CN110488713B - Control method of chain type SVG interphase hedging test system - Google Patents
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Abstract
The invention discloses a control method of a chain type SVG interphase hedging test system, which comprises the steps of firstly obtaining phase information of a port voltage of a grid-connected point and calculating to obtain a phase reference value of each phase conversion current chain; then calculating a reactive current instruction needing to rush two phases; then carrying out real-time closed-loop control on the direct-current voltage of the three-phase current conversion chain to obtain an active current component instruction; synthesizing the reactive current instruction and the active current component instruction to obtain a current instruction for short-circuit two phases; carrying out current closed-loop control on the short-circuit two phases and carrying out voltage open-loop control on the non-short-circuit phases to obtain the required value of each phase output voltage of the three-phase commutation chain; and finally, obtaining a drive control signal of each conversion current chain in each phase by utilizing phase-shift carrier modulation. The three-phase converter chain direct-current voltage stability test system is specially designed for a chain type SVG interphase hedge test mode, can maintain the stability of the three-phase converter chain direct-current voltage while carrying out interphase reactive hedge examination, and has strong robustness and strong adaptability.
Description
Technical Field
The invention belongs to the field of electrical engineering, and particularly relates to a control method of a chain type SVG interphase hedging test system.
Background
With the development of economic technology, electric energy becomes essential secondary energy in production and life of people, and endless convenience is brought to production and life of people. With the rapid development of new energy power generation and extra-high voltage power transmission technologies, the demand of a power grid on dynamic reactive power compensation equipment is urgent. In a reactive power device with dynamic reactive power compensation capability, a Static Var Generator (SVG) is concerned because of its fast response speed and small grid-connected harmonics.
In order to ensure that the SVG device can be put into operation successfully and stably once when arriving at a customer site, related test items are generally required to be completed as many as possible in an SVG factory test. At present, SVG factory test generally carries out item test on each component of SVG, such as a current conversion chain hedging test for testing a power module monomer, a whole machine no-load test for testing the voltage control capability of a device, a semi-physical simulation test for testing a control protection system, and the like, and the whole machine full-load test which simultaneously reaches rated voltage and rated current is not usually carried out under the limit of conditions. Only a small amount of SVG can carry out the on-load offset test with dragging test platform before leaving the factory, utilize condenser or reactor group or other SVG as accompanying and survey the reactive power equipment, avoid the power supply network capacity transfinite in factory. However, the method needs to configure accompanying reactive power equipment with the capacity equivalent to that of the tested SVG in a factory area, if the SVG capacity reaches hundreds of million, because the number of the SVG projects is small, a set of device can be produced for years, and it is difficult to find one accompanying SVG for carrying out power hedging, and if the device is used alone to build the hedging test platform, the cost of the test platform is too high.
The invention patent CN201810654389.X discloses a factory full load test method of a high-capacity SVG, which is characterized in that a three-phase SVG is reconstructed into a two-in-one-series connection mode, and then reactive power hedging test is carried out on two parallel phases. The phase-splitting examination and test of the SVG under rated voltage and rated current can be carried out under the condition that the external output capacity of the SVG is far smaller than the rated capacity of the SVG, additional accompanying equipment does not need to be added, the factory-leaving full-load test of the high-capacity SVG is conveniently realized under the limited factory power supply capacity, the structure of the corresponding test platform of the method is simple, the manufacturing cost is low, and the problem of efficient and economic full-load test of the SVG in a factory is solved. Compared with the conventional SVG, the test method has the structural characteristic that the SVG runs in a test mode with two parallel-serial SVG, but the connection mode is obviously different from the connection mode that the three phases of the existing SVG are respectively connected to the three phases of the power grid, so that the existing SVG closed-loop control method is not applicable any more.
Disclosure of Invention
The invention aims to provide a control method of a chain type SVG interphase hedging test system, which is used for realizing the real-time regulation and control of the voltage and the current of each phase conversion current chain in a special wiring mode of two parallel chains of the chain type SVG, thereby maintaining the continuous and stable operation of the SVG in a phase-splitting hedging test mode.
