CN114039357A - Power distribution network voltage regulation and control system and method based on multi-compensation device coordination control - Google Patents
Power distribution network voltage regulation and control system and method based on multi-compensation device coordination control Download PDFInfo
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- CN114039357A CN114039357A CN202111315918.1A CN202111315918A CN114039357A CN 114039357 A CN114039357 A CN 114039357A CN 202111315918 A CN202111315918 A CN 202111315918A CN 114039357 A CN114039357 A CN 114039357A
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
A power distribution network voltage regulation and control system and method based on multi-compensation device coordination control comprises the following steps: the system comprises a coordination controller, a dynamic compensation device, a reactive compensation device and a voltage regulation device; the coordination controller is respectively in communication connection with the dynamic compensation device, the reactive compensation device and the voltage regulating device, acquires line operation data collected by the dynamic compensation device, the reactive compensation device and the voltage regulating device, distributes switching amount for the coordination controller, the dynamic compensation device, the reactive compensation device and the voltage regulating device which participate in regulation, and outputs corresponding control instruction signals; the control instruction signal is used for adjusting the dynamic compensation device, the reactive compensation device and the voltage regulating device, and the voltage regulation and control of the power distribution network based on the coordination control of the multiple compensation devices are realized. The coordinated operation of various adjusting devices in the distribution line is realized through the coordinated controller, the electric energy quality of the distribution line is comprehensively improved, the problems of low voltage, large reactive power shortage and the like in a distribution station area can be solved, and the comprehensive improvement of the whole line of the power transmission and distribution line is realized.
Description
Technical Field
The application relates to the technical field of power transmission and distribution regulation, in particular to a power distribution network voltage regulation and control system and method based on multi-compensation device coordination control.
Background
In recent years, with the development of economy, the demand for electricity of users is increasing, and the load of a power distribution network is increasing dramatically. The problems of overlong lines, too thin line diameters and the like commonly exist in the power distribution network, so that the line loss of the power distribution network is overlarge, the tail end voltage and the power factor are too low, and the normal power utilization of users is seriously influenced.
At present, the problems of power distribution network loss and power quality of a power distribution network are mainly improved from two aspects of power distribution network transformation and power distribution network operation state change. The transformation of the power distribution network comprises measures of line changing, station area increasing and the like; the change of the running state of the power distribution network comprises measures of adjusting user load, increasing reactive compensation, line voltage regulation and the like. Generally, measures for transforming the power distribution network involve a large amount of investment, and the actual implementation difficulty is high; in the measures for changing the running state of the power distribution network, the user load is difficult to adjust.
Therefore, the measures of changing the operation state of the power distribution network, such as adding reactive power compensation and line voltage regulators, are widely adopted. The device such as reactive compensation, line voltage regulator are additionally arranged, so that reactive power loss can be reduced, the terminal voltage can be increased, loss reduction and voltage quality improvement are realized, the investment cost is relatively low, the implementation is relatively easy, and good local effect can be achieved.
However, in the prior art, various adjusting devices installed on the line operate independently and cannot operate cooperatively, which may cause frequent switching of the compensation device, and since the variation amount of the device caused in the switching process is in a discrete form, large fluctuation and impact may occur in the switching process, which may cause short-time overvoltage or low voltage problems.
In addition, the failure of the adjustment devices to cooperate with each other at various locations of the line may result in an improvement in the local conditions at the installation site, but a deterioration condition occurs upstream or downstream of the installation site, and thus a comprehensive improvement of the entire line of the power transmission and distribution line cannot be achieved.
Disclosure of Invention
Aiming at the problems, the invention provides a power distribution network voltage regulation and control system and method based on multi-compensation device coordination control, so that various compensation devices installed on a power distribution line can work cooperatively, the electric energy quality of the power distribution line is comprehensively improved, the actual problems of low voltage, large reactive power shortage and the like of a power distribution station area are effectively solved, and the comprehensive improvement of the whole line of the power transmission and distribution line is realized.
