CN112383080A - Closed loop control method and device for alternating current-direct current hybrid operation power grid - Google Patents

Closed loop control method and device for alternating current-direct current hybrid operation power grid Download PDF

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CN112383080A
CN112383080A CN202011384788.2A CN202011384788A CN112383080A CN 112383080 A CN112383080 A CN 112383080A CN 202011384788 A CN202011384788 A CN 202011384788A CN 112383080 A CN112383080 A CN 112383080A
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loop
power
loop closing
closed
power grid
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CN112383080B (en
Inventor
蔡建逸
林裕新
白浩
陈伟翔
陈琪烽
廖绍谦
李奕武
陈楠
刘晓枫
朱俊樾
林晓慧
沈伟
高永键
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Guangdong Power Grid Co Ltd
Shantou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Shantou Power Supply Bureau of Guangdong Power Grid Co Ltd
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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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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Abstract

The embodiment of the invention discloses a loop closing control method and device for an alternating current and direct current hybrid operation power grid, wherein the loop closing control method for the alternating current and direct current hybrid operation power grid comprises the following steps: acquiring a wiring diagram and line data of a power grid; determining a closed loop current constraint condition, a closed loop power constraint condition and a power flow equation of each node of a circuit where a target closed loop point is located according to a wiring diagram and circuit data of a power grid; taking a closed loop current constraint condition, a closed loop power constraint condition and a power flow equation as a closed loop current constraint model; determining the size of a closed loop boundary parameter under different simulated closed loop states based on a closed loop current constraint model; and determining a control strategy of the safe loop closing according to the size of the loop closing boundary parameter, and controlling the power grid loop closing operation based on the control strategy. The loop closing control method and device for the alternating current-direct current hybrid operation power grid can guarantee the safety and reliability of loop closing operation.

Description

Closed loop control method and device for alternating current-direct current hybrid operation power grid
Technical Field
The embodiment of the invention relates to a power grid loop closing technology, in particular to a loop closing control method and device for an alternating current-direct current hybrid operation power grid.
Background
In an electric power system, when equipment needs to be overhauled or a line has a fault, in order to ensure the continuity of power supply, a loop closing operation is usually performed on a power grid, so that the normal power supply of a non-overhauling section or a non-fault section is ensured. The loop closing operation can realize uninterrupted switching, and the power failure times and power failure time of a user can be greatly reduced, so that the loop closing operation is carried out on the power grid when a line is overhauled or broken down, and the continuous power supply of the power grid is ensured.
At present, in the existing loop closing management and control method for the alternating current-direct current hybrid operation power grid, loop closing operation can be performed usually when phase sequence and phase sequence of voltage on two sides of a loop closing point are checked to be consistent, but for the alternating current-direct current hybrid power grid with a power flow control strategy, due to more voltage grades, if only the phase sequence and the phase sequence are checked, power flow roundabout may be caused, equipment overload or tripping is further caused, and safety operation of the power grid is seriously threatened.
Disclosure of Invention
The embodiment of the invention provides a loop closing control method and device for an alternating current-direct current hybrid operation power grid, and aims to ensure the safety and reliability of loop closing operation.
In a first aspect, an embodiment of the present invention provides a closed loop control method for an ac/dc hybrid operation power grid, including:
acquiring a wiring diagram and line data of a power grid;
determining a closed loop current constraint condition, a closed loop power constraint condition and a power flow equation of each node of a circuit where a target closed loop point is located according to a wiring diagram and circuit data of a power grid;
taking a closed loop current constraint condition, a closed loop power constraint condition and a power flow equation as a closed loop current constraint model;
determining the size of a closed loop boundary parameter under different simulated closed loop states based on a closed loop current constraint model;
and determining a control strategy of the safe loop closing according to the size of the loop closing boundary parameter, and controlling the power grid loop closing operation based on the control strategy.
Optionally, determining a closed loop current constraint condition according to a wiring diagram and line data of a power grid, including:
determining an overcurrent I-section protection fixed value I of a line where a target loop closing point is located according to a wiring diagram and line data of a power gridi over-current I；
Will IM≤Ii over-current IAs loop closing transient current constraint conditions; wherein, IMAnd i is a maximum current instantaneous value after the loop closing of the circuit where the target loop closing point is located, and i is a circuit node on two sides of the target loop closing point.
Optionally, determining a closed loop current constraint condition according to a wiring diagram and line data of a power grid, including:
based on the wiring diagram and the line data of the power grid,determining overcurrent II-section protection fixed value I of circuit where target loop closing point is locatedi overcurrent II；
Will Ii≤Ii overcurrent IIAs loop closing transient current constraint conditions; wherein, IiAnd i is a steady-state current after the loop closing of the circuit where the target loop closing point is located, and i is a circuit node on two sides of the target loop closing point.
Optionally, determining a closed loop power constraint condition according to a wiring diagram and line data of a power grid, including:
determining power thresholds of two ends of a transformer substation connected with a line where a target loop closing point is located according to a wiring diagram and line data of a power grid;
and taking power thresholds at two ends of the transformer substation as closed loop power constraint conditions.
Optionally, determining the size of the loop closing boundary parameter in different simulated loop closing states based on the loop closing current constraint model includes:
when the power grid simulates closed-loop operation, acquiring impedance of a transformer substation side connected with a circuit where a closed-loop point is located in each simulated closed-loop state, power output to an electricity load branch circuit by the transformer substation and bus voltage on two sides of the closed-loop point;
and substituting the impedance at the side of the transformer substation, the power output to the power load branch circuit by the transformer substation and the bus voltage at two sides of the loop closing point into the loop closing current constraint model to obtain the size of the loop closing boundary parameter.
