CN102468652A - Reactive power control system and control method thereof - Google Patents

Abstract

The invention discloses a reactive power control system and a control method thereof. The reactive power control system comprises an electric energy conversion device and a controller, wherein the electric energy conversion device is used for converting a first form electric energy output by a generating device into a second form electric energy which is suitable for power grid transmission; the controller is used for detecting the electric energy transmitted between the electric energy conversion device and the power grid, separating positive-sequence component and negative-sequence component from the detected electric energy, performing positive-sequence reactive power control for the positive-sequence component, performing negative-sequence reactive power control for the negative-sequence component, and transmitting a control signal to the electric energy conversion device based on positive-sequence and negative-sequence reactive power controls so as to make the electric power conversion device regulate the reactive power of the electric energy transmitted between the electric energy conversion device and the power grid.

Description

Power reactive power control system and control method thereof

Technical field

Relevant a kind of power reactive power control system of the present invention and control method thereof.

Background technology

Generally speaking, traditional TRT with coal as energy source.Consider in view of factors such as environmentally safe and sustainable regeneration, cause people's attention such as TRTs such as solar panel and wind turbines gradually.When the electric energy from the output of these TRTs is merged in electrical network when carrying,, need carry out Reactive Power Control to the electric energy of being exported usually in order to satisfy specific electrical network demand and to keep the stabilization of power grids.

Traditional Reactive Power Control is based on such hypothesis: for three-phase alternating current, electrical network keeps symmetry basically on three-phase.Under such hypothesis, the electric energy of negative phase-sequence is not considered in the control of reactive power through the electric energy that directly is adjusted in positive sequence output.Yet in uneven electrical network, traditional Reactive Power Control method no longer valid is because the component of negative phase-sequence can produce the disturbance of second order in the electric energy of output.Therefore, when not considering the Reactive Power Control of negative sequence component, such Reactive Power Control method seems accurate inadequately.

In addition, current have many countries all to require TRT when electrical network breaks down, still can keep and being connected of electrical network, and possesses the ability that low-voltage is passed through in other words.Yet when electrical network breaks down, carrying out accurately, Reactive Power Control seems more challenging.

Therefore, be necessary to provide a kind of power reactive power control system and control method thereof to solve above mentioned technical problem.

Summary of the invention

One aspect of the present invention is to provide a kind of power reactive power control system.This power reactive power control system comprises device for converting electric energy and controller.Device for converting electric energy is used for the electric energy of first kind of form exporting via TRT is converted to the electric energy of the second kind of form that is fit to the electrical network conveying.Controller is used to detect the electric energy that between device for converting electric energy and electrical network, transmits; Isolate positive sequence component and negative sequence component from the electric energy that detects; Positive sequence component is carried out the Reactive Power Control of positive sequence; Negative sequence component is carried out the Reactive Power Control of negative phase-sequence; And transmit control signal based on the Reactive Power Control of positive sequence and negative phase-sequence and give device for converting electric energy, so that device for converting electric energy is adjusted in the reactive power of the electric energy that transmits between device for converting electric energy and the electrical network.

Another aspect of the present invention is to provide a kind of Reactive Power Control method, is used for the electric energy that between TRT and electrical network, transmits is carried out Reactive Power Control.This Reactive Power Control method comprises the steps: to detect the electric energy that between this TRT and electrical network, transmits; Isolate positive sequence component and negative sequence component from detected electric energy; Positive sequence component is carried out the Reactive Power Control of positive sequence; Negative sequence component is carried out the Reactive Power Control of negative phase-sequence; And the reactive power that is adjusted in the electric energy that transmits between this TRT and the electrical network based on the Reactive Power Control of the Reactive Power Control of positive sequence and negative phase-sequence.

Another aspect of the present invention is to provide a kind of power reactive power control system, and this power reactive power control system comprises electric energy transducer and controller.Electric energy transducer comprises generator side converter and grid side converter, and this generator side converter and TRT electrically connect to be used for that the alternating current that this generator produces is transformed into direct current.This grid side converter is connected with electrical network to be used for converting this direct current to alternating current.Controller controllably connects this grid side converter, and controller is used to detect the alternating current that between this grid side converter and electrical network, transmits.Controller also is used for isolating the first sequence component and the second sequence component from detected alternating current, and this first sequence component is carried out first Reactive Power Control to produce first command signal and this second sequence component is carried out second Reactive Power Control to produce second command signal.Controller also is used to respond this first command signal and transmits control signal to this grid side converter, so that this grid side converter is adjusted in the reactive power of the alternating current that transmits between this grid side converter and this electrical network with this second command signal.

Power reactive power control system of the present invention and Reactive Power Control method; Through the electric energy of detected transmission to electrical network; And from detected electric energy, separate the different sequences component; And the different sequences component carried out corresponding Reactive Power Control respectively, thereby make the Reactive Power Control of system become more accurate.

Description of drawings

Describe for execution mode of the present invention in conjunction with the drawings, can understand the present invention better, in the accompanying drawings:

Shown in Figure 1 is the module map of a kind of execution mode of power reactive power control system of the present invention.

Shown in Figure 2 is the module map of a kind of execution mode of power reactive power control system middle controller of the present invention.

Shown in Figure 3 is the module map of a kind of execution mode of partial circuit in the controller shown in Figure 2.

Shown in Figure 4 is the module map of a kind of execution mode of forward-order current split circuit in the current separation circuit shown in Figure 3.

Shown in Figure 5 is the module map of a kind of execution mode of negative-sequence current split circuit in the current separation circuit shown in Figure 3.

Shown in Figure 6 is the module map of a kind of execution mode of first power calculation circuit in the power calculation circuit shown in Figure 3.

Shown in Figure 7 is the module map of a kind of execution mode of second power calculation circuit in the power calculation circuit shown in Figure 3.

Shown in Figure 8 is the module map that first positive sequence is regulated a kind of execution mode of module in the positive-sequence power adjuster shown in Figure 2.

Shown in Figure 9 is the module map that second positive sequence is regulated a kind of execution mode of module in the positive-sequence power adjuster shown in Figure 2.

Shown in Figure 10 is the module map that first negative phase-sequence is regulated a kind of execution mode of module in the negative sequence power adjuster shown in Figure 2.

Shown in Figure 11 is the module map that second negative phase-sequence is regulated a kind of execution mode of module in the negative sequence power adjuster shown in Figure 2.

Shown in Figure 12 is the module map of a kind of execution mode of current regulator in the controller shown in Figure 2.

Shown in Figure 13 is the module map of the another kind of execution mode of current separation circuit shown in Figure 3.

Shown in Figure 14 is the module map that first positive sequence is regulated the another kind of execution mode of module in the positive-sequence power adjuster shown in Figure 2.

Shown in Figure 15 is the module map that second positive sequence is regulated the another kind of execution mode of module in the positive-sequence power adjuster shown in Figure 2.

Shown in Figure 16 is the module map that second negative phase-sequence is regulated the another kind of execution mode of module in the negative sequence power adjuster shown in Figure 2.

Embodiment

Relevant power reactive power control system of several execution modes of the present invention and Reactive Power Control method.On the one hand, this power reactive power control system and Reactive Power Control method are isolated the component of positive sequence and the component of negative phase-sequence from the electric energy of system's output.Further; This power reactive power control system and Reactive Power Control method are carried out corresponding Reactive Power Control respectively to the component of positive sequence and the component of negative phase-sequence; With the reactive power of control system more accurately, thereby reach the unbalanced purpose of stablizing electrical network and alleviating electrical network.Because the reactive power of positive sequence and the reactive power of negative phase-sequence are independently controlled, and specially introduce a scientific terminology " vector Reactive Power Control " perhaps " adjusting of vector reactive power " at this.Be appreciated that the purpose of introducing these scientific terminologies is to understand for ease and remember, be not to be understood that to protection scope of the present invention is limited only within Reactive Power Control.For example, in one embodiment, " vector Reactive Power Control " perhaps " adjusting of vector reactive power " also may further include active power control or active power adjusting.

Only if define in addition, technical term that here uses or scientific terminology should be the ordinary meaning that the personage understood that has general technical ability in the affiliated field of the present invention.Any order, quantity or importance do not represented in " first " " second " of using in patent application specification of the present invention and claims and similar word, and just are used for distinguishing different parts.Equally, " one " perhaps similar words such as " one " does not represent restricted number yet, but there is at least one in expression.Only if point out separately, " front portion " " rear portion " " bottom " and/or similar words such as " tops " are for the ease of explanation, and are not limited to a position or a kind of spatial orientation." comprise " that similar word such as perhaps " comprising " means and appear at the element that perhaps " comprises " " comprising " front or object and contain and appear at " comprising " and perhaps " comprise " element or the object of enumerating the back and be equal to, and does not get rid of other elements or object." connection " similar word such as perhaps " link to each other " is not to be defined in connection physics or machinery, but can comprise electrical connection, no matter be directly or indirect.

Fig. 1 is the module map of the power reactive power control system 100 of one embodiment of the present invention.In execution mode shown in Figure 1, power reactive power control system 100 comprises TRT 10, device for converting electric energy 20, electrical network 30 and controller 40.Detailed content about power reactive power control system 100 each module will further be described hereinafter.