The invention provides a control method of a chain type SVG interphase hedging test system, which specifically comprises the following steps:
s1, obtaining phase information of a grid-connected point port voltage, and calculating to obtain a phase reference value of each phase conversion current chain;
s2, calculating a reactive current instruction of two phases to be hedged according to the preset hedging current and the phase reference value of each phase conversion current chain obtained in the step S1;
s3, carrying out real-time closed-loop control on the direct-current voltage of the three-phase current conversion chain so as to obtain an active current component instruction;
s4, synthesizing the reactive current command obtained in the step S2 and the active current component command obtained in the step S3 to obtain a current command for short-circuit two phases;
s5, carrying out current closed-loop control on the short-circuit two phases, and carrying out voltage open-loop control on the non-short-circuit phases so as to obtain a required value of each phase output voltage of the three-phase current conversion chain;
and S6, obtaining a drive control signal of each current conversion chain in each phase by utilizing phase-shift carrier modulation.
The step S1 of obtaining the phase information of the voltage of the point-to-point port specifically includes first detecting the voltage U of the point-to-point portacThen, a Phase Lock Loop (PLL) is used to extract the Phase theta of the voltage of the point-to-point portACThen using the phase theta of the grid-connected point port voltageACSubtracting 30 degrees to be used as voltage phase theta of short-circuit phase change current chainAAnd finally, the voltage phase theta of the short-circuited phase conversion current chain is usedASubtracting 120 degrees to be used as a voltage phase theta of a current chain connected with a power gridC。
Step S2, calculating the reactive current instruction of the two phases to be hedged, specifically calculating the reactive current instruction of the two phases to be hedged by using the following formula:
iaQ *＝IQ×cos(θA)
ibQ *＝-iaQ *＝-IQcos(θA)
in the formula iaQ *And ibQ *For reactive current commands requiring two phases to be opposed, IQIs a preset value of the opposed current thetaATo short the voltage phase of the phase inversion chain.
Step S3, performing real-time closed-loop control on the dc voltage of the three-phase converter chain to obtain the active current component instruction, specifically, performing real-time closed-loop control on the dc voltage of the three-phase converter chain by using three dc current loops to obtain three active current component instructions.
The method comprises the following steps of performing real-time closed-loop control on direct-current voltage of a three-phase converter chain to obtain an active current component instruction, specifically calculating to obtain the active current component instruction by adopting the following method:
iaP *＝PI(Udc_A *-Udc_A)×sin(θA)
ibP *＝PI(Udc_B *-Udc_B)×sin(θA)
icP *＝PI(Udc_C *-Udc_C)×cos(θA)
in the formula iaP *And ibP *For short-circuiting two-phase active current component commands, icP *An active current component instruction of a non-short-circuit phase; PI represents that closed-loop control is carried out by a PI controller; udc (u)A *And Udc \\B *Udc _, which is a direct voltage command for shorting two phasesC *The direct current voltage command is a non-short-circuit phase direct current voltage command; udc (u)AAnd Udc \\BFor short-circuiting the DC voltage feedback values of the two phases, Udc \ uCThe direct current voltage feedback value is a non-short-circuit phase direct current voltage feedback value; thetaATo short the voltage phase of the phase inversion chain.
Step S4, synthesizing the reactive current command obtained in step S2 and the active current component command obtained in step S3 to obtain a short-circuit two-phase current command, specifically synthesizing by using the following equation:
ia *＝iaQ *+iaP *
ib *＝ibQ *+ibP *+icP *
in the formula ia *And ib *Synthesizing the current instruction of the short-circuit two phases; i.e. iaQ *And ibQ *For reactive current commands requiring two phases to be opposed, iaP *And ibP *For short-circuiting two-phase active current component commands, icP *And the active current component command of the non-short-circuit phase.
Performing current closed-loop control on the short-circuit two phases and performing voltage open-loop control on the non-short-circuit phases so as to obtain a required value of each phase output voltage of the three-phase current conversion chain in the step S5; specifically, a classical PI controller is used for carrying out current closed-loop control on two short-circuit phases to obtain respective phase output voltage required values; and for the non-short-circuit phase, directly calculating the output voltage requirement value according to the preset voltage set value and the phase.
