CN104601000A - Converter controller, electric energy conversion system and control method - Google Patents

Abstract

The invention relates to a converter controller, an electric energy conversion system and a control method and in particular discloses at least one electric energy conversion system. The electric energy conversion system comprises at least one converter device and a controller. The controller comprises a high-order modulation unit and a pulse pattern distribution unit. The high-order modulation unit performs a modulation method to generate a multi-level pulse signal which has a waveform corresponding to output expected to be obtained by the converter. The pulse pattern distribution unit initiatively generates switching signals for a plurality of switch units according to at least the multi-level pulse signal and at least one obtained system state signal related to the operation of the converter and by using the redundant switching states of the plurality of switch units. The invention also discloses the control method of the converter, and the converter controller.

Description

Converter controller, electrical conversion systems and control method

Technical field

Execution mode disclosed by the invention relates to electrical conversion systems, particularly for the modulator approach of the improvement of electrical conversion systems.

Background technology

Converter (Converter), especially multi-level converter, because it has good output waveform quality and higher voltage endurance capability, obtains at a lot of industrial circle and applies widely gradually.Such as, multi-level converter can be used to perform direct current to exchange transformation of electrical energy operation, with provide single-phase or polyphase ac voltage to the electric machine used in pump or vehicle arrangement, operate with drive motors.In addition, multi-level converter is also used in electricity generation system, such as, in wind power plant and photovoltaic or solar power plant, to perform direct current to the transformation of electrical energy operation exchanged, to provide single-phase or heterogeneous alternating voltage to electrical network, carry out transmitting and distributing with power supply network.

Usually, this multi-level converter comprises multiple switch element or device, such as, insulated gate bipolar transistor and integrated gate commutated thyristor etc., these switch elements or device provide there is the effect of the switching signal of particular switch pattern under, execution turns on and off action, to carry out transformation of electrical energy.The switch pattern of this switching signal can perform one or more modulator approach and change.

Still be necessary to provide the modulator approach of improvement to use for electrical conversion systems.

Summary of the invention

Because the technical problem mentioned above or technical need, one aspect of the present invention is to provide a kind of electrical conversion systems.The controller that this electrical conversion systems comprises at least one convertor device and is connected with this at least one convertor device.This at least one convertor device comprises at least the first converter module and the second converter module, this first converter module and this second converter module are interconnected to form nested type mid point guide frame, and this first and second converter module each comprises multiple switch element.This controller comprises high order modulation unit and pulse pattern allocation units, and this high order modulation unit is configured to perform modulator approach to produce many level pulses signal, and this many level pulses signal has the corresponding waveform of output that to expect with this converter to obtain.These pulse pattern allocation units be configured at least according to this many level pulses signal and at least one obtain operate relevant system status signal to this converter, and the Redundanter schalter state using these multiple switch elements to exist, come initiatively to produce the switching signal being supplied to the plurality of switch element.

In some embodiments, in the electrical conversion systems provided, this high order modulation unit is configured to use at least one command signal to modulate multi-carrier signal, to produce many level pulses signal.

In some embodiments, in the electrical conversion systems provided, this electrical conversion systems comprises at least one first flying capacitor and the second flying capacitor, and this first flying capacitor and this second flying capacitor are connected between this first converter module and this second converter module.Wherein, what these pulse pattern allocation units were configured at least to obtain according to one or more operate relevant striding capacitance voltage to this converter and produces the switching signal being supplied to the plurality of switch element, to balance the voltage of this first flying capacitor and this second flying capacitor at one or more control cycle.

In some embodiments, in the electrical conversion systems provided, this electrical conversion systems comprises at least one voltage sensor, and this at least one voltage sensor is for measuring this one or more striding capacitance voltage.

In some embodiments, in the electrical conversion systems provided, this one or more striding capacitance voltage according to other signals relevant to this first, second flying capacitor, and obtains according to physical model prediction.

In some embodiments, in the electrical conversion systems provided, what these pulse pattern allocation units were configured at least to obtain according to one or more operates relevant Warm status signal to this converter and produces the switching signal being supplied to the plurality of switch element, to reduce the thermal losses of one in the plurality of switch element or many persons at one or more control cycle.

In some embodiments, in the electrical conversion systems provided, this electrical conversion systems comprises one or more heat sensor, and this one or more heat sensor is for measuring this one or more Warm status signal.

In some embodiments, in the electrical conversion systems provided, this one or more Warm status signal obtains based on Biot-fourier equation prediction.

In some embodiments, in the electrical conversion systems provided, this high order modulation unit is configured under different modulation indexs, produce this many level pulses signal.

In some embodiments, in the electrical conversion systems provided, this high order modulation unit is configured under different carrier wave ratios, produce this many level pulses signal.

Another aspect of the present invention is to provide a kind of method, and the method is for controlling the operation of converter in electrical conversion systems.The method at least comprises the steps: to produce many level pulses signal by modulator approach, and waveform and this converter of this many level pulses signal expect that the waveform of the output obtained is corresponding; And the switching signal of multiple switch element in this variator is at least supplied to according to one or more system status signal active accommodation relevant to this converter obtained of this many level pulses signal.

In some embodiments, in the method provided, also comprise the steps: the multiple switch elements the plurality of switching signal being applied to this first converter module and the second converter module, wherein, this first converter module and this second converter module are interconnected to form nested type mid point guide frame.

In some embodiments, in the method provided, the step that wherein active accommodation is supplied to the switching signal of multiple switch element in this variator comprise at least obtain according to one or more operate relevant striding capacitance voltage to this converter and carry out active accommodation to the switching signal being applied to the plurality of switch element.

In some embodiments, in the method provided, the step that wherein active accommodation is supplied to the switching signal of multiple switch element in this variator comprise at least obtain according to one or more operate relevant Warm status signal to this converter and carry out active accommodation to the switching signal being applied to the plurality of switch element, to reduce the thermal losses of one or many persons in the plurality of switch element.

Another aspect of the present invention is to provide a kind of electrical conversion systems.The controller that this electrical conversion systems comprises at least one convertor device and is connected with this at least one convertor device.This at least one convertor device comprises the first converter module and the second converter module, this first converter module and this second converter module are interconnected to form nested type mid point guide frame, and this first and second converter module each comprises multiple switch element.This controller is configured at least to send first group according to the first system status signal with the first numerical value and has the first unit switch state of switch signal to the multiple switch elements in this first and second converter module, makes this converter provide the output with instruction level grade.This controller is also configured at least to send second group according to the first system status signal with second value and has the second unit switch state of switch signal to the multiple switch elements in this first and second converter module, this convertor device is provided have the output of this same instructions level grade, this second unit switch state is not identical with this first unit switch state.

In some embodiments, in the electrical conversion systems provided, this controller is configured at least to send first group according to the second system status signal with the first numerical value and has the first unit switch state of switch signal to the multiple switch elements in this first and second converter module, makes this converter provide the output with instruction level grade; This controller is also configured at least to send second group according to the second system status signal with second value and has the second unit switch state of switch signal to the multiple switch elements in this first and second converter module, this convertor device is provided have the output of this same instructions level grade, this second unit switch state is not identical with this first unit switch state.

