CN111193273B

CN111193273B - Phase modulator control method, phase modulator control device, phase modulator system and storage medium

Info

Publication number: CN111193273B
Application number: CN202010290626.6A
Authority: CN
Inventors: 孙华东; 李文锋; 许涛; 郭剑波; 张健; 李志强; 郭强; 赵兵; 贺静波; 贾媛; 魏巍; 李莹; 王官宏; 陶向宇
Original assignee: China Electric Power Research Institute Co Ltd CEPRI
Current assignee: China Electric Power Research Institute Co Ltd CEPRI
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2020-07-17
Anticipated expiration: 2040-04-14
Also published as: CN111193273A

Abstract

Phase modulator control method, device and methodA phase modulator system, the method comprising: obtaining DC side voltage of current transformer in phase modulator systemE _dcAnd AC side reactive powerQ _g(ii) a Judging the DC side voltage of a converterE _dcWhether within the voltage dead band: if not, obtaining a d-axis current reference value of the converter through calculation and amplitude limiting; if so, taking the previous value of the current transformer d-axis current reference value as the current transformer d-axis current reference value; according to the reactive power of the AC side of the converterQ _gAnd calculating to obtain a preliminary value of a q-axis current reference value of the converterI _gqref1(ii) a Preliminary value of converter q-axis current reference valueI _gqref1Amplitude limiting is carried out to obtain the final value of the q-axis current reference value of the converterI _gqref2(ii) a Outputting final values of converter d-axis current reference value and converter q-axis current reference valueI _gqref2Final value of converter d-axis current reference and converter q-axis current referenceI _gqref2For effecting control of the camcorder. According to the embodiment of the invention, voltage, inertia and frequency adjustment are realized.

Description

Phase modulator control method, phase modulator control device, phase modulator system and storage medium

Technical Field

The invention relates to the field of phase modulators, in particular to a phase modulator control method, a phase modulator control device, a phase modulator system and a storage medium.

Background

The phase modulator, as a reactive power compensation device, can automatically increase reactive output when the voltage of the power grid is reduced and absorb reactive power when the voltage of the power grid is increased according to the needs of the system so as to maintain the voltage, improve the stability of the power system and improve the power supply quality of the system, thus being widely applied to the extra-high voltage direct current converter station.

The existing phase modulators all adopt synchronous motors, and the problems that the inertia support is uncontrollable and the phase modulators cannot participate in primary frequency modulation of a system in the operation process of the phase modulators are solved, so that the problems of inertia and frequency adjustment of a power grid system cannot be solved under a plurality of application scenes, particularly application scenes (such as new energy stations) with complex power grid operation characteristics, and power accidents are frequent.

Disclosure of Invention

In view of this, the invention provides a phase modulator control method, a phase modulator control device, a phase modulator system and a storage medium, and aims to solve the problems of insufficient voltage, inertia, frequency adjustment and short-circuit current in a power system at the same time.

In a first aspect, an embodiment of the present invention provides a phase modulation machine control method, including:

obtaining preliminary values of reactive power reference values of a phase modulatorQ _ref1；

Preliminary values for the phase modifier reactive power reference valueQ _ref1Amplitude limiting processing is carried out to obtain the final value of the reactive power reference value of the phase modulatorQ _ref2；

Acquiring the power grid frequency and judging whether the power grid frequency is in a frequency dead zone, if not, calculating to obtain a preliminary value of the active power reference value of the phase modulator according to the power grid frequencyP _ref1；

Preliminary value of active power reference value of the phase modulatorP _ref1Amplitude limiting processing is carried out to obtain the final value of the active power reference value of the phase modulatorP _ref2；

Outputting the final value of the reference value of the reactive power of the phase modulatorQ _ref2And a final value of the phase modulator active power reference valueP _ref2Final value of the reference value of reactive power of the phase modulatorQ _ref2And a final value of the phase modulator active power reference valueP _ref2For effecting control of the camcorder.

Further, the power grid frequency is obtained and whether the power grid frequency is in a frequency dead zone is judged, if not, a preliminary value of an active power reference value of the phase modulator is obtained through calculation according to the power grid frequencyP _ref1The method also comprises the following steps: obtaining a first frequency of a power gridf ₁(ii) a Judging the first frequency of the power gridf ₁Whether within a first frequency dead band; delaying a first time period by a first predetermined amount of time if not within the first frequency dead band; obtaining a second frequency of the gridf ₂(ii) a Judging the second frequency of the power gridf ₂Whether it is within a second frequency dead band; if not within the second frequency dead zone, then according to the second frequency of the power gridf ₂Calculating to obtain the initial value of the reference value of the active power of the phase modulatorP _ref1。

Further, the preliminary value of the phase modulator active power reference valueP _ref1Before the clipping process is performed, the method further comprises the following steps: according to the phase modulation machineFinal value of reactive power reference valueQ _ref2Respectively calculating to obtain the initial value of the upper limit value of the active power reference value of the phase modulatorP _refmax1And the preliminary value of the lower limit value of the active power reference value of the phase modulatorP _refmin1。

Further, the preliminary values of the upper limit value of the active power reference value of the phase modulator are obtained through respective calculationP _refmax1And the preliminary value of the lower limit value of the active power reference value of the phase modulatorP _refmin1Then, the method further comprises the following steps: according to the rotational speed of the phase-modifying machineΩFor the preliminary value of the upper limit value of the active power reference value of the phase modulatorP _refmax1And the preliminary value of the lower limit value of the active power reference value of the phase modulatorP _refmin1Respectively adjusting to obtain final value of upper limit value of active power reference value of phase modulatorP _refmax2And the final value of the lower limit value of the active power reference value of the phase modulatorP _refmin2。

Further, the rotating speed according to the phase modifierΩFor the preliminary value of the upper limit value of the active power reference value of the phase modulatorP _refmax1And the preliminary value of the lower limit value of the active power reference value of the phase modulatorP _refmin1Respectively adjusting to obtain final value of upper limit value of active power reference value of phase modulatorP _refmax2And the final value of the lower limit value of the active power reference value of the phase modulatorP _refmin2The method comprises the following steps: if it is notΩ _min≤Ω≤Ω _maxThe final value of the upper limit value of the active power reference value of the phase modulatorP _refmax2=P _refmax1Final value of lower limit value of active power reference value of phase modulatorP _refmin2=P _refmin1(ii) a If it is notΩ＞Ω _maxThe final value of the upper limit value of the active power reference value of the phase modulatorP _refmax2= 0; if it is notΩ＜Ω _minThe final value of the lower limit value of the active power reference value of the phase modulatorP _refmin2=0, wherein,Ω _maxis an upper limit value of the rotational speed of the phase modifier,Ω _minthe lower limit value of the rotating speed of the phase modifier.