Based on the purpose, the technical scheme provided by the application is as follows:
a distribution network voltage regulation and control system based on multi-compensation device coordinated control comprises:
the system comprises a coordination controller, a dynamic compensation device, a reactive compensation device and a voltage regulation device;
the controller is in communication connection with the dynamic compensation device, the reactive compensation device and the voltage regulating device respectively to acquire line operation data acquired by the dynamic compensation device, the reactive compensation device and the voltage regulating device;
the coordination controller comprises a voltage reactive power calculation module and a coordination control module;
the coordination control module comprises a sensitivity calculation unit and a coordination control unit;
the voltage reactive power calculation module is used for calculating physical quantity according to the line operation data; the physical quantities comprise voltage U, reactive power Q and voltage deviation delta U;
the sensitivity calculation unit is used for solving a reactive demand delta Q according to the physical quantity;
the coordination control unit is used for distributing switching quantities for the coordination controller, the dynamic compensation device, the reactive compensation device and the voltage regulating device which participate in regulation according to the voltage deviation delta U and the reactive demand delta Q, determining a dynamic regulation quantity QS of the dynamic compensation device, a switching group number k of the reactive compensation device and a voltage regulating gear n of the voltage regulating device, and outputting corresponding control instruction signals;
the control instruction signal is used for adjusting the dynamic compensation device, the reactive compensation device and the voltage regulating device, so that the voltage regulation and control of the power distribution network based on the coordination control of the multiple compensation devices are realized.
Preferably:
the line operation data comprises one or more of voltage, current, power factor, active physical quantity and reactive physical quantity.
Preferably:
the dynamic compensation device comprises a static synchronous compensator of the power distribution network.
Preferably:
the reactive power compensation device comprises an intelligent capacitor.
Preferably:
the voltage regulating device comprises a distribution transformer arranged at the head end of the line and an intelligent voltage regulator arranged at the tail end of the line.
A power distribution network voltage regulation and control method based on multi-compensation device coordination control is applied to any one of the power distribution network voltage regulation and control systems, and the method comprises the following steps:
acquiring line operation data collected by the dynamic compensation device, the reactive compensation device and the voltage regulation device;
calculating physical quantity according to the line operation data; the physical quantities comprise voltage U, reactive power Q and voltage deviation delta U; determining the regulation types of voltage and reactive power participating in regulation according to the physical quantity and a preset rule base, and solving a reactive power demand quantity delta Q;
distributing switching quantities for the coordination controller, the dynamic compensation device, the reactive compensation device and the voltage regulating device which participate in regulation according to the voltage deviation delta U and the reactive demand delta Q, determining a dynamic regulation quantity QS of the dynamic compensation device, a switching group number k of the reactive compensation device and a voltage regulating gear n of the voltage regulating device, and outputting corresponding control instruction signals;
the control instruction signal is used for adjusting the dynamic compensation device, the reactive compensation device and the voltage regulating device, so that the voltage regulation and control of the power distribution network based on the coordination control of the multiple compensation devices are realized.
Preferably:
the line operation data comprises one or more of voltage, current, power factor, active physical quantity and reactive physical quantity.
Preferably, the determining the regulation type of the voltage and reactive power participation regulation according to the physical quantity and a preset rule base includes:
the rule base divides a plane into nine areas according to a preset voltage upper limit value, a preset voltage lower limit value, a preset reactive upper limit value and a preset reactive lower limit value, and when the collected voltage real-time value and the collected reactive real-time value fall into different areas, the regulation types of voltage and reactive power participating in regulation are determined by adopting a nine-area graph control method;
the nine-zone map control method comprises the following steps:
when the voltage real-time value exceeds the voltage upper limit value and the reactive real-time value is lower than the reactive lower limit value, the voltage regulating device is regulated to reduce the voltage;
when the voltage real-time value is between the voltage upper limit value and the voltage lower limit value and the reactive real-time value is lower than the reactive lower limit value, reactive power is increased;
when the voltage real-time value is lower than the voltage lower limit value and the reactive real-time value is lower than the reactive lower limit value in a reactive mode, reactive boosting is added;
when the voltage real-time value is lower than the voltage lower limit value and the reactive real-time value is between the reactive upper limit value and the reactive lower limit value, adjusting the voltage regulating device to boost the voltage;
when the voltage real-time value is lower than the voltage lower limit value and the reactive real-time value does not exceed the reactive upper limit value, adjusting the voltage regulating device to boost voltage;
when the voltage real-time value is between the voltage upper limit value and the voltage lower limit value and the reactive real-time value is reactive and exceeds the reactive upper limit value, reducing reactive power;
when the voltage real-time value exceeds the voltage upper limit value and the reactive real-time value does not exceed the reactive upper limit value, reducing reactive power;
when the voltage real-time value exceeds the voltage upper limit value and the reactive real-time value is between the reactive upper limit value and the reactive lower limit value, the voltage regulating device is regulated to reduce the voltage;
and when the voltage real-time value is between the voltage upper limit value and the voltage lower limit value and the reactive real-time value is between the reactive upper limit value and the reactive lower limit value, no regulation control is performed.
