CN111799815A - Chained STATCOM phase-to-phase direct-current voltage balance control method - Google Patents
Chained STATCOM phase-to-phase direct-current voltage balance control method Download PDFInfo
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- CN111799815A CN111799815A CN202010626122.7A CN202010626122A CN111799815A CN 111799815 A CN111799815 A CN 111799815A CN 202010626122 A CN202010626122 A CN 202010626122A CN 111799815 A CN111799815 A CN 111799815A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The application discloses a method for controlling the interphase direct-current voltage balance of a chain type STATCOM, which comprises the following steps: obtaining active power caused by the difference of three-phase units of the chain type STATCOM; when the power grid has an asymmetric fault, calculating active power generated by negative sequence voltage in real time; superposing the active power generated by the negative sequence voltage and the active power caused by the difference of the three-phase units of the chain type STATCOM to obtain the active power required to be regulated by the whole system; and calculating a zero sequence voltage value to be injected according to the active power and the zero sequence voltage calculation formula which are required to be adjusted by the whole system. The method based on zero sequence voltage injection provides a simple zero sequence voltage calculation method and a power feedforward control method aiming at the interphase direct current voltage unbalance caused by the difference of H bridge units and the negative sequence component in the voltage of the power grid, and can effectively inhibit the interphase direct current voltage unbalance fluctuation under different working conditions of the power grid.
Description
Technical Field
The application relates to the field of power electronic technology research, in particular to a chained STATCOM interphase direct-current voltage balance control method.
Background
Static Synchronous Compensator (STATCOM) has the functions of enhancing system stability, improving power flow and voltage distribution and the like, and is widely applied in recent years. The chain-type static synchronous compensator (STATCOM) has a great deal of attention due to the advantages of easiness in modularization implementation, high reliability, low switching loss, small harmonic distortion and the like. However, the direct-current side capacitors of the chain type STATCOM are independent of each other, and the direct-current voltages of the H bridge units are unbalanced due to the difference of the parallel loss, the switching loss, the modulation ratio, the pulse delay and the like of the H bridge units.
The existing research adopts a zero sequence voltage injection method to realize the balance control of the inter-phase direct current voltage, but the calculation is too complex. Meanwhile, when the power grid voltage is asymmetric, the negative sequence component in the power grid voltage can influence the voltage-sharing control of the interphase direct-current voltage, so that the direct-current voltage has large fluctuation, and the output of the chain type STATCOM is influenced.
Disclosure of Invention
The application provides a chained STATCOM phase-to-phase direct-current voltage balance control method, which is a simple zero-sequence voltage calculation method by deducing the output power relation of the chained STATCOM on the basis of the existing zero-sequence voltage injection method, and is a power feedforward control method aiming at the phase-to-phase direct-current voltage unbalance fluctuation caused by negative sequence components in voltage when the power grid voltage is asymmetric.
A method for controlling the inter-phase direct-current voltage balance of a chain-type STATCOM comprises the following steps:
acquiring active power caused by the difference of three-phase units of a chain type STATCOM under the symmetrical state of a power grid;
when the power grid has an asymmetric fault, calculating active power generated by negative sequence voltage in real time;
superposing the active power generated by the negative sequence voltage and the active power caused by the difference of the three-phase units of the chain type STATCOM to obtain the active power required to be regulated by the whole system;
and calculating a zero sequence voltage value to be injected according to the active power and the zero sequence voltage calculation formula which are required to be adjusted by the whole system.
Further, the obtaining active power caused by the chain type STATCOM three-phase unit difference is obtained by a PI controller, wherein the transfer function of the PI controller is as follows:
kpand kiRespectively representing a proportionality coefficient and an integration coefficient.
Further, when the power grid has an asymmetric fault, the active power generated by the negative sequence voltage is calculated in real time, wherein the negative sequence component expression in the three-phase power grid voltage is as follows:
in the formula usan、usbnAnd uscnRepresenting the negative sequence component, U, in the a, b and c three-phase grid voltages, respectivelynRepresenting the effective value of the negative sequence voltage, thetanRepresents the phase of the negative sequence voltage;
and calculating to obtain the active power generated by the negative sequence voltage at the moment by combining the effective value I of the output current.
Further, according to the superimposed active power, a zero sequence voltage value to be injected is calculated, wherein the zero sequence voltage value to be injected is calculated by the following formula:
in the formula uzRepresenting the desired zero sequence voltage, I being the effective value of the output current, Δ PkAnd (k, a, b and c) represents active power required to be regulated by the whole system.