Further, the preliminary value of the phase modulator active power reference valueP _ref1Amplitude limiting processing is carried out to obtain the final value of the active power reference value of the phase modulatorP _ref2The method comprises the following steps: if it is notP _refmin2≤P _ref1≤P _refmax2The final value of the reference value of the active power of the phase modulatorP _ref2=P _ref1(ii) a If it is notP _ref1＞P _refmax2The final value of the reference value of the active power of the phase modulatorP _ref2=P _refmax2(ii) a If it is notP _ref1 ＜P _refmin2The final value of the reference value of the active power of the phase modulatorP _ref2=P _refmin2。

Further, the preliminary value of the reference value of reactive power of the phase modulatorQ _ref1Amplitude limiting processing is carried out to obtain the final value of the reactive power reference value of the phase modulatorQ _ref2The method comprises the following steps: if it is notQ _min≤Q _ref1≤Q _maxThe final value of the reference value of the reactive power of the phase modulatorQ _ref2=Q _ref1(ii) a If it is notQ _ref1＞Q _maxThe final value of the reference value of the reactive power of the phase modulatorQ _ref2=Q _max(ii) a If it is notQ _ref1 ＜Q _minThe final value of the reference value of the reactive power of the phase modulatorQ _ref2=Q _min(ii) a Wherein the content of the first and second substances,Q _maxis the upper limit value of the reactive power reference value of the phase modulator,Q _minthe lower limit value of the reactive power reference value of the phase modulator.

Further, the preliminary value of the reference value of the reactive power of the phase modulator is obtainedQ _ref1Before, also include: obtaining grid voltageV _tAnd the current of the power gridI _t(ii) a According to the network voltageV _tAnd the network currentI _tCalculating to obtain the initial value of the reference value of the reactive power of the phase modulatorQ _ref1。

In a second aspect, an embodiment of the present invention further provides a phase modulation machine control apparatus, including:

a data acquisition unit for acquiring preliminary value of reference value of reactive power of phase modulatorQ _ref1；

A first clipping unit for clipping the preliminary value of the reference value of reactive power of the phase modulatorQ _ref1Amplitude limiting processing is carried out to obtain the final value of the reactive power reference value of the phase modulatorQ _ref2；

The judgment unit is used for acquiring the power grid frequency and judging whether the power grid frequency is in a frequency dead zone, if not, calculating to obtain a preliminary value of the active power reference value of the phase modulator according to the power grid frequencyP _ref1；

A second clipping unit for clipping the preliminary value of the phase modulator active power reference valueP _ref1Amplitude limiting processing is carried out to obtain the final value of the active power reference value of the phase modulatorP _ref2；

An output unit for outputting the final value of the reference value of the reactive power of the phase modulatorQ _ref2And a final value of the phase modulator active power reference valueP _ref2Final value of the reference value of reactive power of the phase modulatorQ _ref2And a final value of the phase modulator active power reference valueP _ref2For effecting control of the camcorder.

Further, the judging unit is further configured to: obtaining a first frequency of a power gridf ₁(ii) a Judging the first frequency of the power gridf ₁Whether within a first frequency dead band; if not within the first frequency dead zoneDelaying the first time period by a first predetermined amount of time; obtaining a second frequency of the gridf ₂(ii) a Judging the second frequency of the power gridf ₂Whether it is within a second frequency dead band; if not within the second frequency dead zone, then according to the second frequency of the power gridf ₂Calculating to obtain the initial value of the reference value of the active power of the phase modulatorP _ref1。

Further, the judging unit is further configured to: according to the final value of the reference value of the reactive power of the phase modulatorQ _ref2Respectively calculating to obtain the initial value of the upper limit value of the active power reference value of the phase modulatorP _refmax1And the preliminary value of the lower limit value of the active power reference value of the phase modulatorP _refmin1。

Further, the judging unit is further configured to: according to the rotational speed of the phase-modifying machineΩFor the preliminary value of the upper limit value of the active power reference value of the phase modulatorP _refmax1And the preliminary value of the lower limit value of the active power reference value of the phase modulatorP _refmin1Respectively adjusting to obtain final value of upper limit value of active power reference value of phase modulatorP _refmax2And the final value of the lower limit value of the active power reference value of the phase modulatorP _refmin2。

Further, the rotating speed according to the phase modifierΩFor the preliminary value of the upper limit value of the active power reference value of the phase modulatorP _refmax1And the preliminary value of the lower limit value of the active power reference value of the phase modulatorP _refmin1Respectively adjusting to obtain final value of upper limit value of active power reference value of phase modulatorP _refmax2And the final value of the lower limit value of the active power reference value of the phase modulatorP _refmin2The method comprises the following steps: if it is notΩ _min≤Ω≤Ω _maxThe final value of the upper limit value of the active power reference value of the phase modulatorP _refmax2=P _refmax1Final value of lower limit value of active power reference value of phase modulatorP _refmin2=P _refmin1(ii) a If it is notΩ＞Ω _maxThe final value of the upper limit value of the active power reference value of the phase modulatorP _refmax2= 0; if it is notΩ＜Ω _minThe final value of the lower limit value of the active power reference value of the phase modulatorP _refmin2= 0; wherein the content of the first and second substances,Ω _maxis an upper limit value of the rotational speed of the phase modifier,Ω _minthe lower limit value of the rotating speed of the phase modifier.

Further, the data acquisition unit is further configured to: obtaining grid voltageV _tAnd the current of the power gridI _t(ii) a According to the network voltageV _tAnd the network currentI _tCalculating to obtain the initial value of the reference value of the reactive power of the phase modulatorQ _ref1。

In a third aspect, an embodiment of the present invention further provides another phase modulation machine control method, including:

obtaining DC side voltage of current transformer in phase modulator systemE _dcAnd AC side reactive powerQ _g；

Judging the DC side voltage of the converterE _dcWhether within the voltage dead band:

if not, obtaining a d-axis current reference value of the converter through calculation and amplitude limiting;

if so, taking the previous value of the current transformer d-axis current reference value as the current transformer d-axis current reference value;

according to the reactive power of the AC side of the converterQ _gAnd calculating to obtain a preliminary value of a q-axis current reference value of the converterI _gqref1；

Preliminary value of the converter q-axis current reference valueI _gqref1Amplitude limiting is carried out to obtain the final value of the q-axis current reference value of the converterI _gqref2；

Outputting the final values of the d-axis current reference value and the q-axis current reference value of the converterI _gqref2Final values of said converter d-axis current reference and said converter q-axis current referenceI _gqref2For effecting control of the camcorder.

Further, the reference value of the converter q-axis currentPreliminary valueI _gqref1Amplitude limiting is carried out to obtain the final value of the q-axis current reference value of the converterI _gqref2The method comprises the following steps: if it is notI _gqmin≤I _gqref1≤I _gqmaxThe final value of the converter q-axis current reference valueI _gqref2=I _gqref1(ii) a If it is notI _gqref1＞I _gqmaxThe final value of the converter q-axis current reference valueI _gqref2=I _gqmax(ii) a If it is notI _gqref1 ＜I _gqminThe final value of the converter q-axis current reference valueI _gqref2=I _gqmin(ii) a Wherein the content of the first and second substances,I _gqmaxis the upper limit value of the converter q-axis current reference value,I _gqminthe lower limit value of the converter q-axis current reference value.

