> </msub> <mo>=</mo> <mo>-</mo> <mfrac> <mrow> <mn>2</mn> <msub> <mi>I</mi> <mrow> <mi>l</mi> <mi>a</mi> <mn>0</mn> </mrow> </msub> </mrow> <msqrt> <mn>3</mn> </msqrt> </mfrac> <mo>-</mo> <mfrac> <msub> <mi>I</mi> <mrow> <mi>l</mi> <mi>b</mi> <mn>0</mn> </mrow> </msub> <msqrt> <mn>3</mn> </msqrt> </mfrac> <mo>-</mo> <mfrac> <mrow> <mn>3</mn> <msub> <mi>I</mi> <mrow> <mi>l</mi> <mi>c</mi> <mn>0</mn> </mrow> </msub> </mrow> <msqrt> <mn>3</mn> </msqrt> </mfrac> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>l</mi> <mi>c</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <mn>2</mn> <msub> <mi>I</mi> <mrow> <mi>l</mi> <mi>c</mi> <mn>0</mn> </mrow> </msub> </mrow> <msqrt> <mn>3</mn> </msqrt> </mfrac> <mo>+</mo> <mfrac> <msub> <mi>I</mi> <mrow> <mi>l</mi> <mi>b</mi> <mn>0</mn> </mrow> </msub> <msqrt> <mn>3</mn> </msqrt> </mfrac> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
In formula (2), Ila0、Ilb0And Ilc0It is to carry out the three-phase load electric current that load current sampling is obtained, I for SVGla、IlbWith IlcIt is to transform to and the three-phase load electric current after the same benchmark of three-phase installation current phase.
4. SVG universal control methods under the multiple topology according to claim 1 based on phse conversion, its feature exists In step 6) in detailed step include：
6.1) check the access way of main circuit structure, if the access way of main circuit structure is star connect SVG through Dyn11 or YD11 transformer access systems, or during SVG corner connections, redirect execution step 6.2)；If the access way of main circuit structure is star Connect SVG direct screening or during through YY transformer access systems, redirect execution step 6.3)；
6.2) zero-sequence current of the alternate balance for controlling SVG is calculated, obtained zero-sequence current is superimposed upon three-phase with reference to electricity In stream, the three-phase reference current being superimposed after zero-sequence current and phse conversion are then subjected to wink on high-tension side three-phase installation electric current When current tracking, obtain the three-phase reference voltage of the alternate balance for controlling SVG；Redirect execution step 7)；
6.3) residual voltage of the alternate balance for controlling SVG is calculated, obtained residual voltage is superimposed upon three-phase with reference to electricity In pressure, the three-phase reference voltage of the alternate balance for controlling SVG is obtained；Redirect execution step 7).
5. SVG universal control methods under the multiple topology according to claim 4 based on phse conversion, its feature exists In step 6.2) in calculate alternate balance for controlling SVG zero-sequence current function expression such as formula (3) shown in；
<mrow> <msub> <mi>I</mi> <mn>0</mn> </msub> <mo>=</mo> <mfrac> <msub> <mi>P</mi> <mi>a</mi> </msub> <msub> <mi>U</mi> <mrow> <mi>r</mi> <mi>m</mi> <mi>s</mi> </mrow> </msub> </mfrac> <mo>+</mo> <mi>j</mi> <mfrac> <mrow> <msub> <mi>P</mi> <mi>c</mi> </msub> <mo>-</mo> <msub> <mi>P</mi> <mi>b</mi> </msub> </mrow> <mrow> <msqrt> <mn>3</mn> </msqrt> <msub> <mi>U</mi> <mrow> <mi>r</mi> <mi>m</mi> <mi>s</mi> </mrow> </msub> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow>
In formula (3), I0For the zero-sequence current of the alternate balance for controlling SVG, Pa、Pb、PcA when respectively controlling alternate balance, B, C three-phase each required power, UrmsThe virtual value of voltage is accessed for SVG.
6. SVG universal control methods under the multiple topology according to claim 4 based on phse conversion, its feature exists In step 6.3) in calculate alternate balance for controlling SVG residual voltage function expression such as formula (4) shown in；
In formula (4), U0For the residual voltage of the alternate balance for controlling SVG, PaWhen respectively controlling alternate balance needed for a phases Power, IaFor the amplitude of SVG A phase output currents,For the phase of SVG A phase output currents,For the phase of residual voltage Position.
7. SVG general controls sides under the multiple topology based on phse conversion according to any one in claim 1~6 Method, it is characterised in that step 7) three-phase reference voltage is normalized the function table that conversion obtains normalized reference voltage Up to formula such as formula (5) Suo Shi；
<mrow> <msub> <mi>U</mi> <mrow> <mi>r</mi> <mi>e</mi> <mi>f</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>U</mi> <mrow> <mi>r</mi> <mi>e</mi> <mi>f</mi> <mn>0</mn> </mrow> </msub> <mfrac> <msub> <mi>U</mi> <mi>p</mi> </msub> <mrow> <msub> <mi>U</mi> <mi>s</mi> </msub> <msub> <mi>U</mi> <mrow> <mi>d</mi> <mi>c</mi> </mrow> </msub> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>5</mn> <mo>)</mo> </mrow> </mrow>
In formula (5), UrefFor the reference voltage after normalization, Uref0For the reference voltage before normalization, UpIt is specified for SVG device Voltage, UsVoltage, U are accessed for SVG devicedcFor SVG device DC voltage.
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