CN103490407A - Synchronous detection method between flexible direct-current power transmission controllers - Google Patents

Abstract

The invention discloses a synchronous detection method between flexible direct-current power transmission controllers. The method solves the technical problems that control signals between the controllers are not synchronous, and accordingly the final valve controller will lose a control pulse calculating the step size, the current of a converter oscillates periodically, and a system is not stable. A controller device A and a controller device B are included, the controller device A comprises a controller A and a controller A recording and playing device, the controller device B comprises a controller B and a controller B recording and playing device, and the control signals are transmitted from the controller A to the controller B. The method has the advantages that whether the two controllers are synchronous can be visually checked, control mistakes are prevented, the current of the converter is prevented from oscillating periodically, and stability of the system is improved.

Description

Synchronization detecting method between a kind of flexible DC power transmission controller

Technical field:

The invention belongs to field, flexible DC power transmission field, relate to a kind of judge in the flexible DC power transmission system synchronization detecting method whether synchronous between each controller, the synchronization detecting method between especially a kind of flexible DC power transmission controller.

Background technology:

Technology of HVDC based Voltage Source Converter is one of outer high-power electric and electronic research field Focal point and difficult point of Present Domestic.It adopts the power electronic device such as high-power IGBT, can realize the independent control of active power and reactive power, and not need the electrical network commutation voltage to support, and can power to passive system.Adopt the full-control type device, transient voltage falls etc. in transient process and not there will be commutation failure.When trend is reversed, direct current direction reversion and direct voltage polarity is constant, and between converter without communication, be conducive to form the multi-terminal HVDC transmission system in parallel that load disturbance easily has again higher reliability, have broad application prospects.

But Technology of HVDC based Voltage Source Converter still lacks and builds and operating experience in the world at present, Technology of HVDC based Voltage Source Converter is in developing stage at home and abroad, the controllers such as the system control of flexible DC power transmission system, the control of standing, valve control all need simultaneous techniques, but rarely have description about controlling synchronous problem both at home and abroad, about controller, whether synchronous determination methods also seldom.The controller of flexible DC power transmission system is the controllers such as digital processing unit (DSP) or programmable gate array (FPGA), and between each controller, communication is carried out at interval regular time (calculating step-length).If control signal between each controller (modulating wave) is asynchronous, can cause final valve control can lose a control impuls of calculating step-length, cause the concussion of current transformer current cycle, cause that system is unstable.

Summary of the invention:

The object of the invention is to overcome the shortcoming of above-mentioned prior art, synchronous detection system and method between a kind of flexible DC power transmission controller are provided, solve control signal between each controller (modulating wave) asynchronous, can cause final valve control can lose the control impuls of a calculating step-length, cause the concussion of current transformer current cycle, cause the unsettled technical problem of system.

The objective of the invention is to solve by the following technical programs:

Synchronous detection system between a kind of flexible DC power transmission controller, comprise A control device and B control device, and the A control device comprises controller A and controller A recorded broadcast device; The B control device comprises controller B and controller B recorded broadcast device, and control signal sends to controller B from controller A.

Synchronization detecting method between a kind of flexible DC power transmission controller, arrange A control device and B control device, and the A control device comprises controller A and controller A recorded broadcast device; The B control device comprises controller B and controller B recorded broadcast device, makes control signal send to controller B from controller A.

As shown in Figure 2, step is described below the flow chart of synchronism detection:

(1) controller of A covering device sends the three-phase modulations ripple of pure order to B covering device controller, and wherein the three-phase modulations ripple of pure order is defined as:

Wherein, u _a, u _b, u _cfor instantaneous three-phase modulations ripple, ω is angular frequency, and t is the time,

for initial angle.

(2) the three-phase modulations ripple that controller A recorded broadcast device sends controller A carries out recorded broadcast, and three-phase modulations ripple controller B received with Time Controller B recorded broadcast device carries out recorded broadcast.

(3) record ripple signal controller A wave recording device obtained carries out the PARK conversion, checks whether its dq0 has sudden change.The PARK transform definition is as follows:

$\left[\begin{array}{c}{u}_d\\ u_q\\ u_0\end{array}\right]=\frac{2}{3}\left[\begin{array}{ccc}\cos \left(\mathrm{\ωt}\right)& \cos (\mathrm{\ωt}-\frac{2\mathrm{\π}}{3})& \cos (\mathrm{\ωt}+\frac{2\mathrm{\π}}{3})\\ -\sin \left(\mathrm{\ωt}\right)& -\sin (\mathrm{\ωt}-\frac{2\mathrm{\π}}{3})& -\sin (\mathrm{\ωt}-\frac{2\mathrm{\π}}{3})\\ \frac{1}{2}& \frac{1}{2}& \frac{1}{2}\end{array}\right]\left[\begin{array}{c}{u}_a\\ u_b\\ u_c\end{array}\right]$

Wherein, u _a, u _b, u _cfor instantaneous three-phase modulations ripple, u _d, u _q, u ₀for the dq0 component, ω is angular frequency, and t is the time.

(4) if the dq0 that step (3) PARK conversion obtains has sudden change, revise A cover controller and send the modulating wave algorithm, re-start step (1).If the dq0 that step (3) PARK conversion obtains is unchanged, carry out step (5).

(5) recorded broadcast of B covering device is carried out to the PARK conversion, check whether dq0 has sudden change.

(6) if the dq0 that step (5) PARK conversion obtains has sudden change, illustrate between two devices problem is synchronously arranged, need to revise B cover controller receiving algorithm, if there is not sudden change, synchronous success is described.