Further, the preliminary value of the converter q-axis current reference valueI _gqref1Before the clipping is carried out, the method comprises the following steps: respectively calculating to obtain the upper limit value of the converter q-axis current reference value according to the converter d-axis current reference valueI _gqmaxAnd lower limit valueI _gqmin。

Further, the obtaining of the converter d-axis current reference value through calculation and amplitude limiting includes: according to the DC side voltage of the converterE _dcObtaining a preliminary value of a d-axis current reference value of the current transformer through calculationI _gdref1(ii) a Preliminary value of d-axis current reference value of current transformerI _gdref1Carrying out amplitude limiting processing to obtain the final value of the d-axis current reference value of the converterI _gdref2。

Further, the preliminary value of the d-axis current reference value of the current transformerI _gdref1Carrying out amplitude limiting processing to obtain the final value of the d-axis current reference value of the converterI _gdref2The method comprises the following steps: if it is notI _gdmin≤I _gdref1≤I _gdmaxThe final value of the d-axis current reference value of the converterI _gdref2=I _gdref1(ii) a If it is notI _gdref1＞I _gdmaxThe final value of the d-axis current reference value of the converterI _gdref2=I _gdmax(ii) a If it is notI _gdref1 ＜I _gdminThe final value of the d-axis current reference value of the converterI _gdref2=I _gdmin(ii) a Wherein the content of the first and second substances,I _gdmaxis the upper limit value of the d-axis current reference value of the current transformer,I _gdminthe lower limit value of the d-axis current reference value of the converter.

In a fourth aspect, an embodiment of the present invention further provides another phase modulation control apparatus, including:

a data acquisition unit for acquiring DC side voltage of a current transformer in a phase modulator systemE _dcAnd AC side reactive powerQ _g；

A judging unit for judging the DC side voltage of the converterE _dcWhether within the voltage dead band: if not, obtaining a d-axis current reference value of the converter through calculation and amplitude limiting; if so, taking the previous value of the current transformer d-axis current reference value as the current transformer d-axis current reference value;

a calculating unit for calculating the AC side reactive power of the converterQ _gAnd calculating to obtain a preliminary value of a q-axis current reference value of the converterI _gqref1；

A limiting unit for limiting the preliminary value of the converter q-axis current reference valueI _gqref1Amplitude limiting is carried out to obtain the final value of the q-axis current reference value of the converterI _gqref2；

An output unit for outputting the final values of the converter d-axis current reference value and the converter q-axis current reference valueI _gqref2Final values of said converter d-axis current reference and said converter q-axis current referenceI _gqref2For effecting control of the camcorder.

Further, the preliminary value of the converter q-axis current reference valueI _gqref1Amplitude limiting is carried out to obtain the final value of the q-axis current reference value of the converterI _gqref2The method comprises the following steps: if it is notI _gqmin≤I _gqref1≤I _gqmaxThe final value of the converter q-axis current reference valueI _gqref2=I _gqref1(ii) a If it is notI _gqref1＞I _gqmaxThe final value of the converter q-axis current reference valueI _gqref2=I _gqmax(ii) a If it is notI _gqref1 ＜I _gqminThe final value of the converter q-axis current reference valueI _gqref2=I _gqmin(ii) a Wherein the content of the first and second substances,I _gqmaxis the upper limit value of the converter q-axis current reference value,I _gqminthe lower limit value of the converter q-axis current reference value.

Further, the computing unit is further configured to: respectively calculating to obtain the upper limit value of the converter q-axis current reference value according to the converter d-axis current reference valueI _gqmaxAnd lower limit valueI _gqmin。

Further, the judging unit is further configured to: according to the DC side voltage of the converterE _dcObtaining a preliminary value of a d-axis current reference value of the current transformer through calculationI _gdref1(ii) a Preliminary value of d-axis current reference value of current transformerI _gdref1Carrying out amplitude limiting processing to obtain the final value of the d-axis current reference value of the converterI _gdref2。

In a fifth aspect, an embodiment of the present invention further provides a phase modulation system, including:

the acquisition device is used for acquiring power data and sending the power data to the control device, and the power data comprises at least one of the following items: the method comprises the following steps of (1) power grid frequency, power grid voltage, the rotating speed of a phase modulator, the direct current side voltage of a converter in the phase modulator system and the alternating current side reactive power of the converter in the phase modulator system;

a control device for acquiring the power data and outputting a control signal according to the method of the embodiments, wherein the control signal comprises at least one of the following: the final value of the reactive power reference value of the phase modulator, the final value of the active power reference value of the phase modulator, the d-axis current reference value of the converter and the q-axis current reference value of the converter;

the frequency converter is used for receiving the control signal and controlling the asynchronous motor to operate according to the control signal;

the asynchronous motor is used for adjusting the abnormity of the power grid under the control of the frequency converter;

the acquisition device is respectively connected with the power grid, the asynchronous motor and the control device, the control device is connected with the frequency converter, and the frequency converter is connected with the asynchronous motor.

Further, the frequency converter includes: a machine side converter and a grid side converter; the machine side converter is connected with the asynchronous motor and the grid side converter, and the grid side converter is connected with a power grid.

Further, the machine side converter and the grid side converter are all fully-controlled converters.

In a sixth aspect, an embodiment of the present invention further provides a computer storage medium, on which a computer program is stored, where the computer program is used to implement:

In a seventh aspect, an embodiment of the present invention further provides another computer storage medium, on which a computer program is stored, where the computer program is used to implement:

According to the phase modulator control method, the phase modulator control device, the phase modulator system and the storage medium, the phase modulator adopts a fixed active power and fixed reactive power control mode and/or a fixed direct current voltage control and fixed reactive power control mode, so that the problems that in the prior art, the phase modulator cannot simultaneously solve the short-circuit current deficiency and the voltage, inertia and frequency adjustment in an application scene (such as a new energy station) with complex power grid operation characteristics are solved. The phase modulator control method, the phase modulator control device and the phase modulator provided by the embodiment of the invention can provide quick and correct reactive response in a voltage sudden change transient process on the premise of realizing steady-state voltage regulation of a power grid system, and have a regulating effect on inertia and primary frequency modulation of the power grid system, thereby greatly improving the stability of the power grid system.

Drawings

Fig. 1 shows an exemplary flow chart of a phase modulator control method according to an embodiment of the present invention;

FIG. 2 is an exemplary flow chart of a preferred embodiment of the method shown in FIG. 1;

fig. 3 is a schematic structural view showing a phase modulator control apparatus according to an embodiment of the present invention;

FIG. 4 shows an exemplary flow chart of another method of phase modulator control according to an embodiment of the invention;

FIG. 5 is an exemplary flow chart of a preferred embodiment of the method shown in FIG. 4;

fig. 6 is a schematic structural view showing another phase modulator control apparatus according to an embodiment of the present invention;

fig. 7 shows a schematic structural diagram of a phase modulator according to an embodiment of the present invention.

Detailed Description

The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.

Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.

Fig. 1 shows an exemplary flowchart of a phase modulation machine control method according to an embodiment of the present invention.

As shown in fig. 1, the method includes:

step S101: obtaining preliminary values of reactive power reference values of a phase modulatorQ _ref1；

Step S102: preliminary value of the reference value of the reactive power of the cameraQ _ref1Amplitude limiting processing is carried out to obtain the final value of the reactive power reference value of the phase modulatorQ _ref2；

Step S103: acquiring the power grid frequency and judging whether the power grid frequency is in a frequency dead zone, if not, calculating to obtain a preliminary value of the phase modulator active power reference value according to the power grid frequencyP _ref1；

Step S104: preliminary value of active power reference value of cameraP _ref1Amplitude limiting processing is carried out to obtain the final value of the active power reference value of the phase modulatorP _ref2；

Step S105: outputting final value of reactive power reference value of phase modulatorQ _ref2And final value of active power reference value of phase modulatorP _ref2Final value of reactive power reference value of phase modulatorQ _ref2And final value of active power reference value of phase modulatorP _ref2For effecting control of the camcorder.