According to the above technology, the application provides a method for controlling the inter-phase direct-current voltage balance of the chain-type STATCOM, and the method comprises the following steps: obtaining active power caused by three-phase unit difference; when the power grid has an asymmetric fault, calculating active power generated by negative sequence voltage in real time; superposing the active power generated by the negative sequence voltage and the active power caused by the difference of the three-phase units to obtain the active power required to be regulated by the whole system; and calculating a zero sequence voltage value to be injected according to the active power and the zero sequence voltage calculation formula which are required to be adjusted by the whole system. On the basis of the existing zero-sequence voltage injection method, a simple zero-sequence voltage calculation method is provided by deducing the output power relation of a chain type STATCOM, and meanwhile, when the power grid is asymmetric, the unbalanced fluctuation of the phase-to-phase direct current voltage caused by the negative sequence component in the voltage is considered, so that a power feedforward control method is provided, the problem that the existing research adopts the zero-sequence voltage injection method to calculate complicatedly is solved, and the voltage-sharing control of the whole system is realized aiming at the influence of the negative sequence component on the phase-to-phase direct current voltage.
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In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a flowchart of a method for controlling inter-phase dc voltage balance of a chain-type STATCOM according to the present application;
FIG. 2 is a block diagram of the power feed forward control of the present application;
fig. 3 is a block diagram of power control of dc voltages of respective phases according to the present application.
Detailed Description
Aiming at the inter-phase direct-current voltage balance control of the star-connected chain type STATCOM, the invention provides a novel inter-phase direct-current voltage control scheme, and the output power relation of the chain type STATCOM is deduced when the power grid is normal, so that a simple zero-sequence voltage calculation method is provided on the basis; and simultaneously, considering the influence of the negative sequence component when the power grid has an asymmetric fault, providing a power feedforward control method, and solving the fluctuation of the phase-to-phase direct current voltage when the power grid is asymmetric by calculating the active power generated by the negative sequence voltage in real time and feeding the power forward.
The different active power components in the three phases of the chain-link STATCOM can be described as:
through the formula, different active power components delta P in three phases can be foundkThe magnitude of the phase difference is related to the amplitude and the phase of the zero-sequence voltage output by the converter, therefore, the conclusion that the active power distribution between three phases of the converter can be adjusted by adjusting the zero-sequence voltage and the balance of the inter-phase direct-current voltage can be realized can be obtained, and the application provides the inter-phase direct-current voltage balance control method of the chain type STATCOM according to the theory.
Fig. 2 is a block diagram of the power feed forward control of the present application. U in the figuresan、usbnAnd uscnRepresenting the negative sequence component, U, in the a, b and c three-phase grid voltages, respectivelynRepresenting the effective value of the negative sequence voltage, thetanRepresenting the phase of the negative sequence voltage, I representing the effective value of the output current, udcref denotes a reference voltage, udca、udcb、udccThe dc voltages of the a, b, c three-phase H-bridge units are shown, respectively.
As shown in fig. 1 and 2, the present application provides a method for controlling inter-phase dc voltage balance of a chain STATCOM, the method comprising the following steps:
step S1, acquiring active power caused by the difference of three-phase units of the chain-type STATCOM in a symmetrical state of a power grid;
step S2, when the power grid has asymmetric faults, calculating the active power generated by the negative sequence voltage in real time;
step S3, the active power generated by the negative sequence voltage and the active power caused by the chain type STATCOM three-phase unit difference are superposed to obtain the active power required to be adjusted by the whole system;
and step S4, calculating the zero sequence voltage value to be injected according to the active power and zero sequence voltage calculation formula to be adjusted by the whole system.
In the application, the unbalance of the inter-phase direct-current voltages caused by the differences of the H-bridge units is mainly considered, so that the output voltage of the converter does not contain a negative sequence component under a symmetrical state, namely, only a positive sequence component and a zero sequence component exist, the obtained three-phase active power only consists of the same active power component in three phases and different active power components in the three phases, the sizes of the different active power components in the three phases are directly related to the amplitude and the phase of the zero sequence voltage output by the chain type STATCOM, and the distribution of the active power among the three phases can be adjusted by adjusting the zero sequence voltage, so that the balance of the inter-phase direct-current voltages is realized. And then the active power generated by the negative sequence voltage is superposed with the active power generated by the negative sequence voltage, so that the active power required to be regulated by the whole system is obtained. And finally, solving a zero sequence voltage value required to be injected by a zero sequence voltage calculation formula so as to realize the balance control of the interphase direct current voltage of the whole system.
Further, as shown in the power control block diagram of the dc voltage of each phase in fig. 3, it can be known that the active power obtained by the difference of three-phase units of the chain STATCOM is obtained by a PI controller, where the transfer function of the PI controller is:
kpand kiRespectively representing the scaling factor and productAnd (4) dividing coefficient.
Further, when the power grid has an asymmetric fault, the active power generated by the negative sequence voltage is calculated in real time, wherein the negative sequence component expression in the three-phase power grid voltage is as follows:
in the formula usan、usbnAnd uscnRepresenting the negative sequence component, U, in the a, b and c three-phase grid voltages, respectivelynRepresenting the effective value of the negative sequence voltage, thetanRepresents the phase of the negative sequence voltage;
and calculating to obtain the active power generated by the negative sequence voltage at the moment by combining the effective value I of the output current.