Optionally, determining a control policy for safely closing the loop according to the parameter size of the loop closing boundary parameter, and controlling the power grid loop closing operation based on the control policy, including:
and adjusting the pressure difference on two sides of the loop closing point, the output power of the circuit where the loop closing point is located and the direct current output power to be smaller than the parameter values of the corresponding parameters in the loop closing boundary parameters according to the parameter size of the loop closing boundary parameters.
Optionally, the management and control policy of the security loop includes: adjusting the pressure difference on the two sides of the loop closing point to be smaller than the pressure difference in the loop closing boundary parameter, and determining that the switch at the loop closing point is closed; determining that the direct current output power of a circuit where a loop closing point is located and a power supply is smaller than the direct current power in the loop closing boundary parameter; before the loop closing operation, adjusting the pressure difference on two sides of the loop closing point to be smaller than the pressure difference in the loop closing boundary parameter; and adjusting the output of the fan connected with the wind power plant by the circuit with the loop closing point before the loop closing operation to be smaller than the output power of the fan in the loop closing boundary parameter.
Optionally, the power flow equation is expressed by a PQ decomposition method of the voltage of each node of the line where the target loop closing point is located, and the power flow equation of the PQ decomposition method is as follows:
Figure BDA0002809346900000031
where, -B' is a modified susceptance matrix without parallel branches, and θ and V are the phase and amplitude of the voltage, respectively.
Optionally, the loop closing boundary parameter includes a voltage difference between two sides of the loop closing point, an impedance between two sides of the loop closing point, and an output power of a circuit where the loop closing point is connected to the power supply.
In a second aspect, an embodiment of the present invention further provides a closed loop control device for an ac/dc hybrid operation power grid, including:
the data acquisition module is used for acquiring a wiring diagram and line data of a power grid;
the constraint condition determining module is used for determining a closed-loop current constraint condition, a closed-loop power constraint condition and a power flow equation of each node of a circuit where a target closed-loop point is located according to a wiring diagram and circuit data of a power grid;
the constraint model determining module is used for taking the closed-loop current constraint condition, the closed-loop power constraint condition and the power flow equation as a closed-loop current constraint model;
the boundary parameter determining module is used for determining the size of the closed-loop boundary parameter under different simulated closed-loop states based on the closed-loop current constraint model;
and the loop closing management and control module is used for determining a management and control strategy of the safe loop closing according to the size of the loop closing boundary parameter and controlling the power grid loop closing operation based on the management and control strategy.
According to the loop closing control method and device for the alternating current-direct current hybrid operation power grid, the loop closing current constraint condition, the loop closing power constraint condition and the power flow equation of each node of the circuit where the target loop closing point is located are determined according to the obtained wiring diagram and the obtained circuit data of the power grid; taking a closed loop current constraint condition, a closed loop power constraint condition and a power flow equation as a closed loop current constraint model; determining the size of a closed loop boundary parameter under different simulated closed loop states based on a closed loop current constraint model; therefore, a control strategy of the safe loop closing is determined according to the size of the loop closing boundary parameter, and the power grid loop closing operation is controlled based on the control strategy. According to the loop closing control method and device for the alternating current-direct current hybrid operation power grid, the loop closing operation of the power grid is controlled based on the size of the loop closing boundary parameter determined by the loop closing current constraint model, and according to the size of the loop closing boundary parameter, the pressure difference on two sides of the loop point, the output power of the circuit where the loop closing point is located and the direct current output power can be adjusted and integrated to be smaller than the parameter value of the corresponding parameter in the loop closing boundary parameter, so that the starting probability of the circulating power and the power flow control strategy in the loop can be reduced, the power flow roundabout generated in the loop closing operation can be prevented, and the safety and the reliability of.
Drawings
FIG. 1 is a schematic diagram of the transmission power direction of a line in normal operation of a conventional AC/DC hybrid operation power grid;
FIG. 2 is a schematic diagram of the transmission power direction of a closed loop operation line of a conventional AC/DC hybrid operation power grid;
fig. 3 is a flowchart of a closed loop control method for an ac/dc hybrid operation power grid according to an embodiment of the present invention;
fig. 4 is a flowchart of a closed loop control method for an ac/dc hybrid operation power grid according to a second embodiment of the present invention;
fig. 5 is a schematic diagram of a line transmission power direction of a closed loop operation of an ac/dc hybrid operation power grid according to a second embodiment of the present invention;
fig. 6 is a schematic diagram of an equivalent circuit of a closed loop operation of an ac/dc hybrid operation power grid according to a second embodiment of the present invention;
fig. 7 is a schematic diagram of an optimal loop closing of an ac/dc hybrid operation power grid according to a second embodiment of the present invention;
fig. 8 is a block diagram of a loop closing control device for an ac/dc hybrid operation power grid according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic diagram of a transmission power direction of a line in normal operation of an existing alternating-current/direct-current hybrid operation power grid, where a line WJ, a line LJ, a line SH, a line JH1, and a line JH2 shown in fig. 1 are all alternating-current transmission lines, and a line DC1, a line DC2, and a line DC3 are all direct-current transmission lines. As shown in fig. 1, when the ac/dc hybrid operation power grid is in normal operation, switches 100, 500, and 600 (closing points) of the substation 1 are all in an open position, and the generated power of the wind farm 2 is transmitted through the ac line WJ and the dc channel of the converter station 2. The converter station 2 can control the active power output of the converter, so that all the residual active power of the wind power plant 2 after in-situ balance is transmitted through the direct current line, and the active power of the alternating current line WJ is close to zero. When the active power of the line WJ exceeds +/-5 MW due to the increase of the generated power of the wind power plant 2, the converter station 2 adjusts the conduction angle of the converter, increases the active power transmitted by the direct-current line, and reduces the active power transmitted by the line WJ (the active power of the line WJ is close to zero). Similarly, the converter station 1 may control the active power of the converter to be output to the line JH1, balance the active power of the wind farm 1 locally, and transmit all the remaining active power after the active power of the ac line LJ approaches zero through the dc line.