In the embodiment of the invention, the steps S101-S102 are carried out through the preliminary value of the reference value of the reactive power of the cameraQ _ref1And amplitude limiting can be realized, and the voltage of the power grid system can be regulated. Step S103 may be implemented by calculating the grid frequencyfWith grid frequency referencef _refDifference of (2)ΔfJudgment ofΔfWhether the frequency is within the frequency dead zone or not is judged, namely whether the frequency modulation process is started or not is judged: if the frequency is within the frequency dead zone, namely the power grid frequency fluctuation belongs to a normal range, the subsequent frequency modulation process is not needed, the control process can be ended, and the next control process is started; if the frequency is not within the frequency dead zone, namely the frequency fluctuation is abnormal, the subsequent frequency modulation process is required. The frequency dead zone range is a deviation range between the grid frequency and a grid frequency reference value, for example, the grid frequency reference value is 50.00 Hz, the frequency dead zone is ± 0.05 Hz, the grid frequency is within the frequency dead zone in the range of 49.95-50.05 Hz, otherwise, the grid frequency is not within the frequency dead zone. Steps S103-S105 are carried out through frequency judgment and preliminary value of active power reference value of phase modulatorP _ref1The amplitude limiting can realize the adjustment of the inertia and the frequency of the power grid system.

In the above embodiment, the phase modulator is controlled by the fixed reactive power and the fixed active power, so that the problems of insufficient short-circuit current and voltage, inertia and frequency adjustment in an application scene (such as a new energy station) with complex operation characteristics of a power grid of the phase modulator in the prior art can not be solved at the same time. The phase modulator control method provided by the embodiment of the invention can provide quick and correct reactive response in the transient process of voltage mutation on the premise of realizing steady-state voltage regulation of a power grid system, and has a regulating effect on inertia and primary frequency modulation of the power grid system, thereby greatly improving the stability of the power grid system.

FIG. 2 is an exemplary flow chart of a preferred embodiment of the method shown in FIG. 1.

As shown in fig. 2, in a preferred embodiment, step S103 further includes:

step S204: obtaining a first frequency of a power gridf ₁；

Step S205: judging the first frequency of the power gridf ₁Whether within a first frequency dead band;

step S206: delaying the first time period by a first predetermined amount of time if not within the first frequency dead band;

step S207: obtaining a second frequency of the gridf ₂；

Step S208: judging the second frequency of the power gridf ₂Whether it is within a second frequency dead band;

step S209: if not, according to the second frequency of the power gridf ₂Calculating to obtain the initial value of the reference value of the active power of the phase modulatorP _ref1。

In the embodiment of the present invention, step S205 and step S208 both determine whether the grid frequency is within the frequency dead zone, that is, determine whether to enter the frequency modulation process: if the frequency is within the frequency dead zone, namely the power grid frequency fluctuation belongs to a normal range, the subsequent frequency modulation process is not needed, the control process can be ended, and the next control process is started; if the frequency is not within the frequency dead zone, namely the frequency fluctuation is abnormal, the subsequent frequency modulation process is required. First frequency of the power gridf ₁And a second frequency of the gridf ₂The grid frequencies at two different times. The first frequency dead band and the second frequency dead band may be the same or different. The first predetermined amount of time may be any value in the range of 0.1-10 s, preferably 0.2 s.

In the above embodiment, the first frequency is determined by the frequency of the power gridf ₁The dead zone is judged and then delayed, so that the phase modulator can release the inertia of the phase modulator, and inertia adjustment is realized.

In a preferred embodiment, the preliminary value of the phase modulator active power reference value in step S209P _ref1Can be calculated by the following formula (1):

（1）；

wherein the content of the first and second substances,K _pin order to control the droop control coefficient,f ₂for the second frequency of the power grid,f _refis the grid frequency reference value.

In a preferred embodiment, before step S212, the method further includes:

step S210: according to the final value of the reactive power reference value of the phase modulatorQ _ref2Respectively calculating to obtain the initial value of the upper limit value of the active power reference value of the phase modulatorP _refmax1And the preliminary value of the lower limit value of the active power reference value of the phase modulatorP _refmin1。

In the embodiment of the present invention, the sequence of step S210 and step S209 may be interchanged, or may be executed simultaneously.

In a preferred embodiment, the preliminary value of the upper limit value of the active power reference value of the phase modulatorP _refmax1Can be calculated by the following formula (2):

（2）；

wherein the content of the first and second substances,S _maxfor the maximum capacity limit of the frequency converter in the phase modifier,Q _ref2the final value of the reactive power reference value of the phase modulator;

preliminary value of active power reference value lower limit value of phase modulatorP _refmin1Can be calculated by the following formula (3):

（3）；

wherein the content of the first and second substances,S _maxfor the maximum capacity limit of the frequency converter in the phase modifier,Q _ref2is the final value of the reactive power reference value of the phase modulator.

In a preferred embodiment, after step S210, the method further includes:

step S211: according to the rotational speed of the phase-modifying machineΩPreliminary value of upper limit value of active power reference value of the cameraP _refmax1And the preliminary value of the lower limit value of the active power reference value of the phase modulatorP _refmin1Respectively adjusting to obtain final value of upper limit value of active power reference value of phase modulatorP _refmax2And the final value of the lower limit value of the active power reference value of the phase modulatorP _refmin2。

In the above embodiment, the over-speed or under-speed of the phase modulator can be prevented by limiting the rotation speed of the phase modulator, so that the protection of the converter in the phase modulator can be realized, and the system stability is improved.

In a preferred embodiment, step S211 includes:

if it is notΩ _min≤Ω≤Ω _maxThe final value of the upper limit value of the active power reference value of the phase modulatorP _refmax2=P _refmax1Final value of lower limit value of active power reference value of phase modulatorP _refmin2=P _refmin1；

If it is notΩ＞Ω _maxThe final value of the upper limit value of the active power reference value of the phase modulatorP _refmax2=0；

If it is notΩ＜Ω _minThe final value of the lower limit value of the active power reference value of the phase modulatorP _refmin2=0；

Wherein the content of the first and second substances,Ω _maxis an upper limit value of the rotational speed of the phase modifier,Ω _minthe lower limit value of the rotating speed of the phase modifier.

In a preferred embodiment, step S212 includes:

if it is notP _refmin2≤P _ref1≤P _refmax2The final value of the reference value of the active power of the phase modulatorP _ref2=P _ref1；

If it is notP _ref1＞P _refmax2The final value of the reference value of the active power of the phase modulatorP _ref2=P _refmax2；

If it is notP _ref1 ＜P _refmin2The final value of the reference value of the active power of the phase modulatorP _ref2=P _refmin2。

In the above embodiment, the active power of the camera is limited, so that the frequency in the power grid system can be adjusted, and the stability of the power grid system is improved.

In a preferred embodiment, step S203 includes:

if it is notQ _min≤Q _ref1≤Q _maxThe final value of the reference value of the reactive power of the phase modulatorQ _ref2=Q _ref1；

If it is notQ _ref1＞Q _maxThe final value of the reference value of the reactive power of the phase modulatorQ _ref2=Q _max；

If it is notQ _ref1 ＜Q _minThe final value of the reference value of the reactive power of the phase modulatorQ _ref2=Q _min；

Wherein the content of the first and second substances,Q _maxis the upper limit value of the reactive power reference value of the phase modulator,Q _minthe lower limit value of the reactive power reference value of the phase modulator.