In some embodiments, in the electrical conversion systems provided, this first system status signal and this second system status signal are configured to be optimized according to different priority.

Another aspect of the present invention is to provide a kind of electrical conversion systems.The controller that this electrical conversion systems comprises at least one convertor device and is connected with this at least one convertor device.This at least one convertor device comprises the first converter module, second converter module, first flying capacitor and the second flying capacitor, this first converter module and this second converter module are interconnected to form nested type mid point guide frame, first flying capacitor is connected with this first converter module and the second converter module with the second flying capacitor, and this first and second converter module each comprises multiple switch element.This controller comprises high order modulation unit and pulse pattern allocation units, this high order modulation unit is configured to use at least one voltage command signal to modulate to produce many level pulses signal to multi-carrier signal, and this many level pulses signal has the corresponding waveform of output that to expect with this converter to obtain.These pulse pattern allocation units are configured at least measure according to this many level pulses signal and at least one this first flying capacitor of representative and the striding capacitance voltage state signal of the second flying capacitor within one or more cycle before of obtaining, and the Redundanter schalter state using these multiple switch elements to exist, produce the switching signal being supplied to the plurality of switch element.

Another aspect of the present invention is to provide a kind of electrical conversion systems.The controller that this electrical conversion systems comprises at least one convertor device and is connected with this at least one convertor device.This at least one convertor device comprises the first converter module, second converter module, first flying capacitor and the second flying capacitor, this first converter module and this second converter module are interconnected to form nested type mid point guide frame, first flying capacitor is connected with this first converter module and the second converter module with the second flying capacitor, and this first and second converter module each comprises multiple switch element.This controller comprises high order modulation unit and pulse pattern allocation units, this high order modulation unit is configured to use at least one voltage command signal to modulate to produce many level pulses signal to multi-carrier signal, and this many level pulses signal has the corresponding waveform of output that to expect with this converter to obtain.These pulse pattern allocation units are configured at least predict according to this many level pulses signal and at least one this first flying capacitor of representative and the striding capacitance voltage state signal of the second flying capacitor within one or more cycle following of obtaining, and the Redundanter schalter state using these multiple switch elements to exist, produce the switching signal being supplied to the plurality of switch element.

Another aspect of the present invention is to provide a kind of electrical conversion systems.The controller that this electrical conversion systems comprises at least one convertor device and is connected with this at least one convertor device.This at least one convertor device comprises the first converter module, second converter module, first flying capacitor and the second flying capacitor, this first converter module and this second converter module are interconnected to form nested type mid point guide frame, first flying capacitor is connected with this first converter module and the second converter module with the second flying capacitor, and this first and second converter module each comprises multiple switch element.This controller comprises high order modulation unit and pulse pattern allocation units, and this high order modulation unit is configured to perform modulator approach to produce many level pulses signal, and this many level pulses signal has the corresponding waveform of output that to expect with this converter to obtain.These pulse pattern allocation units are configured at least measure according to this many level pulses signal and at least one this first flying capacitor of representative and the striding capacitance voltage state signal of the second flying capacitor within one or more cycle before of obtaining, and the Redundanter schalter state using these multiple switch elements to exist, produce the switching signal being supplied to the plurality of switch element.

Another aspect of the present invention is to provide a kind of electrical conversion systems.The controller that this electrical conversion systems comprises at least one convertor device and is connected with this at least one convertor device.This at least one convertor device comprises the first converter module, second converter module, first flying capacitor and the second flying capacitor, this first converter module and this second converter module are interconnected to form nested type mid point guide frame, first flying capacitor is connected with this first converter module and the second converter module with the second flying capacitor, and this first and second converter module each comprises multiple switch element.This controller comprises high order modulation unit and pulse pattern allocation units, and this high order modulation unit is configured to perform modulator approach to produce many level pulses signal, and this many level pulses signal has the corresponding waveform of output that to expect with this converter to obtain.These pulse pattern allocation units are configured at least predict according to this many level pulses signal and at least one this first flying capacitor of representative and the striding capacitance voltage state signal of the second flying capacitor within one or more cycle following of obtaining, and the Redundanter schalter state using these multiple switch elements to exist, produce the switching signal being supplied to the plurality of switch element.

Another aspect of the present invention is to provide a kind of converter controller, and it is for transmitting control signal at least one convertor device be connected with this converter controller.This at least one convertor device comprises the first converter module, the second converter module, the first flying capacitor and the second flying capacitor.This first converter module and this second converter module are interconnected to form nested type mid point guide frame, first flying capacitor is connected with this first converter module and the second converter module with the second flying capacitor, and this first and second converter module each comprises multiple switch element.This converter controller high order modulation unit and pulse pattern allocation units.This high order modulation unit is configured to perform modulator approach to produce many level pulses signal, and this many level pulses signal has the corresponding waveform of output that to expect with this converter to obtain; These pulse pattern allocation units are configured at least predict according to this many level pulses signal and at least one this first flying capacitor of representative and the striding capacitance voltage state signal of the second flying capacitor within one or more cycle following of obtaining, and the Redundanter schalter state using these multiple switch elements to exist, produce the switching signal being supplied to the plurality of switch element.

Another aspect of the present invention is to provide a kind of converter controller, and it is for transmitting control signal at least one convertor device be connected with this converter controller.This at least one convertor device comprises the first converter module, the second converter module, the first flying capacitor and the second flying capacitor.This first converter module and this second converter module are interconnected to form nested type mid point guide frame, first flying capacitor is connected with this first converter module and the second converter module with the second flying capacitor, and this first and second converter module each comprises multiple switch element.This converter controller comprises high order modulation unit and pulse pattern allocation units.This high order modulation unit is configured to perform modulator approach to produce many level pulses signal, and this many level pulses signal has the corresponding waveform of output that to expect with this converter to obtain; These pulse pattern allocation units are configured at least measure according to this many level pulses signal and at least one this first flying capacitor of representative and the striding capacitance voltage state signal of the second flying capacitor within one or more cycle before of obtaining, and the Redundanter schalter state using these multiple switch elements to exist, produce the switching signal being supplied to the plurality of switch element.

Electrical conversion systems provided by the invention, converter controller and corresponding control methods, by performing initiatively modulation algorithm, using the Redundanter schalter state existing for switch element initiatively to regulate operating one or more relevant parameter to this converter, the reliability service of this electrical conversion systems can be guaranteed.