Here, the magnitude and phase of the negative sequence voltage are known and can be derived by a calculation formula of the negative sequence voltage.
In the power transmission system, the chain-type STATCOM only needs to output symmetrical reactive current to provide proper reactive support for the power system, the loss of the chain-type STATCOM is very small, the influence of active current components caused by the loss on the output current phase of the STATCOM is very small, so that the active current components can be ignored, the STATCOM only outputs the reactive current, and therefore when the power grid has an asymmetrical fault, the output current of the chain-type STATCOM can still be represented by the current in normal operation. Since the nature and magnitude of the chain STATCOM output current is given by the upper layer control instructions, it can be considered generally known.
When the asymmetric fault occurs, active power exchange exists between three phases of the chain type STATCOM due to the negative sequence component in the power grid voltage, and therefore phase-to-phase direct current voltage unbalance occurs, after the expression of the negative sequence component in the power grid voltage is obtained, the active power generated by the negative sequence voltage can be calculated by combining the known effective value I of the output current.
Further, according to the superimposed active power, a zero sequence voltage value to be injected is calculated, wherein the zero sequence voltage value to be injected is calculated by the following formula:
in the formula uzRepresenting the desired zero sequence voltage, I being the effective value of the output current, Δ PkAnd (k, a, b and c) represents active power required to be regulated by the whole system.
The power feedforward device is used for feeding forward active power generated by negative sequence power calculated in real time and overlapping the active power with unbalanced power generated by three-phase difference obtained in the previous step, and further obtaining active power delta P required to be adjusted by the whole systemkAnd finally, calculating according to the zero sequence voltage calculation formula to obtain the zero sequence voltage to be injected. In the application, the condition that the inter-phase direct-current voltage imbalance is caused by the difference of the H bridge units in a symmetrical state is mainly considered, so that the unbalanced power at the moment refers to different active power components in three phases.
In the application, the unbalance of the inter-phase direct-current voltages caused by the difference of the H-bridge units is mainly considered, so that the output voltage of the converter does not contain a negative sequence component under a symmetrical state, namely only a positive sequence component and a zero sequence component exist, and the obtained three-phase active power only consists of the same active power component in three phases and different active power components in the three phases. Meanwhile, the nature and the magnitude of the output current of the chain-type STATCOM are given by an upper-layer control instruction and can be generally considered to be known. And the loss of the chain-type STATCOM is very small, the influence of the active current component caused by the loss on the output current phase of the STATCOM is very small, so that the active current component can be ignored, the STATCOM only outputs reactive current, and the expressions of different active power components in three phases can be obtained through the output voltage and the output current component of the converter, so that the zero sequence voltage can be quickly calculated. Meanwhile, when an asymmetric fault occurs in a power grid, active power exchange exists between three phases of the chain type STATCOM caused by negative sequence voltage, and direct current voltage has larger fluctuation due to the fact that feedback control cannot respond in time, and in order to effectively improve the response speed of a control system, the invention provides a power feedforward control method, and the power feedforward control method is superposed with active power caused by difference of H bridge units to obtain active power required to be adjusted by the whole system, further obtain zero sequence voltage required to be injected by the whole system, and finally realize balance control of the chain type STATCOM inter-phase direct current voltage of the whole system.
Claims (4)
1. A method for controlling the balance of direct current voltage between phases of a chain type STATCOM is characterized by comprising the following steps:
acquiring active power caused by the difference of three-phase units of a chain type STATCOM under the symmetrical state of a power grid;
when the power grid has an asymmetric fault, calculating active power generated by negative sequence voltage in real time;
superposing the active power generated by the negative sequence voltage and the active power caused by the difference of the three-phase units of the chain type STATCOM to obtain the active power required to be regulated by the whole system;
and calculating a zero sequence voltage value to be injected according to the active power and the zero sequence voltage calculation formula which are required to be adjusted by the whole system.
2. The method of claim 1, wherein the obtaining the active power caused by the chain STATCOM three-phase cell difference is obtained by a PI controller, wherein a transfer function of the PI controller is:
kpand kiRespectively representing a proportionality coefficient and an integration coefficient.
3. The method according to claim 1, characterized in that the active power generated by the negative sequence voltage is calculated in real time when the power grid has an asymmetric fault, wherein the negative sequence component in the three-phase power grid voltage is expressed as:
in the formula usan、usbnAnd uscnRepresenting the negative sequence component, U, in the a, b and c three-phase grid voltages, respectivelynRepresenting the effective value of the negative sequence voltage, thetanRepresents the phase of the negative sequence voltage;
and calculating to obtain the active power generated by the negative sequence voltage at the moment by combining the effective value I of the output current.
4. The method of claim 1, wherein the zero sequence voltage value to be injected is calculated by the following formula:
in the formula uzRepresenting the desired zero sequence voltage, I being the effective value of the output current, Δ PkAnd (k, a, b and c) represents active power required to be regulated by the whole system.
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