In the above embodiment, the upper limit value of the reactive power reference value of the phase modulatorQ _maxAnd lower limit valueQ _minAnd maximum capacity limit value of frequency converter in phase modulatorS _maxIn the context of a correlation, the correlation,Q _max=S _max，Q _min= -S _max. Through the restriction to the camera reactive power, can realize the regulation to voltage in the electric wire netting system to improve electric wire netting system's stability.

In a preferred embodiment, before step S203, the method further includes:

step S201: obtaining grid voltageV _tAnd the current of the power gridI _t；

Step S202: according to the voltage of the networkV _tAnd the current of the power gridI _tCalculating to obtain the initial value of the reference value of the reactive power of the phase modulatorQ _ref1。

In the embodiment of the present invention, the grid voltage in step S201V _tAnd the current of the power gridI _tAnd the first frequency of the power grid in the step S204f ₁Step S211 is the rotational speed of the phase modulatorΩThe second frequency of the power grid in step S207 can be obtained from the power data collected in the current collection stage at the same timef ₂May be obtained from the power data collected in the next collection phase.

In a preferred embodiment, the preliminary value of the reference value of the reactive power of the phase modulatorQ _ref1Calculated using the following equation (4):

（4）；

wherein the content of the first and second substances,Kis the direct current gain of the series correction element,K _ain order to amplify the gain of the link,sin order to be the laplacian operator,T ₁andT ₂respectively the time constant of the first serial calibration segment,T ₃andT ₄respectively, the second series calibration link time constant,T _ain order to amplify the time constant of the link,K _va factor is selected for the integral correction element,V _refis a reference value of the voltage of the power grid,V _tis the voltage of the power grid,I _tfor the purpose of the grid current,X _cin order to add a compensating reactance,φin order to add the angle of the compensation factor,T _ris the filtering element time constant.

Fig. 3 shows a schematic structural diagram of a phase modulator control apparatus according to an embodiment of the present invention. The apparatus shown in fig. 3 may correspondingly perform the method shown in fig. 1.

As shown in fig. 3, in this embodiment, the present invention further provides a phase modulation control apparatus, including:

a data obtaining unit 301 for obtaining a preliminary value of a reference value of reactive power of a phase modulatorQ _ref1；

A first clipping unit 302 for preliminary values of the reference value of the camera reactive powerQ _ref1Amplitude limiting processing is carried out to obtain the final value of the reactive power reference value of the phase modulatorQ _ref2；

A judging unit 303, configured to obtain a power grid frequency and judge whether the power grid frequency is within a frequency dead zone, and if not, calculate a preliminary value of an active power reference value of the phase modulator according to the power grid frequencyP _ref1；

A second clipping unit 304 for clipping the preliminary value of the phase modulator power reference valueP _ref1Amplitude limiting processing is carried out to obtain the final value of the active power reference value of the phase modulatorP _ref2；

The output unit (305) is provided with a display unit,for outputting final value of phase modulator to reactive power reference valueQ _ref2And final value of active power reference value of phase modulatorP _ref2Final value of reactive power reference value of phase modulatorQ _ref2And final value of active power reference value of phase modulatorP _ref2For effecting control of the camcorder.

In the embodiment of the present invention, the data obtaining unit 301 and the first clipping unit 302 are used for passing the preliminary value of the reference value of the camera reactive powerQ _ref1And amplitude limiting can be realized, and the voltage of the power grid system can be regulated. The determination unit 303 may be adapted to determine the grid frequency by calculating the grid frequencyfWith grid frequency referencef _refDifference of (2)ΔfJudgment ofΔfWhether the frequency is within the frequency dead zone or not is judged, namely whether the frequency modulation process is started or not is judged: if the frequency is within the frequency dead zone, namely the power grid frequency fluctuation belongs to a normal range, the subsequent frequency modulation process is not needed, the control process can be ended, and the next control process is started; if the frequency is not within the frequency dead zone, namely the frequency fluctuation is abnormal, the subsequent frequency modulation process is required. The frequency dead zone range is a deviation range between the grid frequency and a grid frequency reference value, for example, the grid frequency reference value is 50.00 Hz, the frequency dead zone is ± 0.05 Hz, the grid frequency is within the frequency dead zone in the range of 49.95-50.05 Hz, otherwise, the grid frequency is not within the frequency dead zone. The judgment unit 303, the second amplitude limiting unit 304 and the output unit 305 judge and output the initial value of the active power reference value of the phase modulator through the frequencyP _ref1The amplitude limiting can realize the adjustment of the inertia and the frequency of the power grid system.

In a preferred embodiment, the determining unit 303 is further configured to:

obtaining a first frequency of a power gridf ₁；

Judging the first frequency of the power gridf ₁Whether within a first frequency dead band;

delaying the first time period by a first predetermined amount of time if not within the first frequency dead band;

obtaining a second frequency of the gridf ₂；

Judging the second frequency of the power gridf ₂Whether it is within a second frequency dead band;

if not, according to the second frequency of the power gridf ₂Calculating to obtain the initial value of the reference value of the active power of the phase modulatorP _ref1。

In the embodiment of the invention, the first frequencies are respectively matchedf ₁And a second frequency of the gridf ₂Whether the frequency modulation process is started or not is judged, namely whether the frequency modulation process is started or not is judged: if the frequency is within the frequency dead zone, namely the power grid frequency fluctuation belongs to a normal range, the subsequent frequency modulation process is not needed, the control process can be ended, and the next control process is started; if the frequency is not within the frequency dead zone, namely the frequency fluctuation is abnormal, the subsequent frequency modulation process is required. First frequency of the power gridf ₁And a second frequency of the gridf ₂The grid frequencies at two different times. The first frequency dead band and the second frequency dead band may be the same or different. The first predetermined amount of time may be any value in the range of 0.1-10 s, preferably 0.2 s.

In a preferred embodiment, the preliminary value of the phase modulator active power reference valueP _ref1Can be calculated by the following formula (1):

（1）；

In a preferred embodiment, the determining unit 303 is further configured to:

according to the final value of the reactive power reference value of the phase modulatorQ _ref2Respectively calculating to obtain the initial value of the upper limit value of the active power reference value of the phase modulatorP _refmax1And the preliminary value of the lower limit value of the active power reference value of the phase modulatorP _refmin1。

（2）；

（3）；

In a preferred embodiment, the determining unit 303 is further configured to:

according to the rotational speed of the phase-modifying machineΩPreliminary value of upper limit value of active power reference value of the cameraP _refmax1And the preliminary value of the lower limit value of the active power reference value of the phase modulatorP _refmin1Respectively adjusting to obtain final value of upper limit value of active power reference value of phase modulatorP _refmax2And the final value of the lower limit value of the active power reference value of the phase modulatorP _refmin2。

In a preferred embodiment, the speed of rotation is dependent on the phase modifierΩFor the preliminary value of the upper limit value of the active power reference value of the phase modulatorP _refmax1And the preliminary value of the lower limit value of the active power reference value of the phase modulatorP _refmin1Respectively adjusting to obtain final value of upper limit value of active power reference value of phase modulatorP _refmax2And the final value of the lower limit value of the active power reference value of the phase modulatorP _refmin2The method comprises the following steps:

Wherein the content of the first and second substances,Ω _maxis an upper limit value of the rotational speed of the phase modifier,Ω _minas a lower limit value of the rotational speed of the phase modifier。

In a preferred embodiment, the preliminary value of the phase modulator active power reference value is setP _ref1Amplitude limiting processing is carried out to obtain the final value of the active power reference value of the phase modulatorP _ref2The method comprises the following steps:

In a preferred embodiment, preliminary values for the reference value of reactive power of the phase modulatorQ _ref1Amplitude limiting processing is carried out to obtain the final value of the reactive power reference value of the phase modulatorQ _ref2The method comprises the following steps:

In a preferred embodiment, the data obtaining unit 301 is further configured to:

obtaining grid voltageV _tAnd the current of the power gridI _t；

According to the voltage of the networkV _tAnd the current of the power gridI _tCalculating to obtain the initial value of the reference value of the reactive power of the phase modulatorQ _ref1。

In an embodiment of the invention, the grid voltageV _tGrid currentI _tFirst frequency of the power gridf ₁Rotating speed of phase modifierΩCan simultaneously obtain the second frequency of the power grid from the electric power data acquired in the current acquisition stagef ₂May be obtained from the power data collected in the next collection phase.

（4）；

Fig. 4 shows an exemplary flow chart of another phase modulator control method according to an embodiment of the present invention.

As shown in fig. 4, the method includes:

step S401: obtaining DC side voltage of current transformer in phase modulator systemE _dcAnd AC side reactive powerQ _g；

Step S402: judging the DC side voltage of a converterE _dcWhether within the voltage dead band:

step S403: if not, obtaining a d-axis current reference value of the converter through calculation and amplitude limiting;

step S404: if so, taking the previous value of the current transformer d-axis current reference value as the current transformer d-axis current reference value;

step S405: according to the reactive power of the AC side of the converterQ _gAnd calculating to obtain a preliminary value of a q-axis current reference value of the converterI _gqref1；

Step S406: preliminary value of converter q-axis current reference valueI _gqref1Amplitude limiting is carried out to obtain the final value of the q-axis current reference value of the converterI _gqref2；

Step S407: outputting final values of converter d-axis current reference value and converter q-axis current reference valueI _gqref2Final value of converter d-axis current reference and converter q-axis current referenceI _gqref2For effecting control of the camcorder.

In the embodiment of the present invention, step S402 may be implemented by calculating the dc side voltage of the converterE _dcAnd a DC side voltage reference value of the converterE _dcrefDifference of (2)ΔE _dcJudgment ofΔE _dcWhether the voltage is in the voltage dead zone or not is judged, namely whether the constant direct current voltage control is carried out or not is judged: if the current transformer d-axis current reference value is within the voltage dead zone, namely the voltage fluctuation belongs to the normal range, the current transformer d-axis current reference value can be taken as the previous value of the current transformer d-axis current reference value, namely the current transformer d-axis current reference value obtained in the last control process, and further, if the current transformer d-axis current reference value is not taken as the previous value, namely the current transformer d-axis current reference value is within the voltage dead zone in the first control process, the current transformer d-axis current reference value is zero; if the current reference value is not in the voltage dead zone, namely the voltage fluctuation is abnormal, the current reference value of the d axis of the current transformer at the moment is calculated and limited, so that the current reference value is not beyond the current limit of the current transformer, and the protection of the current transformer is realized. Step S406 may implement the adjustment of the voltage of the power grid system by limiting the q-axis current reference value of the converter, and may also ensure that the current reference value does not exceed the current limit of the converter itself, thereby implementing the protection of the converter.

In the above embodiment, the problem that in an application scene (such as a new energy station) in which the operation characteristics of a power grid are complex, the phase modulator in the prior art cannot simultaneously solve the problems of insufficient short-circuit current and voltage regulation is solved by adopting the constant direct-current voltage control and the constant reactive power control for the phase modulator. The phase modulator control method provided by the embodiment of the invention can provide quick and correct reactive response in the transient process of voltage mutation on the premise of realizing steady-state voltage regulation of a power grid system, thereby greatly improving the stability of the power grid system.

In a preferred embodiment, step S406 includes:

if it is notI _gqmin≤I _gqref1≤I _gqmaxThe final value of the converter q-axis current reference valueI _gqref2=I _gqref1；

If it is notI _gqref1＞I _gqmaxThe final value of the converter q-axis current reference valueI _gqref2=I _gqmax；

If it is notI _gqref1 ＜I _gqminThe final value of the converter q-axis current reference valueI _gqref2=I _gqmin；

Wherein the content of the first and second substances,I _gqmaxis the upper limit value of the converter q-axis current reference value,I _gqminthe lower limit value of the converter q-axis current reference value.

Fig. 5 is an exemplary flow chart of a preferred embodiment of the method shown in fig. 4.

As shown in fig. 5, in a preferred embodiment, before step S508, the method includes:

step S507: respectively calculating to obtain the upper limit value of the converter q-axis current reference value according to the converter d-axis current reference valueI _gqmaxAnd lower limit valueI _gqmin。

In the embodiment of the present invention, the steps S506 and S507 may be performed in the same order or in the same order.

In a preferred embodiment, step S403 includes:

step S503: according to the DC side voltage of the converterE _dcObtaining a preliminary value of a d-axis current reference value of the current transformer through calculationI _gdref1；

Step S504: preliminary value for current transformer d-axis current reference valueI _gdref1Carrying out amplitude limiting processing to obtain the final value of the d-axis current reference value of the converterI _gdref2。

In a preferred embodiment, step S504 includes:

if it is notI _gdmin≤I _gdref1≤I _gdmaxThe final value of the d-axis current reference value of the converterI _gdref2=I _gdref1；

If it is notI _gdref1＞I _gdmaxThe final value of the d-axis current reference value of the converterI _gdref2=I _gdmax；

If it is notI _gdref1 ＜I _gdminThe final value of the d-axis current reference value of the converterI _gdref2=I _gdmin；

Wherein the content of the first and second substances,I _gdmaxis the upper limit value of the d-axis current reference value of the current transformer,I _gdminthe lower limit value of the d-axis current reference value of the converter.

In the embodiment of the invention, the upper limit value of the d-axis current reference value of the converterI _gdmaxAnd lower limit valueI _gdminIn relation to the maximum and minimum current limits of the frequency converter itself in the phase modifier,I _gdmax=I _gmax，I _gdmin= -I _gmax，I _gmaxthe maximum current limit value of the frequency converter in the phase modulator.

In a preferred embodiment, the preliminary value of the d-axis current reference value of the current transformerI _gdref1Calculated using the following equation (5):

（5）；

wherein the content of the first and second substances,E _dcreffor the grid-side converter dc-side voltage reference,E _dcis the dc side voltage of the grid side converter,K _pda proportional link constant is controlled for the direct current voltage of the grid-side converter,K _idthe integral element constant is controlled for the direct current voltage of the grid-side converter,sis the laplacian operator.