Preferably, the calculating the reactive demand Δ Q includes:
calculating the sensitivity of the reactive power at the compensation point to the voltage change according to a sensitivity equation of load flow calculation, and further solving the reactive demand delta Q;
the sensitivity equation of the load flow calculation is as follows:
wherein, JH、JN、JJ、JLA Jacobian block matrix in a sensitivity equation for the load flow calculation, the Jacobian block matrix having elements of
Wherein P, Q, U and theta are respectively the active power, reactive power, voltage amplitude and voltage of the nodeThe phase angle is delta theta, delta U and delta P, delta P and delta Q are respectively the active power deviation and the reactive power deviation of the system;
when the active power is fixed, i.e. Δ P is 0,
reduced to Δ Q ═ JLΔU；
According to Δ Q ═ JLAnd delta U, determining the corresponding reactive power deviation when the node voltage is deviated, namely the reactive demand delta Q.
Preferably, the distributing switching amount for the coordination controller, the dynamic compensation device, the reactive compensation device and the voltage regulation device participating in regulation according to the voltage deviation Δ U and the reactive demand Δ Q includes:
if the delta Q is larger than 0, increasing the reactive compensation amount; meanwhile, if QS + delta Q is larger than or equal to QC, a group of reactive compensation devices are put into the reactive compensation device, and the reactive power of the dynamic compensation device is adjusted to QS + delta Q-QC; if QS + delta Q is less than QC, the reactive compensation device is not switched, and the reactive power of the dynamic compensation device is adjusted to QS + delta Q;
if the delta Q is less than 0, reducing the reactive compensation amount; meanwhile, if QS + delta Q is less than or equal to-QC, a group of reactive compensation devices are quitted, and the reactive power of the dynamic compensation devices is adjusted to QS + delta Q + QC; if QS + delta Q > -QC, the reactive power compensation device is not switched, and the reactive power of the dynamic compensation device is adjusted to QS + delta Q;
and the QC is the reactive power output capacity of a group of reactive power compensation devices.
By applying the technical scheme, the power distribution network voltage regulation and control system and method based on multi-compensation device coordination control provided by the application comprise: the system comprises a coordination controller, a dynamic compensation device, a reactive compensation device and a voltage regulation device; the controller is respectively in communication connection with the dynamic compensation device, the reactive compensation device and the voltage regulating device, acquires line operation data collected by the dynamic compensation device, the reactive compensation device and the voltage regulating device, distributes switching amount for the coordination controller, the dynamic compensation device, the reactive compensation device and the voltage regulating device which participate in regulation, and outputs corresponding control instruction signals; the control instruction signal is used for adjusting the dynamic compensation device, the reactive compensation device and the voltage regulating device, so that the voltage regulation and control of the power distribution network based on the coordination control of the multiple compensation devices are realized. This application has realized among the distribution lines dynamic compensation device, reactive power compensator, pressure regulating device's all kinds of adjusting device's cooperative operation through coordinated controller, has comprehensively promoted distribution lines electric energy quality, can effectively solve distribution station district voltage actual problem such as low on the throne, the idle volume is big, realizes the comprehensive improvement of the whole line of transmission and distribution lines.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a power distribution network voltage regulation and control system based on multi-compensation device coordination control according to the present application;
fig. 2 is a schematic flow chart of another power distribution network voltage regulation and control method based on multi-compensation device coordination control according to the present application;
fig. 3 is a schematic diagram of regions partitioned by a nine-region map control method adopted by a rule base according to an embodiment of the present application;
fig. 4 is a power distribution network line structure diagram applied to the power distribution network voltage regulation and control method based on multi-compensation device coordination control according to the embodiment of the present application;
fig. 5 is a schematic voltage reactive power regulation process diagram of a power distribution network voltage regulation method based on multi-compensation device coordination control according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following will specifically describe the scheme of the present application by specific examples:
fig. 1 is a schematic structural diagram of a power distribution network voltage regulation and control system based on multi-compensation device coordination control provided by the present application.