Accompanying drawing explanation

Be described embodiments of the present invention in conjunction with the drawings, the present invention may be better understood, in the accompanying drawings:

Figure 1 shows that the module diagram of a kind of execution mode of the electrical conversion systems that the present invention proposes, this electrical conversion systems is configured to perform initiatively modulation algorithm;

Figure 2 shows that the detailed circuit topological structure schematic diagram that can be carried out a kind of execution mode of the converter controlled by the active modulation algorithm of execution the present invention proposition;

Figure 3 shows that the module diagram of a kind of execution mode of the active modulation module that can be performed by the electrical conversion systems shown in Fig. 1;

Fig. 4 performs the schematic diagram of the various execution modes in actual current path that active modulation algorithm that the present invention proposes exists in the converter shown in Fig. 2 to Figure 7 shows that;

Figure 8 shows that the module diagram of the another kind of execution mode of the active modulation module that can be performed by the electrical conversion systems shown in Fig. 1;

Figure 9 shows that the module diagram of the another kind of execution mode of the active modulation module that can be performed by the electrical conversion systems shown in Fig. 1; And

Figure 10 shows that the flow chart of a kind of execution mode controlling the method that converter runs.

Embodiment

The modulator approach of improvement is broadly directed to, to provide the pulse signal of optimization to the converter in electrical conversion systems at this one or more described by reference to the accompanying drawings execution mode.More specifically, in one or more execution modes, the invention provides a kind of initiatively modulation algorithm.It should be noted that the active modulation algorithm disclosed at this is different from traditional modulation algorithm, generally speaking, the passive generation of traditional modulation algorithm is used for the pulse signal of driving transducer.

In one embodiment, this active modulation algorithm perform time can indirectly produce there is certain pulses pattern switching pulse signal to converter, such as produce by least two steps the switching pulse signal that this has certain pulses pattern.In a first step, produce initial many level pulses signal by modulator approach, and in the second step, use this initial many level pulses signal to produce the respective switch signal of the multiple switch elements be supplied in converter.After this respective switch signal is applied the multiple switch elements to this converter, make this converter provide the output signal of expectation, such as, alternating voltage outputs signal, this alternating voltage output signal also has the waveform of many level, and corresponding with the waveform of this initial many level pulses signal.In one or more level grade expected of this initial many level pulses signal, there is different options (or also referred to as redundancy), think the specific pulse pattern of respective switch signal behavior (or also referred to as unit switch state).Therefore, in some embodiments, the pulse pattern of this respective switch signal can be regulated by mode more subtly, with the output waveform making this converter can provide expectation, and can obtain various other functions relevant to this electrical conversion systems.

In one embodiment, one or more is by measuring, prediction or other various means obtain or monitoring obtains operates relevant system status signal online to converter, the pulse pattern revising or optimize respective switch signal can be used to, to obtain various requirement of system design.For example, the pulse pattern of this respective switch signal can according to measuring or predicting that the striding capacitance voltage signal relevant to the flying capacitor in this converter obtained is modified or optimize, carry out to make superpotential flying capacitor discharging and under voltage flying capacitor is charged, thus guarantee that the voltage of the plurality of flying capacitor averages out.In another example, the Warm status signal relevant to one or more switch element in this converter can be used to revise or optimize this respective switch signal.Especially, in this example, the pulse pattern of this respective switch signal can be modified or optimize, be reduced to make the thermal losses of focus (hot-spot) switch element at one or more control cycle or minimize, or multiple switch element can be made to obtain balanced switch motion, thus avoid the premature failure of partial switch unit.

The active modulation algorithm performing the present invention's proposition can obtain multiple technological merit or beneficial effect.One of them technological merit or beneficial effect are operate one or more relevant system status signal can be optimized to this converter.For example, the voltage of flying capacitor can average out and/or the thermal losses of one or more switch element can be reduced or minimize.Another technological merit or beneficial effect are because the voltage of flying capacitor obtains good balance, and the capacitor of low cost therefore can be used to reduce the cost of whole electrical conversion systems.Another technological merit or beneficial effect are modulation index and the carrier wave ratio that can use various change when performing the active modulation algorithm that the present invention proposes.For the personnel that this area has usual knowledge, by read hereafter by reference to the accompanying drawings the detailed description done, be easy to understand that the specific embodiment of the invention can also produce other technologies advantage or technique effect.

One or more embodiment of the present invention below will be described.First it is to be noted, in the specific descriptions process of these execution modes, in order to carry out brief and concise description, this specification can not all do detailed description to all features of the execution mode of reality.Should be understandable that; in the actual implementation process of any one execution mode; as in the process of any one engineering project or design object; in order to realize the objectives of developer; or in order to meet that system is correlated with or that business is relevant restriction; usually can make various concrete decision-making, and this also can change to another kind of execution mode from a kind of execution mode.In addition, it will also be appreciated that, although effort done in this development process may be complicated and tediously long, but for those of ordinary skill in the art relevant to content disclosed by the invention, some designs that the basis of the technology contents of disclosure exposure is carried out, manufacture or production etc. changes just conventional technological means, not should be understood to content of the present disclosure insufficient.

Unless otherwise defined, the technical term used in the present specification and claims or scientific terminology should be in the technical field of the invention the ordinary meaning that the personage with general technical ability understands." first " or " second " that use in this specification and claims and similar word do not represent any order, quantity or importance, and are only used to distinguish different parts.The similar word such as " one " or " one " does not represent restricted number, but represents to there is at least one." or " comprise in cited project any one or all." comprise " or the similar word such as " comprising " mean to appear at " comprising " or " comprising " before element or object contain the element or object and equivalent element thereof that appear at " comprising " or " comprising " presented hereinafter, do not get rid of other elements or object." connection " or " being connected " etc. similar word be not defined in physics or the connection of machinery, no matter but can comprise electrical connection, be direct or indirectly.In addition, the set that " circuit " or " Circuits System " and " controller " etc. can comprise single component or directly or be indirectly connected by multiple active member or passive device, such as one or more integrated circuit (IC) chip, to provide the corresponding function described.

Refer to Fig. 1, it is depicted as the module diagram of a kind of execution mode of electrical conversion systems 100 provided by the invention.As shown in Figure 1, this electrical conversion systems 100 roughly comprises electrical energy changer 120(also referred to as converter, current transformer, power inverter or power converter) and control device 140(also referred to as controller), this convertor device 120 and controller 140 can communicate to connect.In one embodiment, this controller 140 can be electrically connected with convertor device 120, and such as, to pass through one or more electrical interconnection, conductor wire, transfer control signal 106 gives convertor device 120.In another execution mode, this controller 140 also can carry out light with convertor device 120 and be connected, and to pass through optical communication line, such as, one or more optical fiber, transfer control signal 106 gives convertor device 120.In another execution mode, this controller 140 can be housed in this convertor device 120, or integrates with this convertor device 120, to form single element or module.This controller 140 can comprise any suitable programmable circuit or device, comprise digital signal processor (Digital Signal Processor, DSP), field programmable gate array (FieldProgrammable Gate Array, FPGA), programmable logic controller (PLC) (Programmable LogicController, and application-specific integrated circuit (ASIC) (Application Specific Integrated Circuit, ASIC) etc. PLC).This convertor device 120 responds the control signal 106 transmitted from this controller 140, with fill order between the first power device 110 and the second power device 130 to or the operation of two-way transformation of electrical energy.