Fig. 2 is a schematic diagram of a line transmission power direction of a closed-loop operation of an existing ac/dc hybrid operation power grid, as shown in fig. 2, when a closed-loop point of a substation 1 is closed, for example, a 100 switch is closed, a connection between a wind farm 2 and the outside includes not only an ac line WJ and a dc channel of a converter station 2, but also an ac line LJ and a dc channel of a converter station 1. At this time, when the output of the wind power plants 1 and 2 is increased, power is continuously transmitted to the converter station 2, and the residual power is output from the line WJ and is increased by more than 5MW, in this way, the converter station 2 adjusts the conduction angle of the converter, and the active power transmitted by the direct current line (through the alternating current line SH of the converter station 3) is continuously increased until the converter stations 1 and 2 are fully loaded; meanwhile, as the tidal current flows in the converter station 3 → the transformer station 4 → the transformer station 5 → the transformer station 1, when the input power of the line LJ is increased and exceeds-5 MW, the converter station 1 adjusts the conduction angle of the converter, the power of the rest direct current channel is continuously injected into the I bus of the transformer station 1 through the JH1 source of the alternating current circuit, and flows to the line WJ and the line JH2 through the II bus to reenter the direct current channel, so that a tidal current roundabout is formed, equipment overload or tripping can be caused by the tidal current roundabout, and the safe operation of a power grid is seriously threatened.
Example one
Fig. 3 is a flowchart of a closed loop control method for an ac/dc hybrid operation power grid according to an embodiment of the present invention, where the present embodiment is applicable to aspects of closed loop operation control and the like for the ac/dc hybrid operation power grid, the method may be executed by a closed loop control device for the ac/dc hybrid operation power grid, the closed loop control device may be implemented by software and/or hardware, the closed loop control device may be integrated in an electronic device, such as a computer, having a closed loop control function for the ac/dc hybrid operation power grid, and the method specifically includes the following steps:
and step 110, acquiring a wiring diagram and line data of the power grid.
The wiring diagram of the power grid is shown in fig. 1 and fig. 2, and the line data may include a maximum transmission current of the line, a power threshold of the line connection transformer, a line overcurrent protection fixed value, and the like. The wiring diagram and the line data of the power grid can be stored in the power grid control system, and the loop closing control device of the alternating current-direct current hybrid operation power grid can acquire the wiring diagram and the line data in the power grid control system through an input interface which is arranged by the loop closing control device and electrically connected with the power grid control system so as to determine each constraint condition.
And step 120, determining a closed-loop current constraint condition, a closed-loop power constraint condition and a power flow equation of each node of the circuit where the target closed-loop point is located according to the wiring diagram and the circuit data of the power grid.
The loop closing transient current constraint condition may include a loop closing transient current constraint condition and a loop closing steady-state current constraint condition, and for example, the loop closing transient current constraint condition may be that a maximum current instantaneous value after a loop closing of a line where a target loop closing point is located does not exceed an overcurrent I-section protection fixed value of the line where the target loop closing point is located. As shown in fig. 2, the loop closing point is at 100 switches, and the 100 switches are closed to implement the loop closing operation, and the loop closing current constraint condition, that is, the maximum current instantaneous value of the line where the 100 switches are located, needs not to exceed the overcurrent I-section protection constant value of the line. The closed-loop power constraint condition can be a power threshold value of two ends of a transformer substation connected with a circuit where the target closed-loop point is located, and a power flow equation of each node of the circuit where the target closed-loop point is located can be determined according to a wiring diagram of a power grid and circuit data based on power flow calculation of a power system so as to establish a closed-loop current constraint model.
And step 130, taking the closed loop current constraint condition, the closed loop power constraint condition and the power flow equation as a closed loop current constraint model.
Specifically, the closed-loop current constraint model is a model formed by a power flow equation and a plurality of constraint conditions such as a closed-loop current constraint condition and a closed-loop power constraint condition, and determines the size of a closed-loop boundary parameter of the power grid in which the alternating current and direct current hybrid operation is performed in different simulated closed-loop states, such as the simulated closed-loop states corresponding to the closed-loop state of 100 switches, the closed-loop state of 500 switches or the closed-loop state of 600 switches in the circuit shown in fig. 1 and fig. 2, based on the closed-loop current constraint model.
And step 140, determining the size of the loop closing boundary parameter under different simulated loop closing states based on the loop closing current constraint model.
The closed-loop current constraint model comprises closed-loop boundary parameters, the closed-loop boundary parameters are in constraint conditions and a power flow equation, and the closed-loop boundary parameters can comprise pressure difference between two sides of a closed-loop point, impedance between two sides of the closed-loop point, output power of a circuit where the closed-loop point is connected with a power supply and the like. If the 100 switches in the circuit shown in fig. 2 are closed, at this time, the simulated loop closing state of the power grid is the simulated loop closing state corresponding to the 100 switches being closed, and the circuit parameters of the power grid operation in the simulated loop closing state are substituted into the loop closing current constraint model, so that the size of the loop closing boundary parameter can be obtained; if the 500 switches in the circuit shown in fig. 2 are closed, at this time, the simulated loop closing state of the power grid is the simulated loop closing state corresponding to the 500 switches being closed, and the circuit parameters of the power grid operation in the simulated loop closing state are substituted into the loop closing current constraint model, so that the size of the loop closing boundary parameter can be obtained; the sizes of the loop closing boundary parameters in different simulated loop closing states are different, so that the power grid loop closing operation is controlled according to the sizes of the loop closing boundary parameters in different simulated loop closing states.