Referring to fig. 1, a power distribution network voltage regulation and control system based on multi-compensation device coordination control according to an embodiment of the present application includes:
the system comprises a coordination controller 1, a dynamic compensation device 2, a reactive compensation device 3 and a voltage regulation device 4;
the controller 1 is respectively in communication connection with the dynamic compensation device 2, the reactive compensation device 3 and the voltage regulation device 4 to acquire line operation data acquired by the dynamic compensation device 2, the reactive compensation device 3 and the voltage regulation device 4;
in an embodiment of the application, the line operation data comprises one or more of voltage, current, power factor, active physical quantity, and reactive physical quantity.
The coordination controller 1 comprises a voltage reactive power calculation module and a coordination control module;
the coordination control module comprises a sensitivity calculation unit and a coordination control unit;
the voltage reactive power calculation module is used for calculating physical quantity according to the line operation data; the physical quantities comprise voltage U, reactive power Q and voltage deviation delta U;
the sensitivity calculation unit is used for solving a reactive demand delta Q according to the physical quantity;
the coordination control unit is used for distributing switching quantities for the coordination controller, the dynamic compensation device, the reactive compensation device and the voltage regulating device which participate in regulation according to the voltage deviation delta U and the reactive demand delta Q, determining a dynamic regulation quantity QS of the dynamic compensation device, a switching group number k of the reactive compensation device and a voltage regulating gear n of the voltage regulating device, and outputting corresponding control instruction signals;
the control instruction signal is used for adjusting the dynamic compensation device, the reactive compensation device and the voltage regulating device, so that the voltage regulation and control of the power distribution network based on the coordination control of the multiple compensation devices are realized.
In the embodiment of the present application, the dynamic compensation device includes a Distribution network Static Synchronous Compensator (D-STATCOM), the reactive compensation device includes an intelligent capacitor, and the voltage regulation device includes a Distribution transformer installed at the head end of the line and an intelligent voltage regulator installed at the tail end of the line. The dynamic compensation device is adjusted by a power electronic device with quick response, and the caused variable quantity is in a continuous form; the reactive compensation device and the voltage regulating device participate in regulation by capacitor switching and voltage regulating gear switching, and the variation caused by the switching is in a discrete form.
Fig. 2 is a schematic flow chart of a power distribution network voltage regulation and control method based on multi-compensation device coordination control provided by the present application.
Referring to fig. 2, a power distribution network voltage regulation and control method based on multi-compensation device coordination control according to an embodiment of the present application is applied to any one of the power distribution network voltage regulation and control systems described above, and the method includes:
s1: acquiring line operation data acquired by a dynamic compensation device, a reactive compensation device and a voltage regulation device, wherein the line operation data comprises physical quantities such as voltage, current, power factors, active power, reactive power and the like;
s2: a voltage reactive power calculation module of the coordination controller analyzes and calculates physical quantities such as voltage, reactive power and the like at the collected positions of all devices of the line according to the obtained line operation data, and determines the type mode of voltage and reactive power participating in regulation according to the calculation result and the collected data and the rules of a rule base;
s3: after the adjustment type is determined, the sensitivity calculation unit of the coordination controller calculates the reactive power demand according to the data processed by the voltage reactive power calculation module;
s4: the coordination control unit of the coordination controller distributes switching amount to the devices participating in regulation according to the calculation results of the step S2 and the step S3 and generates control signals to be output;
s5: and generating control signals and transmitting the control signals to the dynamic compensation device, the reactive compensation device and the voltage regulating device, and enabling the devices to act according to the instructions to complete regulation.
According to the power distribution network voltage regulation and control method based on multi-compensation device coordination control, line operation data collected by a dynamic compensation device, a reactive compensation device and a voltage regulation device are obtained; calculating physical quantity according to the line operation data; the physical quantities comprise voltage U, reactive power Q and voltage deviation delta U; determining the regulation types of voltage and reactive power participating in regulation according to the physical quantity and a preset rule base, and solving a reactive power demand quantity delta Q; distributing switching quantities for the coordination controller, the dynamic compensation device, the reactive compensation device and the voltage regulating device which participate in regulation according to the voltage deviation delta U and the reactive demand delta Q, determining a dynamic regulation quantity QS of the dynamic compensation device, a switching group number k of the reactive compensation device and a voltage regulating gear n of the voltage regulating device, and outputting corresponding control instruction signals; the control instruction signal is used for adjusting the dynamic compensation device, the reactive compensation device and the voltage regulating device, so that the voltage regulation and control of the power distribution network based on the coordination control of the multiple compensation devices are realized. And after the control instruction signal is generated, the control instruction signal is transmitted to the dynamic compensation device, the reactive compensation device and the voltage regulating device to complete regulation.