In execution mode shown in Figure 1, TRT 10 is used for producing from the obtainable energy electric energy 102 of first kind of form.In one embodiment, TRT 10 comprises generator, for example, and wind turbine or water turbine.Wind turbine is used for the wind energy of mechanical type is converted to the rotation ability of mechanical type, and the rotation of this mechanical type can be transformed into three-phase alternating current.Hydroelectric generator is used for converting the tidal energy of mechanical type to three-phase alternating current.Be appreciated that so-called three-phase alternating current just be used for the giving an example electric energy 102 of first kind of form here.In other embodiments, the electric energy 102 of first kind of form can also comprise many phase alternating current or direct current.In one embodiment, TRT 10 also can comprise by the solar panel of plurality of solar cells unit package at one-tenth.Solar panel is used for based on photoelectric effect solar energy converting being become direct current.

In execution mode shown in Figure 1, device for converting electric energy 20 electrically connects with TRT 10, to receive the electric energy 102 of first kind of form from TRT 10.Device for converting electric energy 20 is used for the electric energy 102 of first kind of form is converted to the electric energy 262 of second kind of form.In one embodiment; When TRT 10 comprises wind turbine; Device for converting electric energy 20 is configured to comprise generator side converter 22, grid side converter 26 and be electrically connected at generator side converter 22 and grid side converter 26 between DC link 24.Generator side converter 22 operates with the mode of rectifier, is used for converting three-phase alternating current 102 to direct current 222.Direct current 222 is sent to DC link 24.DC link 24 can comprise the capacitor that one or more is connected with series connection or parallel way.DC link 24 is used to alleviate the voltage fluctuation of DC link 24 when AC rectification.After this direct current 222 is transmitted to grid side converter 26.Grid side converter 26 operates with the mode of inverter, is used under the effect of controller 40, converting direct current 222 to three-phase alternating current 262 again.Next three-phase alternating current 262 is merged in electrical network 30 and transmits.In one embodiment; Generator side converter 22 and grid side converter 26 have the topological structure of three-phase two level; It comprises that several all adopt pulse width modulations (Pulse Width Modulation, PWM) semiconductor switch controlled of mode.In other embodiments, generator side converter 22 and grid side converter 26 also can have the topological structure of three-phase tri-level.These semiconductor switchs can adopt any suitable switch element, for example, and insulated gate bipolar transistor (Insulated Gate Bipolar Transistor; IGBTs); Gate change transistor (GateCommutated Thyristors, GCTs), metal-oxide layer-semiconductor-field-effect transistor; (Metal-Oxide-Semiconductor Field-Effect Transistors, MOSFETs).In another embodiment, when TRT 10 provided direct current through solar panel, the generator side converter 22 in the device for converting electric energy 20 also can save, and perhaps generator side converter 22 is configured to a DC-DC converter.

In execution mode shown in Figure 1, power reactive power control system 100 further comprises voltage detector 32, current detector 34 and dc voltage detector 50.Voltage detector 32 and current detector 34 all are electrically connected at the joint portion between grid side converter 26 and the electrical network 30.Voltage detector 32 is used for detecting system's output voltage 322 of the three-phase alternating current 262 that is sent to electrical network 30, and responds this system's output voltage 322 and provide reponse system voltage 324 to controller 40.In one embodiment, system's output voltage 322 can comprise the three-phase line voltage on the transmission line.In another embodiment, system's output voltage 322 also can be included in the voltage between lines that transmits on two transmission lines.Current detector 34 is used for detecting system's output current 342 of the three-phase alternating current 262 that is sent to electrical network 30, and responds this system's output current 342 and provide reponse system electric current 344 to controller 40.In one embodiment, system's output current 342 comprises the three-phase current that flows through on the transmission line.Dc voltage detector 50 is used for the direct voltage 222 of detection effect at DC link 24, and respond this direct voltage 222 provide the feedback direct voltage 502 to controller 40.

Controller 40 is based on reponse system voltage 324, system power 344 and direct voltage 502, and respond various system commands and come for grid side converter 26 control signal 408 to be provided.Here the various system commands of mentioning can comprise the reactive power instruction 402 of positive sequence, the reactive power instruction 404 of negative phase-sequence, and direct voltage instruction 406.Though possibly not be the emphasis that the present invention describes, the controller that controller 40 perhaps is provided with in addition itself can be used for control signal to generator side converter 22 being provided.Detailed content about controller 40 will further describe hereinafter.

Shown in Figure 2 is the module map of a kind of execution mode of controller 40 shown in Figure 1.In execution mode shown in Figure 2, controller 40 comprises voltage split circuit 42, current separation circuit 44, power calculation circuit 46, positive-sequence power adjuster 48, negative sequence power adjuster 52, current regulator 54 and pulse-width modulator 56.

As shown in Figure 2, voltage split circuit 42 electrically connects to receive reponse system voltage 324 from voltage detector 32 with voltage detector 32.Voltage split circuit 42 is used for isolating feedback positive sequence voltage component 422 and negative sequence voltage component 424 from reponse system voltage 324.In one embodiment, voltage split circuit 42 can comprise a cross-couplings phase-locked loop circuit 58 as shown in Figure 3.In two phase d-q reference frames of rotation synchronously, the feedback positive sequence voltage component 422 that separates from cross-couplings phase-locked loop circuit 58 comprises d axle positive sequence voltage 582 and q axle positive sequence voltage 584 (referring to Fig. 3).Similar ground, the feedback negative sequence voltage component 424 that separates from cross-couplings phase-locked loop circuit 58 comprises d axle negative sequence voltage 586 and q axle negative sequence voltage 588 (referring to Fig. 3).In one embodiment, cross-couplings phase-locked loop circuit 58 also is used for extracting from reponse system voltage 324 phase angle 428 of positive sequence phase angle 426 and negative phase-sequence.About the embodiment of cross-couplings phase-locked loop circuit 58, in one embodiment, can be with reference to assigning to the applicant identical with this case; By the United States Patent (USP) of people such as Wen Haiqing application, its patent No. is US 7,456; 695, the full content of this patent here is introduced into for referencial use.

In execution mode shown in Figure 2, current separation circuit 44 electrically connects to be used to receive the reponse system electric current 344 from current detector 34 outputs with current detector 34.The positive sequence phase angle 426 that current separation circuit 44 is used for extracting according to voltage split circuit 42 is isolated feedback forward-order current component 442 and feedback negative-sequence current component 444 with negative phase-sequence phase angle 428 from reponse system electric current 344.In execution mode shown in Figure 3, under the d-q reference frame, the d axle forward-order current 662 and the q axle forward-order current 624 that comprise from current separation circuit 44 isolated feedback forward-order current components 442.Similarly, the d axle negative-sequence current 626 and q axle negative-sequence current 628 that comprise from current separation circuit 44 isolated feedback negative-sequence current component 444.Detailed content about current separation circuit 44 will be described below.

In execution mode shown in Figure 2; Power calculation circuit 46 electrically connects with voltage split circuit 42 and current separation circuit 44, calculates with the positive-negative sequence current component and based on these positive-negative sequence electric current and voltage components with the positive-negative sequence component of voltage that is used to receive separation and gains merit and/or reactive power.In one embodiment, power calculation circuit 46 receives feedback positive sequence voltage 422, feedback negative sequence voltage 424, and feedback forward-order current 442 and feedback negative-sequence current 444 are to be used for calculating feedback positive sequence reactive power 462 and feedback negative phase-sequence reactive power 464.After obtaining feedback positive sequence reactive power 462 and feeding back negative phase-sequence reactive power 464, controller 40 can be carried out Reactive Power Control according to given positive sequence reactive power instruction 402 and negative phase-sequence reactive power instruction 404.In another embodiment, further with reference to figure 3, power calculation circuit 46 also can further be configured to calculate feedback positive sequence active power 466 and the Reactive Power Control of negative phase-sequence active power 468 to help execution positive sequence.Detail content about calculating above-mentioned positive-negative sequence reactive power will be described in more detail below.

In execution mode shown in Figure 2, positive-sequence power adjuster 48 electrically connects with power calculation circuit 46.Positive-sequence power adjuster 48 is used for receiving feedback positive sequence reactive power 462 and carrying out the positive sequence Reactive Power Control according to given positive sequence reactive power instruction 402 from power calculation circuit 46.Positive-sequence power adjuster 48 also is used to receive from the feedback direct voltage 502 of dc voltage detector 50 transmission and according to given direct voltage instruction 406 carries out the control of positive sequence active power.Positive-sequence power adjuster 48 is through carrying out positive sequence active power and Reactive Power Control output forward-order current instruction 482.The detailed content of carrying out the positive sequence Reactive Power Control about positive-sequence power adjuster 48 will be described below.

