CN103986342B - A kind of power electronics inverter that can remove bi-directional failure electric current and control method - Google Patents

A kind of power electronics inverter that can remove bi-directional failure electric current and control method Download PDF

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Publication number
CN103986342B
CN103986342B CN201410234085.XA CN201410234085A CN103986342B CN 103986342 B CN103986342 B CN 103986342B CN 201410234085 A CN201410234085 A CN 201410234085A CN 103986342 B CN103986342 B CN 103986342B
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current
inverter
brachium pontis
change
power modules
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CN103986342A (en
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赵东元
邱宇峰
荆平
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State Grid Corp of China SGCC
Smart Grid Research Institute of SGCC
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State Grid Corp of China SGCC
Smart Grid Research Institute of SGCC
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Abstract

The invention provides a kind of power electronics inverter that can remove bi-directional failure electric current and control method, inverter includes the change of current brachium pontis connected by reactor, and change of current brachium pontis includes the T-shaped power modules being connected in series;Two horizontal ends of T-shaped power modules are connected with the vertical end of another T-shaped power modules after being connected by electric capacity;It is sequentially connected by vertical end, reactor and horizontal ends between change of current brachium pontis;Submodule controller, the optical fiber current mutual inductor of change of current brachium pontis are all connected with converter bridge arm controller by optical fiber, and converter bridge arm controller is connected with inverter master controller.Described method carries out twin failure current protection by the drive circuit of wholly-controled device and the electric current detecting method of change of current brachium pontis to power electronics inverter.Compared with prior art, the present invention provide a kind of power electronics inverter that can remove bi-directional failure electric current and control method, it is possible to fast and effectively excision bi-directional failure electric current.

Description

A kind of power electronics inverter that can remove bi-directional failure electric current and control method
Technical field
The present invention relates to a kind of power electronics inverter and control method, be specifically related to a kind of electricity that can remove bi-directional failure electric current Power electronic inverter and control method.
Background technology
Technology of HVDC based Voltage Source Converter and Survey of Flexible AC Transmission System Technology play day by day in intelligent grid construction and field of new energy generation Important effect;Owing in power system, short trouble is the most serious damage, thereby, it is ensured that flexible DC power transmission and Survey of Flexible AC Transmission System properly functioning, needs to remove short trouble by power electronics inverter;Divide based on principle, change of current stream Device processes short-circuit current and includes:
1.: utilize inverter alternating current-direct current side other equipment (such as AC and DC chopper) isolated fault point;
Wherein, dc circuit breaker is not yet widely recognized in HVDC field and applies;AC circuit breaker is due to mechanical switch Response is relatively slow, and the fast motion time is 40-60ms, is difficult to the fast transient process of response power electronic system Millisecond, and Repeatedly cut-off the life-span that can shorten AC circuit breaker.Such as, in prior art, flexible DC power transmission engineering is cut by AC circuit breaker During disconnected fault current, each DC side fault all can cause flexible direct current power transmission system to stop transport, seriously respond system availability.
2.: utilize the removing of inverter self control realization fault current;
Power electronics inverter is generally combined by one or more power modules, and therefore the performance of inverter directly depends on The performance of the power modules used.In prior art, the power electronics inverter of flexible direct-current transmission field typically uses two electricity Flat inverter or modularization multi-level converter etc..Wherein, two level converters mainly use bridge-type topology;How electric modularity is The power cell that flat inverter uses includes the multiple power submodules such as bridge-type submodule, semi-bridge type submodule or clamp Shuangzi module Block:
When Converter DC-side is short-circuited fault, bridge-type submodule (with two level converters) can be cut off by locking The electric current of twocouese, it require that the semiconductor device of double amount, invests excessive;Semi-bridge type submodule, due to itself and IGBT The antiparallel diode of device can constitute the energy feedback that trouble point and AC system be joined directly together and flow back to road and uncontrollable, the most not Possesses DC current locking function;Clamp Shuangzi module, although the semiconductor device of employing is fewer than bridge-type sub modular structure, but Due to self topological structure, system clamps the electric capacity of Shuangzi module after locking and can repeatedly charge, and cuts off short circuit current institute The time needed is longer than bridge-type, and it is unsatisfactory that fault current controls effect.