In an embodiment of the application, the line operation data comprises one or more of voltage, current, power factor, active physical quantity, and reactive physical quantity.
Fig. 3 is a schematic diagram of regions partitioned by a nine-region map control method adopted by a rule base according to an embodiment of the present application.
Referring to fig. 3, in the embodiment of the present application, the determining, according to the physical quantity and a preset rule base, the regulation type of the voltage and reactive power participation regulation includes: the rule base is presetUpper limit value U of voltageHLower limit value of voltage ULReactive upper limit value QHAnd a reactive lower limit value QLDividing a plane into nine areas, and determining the adjustment types of voltage and reactive power participating in adjustment by adopting a nine-area graph control method when the acquired voltage real-time values and reactive power real-time values fall into different areas;
the nine-zone map control method comprises the following steps:
zone 1: when the voltage real-time value exceeds the voltage upper limit value and the reactive real-time value is lower than the reactive lower limit value, the voltage regulating device is regulated to reduce the voltage;
zone 2: when the voltage real-time value is between the voltage upper limit value and the voltage lower limit value and the reactive real-time value is lower than the reactive lower limit value, reactive power is increased;
zone 3: when the voltage real-time value is lower than the voltage lower limit value and the reactive real-time value is lower than the reactive lower limit value in a reactive mode, reactive boosting is added;
zone 4: when the voltage real-time value is lower than the voltage lower limit value and the reactive real-time value is between the reactive upper limit value and the reactive lower limit value, adjusting the voltage regulating device to boost the voltage;
zone 5: when the voltage real-time value is lower than the voltage lower limit value and the reactive real-time value does not exceed the reactive upper limit value, adjusting the voltage regulating device to boost voltage;
zone 6: when the voltage real-time value is between the voltage upper limit value and the voltage lower limit value and the reactive real-time value is reactive and exceeds the reactive upper limit value, reducing reactive power;
zone 7: when the voltage real-time value exceeds the voltage upper limit value and the reactive real-time value does not exceed the reactive upper limit value, reducing reactive power;
zone 8: when the voltage real-time value exceeds the voltage upper limit value and the reactive real-time value is between the reactive upper limit value and the reactive lower limit value, the voltage regulating device is regulated to reduce the voltage;
zone 9: and when the voltage real-time value is between the voltage upper limit value and the voltage lower limit value and the reactive real-time value is between the reactive upper limit value and the reactive lower limit value, no regulation control is performed.
Fig. 4 is a power distribution network line structure diagram applied to the power distribution network voltage regulation and control method based on multi-compensation device coordination control according to the embodiment of the present application.
In this embodiment of the present application, the obtaining the reactive demand Δ Q includes:
the sensitivity calculation unit calculates the sensitivity of the reactive power at the compensation point to the voltage change according to a sensitivity equation of load flow calculation, and then obtains the reactive demand delta Q;
sensitivity generally refers to the sensitivity of the system operation condition characterized by a state vector to the changes of a control vector and a disturbance vector, and the sensitivity equation of the load flow calculation can be expressed as:
wherein, JH、JN、JJ、JLA Jacobian block matrix in a sensitivity equation for the load flow calculation, the Jacobian block matrix having elements of
P, Q, U and theta are respectively the active power, the reactive power, the voltage amplitude and the voltage phase angle of the node, delta theta is the node voltage phase angle deviation, delta U is the node voltage deviation, and delta P and delta Q are respectively the active power deviation and the reactive power deviation of the system;
when the active power is fixed, i.e. Δ P is 0,
considering that the reactance is much larger than the resistance, formula
Can be simplified to Δ Q ═ JLΔU；
According to Δ Q ═ JLAnd delta U, determining the corresponding reactive power deviation when the node voltage is deviated, namely the reactive demand delta Q.
Fig. 5 is a schematic voltage reactive power regulation process diagram of a power distribution network voltage regulation method based on multi-compensation device coordination control according to an embodiment of the present application.