In execution mode shown in Figure 2, negative sequence power adjuster 52 is used to receive feedback negative sequence voltage 424 to carry out the Reactive Power Control of negative phase-sequence.Negative phase-sequence adjuster 52 can also receive the Reactive Power Control of carrying out negative phase-sequences from the feedback negative phase-sequence reactive power 464 of power calculation circuit 46 transmission and according to given negative phase-sequence reactive power instruction 404.Negative phase-sequence adjuster 52 is through carrying out the Reactive Power Control output negative current instructions 522 of negative phase-sequence.The detailed content of carrying out the negative phase-sequence Reactive Power Control about negative sequence power adjuster 52 will be described below.

In execution mode shown in Figure 2, current regulator 54 electrically connects with positive-sequence power adjuster 48 and negative sequence power adjuster 52, to be used to receive forward-order current instruction 482 and negative current instructions 522.Current regulator 54 can also connect current separation circuit 44, to be used for receiving feedback forward-order current 442 and feedback negative-sequence current 444.In one embodiment, current regulator 54 is according to 522 pairs of feedbacks of forward-order current instruction 482 and negative current instructions forward-order current 442, and feedback negative-sequence current 44 is handled, and obtains voltage command signal 540.Voltage command signal 540 is transmitted to pulse-width modulator 56, and pulse width-modulated device 56 is handled the controlled signal 408 in back.Control signal 408 can comprise the pulse signal with ON and OFF state, and control signal 408 is applied grid side converter 26 (with reference to figure 1) and produces the output current of expectation to drive grid side converter 26.

Shown in Figure 4 is the module map of a kind of execution mode of forward-order current split circuit 441 in the current separation circuit 44 shown in Figure 3.Forward-order current split circuit 441 is used for from reponse system electric current 344 from isolating the forward-order current component.In one embodiment, forward-order current split circuit 441 comprises positive-sequence coordinate inverting element 45, the first positive sequence low pass filters (Low Pass Filter, LPF) the 47 and second positive sequence low pass filter 49.Positive-sequence coordinate inverting element 45 is connected the reponse system electric current 344 that transmits from current sensor 34 to receive with current detector 34 (with reference to figure 1).Positive-sequence coordinate rotating element 45 rotates to two-phase with reponse system electric current 344 from three-phase, and particularly, positive-sequence coordinate rotating element 45 is according to positive sequence phase angle 426 output d axle forward-order currents 621 and q axle forward-order currents 623.In one embodiment, positive-sequence coordinate rotating element 45 can convert the reponse system electric current 344 of three-phase under the d-q coordinate system two-phase forward-order current component according to Matrix Formula (1) as follows:

$\left[\begin{array}{c}{I}_{\mathrm{dp}\_\mathrm{fbk}0}\\ I_{\mathrm{qp}\_\mathrm{fbk}0}\end{array}\right]=\left[\begin{array}{ccc}\frac{2}{3}\cos {\mathrm{\θ}}_p& -\frac{1}{3}\cos {\mathrm{\θ}}_p+\frac{\sqrt{3}}{3}\sin {\mathrm{\θ}}_p& -\frac{1}{3}\cos {\mathrm{\θ}}_p-\frac{\sqrt{3}}{3}\sin {\mathrm{\θ}}_p\\ -\frac{2}{3}\sin {\mathrm{\θ}}_p& \frac{1}{3}\sin {\mathrm{\θ}}_p+\frac{\sqrt{3}}{3}\cos {\mathrm{\θ}}_p& \frac{1}{3}\sin {\mathrm{\θ}}_p-\frac{\sqrt{3}}{3}\cos {\mathrm{\θ}}_p\end{array}\right]\left[\begin{array}{c}{I}_{a\_\mathrm{fbk}}\\ I_{b\_\mathrm{fbk}}\\ I_{c\_\mathrm{fbk}}\end{array}\right]---\left(1\right),$

Wherein, I _{Dp_fbk0}, I _{Qp_fbk0}Be respectively the d axle forward-order current 621 and q axle forward-order current 623 under the d-q coordinate system, θ _pBe positive sequence phase angle 426, I _{A_fbk}, I _{B_fbk}, I _{C_fbk}Be respectively three phase components of reponse system electric current 344.The first positive sequence low pass filter 47 with the radio-frequency component filtering in the d axle forward-order current 621 with output d axle forward-order current 622 (with reference to figure 3).The second positive sequence low pass filter 49 with the radio-frequency component filtering in the q axle forward-order current 623 with output q axle forward-order current 624 (with reference to figure 3).

Shown in Figure 5 is the module map of 443 1 kinds of execution modes of negative-sequence current split circuit in the current separation circuit shown in Figure 3.Negative-sequence current split circuit 443 is used for isolating from reponse system electric current 344 current component of negative phase-sequence.In one embodiment, negative-sequence current split circuit 443 comprises negative phase-sequence coordinate transform element 51, the first negative phase-sequence low pass filters 53 and the second negative phase-sequence low pass filter 55.Negative phase-sequence coordinate transform element 51 is connected the reponse system electric current 344 that transmits from current sensor 34 to receive with current detector 34 (with reference to figure 1).Negative phase-sequence rotation of coordinate element 51 rotates to two-phase with reponse system electric current 344 from three-phase, and particularly, negative phase-sequence rotation of coordinate element 51 is according to negative phase-sequence phase angle 428 output d axle negative-sequence currents 625 and q axle negative-sequence currents 627.In one embodiment, negative phase-sequence rotation of coordinate element 51 can convert the reponse system electric current 344 of three-phase under the d-q coordinate system two-phase negative-sequence current component according to Matrix Formula (2) as follows:

$\left[\begin{array}{c}{I}_{\mathrm{dn}\_\mathrm{fbk}0}\\ I_{\mathrm{qn}\_\mathrm{fbk}0}\end{array}\right]=\left[\begin{array}{ccc}\frac{2}{3}\cos {\mathrm{\θ}}_n& -\frac{1}{3}\cos {\mathrm{\θ}}_n+\frac{\sqrt{3}}{3}\sin {\mathrm{\θ}}_n& -\frac{1}{3}\cos {\mathrm{\θ}}_n-\frac{\sqrt{3}}{3}\sin {\mathrm{\θ}}_n\\ -\frac{2}{3}\sin {\mathrm{\θ}}_n& \frac{1}{3}\sin {\mathrm{\θ}}_n+\frac{\sqrt{3}}{3}\cos {\mathrm{\θ}}_n& \frac{1}{3}\sin {\mathrm{\θ}}_n-\frac{\sqrt{3}}{3}\cos {\mathrm{\θ}}_n\end{array}\right]\left[\begin{array}{c}{I}_{a\_\mathrm{fbk}}\\ I_{b\_\mathrm{fbk}}\\ I_{c\_\mathrm{fbk}}\end{array}\right]---\left(2\right),$

Wherein, I _{Dn_fbk0}, I _{Qn_fbk0}Be respectively the d axle negative-sequence current 625 and q axle negative-sequence current 627 under the d-q coordinate system, θ _nBe negative phase-sequence phase angle 428, I _{A_fbk}, I _{B_fbk}, I _{C_fbk}Be respectively three phase components of reponse system electric current 344.

The first negative phase-sequence low pass filter 53 with the radio-frequency component filtering in the d axle negative-sequence current 625 with output d axle negative-sequence current 626 (with reference to figure 3).The second negative phase-sequence low pass filter 55 with the radio-frequency component filtering in the q axle negative-sequence current 627 with output q axle negative-sequence current 628 (with reference to figure 3).

Shown in Figure 6 is the module map of 461 1 kinds of execution modes of the first power calculation module in the power calculation circuit 46 shown in Figure 3.The first power calculation module 461 is used for calculating feedback positive sequence reactive power 462 and feedback positive sequence active power 466 according to feedback positive sequence voltage 582,584 and feedback forward-order current 622,624.In one embodiment, the first power calculation module 461 comprises first multiplication element, 11, the second multiplication element 13; The 3rd multiplication element 15, the four multiplication element 17, the first summators 19; Second summator, 21, the first treatment elements 23 and second treatment element 25.First multiplication element 11 multiplies each other d axle positive sequence voltage 582 and d axle forward-order current 622, to obtain first product signal 112.Second multiplication element 13 multiplies each other q axle positive sequence voltage 584 and q axle forward-order current 624, to obtain second product signal 132.First summator 19 is with first product signal 112 and 132 additions of second product signal, to obtain summing signal 192.This summing signal 192 obtains feeding back positive sequence active power 466 after being handled by first treatment element 23.In one embodiment, first treatment element 23 is multiplied by specific a coefficient or a factor by the formula decision with summing signal 192, and for example 1.5.The 3rd multiplication element 15 multiplies each other d axle positive sequence voltage 582 and q axle forward-order current 624, to obtain the 3rd product signal 152.The 4th multiplication element 17 multiplies each other q axle positive sequence voltage 584 and d axle forward-order current 622, to obtain the 4th product signal 172.Second summator 21 deducts the 3rd product signal 152 from the 4th product signal 172, to obtain difference signal 212.This difference signal 212 obtains feeding back positive sequence reactive power 462 after being handled by second treatment element 25.Likewise, in one embodiment, second treatment element 25 is multiplied by specific a coefficient or a factor by the formula decision with difference signal 212, and for example 1.5.