Accordingly, because cannot limiting short-circuit current effectively, existing high-power electric and electronic inverter based on full-controlled device exists Easily there is stream locking or tripping operation during the system failure, seriously reduce the availability of device and the safety and stability level of power system. A kind of novel electric power electric inverter that can remove failures is provided to be particularly important.
Summary of the invention
In order to meet the needs of prior art, the invention provides a kind of power electronics inverter that can remove bi-directional failure electric current, Described inverter includes the change of current brachium pontis connected by reactor, and described change of current brachium pontis includes the T-shaped power modules being connected in series; A DC capacitor it is arranged in parallel between the horizontal ends of described T-shaped power modules;On submodule controller and described change of current brachium pontis Optical fiber current mutual inductor be all connected with converter bridge arm controller by optical fiber;Described change of current brachium pontis is connected with inverter master controller.
Preferably, three branch roads of described T-shaped power modules all include the wholly-controled device being connected in series;Described full-control type device Part uses any one in power electronic devices IGBT, IGCT and GTO;
Preferably, the horizontal ends of described T-shaped power modules includes the power electronic devices arranged in the same direction;Described T-shaped power Power electronic devices colelctor electrode in the vertical end of module is connected with the junction point of described horizontal ends;
Preferably, the T-shaped power modules in described change of current brachium pontis is sent out by the power electronic devices of described vertical end with horizontal ends Emitter-base bandgap grading is sequentially connected;Sent out by the power electronic devices of described vertical end, reactor and described horizontal ends between described change of current brachium pontis Emitter-base bandgap grading is sequentially connected;
Preferably, described T-shaped power modules connects the horizontal ends of vertical end and described perpendicular by power electronic devices colelctor electrode A by-pass switch in parallel between straight end;
Preferably, between described power electronic devices colelctor electrode and emitter stage, inverse parallel arranges a diode;
Preferably, the drive circuit of all wholly-controled device in described T-shaped power modules all by submodule controller with change Stream brachium pontis controller connects;
A kind of removing bi-directional failure current control method using above-mentioned power electronics inverter that the present invention provides, including:
Step 1: judge that power system DC side is short-circuited fault, locking inverter;
Step 2: after described converter blocking 200ms, inverter master controller issues unblock inverter instruction;And
Step 3: judge whether described inverter restarts;If restarting failure, then Permanent lockout inverter.
Preferably, in described step 1, locking inverter includes:
Optical fiber current mutual inductor detects the current signal flowing through change of current brachium pontis in real time, converter bridge arm controller by described current signal with Current threshold compares, thus judges that power system DC side is short-circuited fault;Described converter bridge arm controller is to submodule Controller issues the instruction of locking inverter;
Preferably, in described step 1, locking inverter includes:
Power system DC side is short-circuited after fault, the drive circuit action locking T-shaped power modules in change of current brachium pontis, from And excise the fault current of change of current brachium pontis;Described submodule controller sends locking T-shaped power to described converter bridge arm controller Module locking information.
Compared with immediate prior art, the excellent effect of the present invention is:
1, in technical solution of the present invention, T-shaped power modules based on wholly-controled device can excise two-way fault current, from And ensure that bi-directional failure electric current effectively removed by power electronics inverter;
2, in technical solution of the present invention, T-shaped power modules uses full control shape device disengagement failure electric current, fast response time, choosing Selecting property is good;
3, in technical solution of the present invention, change of current brachium pontis arranges optical fiber current mutual inductor, there is good broadband properties, do not exist Saturation problem, it is possible to fast detecting failure electric current, it is adaptable to flexible direct-current transmission field;
4, in technical solution of the present invention, electric to electric power by the drive circuit of wholly-controled device and the electric current detecting method of change of current brachium pontis Sub-inverter carries out twin failure current protection;
5, in technical solution of the present invention, the circulation using converter bridge arm controller to be capable of between change of current brachium pontis controls, T-shaped power The capacitor voltage balance of submodule controls and change of current brachium pontis fault-current protection function, and breakdown judge speed is fast, accuracy rate is high.
6, in technical solution of the present invention, use inverter master controller to realize the coordination control of inverter and power system, improve The safety and stability level of inverter and reliability.