In this embodiment, the distributing switching amount of the coordination controller, the dynamic compensation device, the reactive compensation device and the voltage regulation device according to the voltage deviation Δ U and the reactive demand Δ Q for participating in regulation includes:
if the delta Q is larger than 0, increasing the reactive compensation amount; meanwhile, if QS + delta Q is larger than or equal to QC, a group of reactive compensation devices are put into the reactive compensation device, and the reactive power of the dynamic compensation device is adjusted to QS + delta Q-QC; if QS + delta Q is less than QC, the reactive compensation device is not switched, and the reactive power of the dynamic compensation device is adjusted to QS + delta Q;
if the delta Q is less than 0, reducing the reactive compensation amount; meanwhile, if QS + delta Q is less than or equal to-QC, a group of reactive compensation devices are quitted, and the reactive power of the dynamic compensation devices is adjusted to QS + delta Q + QC; if QS + delta Q > -QC, the reactive power compensation device is not switched, and the reactive power of the dynamic compensation device is adjusted to QS + delta Q;
and the QC is the reactive power output capacity of a group of reactive power compensation devices.
For example, when distributing the switching amount, based on the online sensitivity calculation, the reactive power to be compensated is distributed between the discrete variable and the continuous variable according to the coordination principle of "discrete variable priority action and continuous variable fine adjustment", and the coordination between the discrete variable and the continuous variable is performed according to the following principle:
if the reactive output of the STATCOM is QS, the reactive power output capacity of one group of capacitors is QC (if no capacitor can be put into the STATCOM at this time, QC is ∞), and Δ Q is the reactive demand caused by the voltage deviation;
1) if the delta Q is larger than 0, increasing the reactive compensation amount;
firstly, if QS + delta Q is larger than or equal to QC, a group of capacitors is put into the STATCOM, and meanwhile, the reactive power of the STATCOM is adjusted to QS + delta Q-QC;
if QS + delta Q is less than QC, the capacitor is not switched, and the STATCOM reactive power is adjusted to QS + delta Q;
2) if the delta Q is less than 0, reducing the reactive compensation amount;
if QS + delta Q is less than or equal to-QC, a group of capacitors is withdrawn, and meanwhile, the reactive power of the STATCOM is adjusted to QS + delta Q + QC;
and if QS + delta Q > -QC, the capacitor is not switched, and the STATCOM reactive power is adjusted to QS + delta Q.
In the embodiment of the application, the dynamic compensation device has a rapid adjustment capability, the voltage of the power distribution network line is maintained to be stable through rapid intervention in the switching transient process of the reactive compensation device and the voltage regulating device, the power compensation device and the voltage regulating device enter a steady-state working state, the dynamic compensation device adjusts output power to be in a smaller state along with the steady-state working state, and sufficient reactive capacity is reserved for the dynamic compensation device to participate in next adjustment.
The method for regulating and controlling the voltage of the power distribution network based on the multi-compensation-device coordination control provided by the embodiment of the application is applied to the system for regulating and controlling the voltage of the power distribution network based on the multi-compensation-device coordination control provided by the embodiment, and specific steps can be referred to in a one-to-one correspondence manner with functions of all modules of the system in the embodiment.
By applying the technical scheme, the application provides a distribution network voltage regulation and control system based on multi-compensation device coordination control, which comprises: the system comprises a coordination controller, a dynamic compensation device, a reactive compensation device and a voltage regulation device; the controller is respectively in communication connection with the dynamic compensation device, the reactive compensation device and the voltage regulating device, acquires line operation data collected by the dynamic compensation device, the reactive compensation device and the voltage regulating device, distributes switching amount for the coordination controller, the dynamic compensation device, the reactive compensation device and the voltage regulating device which participate in regulation, and outputs corresponding control instruction signals; the control instruction signal is used for adjusting the dynamic compensation device, the reactive compensation device and the voltage regulating device, so that the voltage regulation and control of the power distribution network based on the coordination control of the multiple compensation devices are realized. This application has realized among the distribution lines dynamic compensation device, reactive power compensator, pressure regulating device's all kinds of adjusting device's cooperative operation through coordinated controller, has comprehensively promoted distribution lines electric energy quality, can effectively solve distribution station district voltage actual problem such as low on the throne, the idle volume is big, realizes the comprehensive improvement of the whole line of transmission and distribution lines.