In one embodiment, as shown in Figure 1, this convertor device 120 comprises the first converter 122, DC link 124 and the second converter 126.In one embodiment, this first converter 122 can be A.C.-D.C. converter (also referred to as rectifier), it is configured to by this first power device 110(such as, electrical network) the first electric energy 102(of providing is such as, first alternating voltage) convert direct current energy 123(to such as, direct voltage).In one embodiment, this DC link 124 can comprise multiple capacitor, and it carries out filtering to the first direct voltage 123 that this first converter 122 provides, to provide the second direct voltage 125 to this second converter 126.In the execution mode shown in Fig. 1, this DC link 124 is illustrated into independently element, but, in other embodiments, this DC link 124 also can integrate with this first converter 122, or integrates with this second converter 126.

In one embodiment, this second converter 126 is direct-current-alternating-current converter (also referred to as inverter), it is configured to convert this second direct voltage 125 to second alternating voltage 104, and this second alternating voltage 104 is sent to the second power device 130(such as, alternating current machine), or this second alternating voltage 104 is supplied to a power network, such as load and/or electrical network (scheming not shown).Although not shown, but this electrical conversion systems 100 also can comprise miscellaneous part or device, such as, between the first power device 110 and this convertor device 120, can filter and circuit breaker etc. be set, and, between this convertor device 120 and this second power device 130, also can filter and circuit breaker etc. be set.

This electrical conversion systems 100 shown in Fig. 1 can be applied to multiple field, and for example, this electrical conversion systems 100 can be applied to motor and drive field, to drive one or more motor, and such as alternating current machine.In other embodiments, this electrical conversion systems 100 also can be applied to power field, includes but not limited to wind power generation plant, photovoltaic power generation apparatus, the combination of hydroelectric installation and above-mentioned Blast Furnace Top Gas Recovery Turbine Unit (TRT).In other embodiments, this electrical conversion systems 100 also can be applied to needs to use uninterruptible power system (Uninterruptible Power System, UPS) to carry out the field powered.In UPS application scenario, this first converter 122 can be A.C.-D.C. converter, and it can be configured to by the first power device 110(such as, electrical network) provide first AC energy conversion or be rectified into direct current energy.This electrical conversion systems 100 can also comprise energy storing device 127, to receive and to store the direct current energy that this first converter 122 is converted to.In UPS application scenario, this second converter 126 can be direct-current-alternating-current converter, it can be configured to the direct current energy that is converted to by this first converter 122 or convert the direct current energy that this energy storing device 127 provides to second AC energy, and this second AC energy is supplied to this second power device 130(such as, load).

Please continue to refer to Fig. 1, controller 140 in this electrical conversion systems 100 can comprise initiatively modulation module 28, this active modulation module 28 can be realized by software, also can be realized by hardware, or also can be realized by the mode of combination of hardware software, and can be operationally one or more converter generation control signal in electrical energy changer 120 or pulse signal 106.More specifically, this active modulation module 28 is when performing, can produce to have and optimize the switching signal of pulse pattern or pulse signal 106, thus make to run to this electrical conversion systems 100 system design criteria that one or more relevant system status signal can expect according to one or more and reasonably regulate.In one embodiment, the pulse pattern of this pulse signal 106 can according to one or more by measuring, and the system status signal 108 that prediction and any other various means obtain dynamically changes or revises.As a nonrestrictive embodiment, this pulse signal 106 can be optimized by specific mode, makes the voltage at the flying capacitor place of this electrical energy changer 120 obtain equilibrium.Detail about this initiatively modulation algorithm 28 will be described at hereafter composition graphs 3,8 and 9.

Next, refer to Fig. 2, it is depicted as the detailed circuit topological structure schematic diagram of a kind of execution mode of converter 200.More specifically, Fig. 2 shows a kind of detailed circuit diagram being configured to have nested type mid point guiding topological structure converter 200.In the specific execution mode of one, this converter 200 can by nesting together the first converter module 211 and the second converter module 213 and form.In one embodiment, this first converter module 211 and the second converter module 213 can be configured to have identical version, such as, in the specific execution mode of one, the first converter module 211 and the second converter module 213 are all configured to provide three level to export.Therefore, this first converter module 211 and the second converter module 213 combine can provide five level to export.In other embodiments, more converter module can be carried out nested type setting by similar mode by this converter 200, and to provide the level of 2n-1 grade to export, wherein n is greater than or equal to 3.This converter 200 can be performed as a phase place in the second converter as shown in Figure 1 or inverter 126, with by converting direct-current voltage into alternating-current voltage.This converter 200 also can be performed as a phase place in the first converter as shown in Figure 1 or rectifier 122, to convert alternating voltage to direct voltage.

As shown in Figure 2, this converter 200 comprises four switch elements 210,220,230,240, and these four switch elements 210,220,230,240 are connected in series to form longitudinal brachium pontis 264.In the illustrated embodiment, these four switch elements 210,220,230, each in 240 comprises two switching devices that head and the tail are connected in series, and is connected in series mode the semiconductor switch device of low voltage withstand class can be used to share the voltage acted on by input positive line 206 and negative line 208 equably by this.This input positive line 206 and negative line 208 are connected with the first port 202 and the second port 204 respectively, to receive input voltage from voltage source (scheming not shown).More specifically, the collector electrode title of other semiconductor switch device equivalences (or with) of the emitter title of other semiconductor switch device equivalences (or with) and the second switch device 214 of this first switching device 212 is connected.In other embodiments, these four switch elements 210,220,230, each in 240, according to the actual needs, can comprise the switching device that two or more links together in a series arrangement.

As shown in Figure 2, this converter 200 also comprises two switch elements 250,260, and these two switch elements 250,260 are connected in series to form horizontal brachium pontis 266.In the illustrated embodiment, these two switch elements 250, each in 260 comprises two switching devices that first first or tail tail is connected in series.More specifically, the emitter of two switching devices 236,238 links together, and the emitter of another two switching devices 232,234 links together.In other embodiments, these two switch elements 250, in 260, each of four switching devices 232,234,236,238 can replace to the switching device of at least two series connection, to allow also to use low withstand voltage switching device at horizontal brachium pontis 266.

Please consult Fig. 2 further, this converter 200 is connected with DC link 270 with negative line 208 by input positive line 206.In the illustrated embodiment, this DC link 270 comprises the first capacitor 242 and the second capacitor 244, and this first capacitor 242 and the second capacitor 244 are connected between this input positive line 206 and negative line 208 in the mode of series connection.This first capacitor 242 and the second capacitor 244 interconnect, and to form DC bus mid point 252, one end of this DC bus mid point 252 brachium pontis 266 horizontal with this further is connected.