Accompanying drawing explanation
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1 is: two level converter structure charts;
Fig. 2 is: MMC type modular multilevel converter structure figure;
Fig. 3 is: bridge-type sub modular structure figure;
Fig. 4 is: semi-bridge type sub modular structure figure;
Fig. 5 is: clamp Shuangzi function structure chart;
Fig. 6 is: fault paths figure during Converter DC-side short circuit;
Fig. 7 is: a kind of power electronics converter structure figure that can remove bi-directional failure electric current in the embodiment of the present invention;
Fig. 8 is: T-shaped sub modular structure figure in the embodiment of the present invention;
Fig. 9 is: the structure chart of single full-controlled device in T-shaped submodule shown in Fig. 8;
Figure 10 is: can remove the fault during power electronics Converter DC-side short circuit of bi-directional failure electric current in the embodiment of the present invention Path figure;
Figure 11 is: T-shaped submodule charging working state schematic representation in the embodiment of the present invention;
Figure 12 is: T-shaped submodule electric discharge working state schematic representation in the embodiment of the present invention;
Figure 13 is: T-shaped submodule bypass view in the embodiment of the present invention;
Figure 14 is: T-shaped submodule locking excision working state schematic representation in the embodiment of the present invention;
Figure 15 is: the power electronics inverter DC Line Fault that can remove bi-directional failure electric current in the embodiment of the present invention controls protection plan Sketch map.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most identical or Similar label represents same or similar element or has the element of same or like function.Describe below with reference to accompanying drawing Embodiment is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
Respectively illustrate in flexible direct-current transmission field, such as Fig. 1-2, two level converters generally used and how electric MMC type modularity is Flat converter structure figure, wherein the power cell in MMC type modularization multi-level converter can use bridge-type sub modular structure, Semi-bridge type sub modular structure and clamp Shuangzi modular structure, as in Figure 3-5, the voltage etc. of the bridge-type submodule shown in Fig. 3 Level is less than the electric pressure of two level converters shown in Fig. 1;
As shown in Figure 6 when Converter DC-side is short-circuited fault, two level converters or bridge-type submodule are cut by locking The electric current of disconnected twocouese, but need the semiconductor device of double amount, invest excessive;Due to electric with electric power in semi-bridge type submodule The antiparallel diode of sub-device can constitute the energy feedback that trouble point and AC system be joined directly together and flow back to road and uncontrollable, therefore Do not possesses DC current locking function;Clamp Shuangzi module its electric capacity after locking can charge repeatedly, and the short circuit current mute time is relatively Long, therefore fault current control effect is undesirable.
For overcoming power electronics inverter in prior art can not effectively remove the defect of fault current, the invention provides one such as Power electronics inverter shown in Fig. 7;
In the present embodiment, power electronics inverter is three-phase inverter, including six change of current brachium pontis, reactor, fibre-optic current mutual inductance Device, converter bridge arm controller and inverter master controller;Change of current brachium pontis is connected in series by reactor;Each change of current brachium pontis is installed There is optical fiber current mutual inductor;Converter bridge arm controller is directly connected with inverter master controller;
1.: inverter master controller, for realizing the stable operation coordination control of inverter and power system, to change of current brachium pontis control Device processed issues the instruction of change of current brachium pontis reference voltage;After power system dc-side short-circuit fault releases, issue unblock inverter refer to simultaneously Order
2.: converter bridge arm controller, for reference voltage instruction being converted to the switch triggering signal of each submodule, it is achieved the change of current Circulation between brachium pontis controls, the electric capacity of submodule, voltage balancing control;
Optical fiber current mutual inductor is for detecting the current signal in change of current brachium pontis, and is sent to change after being carried out photoelectric signal transformation Stream brachium pontis controller;Converter bridge arm controller carries out power system dc-side short-circuit fault judgement according to current signal, and issues and close Lock inverter instruction;
3.: submodule controller, it is used for receiving and parsing through switch triggering signal, is converted into the driving letter of power electronic devices Number;The running status of detection T-shaped power modules, is sent to converter bridge arm controller by running state information;When T-shaped power During submodule operation exception, submodule controller can power electronic devices in the locking T-shaped power modules of action in time, cut Change the running status of T-shaped power modules.