Compared with the prior art, the invention has the beneficial effects that:
(1) various adjusting devices of circuit have been realized: the dynamic compensation device, the reactive compensation device and the voltage regulation device work cooperatively, so that the voltage quality of the whole line is improved;
(2) the dynamic compensation device is organically matched with the voltage regulator and the capacitor, the discrete equipment acts preferentially, the continuous equipment is finely adjusted, the line voltage is ensured to be stable by means of the quick adjustment capability of the dynamic compensation device, the frequent switching and the large-amplitude fluctuation impact during the switching of the voltage regulator and the capacitor are avoided, and meanwhile, after the voltage regulator and the capacitor are put into stability, the compensation force of the dynamic compensation device is reduced, enough allowance is reserved, and voltage support can be provided for the next voltage fluctuation.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The power distribution network voltage regulation and control system and method based on multi-compensation device coordination control provided by the invention are introduced in detail, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. The utility model provides a distribution network voltage regulation and control system based on many compensation arrangement coordinated control which characterized in that includes:
the system comprises a coordination controller, a dynamic compensation device, a reactive compensation device and a voltage regulation device;
the coordination controller is in communication connection with the dynamic compensation device, the reactive compensation device and the voltage regulation device respectively to acquire line operation data acquired by the dynamic compensation device, the reactive compensation device and the voltage regulation device;
the coordination controller comprises a voltage reactive power calculation module and a coordination control module;
the coordination control module comprises a sensitivity calculation unit and a coordination control unit;
the voltage reactive power calculation module is used for calculating physical quantity according to the line operation data; the physical quantities comprise voltage U, reactive power Q and voltage deviation delta U;
the sensitivity calculation unit is used for solving a reactive demand delta Q according to the physical quantity;
the coordination control unit is used for distributing switching quantities for the coordination controller, the dynamic compensation device, the reactive compensation device and the voltage regulating device which participate in regulation according to the voltage deviation delta U and the reactive demand delta Q, determining a dynamic regulation quantity QS of the dynamic compensation device, a switching group number k of the reactive compensation device and a voltage regulating gear n of the voltage regulating device, and outputting corresponding control instruction signals;
the control instruction signal is used for adjusting the dynamic compensation device, the reactive compensation device and the voltage regulating device, so that the voltage regulation and control of the power distribution network based on the coordination control of the multiple compensation devices are realized.
2. The power distribution network voltage regulation and control system based on multi-compensation device coordinated control of claim 1, characterized in that:
the line operation data comprises one or more of voltage, current, power factor, active physical quantity and reactive physical quantity.
3. The power distribution network voltage regulation and control system based on multi-compensation device coordinated control of claim 1, characterized in that:
the dynamic compensation device comprises a static synchronous compensator of the power distribution network.
4. The power distribution network voltage regulation and control system based on multi-compensation device coordinated control of claim 1, characterized in that:
the reactive power compensation device comprises an intelligent capacitor.
5. The power distribution network voltage regulation and control system based on multi-compensation device coordinated control of claim 1, characterized in that:
the voltage regulating device comprises a distribution transformer arranged at the head end of the line and an intelligent voltage regulator arranged at the tail end of the line.
6. A power distribution network voltage regulation and control method based on multi-compensation device coordination control is applied to the power distribution network voltage regulation and control system according to any one of claims 1-5, and is characterized by comprising the following steps:
acquiring line operation data collected by the dynamic compensation device, the reactive compensation device and the voltage regulation device;
calculating physical quantity according to the line operation data; the physical quantities comprise voltage U, reactive power Q and voltage deviation delta U; determining the regulation types of voltage and reactive power participating in regulation according to the physical quantity and a preset rule base, and solving a reactive power demand quantity delta Q;
distributing switching quantities for the coordination controller, the dynamic compensation device, the reactive compensation device and the voltage regulating device which participate in regulation according to the voltage deviation delta U and the reactive demand delta Q, determining a dynamic regulation quantity QS of the dynamic compensation device, a switching group number k of the reactive compensation device and a voltage regulating gear n of the voltage regulating device, and outputting corresponding control instruction signals;
the control instruction signal is used for adjusting the dynamic compensation device, the reactive compensation device and the voltage regulating device, so that the voltage regulation and control of the power distribution network based on the coordination control of the multiple compensation devices are realized.
7. The method for regulating and controlling the voltage of the power distribution network based on the coordination control of the multiple compensation devices, according to claim 6, is characterized in that:
the line operation data comprises one or more of voltage, current, power factor, active physical quantity and reactive physical quantity.