And 150, determining a control strategy of the safe loop closing according to the size of the loop closing boundary parameter, and controlling the power grid loop closing operation based on the control strategy.
The management and control strategy of the security loop closing can include: adjusting the pressure difference on the two sides of the loop closing point to be smaller than the pressure difference in the loop closing boundary parameter, and determining that the switch at the loop closing point is closed; determining that the direct current output power of a circuit where a loop closing point is located and a power supply is smaller than the direct current power in the loop closing boundary parameter; before the loop closing operation, adjusting the pressure difference on two sides of the loop closing point to be smaller than the pressure difference in the loop closing boundary parameter; and adjusting the output of the fan connected with the wind power plant by the circuit with the loop closing point before the loop closing operation to be smaller than the output power of the fan in the loop closing boundary parameter.
Specifically, the pressure difference on two sides of the loop closing point, the output power of the circuit where the loop closing point is located and the direct current output power can be adjusted to be smaller than the parameter values of the corresponding parameters in the loop closing boundary parameter according to the parameter size of the loop closing boundary parameter, so that the starting probability of the circulating power in a loop and the power flow control strategy can be reduced, the power flow bypass caused by the loop closing operation can be prevented, and the safety and the reliability of the loop closing operation can be guaranteed.
According to the loop closing control method for the alternating current-direct current hybrid operation power grid, the loop closing operation of the power grid is controlled based on the size of the loop closing boundary parameter determined by the loop closing current constraint model, and according to the size of the loop closing boundary parameter, the pressure difference on two sides of the loop point, the output power of the circuit connecting power supply where the loop closing point is located and the direct current output power can be adjusted and integrated to be smaller than the parameter values of the corresponding parameters in the loop closing boundary parameter, so that the starting probability of the loop power and the power flow control strategy in a loop can be reduced, the power flow roundabout generated in the loop closing operation is prevented, and the.
Example two
Fig. 4 is a flowchart of a closed loop control method for an ac/dc hybrid operation power grid according to a second embodiment of the present invention, where this embodiment is applicable to aspects such as closed loop operation control of the ac/dc hybrid operation power grid, and the method may be executed by a closed loop control device for the ac/dc hybrid operation power grid, where the closed loop control device may be implemented in a software and/or hardware manner, and the closed loop control device may be integrated in an electronic device, such as a computer, having a closed loop control function for the ac/dc hybrid operation power grid, and the method specifically includes the following steps:
and step 210, acquiring a wiring diagram and line data of the power grid.
The wiring diagram of the power grid is shown in fig. 1 and fig. 2, and the line data may include a maximum transmission current of the line, a power threshold of the line connection transformer, a line overcurrent protection fixed value, and the like. The circuit closing management and control device of the alternating current-direct current hybrid operation power grid can acquire the circuit diagram and the circuit data in the power grid control system through an input interface which is arranged by the device and electrically connected with the power grid control system.
Step 220, according to the wiring diagram and the line data of the power grid, determining an overcurrent I section protection fixed value I of the line where the target loop closing point is locatedi over-current I。
Wherein, the overcurrent I section protects a constant value Ii over-current IThe specific value of (b) may be set according to actual conditions, and is not limited herein.
Step 230, adding IM≤Ii over-current IAs loop closing transient current constraint conditions.
Wherein, IMAnd i is a maximum current instantaneous value after the loop closing of the circuit where the target loop closing point is located, and i is a circuit node on two sides of the target loop closing point. Fig. 5 is a schematic diagram of a line transmission power direction of a closed loop operation of an ac/dc hybrid operation power grid according to a second embodiment of the present invention, where fig. 5 is based on fig. 2, where the wind farm 1 and the converter station 1 in fig. 2 are equivalent to a power source 1, the wind farm 2 is equivalent to a power source 2, and the converter station 2 is equivalent to a load 2The converter station 3 is equivalently obtained as a power supply 3. Fig. 6 is a schematic diagram of an equivalent circuit of an ac/dc hybrid operation power grid loop closing operation provided by a second embodiment of the present invention, and fig. 6 is an equivalent schematic diagram of fig. 5, and with reference to fig. 5 and fig. 6, an end of a loop closing point, i.e., a parent side I of a 100 switch, a parent side II of a 500 switch, or a 600 switch, is taken as a substation a, transmission power is Sa, power consumption of the side is S2, an end of a parent side II of the loop closing point is taken as a substation b, transmission power is Sb, and power consumption of the side is S3, where S0 continuously flows to a converter station 1, and the node is taken as a load. Because a power flow roundabout is formed after a power flow control strategy for power grid operation is started, the power of the power supply 2 is adjustable injection power Sw2, the power supply 1 and the power supply 3 continuously output power Sw1 and Sw3, and the power flow flows from the loop closing point I bus to the loop closing point II bus to obtain an equivalent diagram shown in fig. 6.