The control method of the chain type SVG interphase hedging test system is specially designed for a chain type SVG split-phase hedging test mode, is suitable for a special wiring mode that two phases of the SVG are connected in parallel and then connected in series with the other phase, and can maintain the stability of the direct-current voltage of the three-phase converter chain while carrying out interphase reactive hedging check, thereby keeping the continuous and stable operation of the system for long-term check. The method realizes closed-loop regulation and control on the direct-current voltage of the three-phase converter chain, so that even if the actual effect of part of links is easy to realize ideal working conditions due to factors such as system parameter errors, directional errors, control errors and the like, the method can be corrected through closed-loop regulation and control, thereby having strong robustness and strong adaptability; finally, the method of the invention is similar to most of modules in the structure of the SVG conventional split-phase control system, can be obtained by local transformation on the structure of the conventional control system, and has simple structure and easy realization.
Drawings
FIG. 1 is a schematic process flow diagram of the process of the present invention.
FIG. 2 is a main circuit structure diagram of a chain type SVG interphase hedging test system corresponding to the method of the present invention.
Detailed Description
Fig. 1 is a schematic diagram of a method flow of the method of the present invention, and a structure diagram of a main circuit of a corresponding chained SVG interphase hedging test system is shown in fig. 2.
In specific implementation, when the SVG phase-splitting hedging test is carried out, any two-phase port can be selected to be in short circuit, and the two-phase commutation chain is formed, is connected in parallel and then is connected in series with the third-phase commutation chain. The following description will describe in detail the implementation of the control method provided by the present invention, taking as an example the connection mode in which the AB two-phase port of the SVG is connected to the a-phase access point of the power grid after being short-circuited, and the C-phase is directly connected to the power grid.
The control method of the chain type SVG interphase hedging test system provided by the invention comprises the following steps
S1, obtaining phase information of a grid-connected point port voltage, and calculating to obtain a phase reference value of each phase conversion current chain; specifically, firstly, the voltage U of the grid-connected point port is detectedacThen, a Phase Lock Loop (PLL) is used to extract the Phase theta of the voltage of the point-to-point portACThen using the phase theta of the grid-connected point port voltageACSubtracting 30 degrees as the voltage phase theta of the A-phase converter chainAAnd finally the voltage phase theta of the A-phase converter chain is usedASubtracting 120 degrees to obtain the voltage phase theta of the C-phase converter chainC；
S2, calculating a reactive current instruction of two phases to be hedged according to the preset hedging current and the phase reference value of each phase conversion current chain obtained in the step S1; specifically, the reactive current instruction of two phases to be hedged is calculated by adopting the following formula:
iaQ *＝IQ×cos(θA)
ibQ *＝-iaQ *＝-IQcos(θA)
in the formula iaQ *And ibQ *For reactive current commands requiring two phases to be opposed, IQIs a preset value of the opposed current thetaAThe voltage phase of the short-circuit phase commutation chain, namely the voltage phase of the A-phase commutation chain;
s3, carrying out real-time closed-loop control on the direct-current voltage of the three-phase current conversion chain so as to obtain an active current component instruction; the method specifically comprises the steps that three direct current loops are utilized to respectively carry out real-time closed-loop regulation and control on direct current voltage of a three-phase converter chain, and three active current component instructions are obtained;
in specific implementation, the active current component command is calculated by adopting the following formula:
iaP *＝PI(Udc_A *-Udc_A)×sin(θA)
ibP *＝PI(Udc_B *-Udc_B)×sin(θA)
icP *＝PI(Udc_C *-Udc_C)×cos(θA)
in the formula iaP *And ibP *For the active current component command for short-circuiting two phases (i.e. the active current component command of phase A and the active current component command of phase B), icP *An active current component instruction of a non-short-circuit phase (namely a C-phase active current component instruction);PI represents that closed-loop control is carried out by a PI controller; udc (u)A *And Udc \\B *Udc (u) for short-circuiting two-phase direct-current voltage commands (i.e., a-phase direct-current voltage command and a B-phase direct-current voltage command)C *A direct-current voltage command of a non-short-circuit phase (namely, a C-phase direct-current voltage command); udc (u)AAnd Udc \\BUdc _ \ u for short-circuiting the DC voltage feedback values of the two phases (i.e., the A-phase DC voltage feedback value and the B-phase DC voltage feedback value)CThe direct current voltage feedback value of the non-short-circuit phase (namely, the direct current voltage feedback value of the C phase); thetaAThe voltage phase of the short-circuit phase commutation chain (the voltage phase of the A-phase commutation chain) is obtained;