Change of current brachium pontis includes N number of T-shaped power modules SM1, SM2 ... SMN being connected in series;Each T-shaped power The structure of module as shown in Figure 8, including wholly-controled device, drive circuit, by-pass switch KsmWith T-shaped power modules;
1.: wholly-controled device uses any one in power electronic devices IGBT, IGCT and GTO, each full-control type device The colelctor electrode of part and the inverse parallel of emitter stage two ends arrange a diode D1, D2 ... DM;
2.: a change of current brachium pontis is arranged in parallel a DC capacitor between two horizontal ends of each T-shaped power modules;T The horizontal ends of shape power modules includes the power electronic devices arranged in the same direction;Electric power electricity in the vertical end of T-shaped power modules The colelctor electrode of sub-device is connected with the junction point of horizontal ends;
3.: the series system of T-shaped power modules is: a T-shaped power modules in change of current brachium pontis passes through vertical end with another The power electronic devices emitter stage of one T-shaped power modules horizontal ends is sequentially connected;
The connected mode of change of current brachium pontis is: between change of current brachium pontis by the vertical end of T-shaped power modules in a change of current brachium pontis, Reactor is sequentially connected with the power electronic devices emitter stage of the horizontal ends of T-shaped power modules in another change of current brachium pontis.
4.: drive circuit is connected with the gate pole of power electronic devices, drive circuit GU1, GU2 ... GUM;One T-shaped merit All drive circuits in rate submodule are connected with converter bridge arm controller after being all connected with a sub-module controller, submodule control Device SMC1 processed, SMC2 ... SMCN;This T-shaped power modules is connected the water of vertical end by wholly-controled device colelctor electrode A by-pass switch K in parallel between flush end and this vertical endsm;Three branch roads of T-shaped power modules all include the M being connected in series Individual full control shape device, as shown in Figure 9.
As shown in Figure 10, the power electronics inverter knot that can remove bi-directional failure electric current provided based on the present invention in the present embodiment The three-phase inverter of structure, its specific works process is:
When power system DC side normally works, in Figure 10, the power electronic devices on the vertical branch road of T-shaped power modules is normal Logical state, the power electronic devices in two horizontal branches is charged according to modulation strategy, discharges and bypasses;Power system During dc-side short-circuit fault, all electric power electric devices and diode in T-shaped power modules are shutoff, thus locking is changed Stream device;
Under indicate the modulation strategy of power electronic devices:
1.: pattern one;As shown in figure 11, power electronics inverter T in T-shaped submodule1And T2Turn off, diode D1And D3 Conducting, D2Turning off, electric capacity charges;
2.: pattern two;As shown in figure 12, power electronics inverter T in T-shaped submodule2Shutoff, T1Conducting, diode D3 Conducting, D1And D2Turning off, electric capacity discharges;
3.: pattern three;As shown in figure 13, power electronics inverter T in T-shaped submodule1Shutoff, T2Conducting, diode D3 Conducting, D1And D2Turning off, change of current brachium pontis bypasses;
4.: pattern four;As shown in figure 14, power electronics inverter T in T-shaped submodule1And T2Turn off, diode D1、D2 And D3Turning off, change of current brachium pontis locking is excised.
The power electronics inverter that can remove bi-directional failure electric current that the present invention provides is short-circuited fault at power system DC side After control method be:
(1) judge that power system DC side is short-circuited fault, locking inverter;
As shown in figure 15,1.: current transformer detects the current signal of change of current brachium pontis in real time, electric current is believed by converter bridge arm controller Number compare with current threshold, whether occur out-of-limit according to current signal amplitude, it is judged that power system DC side be short-circuited therefore Barrier, converter bridge arm controller issues the instruction of locking inverter to T-shaped submodule controller;
2.: power system DC side is short-circuited after fault, system produces the biggest short circuit current, the driving electricity in change of current brachium pontis Road is according to the voltage operation between the gate pole-emitter stage of power electronic devices, locking T-shaped power modules;Due to T-shaped power Block coupled in series connects, thus excises the fault current of change of current brachium pontis, and T-shaped submodule controller is sent out to converter bridge arm controller simultaneously Send the locking information of locking T-shaped power modules.