Specifically, the maximum current instantaneous value appears in about half cycle after the loop closing, and when the loop closing point is 500 switches or 600 switches, the overcurrent I-section protection constant values of two main transformer switches and a loop power grid switch of the loop are affected (the node 5-10 shown in fig. 6 is affected, the loop closing point is not affected by overcurrent protection, and when the loop closing point is 100 switches, the line switch on the 110kV loop is not affected by overcurrent protection), Ii over-current IFor the overcurrent I section protection constant value of each node switch of the loop, for ensuring that the impact current is less than the overcurrent I section constant value, the constraint conditions of the closed loop transient current are as follows:
Figure BDA0002809346900000111
wherein R, L are equivalent resistance and inductance of loop closing point, ImIn order to obtain the steady-state current amplitude of the loop closing operation,
Figure BDA0002809346900000112
step 240, according to the wiring diagram and the line data of the power grid, determining an overcurrent II-section protection fixed value I of the line where the target loop closing point is locatedi overcurrent II。
It should be noted that the overcurrent II section protects the constant value Ii overcurrent IIThe numerical value of (A) can be specified according to actual conditionsThe setting is not limited herein.
Step 250, adding Ii≤Ii overcurrent IIAs loop closing transient current constraint conditions.
Wherein, IiAnd i is a steady-state current after the loop closing of the circuit where the target loop closing point is located, and i is a circuit node on two sides of the target loop closing point. When the loop closing point is a 500 switch or a 600 switch, the steady-state current after loop closing is smaller than the overcurrent II-section protection constant value of each node switch on the loop (the same as the I-section protection principle, only influencing the main transformer and the distribution network switch), and the loop closing steady-state current constraint formula is as follows:
Figure BDA0002809346900000121
wherein S isi、Ui、IiPower, line voltage, line current are injected into the loop, respectively.
And step 260, determining power thresholds of two ends of the transformer substation connected with the line where the target loop closing point is located according to the wiring diagram and the line data of the power grid.
The specific numerical value of the power threshold values at the two ends of the transformer substation connected with the line where the target ring closing point is located can be set according to the actual situation, and is not limited herein.
And 270, taking power thresholds at two ends of the transformer substation as closed loop power constraint conditions.
Specifically, referring to fig. 5 and 6, the output power at the two ends of the loop closing point can be obtained according to the ring network power distribution rule
Figure BDA0002809346900000122
Figure BDA0002809346900000123
Comprises the following steps:
Figure BDA0002809346900000124
Figure BDA0002809346900000125
wherein Z is12、Z23、Z34Respectively the impedance between node 1 and node 2, the impedance between node 2 and node 3, and the impedance between node 3 and node 4,
Figure BDA0002809346900000126
for circulating power, ∑ Z*＝(Z12+Z23+Z34) Is the loop impedance phasor sum. When the loop point is adjusted to 100/500/600 switches, Z23In a growing change, UNIs the bus voltage on the two sides of the loop closing point,
Figure BDA0002809346900000127
the tidal current flow direction is determined by the voltage component difference of the two sides of the loop closing point. The starting condition of the power flow control strategy of the power grid operation is that the power of two alternating current ends of the transformer substation 1 does not exceed +/-5 MW according to
Figure BDA0002809346900000128
Figure BDA0002809346900000129
Representing the complex power
Figure BDA00028093469000001211
Taking a real part P, the closed loop power constraint condition is as follows:
Figure BDA00028093469000001210
or
Figure BDA0002809346900000131
It should be noted that the power ± 5MW is only an exemplary illustration, and the specific power value can be set according to the actual situation, and is not limited herein.
And step 280, determining a power flow equation of each node of the line where the target loop closing point is located according to the wiring diagram and the line data of the power grid.
Specifically, the power flow equation is expressed by a PQ decomposition method of the voltage of each node of the circuit where the target loop closing point is located, and the power flow equation of the PQ decomposition method is as follows:
Figure BDA0002809346900000132
where, -B' is a modified susceptance matrix without parallel branches, and θ and V are the phase and amplitude of the voltage, respectively.
And 290, taking the closed loop current constraint condition, the closed loop power constraint condition and the power flow equation as a closed loop current constraint model.
Specifically, according to the above constraint conditions and the expression of the power flow equation, the closed-loop current constraint model can be expressed as:
Figure BDA0002809346900000133
wherein,
Figure BDA0002809346900000134
Figure BDA0002809346900000135
Figure BDA0002809346900000141
UNin practice, the change is small, and the target value is influenced a little, and can be regarded as a fixed quantity.
Figure BDA0002809346900000142
Is the independent variable of the number of the variable,
Figure BDA0002809346900000143
Z23is changed by changing the loop closing point switch,
Figure BDA0002809346900000144
the output power is adjusted by the power supplies 1, 2 to change,
Figure BDA0002809346900000145
is changed by adjusting the voltage phase difference of two sides of the loop closing point,
Figure BDA0002809346900000146
is a dependent variable.
And 291, when the power grid simulates closed-loop operation, acquiring the impedance of the side of the transformer substation connected with the circuit where the closed-loop point is located in each simulated closed-loop state, the power output to the power load branch by the transformer substation and the bus voltage on the two sides of the closed-loop point.
Specifically, when the power grid simulation loop closing operation is performed, such as the 500 switch is closed or the 600 switch is closed, the parameter Z in the loop closing current constraint model in the loop closing state is simulated12、Z34、
Figure BDA0002809346900000147
UNEach corresponds to a specific numerical value. The simulation loop closing operation can be performed in a simulation loop closing operation system, and when the simulation loop closing is performed on the alternating current-direct current hybrid operation power grid, the simulation loop closing operation system can store the parameter Z12、Z34、
Figure BDA0002809346900000148
UNThe closed loop control device of the AC/DC hybrid operation power grid can acquire the parameter Z through the input interface which is arranged by the closed loop control device and electrically connected with the simulation closed loop operation system12、Z34、
Figure BDA0002809346900000149
UNTo determine the size of the loop boundary parameter.