8. The method for regulating and controlling the voltage of the power distribution network based on the coordinated control of the multiple compensation devices according to claim 6, wherein the determining of the regulation types of the voltage and reactive power participation regulation according to the physical quantity and a preset rule base comprises the following steps:
the rule base divides a plane into nine areas according to a preset voltage upper limit value, a preset voltage lower limit value, a preset reactive upper limit value and a preset reactive lower limit value, and when the collected voltage real-time value and the collected reactive real-time value fall into different areas, the regulation types of voltage and reactive power participating in regulation are determined by adopting a nine-area graph control method;
the nine-zone map control method comprises the following steps:
when the voltage real-time value exceeds the voltage upper limit value and the reactive real-time value is lower than the reactive lower limit value, the voltage regulating device is regulated to reduce the voltage;
when the voltage real-time value is between the voltage upper limit value and the voltage lower limit value and the reactive real-time value is lower than the reactive lower limit value, reactive power is increased;
when the voltage real-time value is lower than the voltage lower limit value and the reactive real-time value is lower than the reactive lower limit value in a reactive mode, reactive boosting is added;
when the voltage real-time value is lower than the voltage lower limit value and the reactive real-time value is between the reactive upper limit value and the reactive lower limit value, adjusting the voltage regulating device to boost the voltage;
when the voltage real-time value is lower than the voltage lower limit value and the reactive real-time value does not exceed the reactive upper limit value, adjusting the voltage regulating device to boost voltage;
when the voltage real-time value is between the voltage upper limit value and the voltage lower limit value and the reactive real-time value is reactive and exceeds the reactive upper limit value, reducing reactive power;
when the voltage real-time value exceeds the voltage upper limit value and the reactive real-time value does not exceed the reactive upper limit value, reducing reactive power;
when the voltage real-time value exceeds the voltage upper limit value and the reactive real-time value is between the reactive upper limit value and the reactive lower limit value, the voltage regulating device is regulated to reduce the voltage;
and when the voltage real-time value is between the voltage upper limit value and the voltage lower limit value and the reactive real-time value is between the reactive upper limit value and the reactive lower limit value, no regulation control is performed.
9. The method for regulating and controlling the voltage of the power distribution network based on the coordinated control of the multiple compensation devices according to claim 6, wherein the step of solving the reactive demand Δ Q comprises the following steps:
calculating the sensitivity of the reactive power at the compensation point to the voltage change according to a sensitivity equation of load flow calculation, and further solving the reactive demand delta Q;
the sensitivity equation of the load flow calculation is as follows:
wherein, JH、JN、JJ、JLA Jacobian block matrix in a sensitivity equation for the load flow calculation, the Jacobian block matrix having elements of
P, Q, U and theta are respectively the active power, the reactive power, the voltage amplitude and the voltage phase angle of the node, delta theta is the node voltage phase angle deviation, delta U is the node voltage deviation, and delta P and delta Q are respectively the active power deviation and the reactive power deviation of the system;
when the active power is fixed, i.e. Δ P is 0,
reduced to Δ Q ═ JLΔU；
According to Δ Q ═ JLAnd delta U, determining the corresponding reactive power deviation when the node voltage is deviated, namely the reactive demand delta Q.
10. The method for regulating and controlling the voltage of the power distribution network based on the multi-compensation-device coordination control according to claim 9, wherein the step of distributing switching quantities to the coordination controller, the dynamic compensation device, the reactive compensation device and the voltage regulation device which participate in the regulation according to the voltage deviation Δ U and the reactive demand Δ Q comprises the steps of:
if the delta Q is larger than 0, increasing the reactive compensation amount; meanwhile, if QS + delta Q is larger than or equal to QC, a group of reactive compensation devices are put into the reactive compensation device, and the reactive power of the dynamic compensation device is adjusted to QS + delta Q-QC; if QS + delta Q is less than QC, the reactive compensation device is not switched, and the reactive power of the dynamic compensation device is adjusted to QS + delta Q;
if the delta Q is less than 0, reducing the reactive compensation amount; meanwhile, if QS + delta Q is less than or equal to-QC, a group of reactive compensation devices are quitted, and the reactive power of the dynamic compensation devices is adjusted to QS + delta Q + QC; if QS + delta Q > -QC, the reactive power compensation device is not switched, and the reactive power of the dynamic compensation device is adjusted to QS + delta Q;
and the QC is the reactive power output capacity of a group of reactive power compensation devices.
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