In one excellenceIn an optional embodiment, the preliminary value of the converter q-axis current reference valueI _gqref1Calculated using the following equation (6):

（6）；

wherein the content of the first and second substances,Q _greffor the ac side reactive power reference value of the grid side converter,Q _gis the reactive power of the AC side of the grid-side converter,K _gda proportional link constant is controlled for the reactive power at the AC side of the grid-side converter,K _igan integral link constant is controlled for the reactive power at the AC side of the grid-side converter,sis the laplacian operator.

In a preferred embodiment, the upper limit value of the q-axis current reference value of the converterI _gqmaxCalculated using the following equation (7):

（7）；

wherein the content of the first and second substances,I _gmaxfor the maximum current limit of the frequency converter in the phase modulator,I _gdref2the final value of the d-axis current reference value of the grid-side converter is obtained;

lower limit value of converter q-axis current reference valueI _gqminCalculated using the following equation (8):

（8）；

wherein the content of the first and second substances,I _gmaxfor the maximum current limit of the frequency converter in the phase modulator,I _gdref2is the final value of the d-axis current reference value of the grid-side converter.

Fig. 6 is a schematic structural diagram showing a phase modulator control apparatus according to an embodiment of the present invention. The apparatus shown in fig. 6 may correspondingly perform the method shown in fig. 4.

As shown in fig. 6, in this embodiment, the present invention further provides a phase modulation control apparatus, including:

a data obtaining unit 601 for obtaining a dc side voltage of a converter in a phase modulator systemE _dcAnd AC side reactive powerQ _g；

A determining unit 602 for determining the dc side voltage of the converterE _dcWhether within the voltage dead band: if not, obtaining a d-axis current reference value of the converter through calculation and amplitude limiting; if so, taking the previous value of the current transformer d-axis current reference value as the current transformer d-axis current reference value;

a calculating unit 603 for calculating the reactive power of the converter according to the AC sideQ _gAnd calculating to obtain a preliminary value of a q-axis current reference value of the converterI _gqref1；

A clipping unit 604 for preliminary values of the converter q-axis current referenceI _gqref1Amplitude limiting is carried out to obtain the final value of the q-axis current reference value of the converterI _gqref2；

An output unit 605 for outputting the final values of the converter d-axis current reference value and the converter q-axis current reference valueI _gqref2Final value of converter d-axis current reference and converter q-axis current referenceI _gqref2For effecting control of the camcorder.

In the embodiment of the present invention, the determining unit 602 may be configured to calculate the dc-side voltage of the converterE _dcAnd a DC side voltage reference value of the converterE _dcrefDifference of (2)ΔE _dcJudgment ofΔE _dcWhether the voltage is in the voltage dead zone or not is judged, namely whether the constant direct current voltage control is carried out or not is judged: if the current transformer d-axis current reference value is within the voltage dead zone, namely the voltage fluctuation is within the normal range, the current transformer d-axis current reference value can be taken as the previous value of the current transformer d-axis current reference value, namely the current transformer d-axis current reference value obtained in the last control process, and further, if the current transformer d-axis current reference value is not taken as the previous value, namely the current transformer d-axis current reference value is within the voltage dead zone in the first control process, the current transformer d-axis current reference value is taken as the current transformerThe d-axis current reference value of the converter is zero; if the current reference value is not in the voltage dead zone, namely the voltage fluctuation is abnormal, the current reference value of the d axis of the current transformer at the moment is calculated and limited, so that the current reference value is not beyond the current limit of the current transformer, and the protection of the current transformer is realized. The amplitude limiting unit 604 may be configured to limit the q-axis current reference value of the converter, so as to adjust the voltage of the power grid system, and in addition, it may be ensured that the current reference value does not exceed the current limit of the converter itself, so as to protect the converter.

In a preferred embodiment, the preliminary value of the converter q-axis current reference value is setI _gqref1Amplitude limiting is carried out to obtain the final value of the q-axis current reference value of the converterI _gqref2The method comprises the following steps:

Wherein the content of the first and second substances,I _gqmaxas q-axis current of the converterThe upper limit value of the reference value is,I _gqminthe lower limit value of the converter q-axis current reference value.

In a preferred embodiment, the computing unit 603 is further configured to:

respectively calculating to obtain the upper limit value of the converter q-axis current reference value according to the converter d-axis current reference valueI _gqmaxAnd lower limit valueI _gqmin。

In a preferred embodiment, the determining unit 602 is further configured to:

according to the DC side voltage of the converterE _dcObtaining a preliminary value of a d-axis current reference value of the current transformer through calculationI _gdref1；

Preliminary value for current transformer d-axis current reference valueI _gdref1Carrying out amplitude limiting processing to obtain the final value of the d-axis current reference value of the converterI _gdref2。

In a preferred embodiment, the preliminary value of the d-axis current reference value of the converterI _gdref1Carrying out amplitude limiting processing to obtain the final value of the d-axis current reference value of the converterI _gdref2The method comprises the following steps:

（5）；

In a preferred embodiment, the preliminary value of the converter q-axis current reference valueI _gqref1Calculated using the following equation (6):

（6）；

In a preferred embodiment, the converter q-axis current referenceUpper limit of the reference valueI _gqmaxCalculated using the following equation (7):

（7）；

（8）；

On the other hand, the embodiment of the invention also provides a phase modulator system.

Fig. 7 shows a schematic structural diagram of a phase modulator system according to an embodiment of the present invention. As shown in fig. 7, the phase modulation system includes:

the collecting device 701 collects power data and sends the power data to the control device 702, wherein the power data includes at least one of the following items: the method comprises the following steps of (1) power grid frequency, power grid voltage, the rotating speed of a phase modulator, the direct current side voltage of a converter in the phase modulator system and the alternating current side reactive power of the converter in the phase modulator system;

a control device 702, which acquires power data and outputs control signals according to the method of the above embodiments, wherein the control signals include at least one of the following: the final value of the reactive power reference value of the phase modulator, the final value of the active power reference value of the phase modulator, the d-axis current reference value of the converter and the q-axis current reference value of the converter;

a frequency converter 703 for receiving the control signal and controlling the asynchronous motor 704 to operate according to the control signal;

the asynchronous motor 704 is used for adjusting the power grid abnormity under the control of the frequency converter 703;

the acquisition device 701 is connected with a power grid, an asynchronous motor 704 and a control device 702 respectively, the control device 702 is connected with a frequency converter 703, and the frequency converter 703 is connected with the asynchronous motor 704.

In this embodiment, the collecting device 701 may be one collecting device for collecting all the power data, or may be two or more collecting devices for collecting the power data of different devices respectively. The frequency converter 703 may be any suitable frequency converter. The control device 702 may be a processor or other device having data processing capabilities; the method described in each of the above embodiments may be executed separately to control the operation of the frequency converter 703, or two or more methods described in each of the above embodiments may be executed simultaneously to control the operation of the frequency converter 703. Asynchronous machine 704 may be any suitable asynchronous machine, preferably a double-fed asynchronous machine.

In the embodiment, the asynchronous motor is adopted to replace a synchronous motor in the prior art, so that a brand-new phase modulator system is provided; further, the control device controls the operation of the frequency converter according to the methods described in the above embodiments, which solves the problem that in the prior art, the phase modulator cannot simultaneously solve the problems of insufficient short-circuit current and the adjustment of voltage, inertia and frequency in the application scenario (such as a new energy station) with complex operation characteristics of the power grid. The embodiment of the invention provides a phase modulator system, which can provide quick and correct reactive response in a voltage sudden change transient process on the premise of realizing steady-state voltage regulation of a power grid system, has a regulating effect on inertia and primary frequency modulation of the power grid system, and greatly improves the stability of the power grid system.