And 292, substituting the impedance at the side of the transformer substation, the power output to the power load branch circuit by the transformer substation and the bus voltage at two sides of the loop closing point into the loop closing current constraint model to obtain the size of the loop closing boundary parameter.
Wherein the closed loop boundary parameter is the above independent variable Z23、
Figure BDA00028093469000001410
Will be the parameter Z12、Z34、
Figure BDA00028093469000001411
UNSubstituting the numerical value into a closed loop current constraint model to obtain a closed loop boundary parameter Z23、
Figure BDA00028093469000001412
According to the size of the closed-loop boundary parameter, the power grid closed-loop operation is controlled.
And 293, adjusting the pressure difference at two sides of the loop closing point, the output power of the circuit where the loop closing point is located and the direct current output power to be smaller than the parameter values of the corresponding parameters in the loop closing boundary parameter according to the parameter size of the loop closing boundary parameter.
Specifically, through the loop closing boundary parameter, a safety loop closing management and control strategy can be obtained:
(1) and adjusting the pressure difference (not exceeding the boundary parameter value) between two sides of the loop closing point, and determining to close a certain switch loop closing operation, wherein the power flow control strategy cannot be started, and the loop closing operation is safe.
(2) And controlling the direct current output power (not exceeding the boundary parameter value), and controlling the pressure difference (not exceeding the boundary parameter value) between two ends of the loop closing point, wherein the power flow control strategy cannot be started at the moment, and the loop closing operation performed by closing a certain switch is safe.
(3) Before the loop closing operation, the pressure difference between two sides of the loop closing point is regulated (the pressure difference does not exceed the boundary parameter value), and when the pressure difference limit value is reached, the circulating power in the loop is favorably reduced, particularly under the condition that the sum of the fan output (exceeds the boundary parameter value).
(4) The output of fans of the wind power plants 1 and 2 can be adjusted and reduced (the output does not exceed the boundary parameter value) before closing the loop, and the starting probability of a power flow control strategy and the circulating power in a closed loop can be reduced.
(5) The high-voltage side loop closing (i.e. the loop closing point 100 switch loop closing) does not cause line tripping, but the power flow roundabout causes the increase of transmission line loss, and if the distribution network side can safely close the loop, the loop closing operation by the high-voltage side switch is not recommended in terms of benefits.
Fig. 7 is a schematic diagram of an optimal loop closing operation for an ac/dc hybrid operation power grid according to a second embodiment of the present invention, where fig. 7 is obtained by performing a simulated loop closing operation based on the equivalent circuit of fig. 6, and when a parameter Z is obtained23、Ua-UbWhen the sum of the ac output power of the converter station 3 and the output power of the wind farm 1, 2 is shaded in fig. 7, the corresponding loop closing operation is the optimal loop closing operation, U shown in fig. 7a-UbFor the pressure difference between two ends of the loop closing point, the specific loop closing operation is controlled as follows:
(1) when the voltage difference between two sides of the loop closing point is less than or equal to U and less than or equal to-0.7 kV under the normal operation state of the AC/DC hybrid operation power grida-UbWhen the voltage is less than or equal to 0.4kV, the 600 switches are closed to carry out loop closing operation in any mode, the power flow control strategy of the alternating current-direct current hybrid operation power grid cannot be started, and the loop closing operation is safe.
(2) Controlling the AC output power of the converter station 3 to be less than or equal to 60MW, and controlling the pressure difference between two ends of a loop closing point to be less than or equal to U and less than or equal to-0.7 kVa-UbAnd when the voltage is less than or equal to 0.3kV, the power flow control strategy is not started, and the 600 switch or the 500 switch is closed to carry out loop closing operation safely.
(3) Before the ring closing operation, the pressure difference between two ends of the ring closing point is regulated when U isaLess than UbWhen the fan is used, the circulating power in the loop is favorably reduced, particularly the condition that the sum of the fan output exceeds 80 MW.
(4) The output of the fans of the wind power plants 1 and 2 can be adjusted to be respectively not more than 38.6MW and 41.44MW before the loop closing, so that the starting probability of the power flow control strategy and the circulating power in a closed loop can be reduced.
(5) The closing of the loop by the 100-switch closing point does not cause line tripping, but the power flow detours to increase the loss of the transmission line, and if the 10kV side can be closed safely, the 100-switch closing operation is not recommended in terms of benefit.
It should be noted that the pressure difference U between the two ends of the ring closing pointa-UbThe specific numerical value ranges of the converter station 3 ac output power and the wind turbine output of the wind power plants 1 and 2 may be set according to actual conditions, and are not limited herein.
According to the loop closing control method for the alternating current-direct current hybrid operation power grid, when the power grid simulates loop closing operation, the obtained impedance of the side of the transformer substation, the power output from the transformer substation to the power load branch and the voltage of the bus at the two sides of the loop closing point are substituted into the loop closing current constraint model to obtain the size of the loop closing boundary parameter, the loop closing operation of the power grid is controlled based on the size of the loop closing boundary parameter determined by the loop closing current constraint model, according to the size of the loop closing boundary parameter, the pressure difference at the two sides of the loop closing point, the output power of the line connecting power supply where the loop closing point is located and the direct current output power are all smaller than the parameter values of the corresponding parameters in the loop closing boundary parameter, the starting probability of the circulating power and the power flow control strategy in the loop is favorably reduced.