in specific implementation, as in a conventional single-phase converter chain system, the direct-current voltage instruction value of each phase converter chain is different from the actual feedback value thereof and then regulated and controlled by a PI (proportional-integral) controller to obtain a numerical value equivalent to a current amplitude value, and then the numerical value is multiplied by corresponding fundamental wave sinusoidal signals to obtain an active regulation and control instruction; the fundamental wave sinusoidal signals in the AB two phases are sinusoidal waves corresponding to the phase of the A-phase voltage, and are exactly parallel to voltage vectors of respective converter chains, so that the fundamental wave sinusoidal signals can directly become an active current instruction; the fundamental wave sinusoidal signal in the phase C is a cosine wave corresponding to the phase of the phase A, the fundamental wave sinusoidal signal is just perpendicular to the output voltage of the phase A converter chain, but is not perpendicular to the output voltage of the phase C converter chain, so that the current does not affect the active balance of the phase A converter chain even if flowing through the phase A converter chain or the phase B converter chain, but can affect the active balance of the phase C converter chain;
s4, synthesizing the reactive current instruction obtained in the step S2 and the active current component instruction obtained in the step S3 to obtain a current instruction for short-circuit two phases; specifically, the synthesis is carried out by adopting the following formula:
ia *＝iaQ *+iaP *
ib *＝ibQ *+ibP *+icP *
in the formula ia *And ib *Synthesizing current instructions (namely an A-phase current instruction and a B-phase current instruction) of the two short-circuit phases;iaQ *and ibQ *To meet reactive current commands for two phases (i.e. A-phase reactive current command and B-phase reactive current command), iaP *And ibP *To short-circuit two-phase active current component commands (i.e. an A-phase active current command and a B-phase active current command), icP *An active current component instruction of a non-short-circuit phase (namely a C-phase active current instruction);
s5, carrying out current closed-loop control on the short-circuit two phases, and carrying out voltage open-loop control on the non-short-circuit phases so as to obtain a required value of each phase output voltage of the three-phase current conversion chain; specifically, a classical PI controller is used for carrying out current closed-loop control on an AB phase to obtain respective phase output voltage required values; for the C-phase current conversion chain, directly calculating the required value of the output voltage of the C-phase current conversion chain according to the set value of the C-phase voltage and the voltage phase thereof;
and S6, obtaining a drive control signal of each current conversion chain in each phase by utilizing phase-shift carrier modulation.
The principle of the control method of the invention is as follows: the first part in the phase A current instruction and the first part in the phase B current are mutually offset, namely power hedging is carried out, so that load assessment under given reactive current is realized; the second part in the phase-A current instruction and the second part in the phase-B current are used for regulating and controlling the active absorption power of respective converter chains so as to compensate the active loss caused by a valve group switch and a loop resistor, thereby maintaining the stability of the direct-current voltage of the phase-A converter chains and the direct-current voltage of the phase-B converter chains, and because the active loss of the loop of the SVG is far smaller than the reactive output value of the SVG, the current is far smaller than the SVG rated current; the third part in the B-phase current instruction is vertical to the B-phase branch voltage, so that the B-phase steady-state direct-current voltage cannot be influenced, but the component is adjusted to enable the grid-connected C-phase current direction to be basically vertical to the C-phase output voltage, so that the current in the C-phase valve group is mainly a reactive component, and meanwhile, the component is adjusted to enable the C-phase current to contain a certain active component which is in phase with or opposite to the C-phase voltage, so that the C-phase direct-current voltage is stabilized.