In a preferred embodiment, the frequency converter comprises: a machine side converter and a grid side converter; the machine side converter is connected with the asynchronous motor and the grid side converter, and the grid side converter is connected with the power grid.

In the embodiment of the present invention, the control device may control the operation of the machine-side converter in the frequency converter according to the method shown in fig. 1, and control the operation of the grid-side converter in the frequency converter according to the method shown in fig. 4.

In a preferred embodiment, the machine-side converter and the grid-side converter are all fully-controlled converters.

In the above embodiment, by adopting the fully-controlled converter, the active power and the reactive power can be respectively controlled, so that the control process of the phase modulator is more convenient and effective.

In another aspect, an embodiment of the present invention further provides a computer storage medium, on which a computer program is stored, where the computer program is used to implement:

Preliminary value of the reference value of the reactive power of the cameraQ _ref1Amplitude limiting processing is carried out to obtain the final value of the reactive power reference value of the phase modulatorQ _ref2；

Acquiring the power grid frequency and judging whether the power grid frequency is in a frequency dead zone, if not, calculating to obtain a preliminary value of the phase modulator active power reference value according to the power grid frequencyP _ref1；

Preliminary value of active power reference value of cameraP _ref1Amplitude limiting processing is carried out to obtain the final value of the active power reference value of the phase modulatorP _ref2；

Outputting a final value of the phase modulator to a reactive power reference valueQ _ref2And final value of active power reference value of phase modulatorP _ref2Final value of reactive power reference value of phase modulatorQ _ref2And final value of active power reference value of phase modulatorP _ref2For effecting control of the camcorder.

For a description of a relevant part of a computer program storage medium provided in an embodiment of the present invention, please refer to a detailed description of a corresponding part in a phase modulator control method provided in the above embodiment of the present invention, which is not described herein again.

In another aspect, an embodiment of the present invention further provides another computer storage medium, on which a computer program is stored, where the computer program is used to implement:

Judging the DC side voltage of a converterE _dcWhether within the voltage dead band:

Preliminary value of converter q-axis current reference valueI _gqref1Amplitude limiting is carried out to obtain the final value of the q-axis current reference value of the converterI _gqref2；

Outputting final values of converter d-axis current reference value and converter q-axis current reference valueI _gqref2Final value of converter d-axis current reference and converter q-axis current referenceI _gqref2For effecting control of the camcorder.

For a description of a relevant part of another computer storage medium provided in an embodiment of the present invention, please refer to a detailed description of a corresponding part in a phase modulator control method provided in the above embodiment of the present invention, which is not described herein again.

The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Claims

1. A phase modulation machine control method, characterized in that the method comprises:

if not, calculating to obtain a preliminary value of the d-axis current reference value of the current transformer by adopting the following formulaI _gdref1：

，

Wherein the content of the first and second substances,E _dcreffor the grid-side converter dc-side voltage reference,E _dcis the dc side voltage of the grid side converter,K _pda proportional link constant is controlled for the direct current voltage of the grid-side converter,K _idthe integral element constant is controlled for the direct current voltage of the grid-side converter,sis Laplace operator;

preliminary value of d-axis current reference value of current transformerI _gdref1Carrying out amplitude limiting processing to obtain the final value of the d-axis current reference value of the converterI _gdref2；

If so, taking the previous value of the converter d-axis current reference value as the final value of the converter d-axis current reference valueI _gdref2；

Calculating to obtain a preliminary value of a converter q-axis current reference value by adopting the following formulaI _gqref1：

，

Wherein the content of the first and second substances,Q _greffor the ac side reactive power reference value of the grid side converter,Q _gis the reactive power of the AC side of the grid-side converter,K _gda proportional link constant is controlled for the reactive power at the AC side of the grid-side converter,K _igan integral link constant is controlled for the reactive power at the AC side of the grid-side converter,sis Laplace operator;

Outputting the final value of the d-axis current reference value of the converterI _gdref2And the final value of the converter q-axis current reference valueI _gqref2Final value of d-axis current reference value of said converterI _gdref2And the final value of the converter q-axis current reference valueI _gqref2For effecting control of the camcorder.

2. The method of claim 1, wherein said preliminary value for said converter q-axis current reference valueI _gqref1Amplitude limiting is carried out to obtain the final value of the q-axis current reference value of the converterI _gqref2The method comprises the following steps:

3. The method of claim 2, wherein said preliminary value for said converter q-axis current reference valueI _gqref1Before the clipping is carried out, the method comprises the following steps:

4. A method according to any of claims 1-3, characterized in that said preliminary value for said converter d-axis current reference valueI _gdref1Carrying out amplitude limiting processing to obtain the final value of the d-axis current reference value of the converterI _gdref2The method comprises the following steps:

5. A phase modifier control apparatus, comprising:

A judging unit for judging the DC side voltage of the converterE _dcWhether within the voltage dead band: if not, calculating to obtain a preliminary value of the d-axis current reference value of the current transformer by adopting the following formulaI _gdref1：

，

Wherein the content of the first and second substances,E _dcreffor the grid-side converter dc-side voltage reference,E _dcis the dc side voltage of the grid side converter,K _pda proportional link constant is controlled for the direct current voltage of the grid-side converter,K _idthe integral element constant is controlled for the direct current voltage of the grid-side converter,sis Laplace operator; preliminary value of d-axis current reference value of current transformerI _gdref1Carrying out amplitude limiting processing to obtain the final value of the d-axis current reference value of the converterI _gdref2(ii) a If so, taking the previous value of the converter d-axis current reference value as the final value of the converter d-axis current reference valueI _gdref2；

A calculating unit for calculating the preliminary value of the q-axis current reference value of the converter by adopting the following formulaI _gqref1：

，

An output unit for outputting the final value of the d-axis current reference value of the converterI _gdref2And the final value of the converter q-axis current reference valueI _gqref2Final value of d-axis current reference value of said converterI _gdref2And the final value of the converter q-axis current reference valueI _gqref2For effecting control of the camcorder.

6. The apparatus of claim 5, wherein the preliminary value for the converter q-axis current reference value is a preliminary valueI _gqref1Amplitude limiting is carried out to obtain the final value of the q-axis current reference value of the converterI _gqref2The method comprises the following steps:

7. The apparatus of claim 6, wherein the computing unit is further configured to:

8. Device according to any of claims 5-7, characterized in that said preliminary value for the current transformer d-axis current reference valueI _gdref1Carrying out amplitude limiting processing to obtain the final value of the d-axis current reference value of the converterI _gdref2The method comprises the following steps:

9. A phase modulation system, comprising:

a control device to acquire the power data and output a control signal according to the method of any of claims 1-4, the control signal comprising at least one of: the final value of the reactive power reference value of the phase modulator, the final value of the active power reference value of the phase modulator, the d-axis current reference value of the converter and the q-axis current reference value of the converter;

10. The system of claim 9, wherein the frequency converter comprises: a machine side converter and a grid side converter;

the machine side converter is connected with the asynchronous motor and the grid side converter, and the grid side converter is connected with a power grid.

11. The system of claim 10, wherein the machine side converter and the grid side converter are all-controlled converters.