EXAMPLE III
Fig. 8 is a structural block diagram of a closed loop control device for an ac/dc hybrid operation power grid according to a third embodiment of the present invention, where the closed loop control device includes a data obtaining module 310, a constraint condition determining module 320, a constraint model determining module 330, a boundary parameter determining module 340, and a closed loop control module 350; the data acquisition module 310 is configured to acquire a wiring diagram and line data of a power grid; the constraint condition determining module 320 is configured to determine a closed-loop current constraint condition, a closed-loop power constraint condition, and a power flow equation of each node of a line where a target closed-loop point is located according to a wiring diagram of a power grid and line data; the constraint model determining module 330 is configured to use the closed-loop current constraint condition, the closed-loop power constraint condition, and the power flow equation as a closed-loop current constraint model; the boundary parameter determining module 340 is configured to determine the size of the closed-loop boundary parameter in different simulated closed-loop states based on the closed-loop current constraint model; the loop closing management and control module 350 is configured to determine a management and control policy for secure loop closing according to the size of the loop closing boundary parameter, and control the power grid loop closing operation based on the management and control policy.
On the basis of the above embodiment, the constraint condition determining module 320 includes an overcurrent I-stage protection fixed value determining unit and a closed loop transient current constraint condition determining unit; wherein, the overcurrent I section protection fixed value determining unit is used for connecting according to the power gridLine graph and line data, determining overcurrent I section protection constant value I of the line where the target loop closing point is positionedi over-current I(ii) a The closed loop transient current constraint determining unit is used for determining IM≤Ii over-current IAs loop closing transient current constraint conditions; wherein, IMAnd i is a maximum current instantaneous value after the loop closing of the circuit where the target loop closing point is located, and i is a circuit node on two sides of the target loop closing point.
Preferably, the constraint condition determining module 320 includes an overcurrent ii-stage protection fixed value determining unit and a closed loop transient current constraint condition determining unit; the overcurrent II-section protection constant value determining unit is used for determining an overcurrent II-section protection constant value I of the line where the target loop closing point is located according to the wiring diagram and the line data of the power gridi overcurrent II(ii) a The closed loop transient current constraint determining unit is used for determining Ii≤Ii overcurrent IIAs loop closing transient current constraint conditions; wherein, IiAnd i is a steady-state current after the loop closing of the circuit where the target loop closing point is located, and i is a circuit node on two sides of the target loop closing point.
In one embodiment, the constraint condition determining module 320 includes a two-terminal power threshold determining unit and a closed loop power constraint determining unit; the power threshold value determining unit at the two ends of the transformer substation determines the power threshold values at the two ends of the transformer substation connected with the line where the target loop closing point is located according to a wiring diagram and line data of a power grid; and the closed loop power constraint condition determining unit is used for taking power thresholds at two ends of the transformer substation as closed loop power constraint conditions.
Preferably, the boundary parameter determining module 340 includes a data obtaining unit and a loop closing boundary parameter determining unit; the data acquisition unit is used for acquiring impedance of a transformer substation side connected with a circuit where a loop closing point is located in each simulated loop closing state, power output by the transformer substation to an electricity load branch and bus voltage on two sides of the loop closing point when a power grid simulates loop closing operation; and the loop closing boundary parameter determining unit is used for substituting the impedance at the side of the transformer station, the power output to the power load branch circuit by the transformer station and the bus voltage at the two sides of the loop closing point into the loop closing current constraint model to obtain the size of the loop closing boundary parameter.
Preferably, the loop closing control module 350 includes a loop closing control unit, and the loop closing control unit is configured to adjust a pressure difference between two sides of the loop closing point, an output power of a line to which the loop closing point is connected, and a dc output power of the line to which the loop closing point is located, according to a parameter of the loop closing boundary parameter, where the dc output power is smaller than a parameter value of a corresponding parameter of the loop closing boundary parameter.
Preferably, the management and control strategy of the security loop comprises: adjusting the pressure difference on the two sides of the loop closing point to be smaller than the pressure difference in the loop closing boundary parameter, and determining that the switch at the loop closing point is closed; determining that the direct current output power of a circuit where a loop closing point is located and a power supply is smaller than the direct current power in the loop closing boundary parameter; before the loop closing operation, adjusting the pressure difference on two sides of the loop closing point to be smaller than the pressure difference in the loop closing boundary parameter; and adjusting the output of the fan connected with the wind power plant by the circuit with the loop closing point before the loop closing operation to be smaller than the output power of the fan in the loop closing boundary parameter.
Preferably, the power flow equation is expressed by a PQ decomposition method of the voltage of each node of the line where the target loop-closing point is located, and the power flow equation of the PQ decomposition method is as follows:
Figure BDA0002809346900000181
where, -B' is a modified susceptance matrix without parallel branches, and θ and V are the phase and amplitude of the voltage, respectively.
Preferably, the loop closing boundary parameter includes a voltage difference between two sides of the loop closing point, an impedance between two sides of the loop closing point, and an output power of a circuit where the loop closing point is connected to the power supply.
The loop closing control device for the alternating current and direct current hybrid operation power grid provided by the embodiment and the loop closing control method for the alternating current and direct current hybrid operation power grid provided by any embodiment of the invention belong to the same inventive concept, and have corresponding beneficial effects, and detailed technical details in the embodiment are not shown in the loop closing control method for the alternating current and direct current hybrid operation power grid provided by any embodiment of the invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A closed loop control method for an alternating current-direct current hybrid operation power grid is characterized by comprising the following steps:
acquiring a wiring diagram and line data of a power grid;
determining a closed loop current constraint condition, a closed loop power constraint condition and a power flow equation of each node of a circuit where a target closed loop point is located according to the wiring diagram and the circuit data of the power grid;
taking the closed loop current constraint condition, the closed loop power constraint condition and the power flow equation as a closed loop current constraint model;
determining the size of a closed loop boundary parameter under different simulated closed loop states based on the closed loop current constraint model;
and determining a control strategy of the safe loop closing according to the size of the loop closing boundary parameter, and controlling the power grid loop closing operation based on the control strategy.