(2), after converter blocking 200ms, inverter master controller issues unblock inverter instruction;
(3) judge whether inverter restarts, if electric current recovers normal, start successfully;
If restarting successfully, inverter is properly functioning;If restarting failure, then Permanent lockout inverter.
Finally should be noted that: described embodiment is only some embodiments of the present application rather than whole embodiments. Based on the embodiment in the application, those of ordinary skill in the art obtained under not making creative work premise all its His embodiment, broadly falls into the scope of the application protection.

Claims (7)

1. can remove a power electronics inverter for bi-directional failure electric current, described inverter includes by changing that reactor connects Stream brachium pontis, it is characterised in that described change of current brachium pontis includes the T-shaped power modules being connected in series;Submodule controller and described Optical fiber current mutual inductor on change of current brachium pontis is all connected with converter bridge arm controller by optical fiber;Described change of current brachium pontis and inverter master Controller is connected;
Described T-shaped power modules includes two horizontal branches and a vertical branch road, and it is complete that three branch roads all include being connected in series Control type device;Described wholly-controled device uses any one in power electronic devices IGBT, IGCT and GTO;
The horizontal branches of described T-shaped power modules includes the wholly-controled device arranged in the same direction;The connection of said two horizontal branches Point is connected with one end of the wholly-controled device colelctor electrode of described vertical branch road;In described horizontal branches, one end of disconnected point is referred to as water Flush end, in described vertical branch road, one end of disconnected point is referred to as vertical end;Described T-shaped power modules includes that connects a full control The horizontal ends of type device collector and a horizontal ends connecting wholly-controled device emitter stage, arrange one between said two horizontal ends Individual DC capacitor;
In the upper and lower bridge arm of described change of current brachium pontis, a T-shaped power modules is by its vertical end and another T-shaped power modules The horizontal ends of middle connection wholly-controled device emitter stage connects;
The two ends of the upper and lower bridge arm of described change of current brachium pontis are respectively arranged with a T-shaped power modules, the T-shaped power of described upper brachium pontis one end The horizontal ends connecting wholly-controled device emitter stage in submodule is not connected with other T-shaped power modules, described lower brachium pontis one end The vertical end of T-shaped power modules is not connected with other T-shaped power modules, described upper brachium pontis by its above-mentioned horizontal ends, The reactor vertical end above-mentioned with described lower brachium pontis is connected.
A kind of power electronics inverter that can remove bi-directional failure electric current, it is characterised in that institute State in T-shaped power modules connect wholly-controled device emitter stage horizontal ends and described vertical end between a by-pass switch in parallel.
A kind of power electronics inverter that can remove bi-directional failure electric current, it is characterised in that institute State inverse parallel between the colelctor electrode of wholly-controled device and emitter stage and one diode is set.
A kind of power electronics inverter that can remove bi-directional failure electric current, it is characterised in that institute The drive circuit stating all wholly-controled device in T-shaped power modules is all connected with converter bridge arm controller by submodule controller Connect.
5. a removing bi-directional failure current control method for employing power electronics inverter as described in any one of claim 1-4, It is characterized in that, described method includes:
Step 1: judge that power system DC side is short-circuited fault, locking inverter;
Step 2: after described converter blocking 200ms, inverter master controller issues unblock inverter instruction;And
Step 3: judge whether described inverter restarts;If restarting failure, then Permanent lockout inverter.
6. control method as claimed in claim 5, it is characterised in that in described step 1, locking inverter includes:
Optical fiber current mutual inductor detects the current signal flowing through change of current brachium pontis in real time, converter bridge arm controller by described current signal with Current threshold compares, thus judges that power system DC side is short-circuited fault;Described converter bridge arm controller is to submodule Controller issues the instruction of locking inverter.
7. control method as claimed in claim 5, it is characterised in that in described step 1, locking inverter includes:
Power system DC side is short-circuited after fault, the drive circuit action locking T-shaped power modules in change of current brachium pontis, from And excise the fault current of change of current brachium pontis;Described submodule controller sends locking T-shaped power to described converter bridge arm controller Module locking information.
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