Shown in Figure 7 is the module map of 463 1 kinds of execution modes of the second power calculation module in the power calculation circuit 46 shown in Figure 3.The second power calculation module 463 is used for calculating feedback negative phase-sequence reactive power 464 and feedback negative phase-sequence active power 468 according to feedback negative sequence voltage 586,588 and feedback negative-sequence current 626,628.In one embodiment, the second power calculation module 461 comprises first multiplication element, 27, the second multiplication element 29; The 3rd multiplication element 31, the four multiplication element 33, the first summators 35; Second summator, 37, the first treatment elements 39 and second treatment element 41.First multiplication element 27 multiplies each other d axle negative sequence voltage 586 and d axle negative-sequence current 626, to obtain first product signal 272.Second multiplication element 29 multiplies each other q axle negative sequence voltage 588 and q axle negative-sequence current 628, to obtain second product signal 292.First summator 39 is with first product signal 272 and 292 additions of second product signal, to obtain summing signal 352.This summing signal 352 obtains feeding back negative phase-sequence active power 468 after being handled by first treatment element 39.In one embodiment, first treatment element 39 is multiplied by specific a coefficient or a factor by the formula decision with summing signal 352, and for example 1.5.The 3rd multiplication element 31 multiplies each other d axle negative sequence voltage 626 and q axle negative-sequence current 628, to obtain the 3rd product signal 312.The 4th multiplication element 33 multiplies each other q axle negative sequence voltage 588 and d axle negative-sequence current 628, to obtain the 4th product signal 332.Second summator 37 deducts the 3rd product signal 312 from the 4th product signal 332, to obtain difference signal 372.This difference signal 372 obtains feeding back negative phase-sequence reactive power 464 after being handled by second treatment element 41.Likewise, in one embodiment, second treatment element 41 is multiplied by specific a coefficient or a factor by the formula decision with difference signal 372, and for example 1.5.

Shown in Figure 8 is the module map that first positive sequence is regulated a kind of execution mode of module 120 in the positive-sequence power adjuster 48 shown in Figure 2.First positive sequence is regulated module 120 and is used for regulating from the feedback direct voltage 502 of dc voltage detector 50 outputs according to given direct voltage instruction 406, and d axle forward-order current instruction 802 is provided.In one embodiment, first positive sequence adjusting module 120 comprises first summator 76, direct current voltage regulator 78 and the demand limiter 80 that is connected in series each other.First summator 76 is poor with feedback direct voltage 502 with given direct voltage instruction 406, to obtain difference voltage instruction 762.This difference voltage instruction 762 is converted to d axle forward-order current instruction 782 by direct current voltage regulator 78.Amplitude limitation is made in 80 pairs of d axles of demand limiter forward-order current instruction 782, is no more than the target d axle forward-order current instruction 802 of the working range of grid side converter 26 (referring to Fig. 1) with generation.

Shown in Figure 9 is the module map that second positive sequence is regulated a kind of execution mode of module 140 in the positive-sequence power adjuster 48 shown in Figure 2.Second positive sequence is regulated module 140 and is used for regulating from the feedback positive sequence reactive power 462 of power calculation circuit 46 outputs according to given positive sequence reactive power instruction 402, so that q axle forward-order current instruction 742 to be provided.In one embodiment, second positive sequence is regulated module 140 and is comprised first summator 66 that is connected in series each other, and idle adjuster 68, the second goes and element 70, voltage regulator 72 and demand limiter 74.First summator 66 is poor with feedback positive sequence reactive power 462 with given positive sequence reactive power instruction 402, to obtain difference positive sequence reactive power instruction 662.The reactive power adjusting is carried out in 68 pairs of difference reactive power instructions 662 of idle adjuster, and the voltage instruction 682 of output adjusting.Second summator 70 is poor with the amplitude 110 of feedback positive sequence voltage with the voltage instruction of regulating 682, to obtain difference regulation voltage instruction 702.The amplitude 110 of feedback positive sequence voltage can be tried to achieve through formula (1):

(3), wherein, V _{P_mag}Represent the amplitude 110 of positive sequence voltage, V _DpRepresent d axle positive sequence voltage 582, V _QpRepresent q axle positive sequence voltage 584.After 72 pairs of difference regulation voltage instructions 702 of voltage regulator are regulated q axle forward-order current instruction 722 is provided.Amplitude limitation is made in 74 pairs of q axles of demand limiter forward-order current instruction 722, is no more than the target q axle forward-order current instruction 742 of the working range of grid side converter 26 (referring to Fig. 1) with generation.

Shown in Figure 10 is the module map that first negative phase-sequence is regulated a kind of execution mode of module 260 in the negative sequence power adjuster 52 shown in Figure 2.First negative phase-sequence is regulated module 260 and is used to regulate q axle negative sequence voltage 588, so that d axle negative current instructions 105 to be provided.In one embodiment, first negative phase-sequence is regulated the inductance-ohmic load of module 260 simulation negative phase-sequences, for example, and the inductance of negative phase-sequence.First negative phase-sequence is regulated module 260 and is comprised the multiplication element 98 that is connected in series each other, filter 102 and limiter 104.Multiplication element 98 multiplies each other q axle negative sequence voltage 588 and q axle negative phase-sequence gain signal 230, to obtain d axle negative-sequence current 982.Filter 102 carries out filtering according to 250 pairs of d axles of q axis signal negative-sequence current 982, and filtered d axle negative current instructions 1022 is provided.Here, the q axis signal 250 of filter 102 inputs is imported to be used to indicate the bandwidth of filter 102 especially.D axle negative current instructions 1022 after 104 pairs of filterings of limiter is carried out amplitude limitation, so that d axle negative current instructions 105 to be provided.

Shown in Figure 11 is the module map that second negative phase-sequence is regulated a kind of execution mode of module 280 in the negative sequence power adjuster 52 shown in Figure 2.Second negative phase-sequence is regulated module 280 and is used to regulate d axle negative sequence voltage 586, so that q axle negative current instructions 113 to be provided.In one embodiment, second negative phase-sequence is regulated inductance-ohmic load that module 280 is also simulated negative phase-sequence, for example, and the inductance of negative phase-sequence.Second negative phase-sequence is regulated module 280 and is comprised the multiplication element 106 that is connected in series each other, filter 108 and limiter 112.Multiplication element 106 multiplies each other d axle negative sequence voltage 586 and d axle negative phase-sequence gain signal 270, to obtain q axle negative-sequence current 1062.Filter 108 carries out filtering according to 290 pairs of q axles of d axis signal negative-sequence current 1062, and filtered q axle negative current instructions 1082 is provided.Here, the d axis signal 290 of filter 108 inputs is also imported to be used to indicate the bandwidth of filter 108 especially.Q axle negative current instructions 1082 after 112 pairs of filterings of limiter is carried out amplitude limitation, so that q axle negative current instructions 113 to be provided.

Shown in Figure 12 is the module map of a kind of execution mode of current regulator 54 in the controller shown in Figure 2.Current regulator 54 is used for the positive-negative sequence current of the Control and Feedback positive sequence corresponding with it, and to need the difference between the current-order be zero when stable state.In one embodiment, current regulator 54 comprises forward-order current adjuster 128, negative-sequence current adjuster 134, the first summators 132, the second summators 138, sequence transformation element 136, and two-phase/three-phase inverter 142.

In execution mode shown in Figure 12, forward-order current adjuster 128 receives d axle forward-order current 622, q axle forward-order current 624, d axle forward-order current instruction 802, and q axle forward-order current instruction 742.Forward-order current adjuster 128 is regulated with q axle forward-order current 624 according to the instruction 802 of d axle forward-order current and q axle forward-order current instruction 742 pairs of d axle forward-order currents 622, so that d axle positive sequence voltage instruction the 1282 and the one q axle positive sequence voltage instruction 1284 to be provided.

In execution mode shown in Figure 12, negative-sequence current adjuster 134 receives d axle negative-sequence current 626, q axle negative-sequence current 628, d axle negative current instructions 105, and q axle negative current instructions 113.Negative-sequence current adjuster 134 is regulated according to d axle negative current instructions 105 and 113 pairs of d axles of q axle negative current instructions negative-sequence current 626 and q axle negative-sequence current 628, and instruction 1342 of d axle negative sequence voltage and q axle negative sequence voltage instruction 1344 are provided.Sequence transformation element 136 rotates to positive sequence with d axle negative sequence voltage instruction 1342 and the instruction of q axle negative sequence voltage 1344 from negative phase-sequence, and provides the 2nd d axle positive sequence voltage instruction the 1362 and the 2nd q axle positive sequence voltage to instruct 1364.In one embodiment, sequence transformation element 136 can convert the negative sequence voltage component under the d-q coordinate system to corresponding positive sequence voltage component according to Matrix Formula (4) as follows:

$\left[\begin{array}{c}{V}_{\mathrm{dp}\_\mathrm{cmd}2}\\ V_{\mathrm{qp}\_\mathrm{<figure-callout\; id="2"\; label="cmd"\; filenames="HSA00000362869800011.png"\; state="\{\{state\}\}">cmd</figure-callout>}2}\end{array}\right]=\left[\begin{array}{cc}\cos \mathrm{\&Delta;\&theta;}& \sin \mathrm{\&Delta;\&theta;}\\ -\sin \mathrm{\&Delta;\&theta;}& \cos \mathrm{\&Delta;\&theta;}\end{array}\right]\left[\begin{array}{c}{V}_{\mathrm{dn}\_\mathrm{cmd}}\\ V_{\mathrm{qn}\_\mathrm{cmd}}\end{array}\right]---\left(4\right),$

Wherein, V _{Dp_cmd2}Be the 2nd d axle positive sequence voltage instruction 1362, V _{Qp_cmd2}Be the 2nd q axle positive sequence voltage instruction 1364, Δ θ=θ _p-θ _n, θ _pBe positive sequence phase angle 426, θ _nBe negative phase-sequence phase angle 428, V _{Dn_cmd}Be d axle negative sequence voltage instruction 1342, V _{Qn_cmd}It is q axle negative sequence voltage instruction 1344.