Whether beneficial effect of the present invention is: adopt the present invention can intuitively search between two controllers synchronous, prevent from controlling and make mistakes, the concussion of current transformer current cycle, the stability of improvement system.

The accompanying drawing explanation:

Fig. 1 is control device structural representation of the present invention;

Fig. 2 is synchronous detection algorithm implementation process figure of the present invention;

Fig. 3 is the three-phase modulations ripple figure that controller A of the present invention sends;

Fig. 4 is the dq0 signal graph obtained from A cover record ripple of the present invention;

Fig. 5 is the dq0 signal graph obtained from B cover record ripple of the present invention.

Embodiment:

Below in conjunction with accompanying drawing, the present invention is described in further detail:

The cover of two shown in of the present invention control devices are (referring to mistake referring to Fig. 2,3,4,5! Do not find Reference source.), all comprise at least one controller and a recorded broadcast device; Wherein A cover controller comprises controller A and controller A recorded broadcast device; The B control device comprises controller B and controller B recorded broadcast device.Control signal sends to controller B from controller A.Take certain Practical Project as example, check the stationary problem between two cover controllers.Process is as follows:

(1) controller of A covering device sends to B covering device controller the three-phase modulations ripple that the 50Hz amplitude is 144 pure orders, and wherein the three-phase modulations ripple of pure order is defined as:

$\left\{\begin{array}{c}{u}_a=144\×\sin \left(100\mathrm{\πt}\right)\\ u_b=144\×\sin (100\mathrm{\πt}-\frac{2}{3}\mathrm{\π})\\ u_c=144\×\sin (100\mathrm{\πt}+\frac{2}{3}\mathrm{\π})\end{array}\right.$

(2) the three-phase modulations ripple that controller A recorded broadcast device sends controller A is recorded ripple, and three-phase modulations ripple controller B received with Time Controller B recorded broadcast device carries out recorded broadcast; The three-phase modulations waveform as shown in Figure 3.

(3) record ripple signal controller A wave recording device obtained carries out the PARK conversion, checks whether its dq0 has sudden change.The signal obtained in this example is as shown in Figure 4:

(4) can find out from the graph, dq0 axle component, without obvious sudden change, illustrates that the modulating wave sent is correct, therefore carries out step (5), and the recorded broadcast of B covering device is carried out to the PARK conversion.

(5) recorded broadcast of B covering device is carried out to the PARK conversion, result as shown in Figure 5.

The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention, any those skilled in the art, within not breaking away from the technical solution of the present invention scope, when the method that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, still belong in the scope of technical solution of the present invention.

Claims (3)

1. the synchronous detection system between a flexible DC power transmission controller, it is characterized in that: comprise A control device and B control device, the A control device comprises controller A and controller A recorded broadcast device; B cover controller comprises controller B and controller B recorded broadcast device, and control signal sends to controller B from controller A.

2. the synchronization detecting method between a flexible DC power transmission controller, it is characterized in that: A control device and B control device are set, and the A control device comprises controller A and controller A recorded broadcast device; The B control device comprises controller B and controller B recorded broadcast device, makes control signal send to controller B from controller A.

3. the synchronization detecting method between the flexible DC power transmission controller as claimed in claim 2 is characterized in that:

(1) controller of A covering device sends the three-phase modulations ripple of pure order to B covering device controller, and wherein the three-phase modulations ripple of pure order is defined as:

Wherein, u _a, u _b, u _cfor instantaneous three-phase modulations ripple, ω is angular frequency, and t is the time,

for initial angle;

(2) the three-phase modulations ripple that controller A recorded broadcast device sends controller A carries out recorded broadcast, and three-phase modulations ripple controller B received with Time Controller B recorded broadcast device carries out recorded broadcast;

(3) record ripple signal controller A wave recording device obtained carries out the PAPK conversion, checks whether its dq0 has sudden change.The PAPK transform definition is as follows:

$\left[\begin{array}{c}{u}_d\\ u_q\\ u_0\end{array}\right]=\frac{2}{3}\left[\begin{array}{ccc}\cos \left(\mathrm{\ωt}\right)& \cos (\mathrm{\ωt}-\frac{2\mathrm{\π}}{3})& \cos (\mathrm{\ωt}+\frac{2\mathrm{\π}}{3})\\ -\sin \left(\mathrm{\ωt}\right)& -\sin (\mathrm{\ωt}-\frac{2\mathrm{\π}}{3})& -\sin (\mathrm{\ωt}-\frac{2\mathrm{\π}}{3})\\ \frac{1}{2}& \frac{1}{2}& \frac{1}{2}\end{array}\right]\left[\begin{array}{c}{u}_a\\ u_b\\ u_c\end{array}\right]$

Wherein, u _a, u _b, u _cfor instantaneous three-phase modulations ripple, u _b, u _q, u ₀for the dq0 component, ω is angular frequency, and t is the time;

(4) if the dq0 that step (3) PARK conversion obtains has sudden change, revise A cover controller and send the modulating wave algorithm, re-start step (1); If the dq0 that step (3) PARK conversion obtains is unchanged, carry out step (5);

(5) recorded broadcast of B covering device is carried out to the PARK conversion, check whether dq0 has sudden change;

(6) if the dq0 that step (5) PARK conversion obtains has sudden change, illustrate between two devices problem is synchronously arranged, need to revise B cover controller receiving algorithm, if there is not sudden change, synchronous success is described.

Images