Please consult Fig. 2 further, this converter 200 also comprises the first flying capacitor 246 and the second flying capacitor 248.One end of this first flying capacitor 246 is electrically connected with the tie point 254 between the first switch element 210 and second switch unit 220, the other end of this first flying capacitor 246 and two switch elements 250 of horizontal brachium pontis 266, the tie point 256 between 260 is electrically connected.One end of this second flying capacitor 248 is electrically connected with tie point 256, and the other end of this second flying capacitor 248 is electrically connected with the tie point 258 between the 3rd switch element 230 and the 4th switch element 240.As hereafter the detailed description done, the voltage of this first flying capacitor 246 and the second flying capacitor 248 can by performing active modulation algorithm that the present invention proposes or method carry out controlling or balancing.

Figure 3 shows that can by the module diagram of the active modulation module 300 of the electrical conversion systems 100 shown in Fig. 1 or a kind of execution mode more specifically performed by the controller 140 in electrical conversion systems 100.As shown in Figure 3, this active modulation module 300 comprises high order modulation unit 312, and this high order modulation unit 312 is configured to produce initial many level pulses signal 314 by performing one or more modulator approach.This initial many level pulses signal 314 does not directly send converter 200 to, on the contrary, this initial many level pulses signal 314 is used to produce individual impulse signal, then this individual impulse signal is used to drive the multiple switch elements in this converter 200, thus the output voltage making this converter 200 that the waveform of many level pulse signal 314 initial with this can be provided corresponding and/or output current.In the specific execution mode of one, this high order modulation unit 312 can be configured to produce initial many level pulses signal 314 with five varying level exponent numbers, and this level exponent number exports corresponding with converter 200.In other embodiments, this high order modulation unit 312 also can be configured to produce the many level pulses signal 314 had more than five discrete level exponent numbers, such as, and seven level and nine level signals etc.,

In one embodiment, this high order modulation unit 312 is configured to by performing multi-carrier modulation method, such as, and translation pulse-width modulation method (level-shifted pulse width modulation, LSPWM).In other embodiments, this high order modulation unit 312 also can be configured to use other modulator approaches, include but not limited to, optimize pulse pattern computational methods (optimized pulse patterncalculation, OPP) and phase-shifted pulse width modulation methods etc., this initial many level pulses signal 314 is produced.In the execution mode shown in Fig. 3, this high order modulation unit 312 can receive the command signal 306 provided by command signal generation unit 302, this command signal 306 can comprise voltage command signal, and this voltage command signal has specific corresponding with the output voltage that converter 200 is expected waveform.As a nonrestrictive embodiment, the voltage command signal 306 provided by this command signal generation unit 302 can be sinusoidal waveform, and with converter 200, this sinusoidal waveform expects that the waveform of the ac output voltage obtained is corresponding.This command signal 306 also can comprise frequency command signal (such as, 50 hertz or 60 hertz), the frequency values that the output signal that the output that its representative is desirably in converter 200 provides has.

In one embodiment, this high order modulation unit 312 also receives the multiple carrier signals 308 provided by carrier signal generation unit 304.In the specific execution mode of one, this carrier signal generation unit 304 can produce four carrier signals (briefly indicating with 308), and each carrier signal all has triangular waveform.Under translation pulse-width modulation method execution mode, these four carrier signals 308 are separated from each other in vertical direction, thus can together for command signal 306 defines a linear modulation range.Therefore, when actual motion, this command signal 306 and this four carrier signals 308 are crossing, can produce many level pulses signal 314 with five discrete level grades within one or more cycle.This five level pulses signal 314 indicates any one moment within one or more cycle, the level grade reached desired by the output voltage of converter 200.

Please consult Fig. 3 further, this active modulation module 300 also comprises pulse pattern allocation units 316.These pulse pattern allocation units 316 are connected with this high order modulation unit 312, to receive initial many level pulses signal 314 that this high order modulation unit 312 provides.These pulse pattern allocation units 316 are also configured at least produce individual impulse signal or switching signal (briefly indicating with 318) based on this initial many level pulses signal 314, this respective switch signal 318 is provided to multiple switch elements of converter 200, performs switch motion to control these switch elements.In one embodiment, these pulse pattern allocation units 316 are configured to the mode with ACTIVE CONTROL, produce this respective switch signal 318 by using the Redundanter schalter state existing for switching signal 318.More specifically, these pulse pattern allocation units 316 can be configured to receive one or more and run one or more relevant system status signal to this converter 200.These pulse pattern allocation units 316 are further configured at least according to this comprehensive multiple system status signal in lake, the Redundanter schalter state existing for switching signal 318 of use is revised or optimizes this respective switch signal 318, to control this system status signal according to one or more system design criteria or to regulate.The output of same level grade can be obtained when this so-called " Redundanter schalter state " refers to multiple switch element to converter of switching signal by providing at least two groups to have various combination on off state.

In the execution mode shown in Fig. 3, the striding capacitance voltage 322 relevant to converter 200 that these pulse pattern allocation units 316 are configured at least obtain according to one or more is revised or optimizes respective switch signal 318.In some embodiments, except the striding capacitance voltage 322 that can be obtained by real-time mode, other parameters or signal, such as, by determine within the cycle before each switch element switch state signal and flow through the electric current etc. of converter, respective switch signal 318 is optimized.In one embodiment, this striding capacitance voltage 322 can obtain by using one or more to associate direct measurement of the voltage sensor (scheming not shown) arranged with flying capacitor 246,248.In other embodiments, this flying capacitor voltage 322 also can be calculated by indirectly mode or be predicted and obtain.For example, this flying capacitor voltage 322 according to known physical model, can use other parameters or signal, such as, flows through flying capacitor 246, and the electric current of 248 and the capacitance etc. of flying capacitor 246,248, calculate.

Fig. 4 and Fig. 5 shows and more specifically selects the switching signal of various combination on off state to drive multiple switch element of this converter 200 thus can obtain the running status schematic diagram that output voltage grade is the converter of " 1 ".When the voltage expecting to obtain " 1 " grade exports, wherein one is chosen as: by switching device 212, and 214,234,236 is open-minded, by switching device 212, and 214,232,238,222,224,226,228 turn off, in this case, electric current along input positive line 206, two switching devices 212,214, first flying capacitor 246, switching device 236, the first current path (as shown in thick lines in Fig. 4 282) that the antiparallel diode be associated with switching device 238 is formed arrives output 262.When the voltage expecting to obtain " 1 " grade exports, another is chosen as: by switching device 216, and 218,232,234 is open-minded, by switching device 222,224,226,228 turn off, therefore, electric current can along the antiparallel diode be associated with switching device 232, switching device 234, the first flying capacitor 246, the second current path (as shown in thick lines in Fig. 5 284) the arrival output 262 that two switching devices 216,218 are formed.The corresponding two kinds of unit switch states of multiple switch elements of the converter 200 corresponding with output voltage grade " 1 " are as shown in following table-1:

The unit switch state of table-1 converter

When output-voltage levels grade is " 1 ", owing to there is the current path of redundancy or switch combination on off state to control multiple switch element, therefore, optionally can form the first current path 282 or the second current path 284, flow through with making current selective, thus can optionally the first flying capacitor 246 be charged or be discharged, to obtain the balance of striding capacitance voltage.For example, when the flying capacitor voltage signal 322(of these pulse pattern allocation units 316 reception is also referred to as the first system status signal) there is the first parameter value, and flying capacitor voltage signal 322 is when showing that this first flying capacitor 246 is just being operated under overvoltage situation or when the voltage of this first flying capacitor 246 is greater than the voltage of this second flying capacitor 248, these pulse pattern allocation units 316 can produce this respective switch signal 318 especially, this respective switch signal 318 is made to have the first unit switch state, be discharged to allow this first flying capacitor 246.Or, if the flying capacitor voltage signal 322 that these pulse pattern allocation units 316 receive has the second parameter value, and flying capacitor voltage signal 322 is when showing that this first flying capacitor 246 is just being operated under under voltage situation or when the voltage of this first flying capacitor 246 is less than the voltage of this second flying capacitor 248, these pulse pattern allocation units 316 can produce this respective switch signal 318 especially, make this respective switch signal 318 have the second unit switch state, charged to allow this first flying capacitor 246.Therefore, in the process that this converter 200 normally runs, the voltage of this first flying capacitor 246 and the second flying capacitor 248 can dynamically balance.

Similarly, Fig. 6 and Fig. 7 shows and more specifically selects the switching signal of various combination on off state to drive multiple switch element of this converter 200 thus can obtain the running status schematic diagram that output voltage grade is the converter of "-1 ".When the voltage expecting to obtain "-1 " grade exports, wherein one is chosen as: by switching device 238, and 226,228 is open-minded, by switching device 212,214,216,218,222,224,232,234,236 turn off, and in this case, electric current can flow out from output 262, and along switching device 238, the antiparallel diode be associated with switching device 236, the second flying capacitor 248, two switching device 226,226, and the 3rd current path that negative line 208 is formed (as shown in thick lines in Fig. 6 286) arrives input 204.When the voltage expecting to obtain "-1 " grade exports, another is chosen as: by switching device 222, and 224,234 is open-minded, by switching device 212,214,216,218,226,228,236,238 turn off, therefore, electric current can flow out from output 262, and along by two switching devices 222,224, second flying capacitor 248, switching device 234, the 4th current path (as shown in thick lines in Fig. 7 288) that the antiparallel diode be associated with switching device 232 is formed arrives mid point 252.The corresponding two kinds of unit switch states of multiple switch elements of the converter 200 corresponding with output voltage grade "-1 " are as shown in following table-2:

The unit switch state of table-2 converters

When output-voltage levels grade is "-1 ", owing to there is the current path of redundancy or switch combination on off state to control multiple switch element, therefore, optionally can form the 3rd current path 286 or the 4th current path 288, flow through with making current selective, thus can optionally the second flying capacitor 248 be charged or be discharged, to obtain the balance of striding capacitance voltage.For example, the flying capacitor voltage signal 322 received when these pulse pattern allocation units 316 has the first parameter value, and flying capacitor voltage signal 322 is when showing that this second flying capacitor 246 is just being operated under under voltage situation or when the voltage of this second flying capacitor 248 is less than the voltage of this first flying capacitor 246, these pulse pattern allocation units 316 can produce this respective switch signal 318 especially, make this respective switch signal 318 have the first unit switch state, charged to allow this second flying capacitor 246.Or, if the flying capacitor voltage signal 322 that these pulse pattern allocation units 316 receive has the second parameter value, and flying capacitor voltage signal 322 is when showing that this second flying capacitor 246 is just being operated under overvoltage situation or when the voltage of this second flying capacitor 248 is greater than the voltage of this first flying capacitor 246, these pulse pattern allocation units 316 can produce this respective switch signal 318 especially, make this respective switch signal 318 have the second unit switch state, be discharged to allow this second flying capacitor 248.Therefore, in the process that this converter 200 normally runs, the voltage of this first flying capacitor 246 and the second flying capacitor 248 can dynamically balance.

The active modulation algorithm 300 proposed owing to performing the present invention can balance preferably to the voltage of flying capacitor, therefore, compared to existing technologies, operation parameter can require that relatively low flying capacitor contributes to reducing the holistic cost of electrical conversion systems 100.

Next, refer to Fig. 8, it is depicted as the module diagram of the active modulation module 310 of the another kind of execution mode that can be performed by the electrical conversion systems 100 shown in Fig. 1.Similar with the active modulation module 300 shown in Fig. 3, this active modulation module 310 also can be realized by software, or realized by hardware, or also can be realized by the mode of combination of hardware software, and can be performed by the control device shown in Fig. 1 or controller 140.A difference of the active modulation module 310 shown in Fig. 8 and the active modulation module 300 shown in Fig. 3 is: pulse pattern allocation units 316 are configured at least modify according to one or more Warm status signal 324 pairs of respective switch signals 318 or optimize.In one embodiment, this Warm status signal 324 represents the hot situation of one or more switch element of this converter 200, and this Warm status signal 324 can pass through one or more heat sensor, and such as thermosensitive resistance measurement obtains.In other embodiments, this Warm status signal 324 also according to known Biot-fourier equation, can use other parameters or signal, and the electric current etc. such as flowing through switch element calculates.

Converter 200 shown in Fig. 2 is when normal operation, suitable thermal losses can be produced when repeatedly turning on and off the switch element in it, if such thermal losses is not controlled rightly, some switch elements then may be caused to be in superheat state or to be called focus (hot spot), like this then the shortening in switch element useful life can be caused.In the illustrated embodiment, the hot situation of the plurality of switch element is measured substantially in real time, prediction or monitoring.In one embodiment, if when the Warm status signal 324 that these pulse pattern allocation units 316 receive shows that one or more switch element is operated in focus state or namely will becomes focus, these pulse pattern allocation units 316 can be configured to modify according to such Warm status signal 324 pairs of respective switch signals 318 or optimize, the switch element being in focus state of switch unit or being about to become focus is made to reduce switch motion within one or more cycle ensuing, therefore, be in the thermal losses that focus state of switch unit can be cooled to reduce or farthest reduce switch element generation, or avoid the switch element that may become focus to be heated excessively.

In execution mode more specifically, for example, the Warm status signal 324 received by these pulse pattern allocation units 316 two switching devices 212,214 of display transformation device 200 may be operated in the temperature conditions being greater than rated temperature.In this case, when the output of converter 200 needs output order level for " 1 ", this two switch elements 212 are opened with it, 214, make electric current along the first current path 282(as shown in Figure 4) flow through, not as optionally being closed by these two switch elements 212,214, make electric current from the second current path 284(as shown in Figure 5) flow through.Therefore, after one or more control cycle, these two switch elements 212,214 can by suitable cooling, to eliminate the negative effect that excess temperature brings.