2. The method for managing and controlling the closed loop of the alternating current-direct current hybrid operation power grid according to claim 1, wherein the determining the closed loop current constraint condition according to the wiring diagram and the line data of the power grid comprises:
determining an overcurrent I-section protection fixed value I of the line where the target loop closing point is located according to the wiring diagram and the line data of the power gridi over-current I；
Will IM≤Ii over-current IAs loop closing transient current constraint conditions; wherein, IMAnd i is a maximum current instantaneous value after the loop closing of the circuit where the target loop closing point is located, and i is a circuit node on two sides of the target loop closing point.
3. The method for managing and controlling the closed loop of the alternating current-direct current hybrid operation power grid according to claim 1, wherein the determining the closed loop current constraint condition according to the wiring diagram and the line data of the power grid comprises:
determining an overcurrent II-section protection fixed value I of the line where the target loop closing point is located according to the wiring diagram and the line data of the power gridi overcurrent II；
Will Ii≤Ii overcurrent IIAs loop closing transient current constraint conditions; wherein, IiAnd i is a steady-state current after the loop closing of the circuit where the target loop closing point is located, and i is a circuit node on two sides of the target loop closing point.
4. The method for managing and controlling the closed loop of the alternating current-direct current hybrid operation power grid according to claim 1, wherein the determining the closed loop power constraint condition according to the wiring diagram and the line data of the power grid comprises:
determining power thresholds of two ends of a transformer substation connected with a line where a target loop closing point is located according to the wiring diagram and the line data of the power grid;
and taking the power threshold values at the two ends of the transformer substation as closed loop power constraint conditions.
5. The method for managing and controlling the closed loop of the alternating current-direct current hybrid operation power grid according to claim 1, wherein the determining the size of the closed loop boundary parameter in different simulated closed loop states based on the closed loop current constraint model comprises:
when the power grid simulates closed-loop operation, acquiring impedance of a transformer substation side connected with a circuit where a closed-loop point is located in each simulated closed-loop state, power output to an electricity load branch circuit by the transformer substation and bus voltage on two sides of the closed-loop point;
and substituting the impedance at the side of the transformer substation, the power output to the power load branch circuit by the transformer substation and the bus voltage at two sides of the loop closing point into the loop closing current constraint model to obtain the size of the loop closing boundary parameter.
6. The method for managing and controlling the loop closing of the alternating current-direct current hybrid operation power grid according to claim 1, wherein the step of determining a management and control strategy for the safe loop closing according to the parameter size of the loop closing boundary parameter and controlling the loop closing operation of the power grid based on the management and control strategy comprises the steps of:
and adjusting the pressure difference on two sides of the loop closing point, the output power of a circuit connected with a power supply at the loop closing point and the direct current output power to be smaller than the parameter values of the corresponding parameters in the loop closing boundary parameters according to the parameter size of the loop closing boundary parameters.
7. The method for managing and controlling the loop closing of the alternating current-direct current hybrid operation power grid according to claim 1, wherein the management strategy for the safe loop closing comprises: adjusting the pressure difference on the two sides of the loop closing point to be smaller than the pressure difference in the loop closing boundary parameter, and determining that the switch at the loop closing point is closed; determining that the direct current output power of a circuit where a loop closing point is located and a power supply is smaller than the direct current power in the loop closing boundary parameter; before the loop closing operation, adjusting the pressure difference between two sides of the loop closing point to be smaller than the pressure difference in the loop closing boundary parameter; and adjusting the output of a fan of a wind power plant connected with a circuit where the loop closing point is located before the loop closing operation to be smaller than the output power of the fan in the loop closing boundary parameter.
8. The method for loop closing management and control of the alternating current-direct current hybrid operation power grid according to claim 1, wherein the power flow equation is expressed by a PQ decomposition method of voltages of nodes of a line where a target loop closing point is located, and the power flow equation of the PQ decomposition method is as follows:
Figure FDA0002809346890000031
where, -B' is a modified susceptance matrix without parallel branches, and θ and V are the phase and amplitude of the voltage, respectively.
9. The method for managing and controlling the loop closing of the alternating current-direct current hybrid operation power grid according to claim 1, wherein the loop closing boundary parameters comprise a voltage difference between two sides of the loop closing point, impedance between two sides of the loop closing point, and output power of a line where the loop closing point is connected with a power supply.
10. The utility model provides a closed loop management and control device of alternating current-direct current hybrid operation electric wire netting which characterized in that includes:
the data acquisition module is used for acquiring a wiring diagram and line data of a power grid;
the constraint condition determining module is used for determining a closed loop current constraint condition, a closed loop power constraint condition and a power flow equation of each node of a circuit where a target closed loop point is located according to the wiring diagram and the circuit data of the power grid;
the constraint model determining module is used for taking the closed loop current constraint condition, the closed loop power constraint condition and the power flow equation as a closed loop current constraint model;
the boundary parameter determining module is used for determining the size of the closed-loop boundary parameter under different simulated closed-loop states based on the closed-loop current constraint model;
and the loop closing management and control module is used for determining a management and control strategy of the safe loop closing according to the size of the loop closing boundary parameter and controlling the power grid loop closing operation based on the management and control strategy.
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