Continue to consult execution mode shown in Figure 12, first summator is carried out add operation so that the 3rd d axle positive sequence voltage instruction 1322 to be provided to d axle positive sequence voltage instruction the 1282 and the 2nd d axle positive sequence voltage instruction 1362.138 pairs the one q axles of second summator positive sequence voltage instruction the 1284 and the 2nd q axle positive sequence voltage instruction 1364 is carried out add operation so that the 3rd q axle positive sequence voltage instruction 1382 to be provided.Two-phase/three-phase inverter 142 converts the 3rd d axle positive sequence voltage instruction the 1322 and the 3rd q axle positive sequence voltage instruction 1382 to three-phase from two-phase according to positive sequence phase angle 426, and provides three-phase voltage to instruct 542,544,546.In one embodiment, this two-phase/three-phase inverter 142 can convert the two-phase voltage instruction to the three-phase voltage instruction according to Matrix Formula (5) as follows:

$\left[\begin{array}{c}{U}_{a\_\mathrm{cmd}}\\ U_{b\_\mathrm{cmd}}\\ U_{c\_\mathrm{cmd}}\end{array}\right]=\left[\begin{array}{cc}\cos {\mathrm{\&theta;}}_p& -\sin {\mathrm{\&theta;}}_p\\ \cos ({\mathrm{\&theta;}}_p-\frac{2}{3}\mathrm{\&pi;})& -\sin ({\mathrm{\&theta;}}_p-\frac{2}{3}\mathrm{\&pi;})\\ \cos ({\mathrm{\&theta;}}_p+\frac{2}{3}\mathrm{\&pi;})& -\sin ({\mathrm{\&theta;}}_p+\frac{2}{3}\mathrm{\&pi;})\end{array}\right]\left[\begin{array}{c}{V}_{\mathrm{dp}\_\mathrm{cmd}3}\\ V_{\mathrm{qp}\_\mathrm{cmd}3}\end{array}\right]---\left(5\right),$

Wherein, U _{A_cmd}, U _{B_cmd}, U _{C_cmd}Be the three-phase voltage instruction 542,544,546 of voltage instruction 540, θ _pBe positive sequence phase angle 426, V _{Dp_cmd3}, V _{Qp_cmd3}It is respectively the 3rd d axle positive sequence voltage instruction the 1322 and the 3rd q axle positive sequence voltage instruction 1382 under the d-q coordinate system.Three-phase voltage instruction 542,544,546 affacts pulse-width modulator 56 to produce control signal 408.Grid side converter 26 is according to the electric current of these control signal 408 output expectations.

As stated, controller 40 can be isolated the voltage and current component of positive sequence and the voltage and current component of negative phase-sequence from the electric energy that is sent to electrical network 30 when running.In the embodiment that is disclosed, on the one hand, controller 40 can calculate the reactive power of positive sequence according to positive sequence voltage that separates and current component, and according to the reactive power of the voltage and current component calculating negative phase-sequence of the negative phase-sequence of separating.Because the reactive power of positive sequence and the reactive power of negative phase-sequence can independently be calculated, so controller 40 further can carry out the independently Reactive Power Control of positive sequence Reactive Power Control and negative phase-sequence respectively on positive-negative sequence.Thus, the reactive power of positive sequence and the reactive power of negative phase-sequence all can be regulated, thereby the reactive power that is sent to the electric energy of electrical network 30 can be regulated more accurately.

Shown in Figure 13 is the module map of the another kind of execution mode of current separation circuit 44 shown in Figure 3.In one embodiment, current separation circuit 44 comprises three-phase/two phasing commutators, 63, the first summators, 65, the second summators 67; The first positive-sequence coordinate inverting element, 69, the first positive sequence low pass filters, 71, the second positive sequence low pass filters, 73, the second positive-sequence coordinate inverting elements 75; The 3rd summator 77, the four summators 79, the first negative phase-sequence coordinate transform elements 81; The first negative phase-sequence low pass filter, 83, the second negative phase-sequence low pass filters 85, and the second negative phase-sequence coordinate transform element 87.Three-phase/two phasing commutators 63 are connected with current detector 34, to receive from the reponse system electric current 344 of current detector 34 outputs.Current separation circuit 44 is configured to cross-linked mode.Particularly, two of the second positive-sequence coordinate inverting element 75 outputs are connected respectively to the 3rd summator 77 and the 4th summator 79.In addition, two output cups of the second negative phase-sequence coordinate transform element 87 are connected respectively to first summator 65 and second summator 67.

In one embodiment, three-phase/two phasing commutators 63 become two-phase with three-phase reponse system electric current 344 from three-phase inversion, also promptly, α axle feedback current 632 and β axle feedback current 634 are provided.In one embodiment, three-phase/two phasing commutators 63 can convert three-phase reponse system electric current 344 under the alpha-beta coordinate system two phase components according to Matrix Formula (6) as follows:

$\left[\begin{array}{c}{I}_{\mathrm{\&alpha;}\_\mathrm{fbk}}\\ I_{\mathrm{\&beta;}\_\mathrm{fbk}}\end{array}\right]=\left[\begin{array}{ccc}\frac{2}{3}& -\frac{1}{3}& -\frac{1}{3}\\ 0& \frac{\sqrt{3}}{3}& -\frac{\sqrt{3}}{3}\end{array}\right]\left[\begin{array}{c}{I}_{a\_\mathrm{fbk}}\\ I_{b\_\mathrm{fbk}}\\ I_{c\_\mathrm{fbk}}\end{array}\right]---\left(6\right),$

Wherein, I _{α _ fbk}, I _{β _ fbk}Be respectively the α axle feedback current 632 and β axle feedback current 634 under the alpha-beta coordinate system, I _{A_fbk}, I _{B_fbk}, I _{C_fbk}Be respectively three phase components of reponse system electric current 344.

Because the second negative phase-sequence coordinate transform element, 87 output α axle negative phase-sequence feedback currents 872 and β axle negative phase-sequence feedback current 874; 65 pairs of α axles of first summator feedback current 632 is carried out subtraction with α axle negative phase-sequence feedback current 872, and α axle positive sequence feedback current 652 is provided.67 pairs of β axles of second summator feedback current 634 is carried out subtraction with β axle negative phase-sequence feedback current 874, and β axle positive sequence feedback current 672 is provided.The first positive-sequence coordinate inverting element 69 rotates to component corresponding under the d-q coordinate system according to positive sequence phase angle 426 with α axle positive sequence feedback current under the alpha-beta coordinate system 652 and β axle positive sequence feedback current 672, with output d axle forward-order current 622 and q axle forward-order current 624.In one embodiment, the first positive-sequence coordinate inverting element 69 can rotate to the two-phase forward-order current under the d-q coordinate system with the two-phase forward-order current under the alpha-beta coordinate system according to Matrix Formula (7) as follows:

$\left[\begin{array}{c}{I}_{\mathrm{dp}\_\mathrm{fbk}}\\ I_{\mathrm{qp}\_\mathrm{fbk}}\end{array}\right]=\left[\begin{array}{cc}\cos {\mathrm{\&theta;}}_p& \sin {\mathrm{\&theta;}}_p\\ -\sin {\mathrm{\&theta;}}_p& \cos {\mathrm{\&theta;}}_p\end{array}\right]\left[\begin{array}{c}{I}_{\mathrm{\&alpha;p}\_\mathrm{fbk}0}\\ I_{\mathrm{\&beta;p}\_\mathrm{fbk}0}\end{array}\right]---\left(7\right),$

Wherein, I _{Dp_fbk}, I _{Qp_fbk}Be respectively the d axle forward-order current 622 and q axle forward-order current 624 under the d-q coordinate system, θ _pBe positive sequence phase angle 426, I _{α p_fbk0}, I _{β p_fbk0}Be respectively the α axle positive sequence feedback current 652 and β axle positive sequence feedback current 672 under the alpha-beta coordinate system.The first positive sequence low pass filter 71 and the second positive sequence low pass filter 73 are respectively with the radio-frequency component filtering in d axle forward-order current 622 and the q axle forward-order current 624, with the d axle forward-order current 712 of output filtering and the q axle forward-order current 732 of filtering.The second positive-sequence coordinate inverting element 75 rotates to component corresponding under the alpha-beta coordinate system with d axle forward-order current under the d-q coordinate system 712 and q axle forward-order current 732 again according to positive sequence phase angle 426, with output α axle positive sequence feedback current 752 and β axle positive sequence feedback current 754.In one embodiment, the second positive-sequence coordinate inverting element 75 can rotate to the two-phase forward-order current under the alpha-beta coordinate system with the two-phase forward-order current under the d-q coordinate system according to Matrix Formula (8) as follows:

$\left[\begin{array}{c}{I}_{\mathrm{\&alpha;p}\_\mathrm{fbk}1}\\ I_{\mathrm{\&beta;p}\_\mathrm{fbk}1}\end{array}\right]=\left[\begin{array}{cc}\cos {\mathrm{\&theta;}}_p& -\sin {\mathrm{\&theta;}}_p\\ \sin {\mathrm{\&theta;}}_p& \cos {\mathrm{\&theta;}}_p\end{array}\right]\left[\begin{array}{c}{I}_{\mathrm{dp}\_\mathrm{fbk}}\\ I_{\mathrm{qp}\_\mathrm{fbk}}\end{array}\right]---\left(8\right),$

Wherein, I _{α p_fbk1}, I _{β p_fbk1}Be respectively the α axle positive sequence feedback current 752 and β axle positive sequence feedback current 754 under the alpha-beta coordinate system, θ _pBe positive sequence phase angle 426, I _{α p_fbk0}, I _{β p_fbk0}Be respectively the d axle forward-order current 712 and q axle forward-order current 732 under the d-q coordinate system.In one embodiment, d axle forward-order current 622 is sent to power calculation circuit 46 (consulting Fig. 3) to calculate instantaneous active power and the reactive power under the positive sequence with q axle forward-order current 624.Be appreciated that in other embodiments, also can the d axle forward-order current 712 of filtering and the q axle forward-order current 732 of filtering be sent to power calculation unit 46 (consulting Fig. 3), to calculate instantaneous active power and the reactive power under the positive sequence.

Further consult execution mode shown in Figure 13; Because the second positive-sequence coordinate inverting element, 75 output α axle positive sequence feedback currents 752 and β axle positive sequence feedback current 754; 77 pairs of α axles of the 3rd summator feedback current 632 is carried out subtraction with α axle positive sequence feedback current 752, with output α axle negative phase-sequence feedback current 772.79 pairs of β axles of the 4th summator feedback current 634 is carried out subtraction with β axle positive sequence feedback current 754, with output β axle negative phase-sequence feedback current 792.The first negative phase-sequence coordinate transform element 81 rotates to component corresponding under the d-q coordinate system according to negative phase-sequence phase angle 428 with α axle negative phase-sequence feedback current under the alpha-beta coordinate system 772 and β axle negative phase-sequence feedback current 792, with output d axle negative-sequence current 626 and q axle negative-sequence current 628.In one embodiment, the first negative phase-sequence coordinate transform element 81 can rotate to the two-phase negative-sequence current under the d-q coordinate system with the two-phase negative-sequence current under the alpha-beta coordinate system according to Matrix Formula (9) as follows:

$\left[\begin{array}{c}{I}_{\mathrm{dn}\_\mathrm{fbk}}\\ I_{\mathrm{qn}\_\mathrm{fbk}}\end{array}\right]=\left[\begin{array}{cc}\cos {\mathrm{\&theta;}}_n& \sin {\mathrm{\&theta;}}_n\\ -\sin {\mathrm{\&theta;}}_n& \cos {\mathrm{\&theta;}}_n\end{array}\right]\left[\begin{array}{c}{I}_{\mathrm{\&alpha;n}\_\mathrm{fbk}0}\\ I_{\mathrm{\&beta;n}\_\mathrm{fbk}0}\end{array}\right]---\left(9\right),$

Wherein, I _{Dn_fbk}, I _{Qn_fbk}Be respectively the d axle negative-sequence current 626 and q axle negative-sequence current 628 under the d-q coordinate system, θ _nBe negative phase-sequence phase angle 428, I _{α n_fbk0}, I _{β n_fbk0}Be respectively the α axle negative phase-sequence feedback current 772 and β axle negative phase-sequence feedback current 792 under the alpha-beta coordinate system.The first negative phase-sequence low pass filter 83 and the second negative phase-sequence low pass filter 85 are respectively with the radio-frequency component filtering in d axle negative-sequence current 626 and the q axle negative-sequence current 628, with the d axle negative-sequence current 832 of output filtering and the q axle negative-sequence current 852 of filtering.The second negative phase-sequence coordinate transform element 87 rotates to component corresponding under the alpha-beta coordinate system with d axle negative-sequence current under the d-q coordinate system 832 and q axle negative-sequence current 852 again according to negative phase-sequence phase angle 428, with output α axle negative phase-sequence feedback current 872 and β axle negative phase-sequence feedback current 874.In one embodiment, the second negative phase-sequence coordinate transform element 87 can rotate to the two-phase forward-order current under the alpha-beta coordinate system with the two-phase forward-order current under the d-q coordinate system according to Matrix Formula (10) as follows:

$\left[\begin{array}{c}{I}_{\mathrm{\&alpha;n}\_\mathrm{fbk}1}\\ I_{\mathrm{\&beta;n}\_\mathrm{fbk}1}\end{array}\right]=\left[\begin{array}{cc}\cos {\mathrm{\&theta;}}_n& -\sin {\mathrm{\&theta;}}_n\\ \sin {\mathrm{\&theta;}}_n& \cos {\mathrm{\&theta;}}_n\end{array}\right]\left[\begin{array}{c}{I}_{\mathrm{dn}\_\mathrm{fbk}}\\ I_{\mathrm{qn}\_\mathrm{fbk}}\end{array}\right]---\left(10\right),$

Wherein, I _{α n_fbk1}, I _{β n_fbk1}Be respectively the α axle negative phase-sequence feedback current 872 and β axle negative phase-sequence feedback current 874 under the alpha-beta coordinate system, θ _nBe negative phase-sequence phase angle 428, I _{Dn_fbk}, I _{Qn_fbk}Be respectively the d axle negative-sequence current 832 and q axle negative-sequence current 852 under the d-q coordinate system.

In one embodiment, d axle negative-sequence current 626 is sent to power calculation circuit 46 (consulting Fig. 3) to calculate instantaneous active power and the reactive power under the negative phase-sequence with q axle negative-sequence current 628.Be appreciated that in other embodiments, also can the d axle negative-sequence current 832 of filtering and the q axle negative-sequence current 852 of filtering be sent to power calculation unit 46 (consulting Fig. 3), to calculate instantaneous active power and the reactive power under the negative phase-sequence.

In other embodiments; Controller 40 in the power reactive power control system 100 can also further be arranged to have the voltage ride-through capability, and is taking place that " vector Reactive Power Control " perhaps " adjusting of vector reactive power " function is provided when voltage passes through situation simultaneously.Be appreciated that; So-called here " voltage passes through " comprise low-voltage pass through (Low Voltage Ride Through, LVRT), no-voltage is passed through (ZeroVoltage Ride Through; ZVRT) and high voltage pass through (High Voltage Ride Through, HVRT).

Shown in Figure 14 is the module map that first positive sequence is regulated the another kind of execution mode of module 220 in the positive-sequence power adjuster 48 shown in Figure 2.First positive sequence is regulated module 220 and is used for further when taking place voltage and passes through situation current-order is provided.In one embodiment, first positive sequence adjusting module 220 comprises first summator 76, direct current voltage regulator 78, the second summators 96, the first demand limiters 80, multiplication element 88, filter 92 and second demand limiter 94.

Shown in the below of Figure 14, first summator 76 will feed back direct voltage 502 and from direct voltage instruction 406, deduct, so that difference direct voltage instruction 762 to be provided.78 pairs of difference direct voltage instructions 762 of direct current voltage regulator are regulated so that strange land d axle positive sequence electric power instruction 782 to be provided.Shown in the top of Figure 14, multiplication element 88 multiplies each other q axle positive sequence voltage 584 and q axle gain signal 190, and d axle forward-order current 882 is provided.Filter 92 carries out filtering according to 210 pairs of d axles of q axis signal forward-order current 882, so that the d axle forward-order current instruction 922 of filtering to be provided.Should be appreciated that the q axis signal of importing 210 is used to indicate the bandwidth of filter 92 here.Amplitude limitation is carried out in the d axle forward-order current instruction 922 of 94 pairs of filtering of second limiter, and the 2nd d axle forward-order current instruction 942 is provided.Add operation is carried out in 96 pairs the one d axles of second summator forward-order current instruction the 782 and the 2nd d axle forward-order current instruction 942, so that the 3rd d axle forward-order current instruction 962 to be provided.Amplitude limitation is carried out in 80 pairs the 3rd d axles of first demand limiter forward-order current instruction 962, and amplitude limit d axle forward-order current instruction 802 is provided.This amplitude limit d axle forward-order current instruction 802 is sent to forward-order current adjuster 128.