Active modulation module 300,310 shown in Fig. 3 and Fig. 8 can be modified by various mode.For example, in some embodiments, alternatively or further, these pulse pattern allocation units 316 can be further configured to and modify to respective switch signal 318 according to other system state parameter or signal or optimize, to obtain other control objectives.

For example, these pulse pattern allocation units 316 can be configured at least to modify to respective switch signal 318 according to two or more system status parameters or optimize.For example, show can by the electrical conversion systems 100 shown in Fig. 1 or the more specifically module diagram of the active modulation module 320 of another kind of execution mode that performs of controller 140 for Fig. 9.In one embodiment, these pulse pattern allocation units 316 are configured to receive one or more the first system status signal 326, especially, this the first system status signal 326 can representation transformation device 200(as shown in Figure 2) in one or more striding capacitance voltage signal 326 at one or more flying capacitor 246,248 place.As described above, this one or more represent striding capacitance magnitude of voltage the first system status signal 326 can obtain by directly measuring, also can be recorded by indirect predictions or calculating.These pulse pattern allocation units 316 are further configured to and receive one or more the second system status signal 328, this the second system status signal 328 can comprise Warm status signal, for the hot situation at one or more switch element place represented in converter 200.As described above, the second system status signal 328 representing hot situation also can be obtained by measurement or obtains by calculating or predicting.

Please continue to refer to Fig. 9, in one embodiment, under these pulse pattern allocation units 316 are configured to operate at specific mode, or more specifically, use Redundanter schalter state to be optimized the first system status signal 326 and be configured to be optimized the second system status signal 328 than use Redundanter schalter state that there is higher priority.Also be, in this embodiment, as long as the striding capacitance voltage at flying capacitor place is in non-equilibrium state, namely these pulse pattern allocation units 316 use Redundanter schalter state modify to the respective switch signal 318 being supplied to multiple switch element or optimize, to obtain the balance of striding capacitance voltage at one or more control cycle.

In another execution mode, modify according to the first system status signal 326 pairs of respective switch signals or the priority optimized and to modify according to the second system status signal 328 pairs of respective switch signals or the priority optimized can adjust according to the operation conditions of reality.In one embodiment, the functional module that these pulse pattern allocation units 316 or another one are connected with these pulse pattern allocation units 316 can be configured to first to judge this for the first system status signal 326 that respective switch signal is optimized and the operation of the second system status signal 328 whichever to system more important.Such as, if it is determined that go out the striding capacitance voltage imbalance question relevant to the first system status signal 326 more outstanding than the focus excess temperature problem relevant with the second system status signal 328 time, be optimized according to the first system status signal 326 pairs of respective switch signals and can be configured to that there is higher priority.Now, these pulse pattern allocation units 316 be configured at least according to this first system status signal 326 for multiple switch element produces individual impulse signal 318, to make under the effect of the respective switch signal 318 of this optimization, flying capacitor voltage can be balanced in one or more cycle.Under another situation, if it is determined that go out the focus excess temperature problem relevant to the second system status signal 328 more outstanding than the striding capacitance voltage imbalance question relevant with the first system status signal 326 time, be optimized according to the second system status signal 328 pairs of respective switch signals and can be configured to that there is higher priority.Now, these pulse pattern allocation units 316 be configured at least according to this second system status signal 328 for multiple switch element produces individual impulse signal 318, to make under the effect of the respective switch signal 318 of this optimization, reduce the thermal losses of focus switch element.

Figure 10 shows that the flow chart of a kind of execution mode of method 900, the method 900, for providing switch controlling signal to the multiple switch elements in the converter 200 shown in Fig. 2, is run to control it.In one embodiment, the module at least partially of the method 900 can be programmed for program command or computer software, and is kept on the storage medium that can be read by computer or processor.When this program command is performed by computer or processor, each step as shown in the flowchart can be realized.Be appreciated that the medium of computer-readable can comprise volatibility with non-volatile, in any method or technology realize moveable and non-moveable medium.More specifically, the medium of computer-readable includes but not limited to random access storage device, read-only memory, electrically erasable read-only memory, flash memories, or the memory of other technologies, compact disc read-only memory, digitlization disk storage, or other forms of optical memory, cassette, tape, magnetic disc, or other forms of magnetic storage, and the storage medium that can be used to the predetermined information that stored energy is accessed by instruction execution system of any other form.

In one embodiment, the method 900 can perform from step 902, in step 902, produces initial many level pulses signal by performing modulator approach.For example, in one embodiment, as shown in Fig. 3, Fig. 8 and Fig. 9, this initial many level pulses signal can be produced by high order modulation unit 312.A kind of modulator approach that this high order modulation unit 312 performs can be multi-carrier modulation method, such as translation pulse-width modulation method.The waveform of this initial many level pulses signal and the output of converter 200 expect that the waveform of the waveform such as alternating voltage obtained is corresponding.

In step 904, the method 900 continues to perform, and obtains at least one and runs relevant system status signal to converter.In one embodiment, this at least one system status signal comprises the voltage signal at the flying capacitor place in converter, is the voltage signal at the flying capacitor place of the converter of nested type mid point guiding topological structure especially.This one or more striding capacitance voltage can use one or more voltage sensor measurement to obtain, and also can obtain according to other parameters relevant to this flying capacitor or signal estimation.In another execution mode, this at least one system status signal also can comprise the Warm status signal of the hot situation at one or more switch element place of response transform device.This Warm status signal can use one or more heat sensor measurement to obtain, or calculates according to Biot-fourier equation.

In step 906, the method 900 continues to perform, and at least produces respective switch signal according to this initial many level pulses signal and this at least one system status signal obtained.In one embodiment, when this respective switch signal runs according to the multiple switch elements in converter, existing Redundanter schalter state is modified or optimizes.For example, if this at least one system status signal obtained shows two flying capacitor 246 as shown in Figure 2, when the voltage at 248 places is in non-equilibrium state or will be in non-equilibrium state, export at the specific instruction level of converter, this respective switch signal can be modified or be optimized to has specific unit switch state, multiple switch elements of converter are made to carry out action under the effect of the respective switch signal of this optimization, thus the voltage at this two flying capacitor 246,248 place is averaged out.

In step 908, the method 900 continues to perform, by the multiple switch elements of the respective switch signal function of optimization to converter.Because the respective switch signal optimized produces by using the on off state of redundancy, one or more therefore relevant to the operation of this converter system parameters can be optimized.For example, in one embodiment, the voltage at this flying capacitor 246,248 place can average out.In another execution mode, the thermal losses of one or more switch element of converter can be lowered or minimize.

Certainly, each step described in conjunction with Figure 10 also can change in several ways above.For example, in some embodiments, in step 904, at least two can be received and run relevant system status signal to converter, comprise the Warm status signal of striding capacitance voltage signal and switch element.In some embodiments, the method 900 can also comprise the step determining priority, such as, if the imbalance problem of striding capacitance voltage is more outstanding than the problems of excessive heat of switch element, can set and to respective switch signal optimizing, there is higher priority to according to striding capacitance voltage signal, also namely, first optimization function is to the respective switch signal of switch element, and striding capacitance voltage is averaged out.In other embodiments, if the problems of excessive heat of switch element is more outstanding than the imbalance problem of striding capacitance voltage, can set and to respective switch signal optimizing, there is higher priority to according to Warm status signal, also be, first optimization function is to the respective switch signal of switch element, eliminates or alleviate the problems of excessive heat of switch element.