Claims (6)
1. A control method of a chain type SVG interphase hedging test system specifically comprises the following steps:
s1, phase information of the voltage of the grid-connected point port is obtained, and a phase reference value of each phase current chain is obtained through calculation;
s2, calculating reactive current commands of two phases to be hedged according to the preset hedged current and the phase reference value of each phase current conversion chain obtained in the step S1;
s3, carrying out real-time closed-loop control on the direct-current voltage of the three-phase converter chain, thereby obtaining an active current component instruction;
s4, synthesizing the reactive current command obtained in the step S2 and the active current component command obtained in the step S3 to obtain a current command for short-circuit two phases;
s5, carrying out current closed-loop control on the short-circuit two phases, and carrying out voltage open-loop control on the non-short-circuit phases, so as to obtain the required value of each phase output voltage of the three-phase commutation chain;
and S6, obtaining a driving control signal of each commutation chain in each phase by using phase-shift carrier modulation.
2. The method for controlling a chained SVG interphase hedging test system according to claim 1, wherein the step S1 of obtaining the phase information of the voltage of the point-to-be-connected port, specifically, detecting the voltage of the point-to-be-connected port firstU ac Then extracting the phase of the grid-connected point port voltage by using a phase-locked loop
Then using the phase of the grid-connected point port voltage
Subtracting 30 degrees to be used as the voltage phase of the short-circuit phase change current chain
And finally, the voltage phase of the short-circuited phase conversion current chain is used
Minus 120 °Then as the voltage phase of the current-converting chain connected with the power network
。
3. The control method of the chained SVG interphase hedging test system according to claim 1, wherein the step S2 is to calculate the reactive current command for two phases to be hedged, specifically, the reactive current command for two phases to be hedged is calculated by using the following formula:
in the formula
And
in order to command reactive current of two phases to be oppositely rushed,I Q is a preset value of the impulse current,
to short the voltage phase of the phase inversion chain.
4. The control method of the chained SVG interphase hedging test system according to claim 1, wherein step S3 is performed with real-time closed-loop control on the dc voltage of the three-phase converter chain to obtain the active current component command, specifically, three dc current loops are used to perform real-time closed-loop control on the dc voltage of the three-phase converter chain to obtain three active current component commands, and specifically, the active current component command is obtained by calculating according to the following formula:
in the formula
And
to short the active current component commands of the two phases,
an active current component instruction of a non-short-circuit phase; PI represents that closed-loop control is carried out by a PI controller;
and
to short the dc voltage command for both phases,
the direct current voltage command is a non-short-circuit phase direct current voltage command;Udc _A andUdc _B to short the dc voltage feedback values of the two phases,Udc _C the direct current voltage feedback value is a non-short-circuit phase direct current voltage feedback value;
to short the voltage phase of the phase inversion chain.
5. The method for controlling the chained SVG interphase hedging test system according to claim 1, wherein the step S4 is to synthesize the reactive current command obtained in the step S2 and the active current component command obtained in the step S3 to obtain the current command for shorting two phases, specifically, the method is synthesized by using the following equation:
in the formula
And
synthesizing the current instruction of the short-circuit two phases;
and
in order to command reactive current of two phases to be oppositely rushed,
and
to short the active current component commands of the two phases,
and the active current component command of the non-short-circuit phase.
6. The control method of the chained SVG interphase hedging test system according to claim 1, characterized in that said step S5 is performed by performing current closed-loop control on the shorted two phases and then performing voltage open-loop control on the non-shorted phases, thereby obtaining a required value of each phase output voltage of the three-phase converter chain; specifically, a PI controller is used for carrying out current closed-loop control on two short-circuit phases to obtain respective phase output voltage required values; and for the non-short-circuit phase, directly calculating the output voltage requirement value according to the preset voltage set value and the phase.
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