Shown in Figure 15 is the module map that second positive sequence is regulated the another kind of execution mode of module 240 in the positive-sequence power adjuster 48 shown in Figure 2.Second positive sequence is regulated module 240 and is further used for taking place that current-order is provided when voltage passes through situation.In one embodiment, second positive sequence adjusting module 240 comprises first summator 66, idle adjuster 68; Second summator 70, voltage regulator 72, the three summators 77; Voltage limitator 75, booster element 82, filter 84; First demand limiter, 86, the four summators 73 and second demand limiter 74.

In upper branch shown in Figure 15, first summator 66 will feed back positive sequence reactive power 462 and from positive sequence reactive power instruction 402, deduct, so that difference positive sequence reactive power instruction 662 to be provided.68 pairs of difference positive sequence of reactive power regulator reactive power instruction 662 is regulated, and the positive sequence voltage instruction 682 after the adjusting is provided.In one embodiment, reactive power regulator 68 can comprise pi controller.In other embodiments, also can use the controller of other types, for example, proportional plus derivative controller and proportional plus integral plus derivative controller.Second summator 70 is with deducting the positive sequence voltage instruction 682 of positive sequence voltage amplitude 110 after regulating, so that difference positive sequence voltage instruction 702 to be provided.Positive sequence voltage amplitude 110 can be calculated through the formula of when describing execution mode shown in Figure 9, using (3).Voltage regulator 72 is further regulated difference positive sequence voltage instruction 702, so that q axle forward-order current instruction 722 to be provided.In one embodiment, voltage regulator 72 can comprise pi controller.In other embodiments, also can use the controller of other types, for example, proportional plus derivative controller and proportional plus integral plus derivative controller.

In lower leg shown in Figure 15,75 pairs of d axles of voltage limitator positive sequence voltage 582 carries out amplitude limitation, and amplitude limit d axle positive sequence voltage 752 is provided.The 3rd summator 77 deducts amplitude limit d axle positive sequence voltage 752 from d axle positive sequence voltage 582, to obtain difference d axle positive sequence voltage 772.Booster element 82 multiplies each other difference d axle positive sequence voltage 772 and d axle gain signal 150, to obtain q axle forward-order current 822.Filter 84 carries out filtering according to 170 pairs of q axles of d axis signal forward-order current 822, so that the q axle forward-order current instruction 842 of filtering to be provided.Should be appreciated that the d axis signal of importing 170 is used for indicating the bandwidth of filter 84 here.Amplitude limitation is carried out in the q axle forward-order current instruction 842 of 86 pairs of filtering of first demand limiter, so that the 2nd q axle forward-order current instruction 862 to be provided.Add operation is carried out in 73 pairs the one q axles of the 4th summator forward-order current instruction the 722 and the 2nd q axle forward-order current instruction 862, and the 3rd q axle forward-order current instruction 732 is provided.Amplitude limitation is carried out in 74 pairs the 3rd q axles of second demand limiter forward-order current instruction 732, and amplitude limit q axle forward-order current instruction 742 is provided.Amplitude limit q axle forward-order current instruction 742 is sent to forward-order current adjuster 128.

Shown in Figure 16 is the module map that second negative phase-sequence is regulated the another kind of execution mode of module 340 in the negative sequence power adjuster 52 shown in Figure 2.Second negative phase-sequence is regulated module 340 and is used for d axle negative sequence voltage 586 is regulated, and further regulates according to 404 pairs of feedbacks of negative phase-sequence reactive power instruction negative phase-sequence reactive power 464, so that q axle negative current instructions 1262 to be provided.In one embodiment, second negative phase-sequence adjusting module 340 comprises multiplication element 106, filter 108; First limiter, 112, the first adding elements 114, idle adjuster 116; Second summator 118, voltage regulator 122, the three summators 124 and second demand limiter 126.

In upper branch shown in Figure 16, multiplication element 106 multiplies each other d axle negative sequence voltage 584 and d axle gain signal 270, and the d axle negative sequence voltage 1062 that multiplies each other is provided.Filter 108 is handled according to the d axle negative sequence voltage 1062 that 290 pairs of d axis signals multiply each other, so that a q axle negative current instructions 1082 to be provided.112 pairs of q axles of first limiter negative current instructions 1082 is carried out amplitude limitation, and a q axle negative current instructions 1122 of amplitude limit is provided.

In lower leg shown in Figure 16, first summator 114 will feed back negative phase-sequence reactive power 464 and from negative phase-sequence reactive power instruction 404, deduct, and difference negative phase-sequence reactive power instruction 1142 is provided.116 pairs of difference negative phase-sequences of idle adjuster reactive power instruction 1142 is regulated, and the negative sequence voltage instruction 1162 of adjusting is provided.Second summator 118 is with deducting the negative sequence voltage instruction 1162 of negative sequence voltage amplitude 350 after regulating, so that difference negative sequence voltage instruction 1182 to be provided.Negative sequence voltage amplitude 350 can be calculated through formula (2),

(11), wherein, V _{N_mag}Represent the amplitude 350 of negative sequence voltage, V _DnRepresent d axle negative sequence voltage 586, V _QnRepresent q axle negative sequence voltage 588.Voltage regulator 122 is further regulated difference positive sequence voltage instruction 1182, so that the 2nd q axle negative current instructions 1222 to be provided.Negative current instructions 1222 is carried out add operation behind 124 pairs the one q axles of the 3rd summator negative current instructions 1122 and the 2nd q, so that the 3rd q axle negative current instructions 1242 to be provided.126 pairs the 3rd q axles of second demand limiter negative current instructions 1242 is carried out amplitude limitation, so that amplitude limit q axle negative current instructions 1262 to be provided.This amplitude limit q axle negative current instructions 1262 is sent to carries out Current Regulation in the negative-sequence current adjuster 134.

Be appreciated that controller 40 can realize in several ways.For example; Controller 40 can be realized through the mode of hardware line or realize through the mode of on general-purpose computations, moving computer program; The all-purpose computer here can pass through input/output interface and voltage detector 32, and current detector 34 and dc voltage detector 50 are connected.

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

Claims (19)

1. a power reactive power control system is characterized in that, this power reactive power control system comprises:

Device for converting electric energy, this device for converting electric energy are connected between TRT and the electrical network, and this device for converting electric energy is used for the electric energy of first kind of form exporting via this TRT is converted to the electric energy of the second kind of form that is fit to the electrical network conveying; And

Controller, this controller is connected with this device for converting electric energy, and this controller is used for:

The electric energy that detection is transmitted between this device for converting electric energy and this electrical network;

Isolate positive sequence component and negative sequence component from the electric energy that detects;

Positive sequence component is carried out the Reactive Power Control of positive sequence;

Negative sequence component is carried out the Reactive Power Control of negative phase-sequence; And

Transmit control signal to this device for converting electric energy, so that this device for converting electric energy is adjusted in the reactive power of the electric energy that transmits between this device for converting electric energy and this electrical network based on the Reactive Power Control of this positive sequence and the Reactive Power Control of negative phase-sequence.

2. power reactive power control system as claimed in claim 1; It is characterized in that: this controller is further used for the active power of positive sequence component execution positive sequence is controlled and the active power of negative sequence component execution negative phase-sequence is controlled, and this controller is further used for using the active power control of this positive sequence and the active power of negative phase-sequence to control this control signal of generation.

3. power reactive power control system as claimed in claim 1; It is characterized in that: this TRT comprises generator; This device for converting electric energy comprises generator side converter and grid side converter; This generator side converter electrically connects this generator; This generator side converter is used for the alternating current that this generator produces is transformed into direct current, and this grid side converter electrically connects this electrical network, and this grid side converter is used to respond this control signal that transmits from this controller this direct current is transformed into alternating current.

4. power reactive power control system as claimed in claim 3; It is characterized in that: this electric energy transducer further comprises the DC link that is connected between this generator side converter and this grid side converter; This power reactive power control system further comprises dc voltage detector; This dc voltage detector is used for the direct voltage of detection effect at this DC link, and this controller is further used for using the detected direct voltage of this dc voltage detector to produce this control signal.

5. power reactive power control system as claimed in claim 1; It is characterized in that: this power reactive power control system further comprises voltage detector and current detector; This voltage detector is used to detect the voltage of the electric energy that between this device for converting electric energy and this electrical network, transmits, and this current detector is used to detect the electric current of the electric energy that between this device for converting electric energy and this electrical network, transmits.

6. power reactive power control system as claimed in claim 5; It is characterized in that: this controller comprises cross-couplings phase-locked loop circuit and current separation circuit; This cross-couplings phase-locked loop circuit is used for isolating from the detected voltage of this voltage detector the component of voltage of positive sequence; The component of voltage of negative phase-sequence; The phase angle of positive sequence and the phase angle of negative phase-sequence, this current separation circuit are used for going out the current component of positive sequence and the current component of negative phase-sequence according to the phase angle of the phase angle of this positive sequence and negative phase-sequence from the detected current separation of this current detector.

7. power reactive power control system as claimed in claim 6; It is characterized in that: this controller further comprises power calculation unit; This power calculation unit is used for calculating feedback positive sequence reactive power according to the current component of the component of voltage of this positive sequence and positive sequence, and this power calculation unit also is used for calculating feedback negative phase-sequence reactive power according to the component of voltage of negative phase-sequence and the current component of negative phase-sequence.