Although describe the present invention in conjunction with specific execution mode, those skilled in the art will appreciate that and can make many amendments and modification to the present invention.Therefore, recognize, the intention of claims is to be encompassed in all such modifications in true spirit of the present invention and scope and modification.

Claims (10)

1. an electrical conversion systems, is characterized in that: the controller that this electrical conversion systems comprises at least one convertor device and is connected with this at least one convertor device; This at least one convertor device comprises at least the first converter module and the second converter module, this first converter module and this second converter module are interconnected to form nested type mid point guide frame, and this first and second converter module each comprises multiple switch element; This controller comprises high order modulation unit and pulse pattern allocation units, and this high order modulation unit is configured to perform modulator approach to produce many level pulses signal, and this many level pulses signal has the corresponding waveform of output that to expect with this converter to obtain; These pulse pattern allocation units be configured at least according to this many level pulses signal and at least one obtain operate relevant system status signal to this converter, and the Redundanter schalter state using these multiple switch elements to exist, come initiatively to produce the switching signal being supplied to the plurality of switch element.

2. electrical conversion systems as claimed in claim 1, it is characterized in that: this electrical conversion systems comprises at least one first flying capacitor and the second flying capacitor, this first flying capacitor and this second flying capacitor are connected between this first converter module and this second converter module, wherein, what these pulse pattern allocation units were configured at least to obtain according to one or more operates relevant striding capacitance voltage to this converter and produces the switching signal being supplied to the plurality of switch element, to balance the voltage of this first flying capacitor and this second flying capacitor at one or more control cycle.

3. electrical conversion systems as claimed in claim 1, it is characterized in that: what these pulse pattern allocation units were configured at least to obtain according to one or more operates relevant Warm status signal to this converter and produce the switching signal being supplied to the plurality of switch element, to reduce the thermal losses of one in the plurality of switch element or many persons at one or more control cycle.

4. a method, the method, for controlling the operation of converter in electrical conversion systems, is characterized in that: the method at least comprises the steps:

Produce many level pulses signal by modulator approach, waveform and this converter of this many level pulses signal expect that the waveform of the output obtained is corresponding; And

What at least obtain according to this many level pulses signal and one or more runs to this converter the switching signal that relevant system status signal active accommodation is supplied to multiple switch element in this variator.

5. an electrical conversion systems, is characterized in that: the controller that this electrical conversion systems comprises at least one convertor device and is connected with this at least one convertor device; This at least one convertor device comprises the first converter module and the second converter module, this first converter module and this second converter module are interconnected to form nested type mid point guide frame, and this first and second converter module each comprises multiple switch element; This controller is configured at least to send first group according to the first system status signal with the first numerical value and has the first unit switch state of switch signal to the multiple switch elements in this first and second converter module, makes this convertor device provide the output with instruction level grade; This controller is also configured at least to send second group according to the first system status signal with second value and has the second unit switch state of switch signal to the multiple switch elements in this first and second converter module, this convertor device is provided have the output of this same instructions level grade, this second unit switch state is not identical with this first unit switch state.

6. electrical conversion systems as claimed in claim 5, it is characterized in that: this controller is configured at least to send first group according to the second system status signal with the first numerical value and has the first unit switch state of switch signal to the multiple switch elements in this first and second converter module, makes this converter provide the output with instruction level grade; This controller is also configured at least to send second group according to the second system status signal with second value and has the second unit switch state of switch signal to the multiple switch elements in this first and second converter module, this convertor device is provided have the output of this same instructions level grade, this second unit switch state is not identical with this first unit switch state.

7. electrical conversion systems as claimed in claim 6, is characterized in that: this first system status signal and this second system status signal are configured to be optimized according to different priority.

8. an electrical conversion systems, is characterized in that: the controller that this electrical conversion systems comprises at least one convertor device and is connected with this at least one convertor device; This at least one convertor device comprises the first converter module, second converter module, first flying capacitor and the second flying capacitor, this first converter module and this second converter module are interconnected to form nested type mid point guide frame, first flying capacitor is connected with this first converter module and the second converter module with the second flying capacitor, and this first and second converter module each comprises multiple switch element; This controller comprises high order modulation unit and pulse pattern allocation units, and this high order modulation unit is configured to perform modulator approach to produce many level pulses signal, and this many level pulses signal has the corresponding waveform of output that to expect with this converter to obtain; These pulse pattern allocation units are configured at least measure according to this many level pulses signal and at least one this first flying capacitor of representative and the striding capacitance voltage state signal of the second flying capacitor within one or more cycle before of obtaining, and the Redundanter schalter state using these multiple switch elements to exist, produce the switching signal being supplied to the plurality of switch element.

9. an electrical conversion systems, is characterized in that: the controller that this electrical conversion systems comprises at least one convertor device and is connected with this at least one convertor device; This at least one convertor device comprises the first converter module, second converter module, first flying capacitor and the second flying capacitor, this first converter module and this second converter module are interconnected to form nested type mid point guide frame, first flying capacitor is connected with this first converter module and the second converter module with the second flying capacitor, and this first and second converter module each comprises multiple switch element; This controller comprises high order modulation unit and pulse pattern allocation units, and this high order modulation unit is configured to perform modulator approach to produce many level pulses signal, and this many level pulses signal has the corresponding waveform of output that to expect with this converter to obtain; These pulse pattern allocation units are configured at least predict according to this many level pulses signal and at least one this first flying capacitor of representative and the striding capacitance voltage state signal of the second flying capacitor within one or more cycle following of obtaining, and the Redundanter schalter state using these multiple switch elements to exist, produce the switching signal being supplied to the plurality of switch element.

10. a converter controller, it is for transmitting control signal at least one convertor device be connected with this converter controller, this at least one convertor device comprises the first converter module, second converter module, first flying capacitor and the second flying capacitor, this first converter module and this second converter module are interconnected to form nested type mid point guide frame, first flying capacitor is connected with this first converter module and the second converter module with the second flying capacitor, this first and second converter module each comprises multiple switch element, it is characterized in that: this converter controller comprises high order modulation unit and pulse pattern allocation units, this high order modulation unit is configured to perform modulator approach to produce many level pulses signal, and this many level pulses signal has the corresponding waveform of output that to expect with this converter to obtain, these pulse pattern allocation units are configured at least predict according to this many level pulses signal and at least one this first flying capacitor of representative and the striding capacitance voltage state signal of the second flying capacitor within one or more cycle following of obtaining, and the Redundanter schalter state using these multiple switch elements to exist, produce the switching signal being supplied to the plurality of switch element.