8. power reactive power control system as claimed in claim 7; It is characterized in that: this controller further comprises the positive-sequence power adjuster; Forward-order current adjuster and pulse-width modulator; This positive-sequence power adjuster is used for producing d axle forward-order current instruction according to the direct voltage of the detected DC link of this dc voltage detector and given direct voltage instruction; This positive-sequence power adjuster also is used for according to this feedback positive sequence reactive power and given positive sequence reactive power command calculations the one q axle forward-order current instruction; This forward-order current adjuster is used for d axle forward-order current instruction is become instruction of d axle positive sequence voltage and the instruction of q axle positive sequence voltage with a q axle forward-order current instruction transformation; And the instruction of this d axle positive sequence voltage become voltage command signal with q axle positive sequence voltage instruction transformation, this pulse-width modulator provides this control signal according to this voltage command signal.

9. power reactive power control system as claimed in claim 8; It is characterized in that: this positive-sequence power adjuster is further used for producing the 2nd q axle forward-order current instruction when d axle positive sequence voltage generation voltage passes through situation detecting; This positive-sequence power adjuster also is used for q axle forward-order current instruction and the 2nd q axle forward-order current instruction summation are instructed to produce the 3rd q axle forward-order current; This positive-sequence power adjuster further also is used for producing the 2nd d axle forward-order current instruction when q axle positive sequence voltage generation voltage passes through situation detecting; This positive-sequence power adjuster also is used for d axle forward-order current instruction and the 2nd d axle forward-order current instruction summation are instructed to produce the 3rd d axle forward-order current, and this forward-order current adjuster further also is used for the instruction of the 3rd d axle forward-order current is become this d axle positive sequence voltage instruction and the instruction of q axle positive sequence voltage with the 3rd q axle forward-order current instruction transformation.

10. power reactive power control system as claimed in claim 7; It is characterized in that: this controller further comprises the negative sequence power adjuster; Negative-sequence current adjuster and pulse-width modulator; This negative sequence power adjuster is used for producing a d axle negative current instructions according to detected q axle negative sequence voltage; This negative sequence power adjuster also is used for producing a q axle negative current instructions according to detected d axle negative sequence voltage; This negative-sequence current adjuster is used for a d axle negative current instructions is become instruction of d axle negative sequence voltage and the instruction of q axle negative sequence voltage with a q axle forward-order current instruction transformation; Instruction rotates to the corresponding voltage instruction of positive sequence with q axle negative sequence voltage with the instruction of this d axle negative sequence voltage, and instructs at the d of positive sequence axle negative sequence voltage with postrotational that instruction map becomes voltage instruction with q axle negative sequence voltage, and this pulse-width modulator provides this control signal according to this voltage instruction.

11. power reactive power control system as claimed in claim 10; It is characterized in that: this negative sequence power adjuster is further used for difference between feedback negative phase-sequence inactivity and the instruction of given negative phase-sequence reactive power and produces the 2nd q axle negative current instructions when non-vanishing; This negative sequence power adjuster is used for a q axle negative current instructions and the 2nd q axle negative current instructions are sued for peace to produce the 3rd q axle negative current instructions, and this negative sequence power adjuster is further used for converting the 3rd q axle negative current instructions to this q axle negative sequence voltage instruction.

12. a Reactive Power Control method is used for the electric energy that between TRT and electrical network, transmits is carried out Reactive Power Control, it is characterized in that: this Reactive Power Control method comprises:

The electric energy that detection is transmitted between this TRT and electrical network;

Isolate positive sequence component and negative sequence component from detected electric energy;

Positive sequence component is carried out the Reactive Power Control of positive sequence;

Negative sequence component is carried out the Reactive Power Control of negative phase-sequence; And

Be adjusted in the reactive power of the electric energy that transmits between this TRT and the electrical network based on the Reactive Power Control of the Reactive Power Control of this positive sequence and this negative phase-sequence.

13. Reactive Power Control method as claimed in claim 12 is characterized in that: this Reactive Power Control method also comprises:

Positive sequence component is carried out the active power control of positive sequence; And

Negative sequence component is carried out the active power control of negative phase-sequence.

14. Reactive Power Control method as claimed in claim 12 is characterized in that: wherein should isolate positive sequence component and the negative sequence component step comprises from detected electric energy:

From the voltage of this detected electric energy, isolate the positive sequence voltage component, negative sequence voltage component, the phase angle of positive sequence and the phase angle of negative phase-sequence;

Use the phase angle of this positive sequence and the phase angle of this negative phase-sequence from the electric current of this detected electric energy, to isolate forward-order current component and negative-sequence current component; And

Use the positive sequence voltage component that separates, the negative sequence voltage component, forward-order current component and negative-sequence current component are calculated feedback positive sequence reactive power and feedback negative phase-sequence reactive power.

15. Reactive Power Control method as claimed in claim 14 is characterized in that: the step of positive sequence component being carried out the Reactive Power Control of positive sequence comprises:

Produce d axle forward-order current instruction according to the direct voltage of DC link in the detected device for converting electric energy and given direct voltage instruction;

The feedback positive sequence reactive power and the given positive sequence reactive power that get according to calculating produce q axle forward-order current instruction;

Regulate d axle forward-order current instruction and q axle forward-order current instruction to produce instruction of d axle positive sequence voltage and the instruction of q axle positive sequence voltage;

This d axle positive sequence voltage instruction is become voltage command signal with q axle positive sequence voltage instruction transformation; And

To offer pulse-width modulator so that this pulse-width modulator produces control signal to voltage command signal.

16. Reactive Power Control method as claimed in claim 15 is characterized in that:

Judge whether detected q axle positive sequence voltage voltage takes place pass through situation;

When detecting q axle positive sequence voltage generation voltage and pass through situation, produce the instruction of the 2nd d axle forward-order current according to this detected q axle positive sequence voltage;

Instruction of the one d axle forward-order current and the 2nd d axle forward-order current instruction summation are instructed to produce the 3rd d axle forward-order current;

Judge whether detected d shaft voltage voltage takes place pass through situation;

When detected d axle positive sequence voltage generation voltage passes through situation, produce the instruction of the 2nd q axle forward-order current according to this detected d axle positive sequence voltage;

Instruction of the one q axle forward-order current and the 2nd q axle forward-order current instruction summation are instructed to produce the 3rd q axle forward-order current; And

Regulate instruction of the 3rd d axle forward-order current and the instruction of the 3rd q axle forward-order current to produce this d axle positive sequence voltage instruction and the instruction of this q axle positive sequence voltage.

17. Reactive Power Control method as claimed in claim 14 is characterized in that: the step of negative sequence component being carried out the Reactive Power Control of negative phase-sequence comprises:

Produce a d axle negative current instructions according to detected q axle negative sequence voltage;

Produce a q axle negative current instructions according to detected d axle negative sequence voltage;

Regulating a d axle negative current instructions instructs to produce instruction of d axle negative sequence voltage and q axle negative sequence voltage respectively with a q axle negative current instructions;

This d axle negative sequence voltage instruction and the instruction of this q axle negative sequence voltage are rotated into corresponding positive sequence component;

Instruction map becomes voltage command signal with q axle negative sequence voltage in the d of positive sequence axle negative sequence voltage instruction with postrotational; And

This voltage command signal is offered pulse-width modulator so that this pulse-width modulator produces control signal.

18. Reactive Power Control method as claimed in claim 17 is characterized in that: this Reactive Power Control method also comprises:

Whether the difference between feedback negative phase-sequence reactive power of judging calculating and getting and the instruction of given negative phase-sequence reactive power is zero;

In calculating and feedback negative phase-sequence reactive power and the difference between the instruction of given negative phase-sequence reactive power when non-vanishing, feedback negative phase-sequence reactive power that get according to this calculating and given negative phase-sequence reactive power instruction generation the 2nd q axle negative current instructions; And

The one q axle negative current instructions and the 2nd q axle negative current instructions are sued for peace to produce the 3rd q axle negative current instructions; And

Regulate the 3rd q axle negative current instructions to produce this q axle negative sequence voltage instruction.

19. a power reactive power control system is characterized in that: this power reactive power control system comprises:

Electric energy transducer; This electric energy transducer comprises generator side converter and grid side converter; This generator side converter and TRT electrically connect to be used for that the alternating current that this generator produces is transformed into direct current, and this grid side converter is connected with electrical network to be used for converting this direct current to alternating current; And

Controller; This controller controllably connects this grid side converter; This controller is used to detect the alternating current that between this grid side converter and electrical network, transmits; This controller also is used for isolating the first sequence component and the second sequence component from detected alternating current; This controller also is used for this first sequence component is carried out first Reactive Power Control to produce first command signal and this second sequence component is carried out second Reactive Power Control to produce second command signal, and this controller also is used to respond this first command signal and this second command signal transmission control signal gives this grid side converter so that this grid side converter is adjusted in the reactive power of the alternating current that transmits between this grid side converter and this electrical network.

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