CN110571814A - energy control circuit and method based on resistance-capacitance device - Google Patents
energy control circuit and method based on resistance-capacitance device Download PDFInfo
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- CN110571814A CN110571814A CN201910700375.1A CN201910700375A CN110571814A CN 110571814 A CN110571814 A CN 110571814A CN 201910700375 A CN201910700375 A CN 201910700375A CN 110571814 A CN110571814 A CN 110571814A
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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
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- 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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- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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- Direct Current Feeding And Distribution (AREA)
Abstract
an energy control circuit and method based on a capacitance-resistance device comprises the following steps: the circuit is connected with a direct current transmission line after being connected with a receiving end converter station in parallel, and the circuit comprises: the system comprises a main resistor and a plurality of energy control modules; the main resistor and the energy control modules are sequentially connected in series; the main resistor is used for providing main power consumed by the energy control circuit; the energy control module is used for circuit voltage division. The scheme can directly control the connection or the disconnection of the energy control module in the energy control circuit to control the energy consumption of the direct current line, and the control process is simple; in addition, the connection or the disconnection of the energy control module can be controlled to realize the voltage division treatment of the direct current line under the condition that the direct current line is high voltage, so that the problem that the electric elements of the energy control circuit are damaged due to overhigh voltage is solved. The simple control method realizes the voltage regulation and voltage division effects of the energy control circuit and saves the occupied space of the circuit.
Description
Technical Field
the invention relates to the field of direct-current transmission energy transfer, in particular to an energy control circuit and method based on a resistance-capacitance device.
background
the direct-current transmission line can efficiently and conveniently transmit a large amount of electric energy from an energy base to a load center, the structure diagram of the direct-current transmission line is shown in fig. 2, for a direct-current transmission project in operation, the electric energy consumed by a receiving end is balanced with the electric energy transmitted by a transmitting end, and the voltage and the working frequency of a power grid of the transmitting end are kept constant. When the receiving end power system is disturbed or fails and cannot absorb the electric energy sent by the sending end, the voltage and the frequency of the power grid of the sending end are disturbed, and the disturbance can be reduced by quickly adjusting the output of the generator; if the power supply at the sending end is a thermal power generator or a hydroelectric generator, the output of the generator can be adjusted, but a certain time delay is needed in the adjusting process, instant response cannot be realized, and the voltage and the frequency of a power grid still generate disturbance; if the power supply at the sending end is a wind generating set, the wind power in the nature cannot be controlled, the output of the wind generating set cannot be adjusted according to the operation requirement, the voltage and the frequency of a power grid at the sending end are seriously disturbed, and the power generating set can be cracked when the voltage and the frequency are serious, so that serious power grid accidents are caused.
the development of the ultra-high voltage direct current transmission technology enables the transmission capacity of direct current transmission to be increased to 8000-12000 MW, the traditional firepower of a transmission end power grid and the installed capacity of a hydroelectric generator rise with the water, the output of the generator is difficult to adjust rapidly, and the difficulty is aggravated by bundling and delivering wind, light, water and thermal power; the development of the flexible direct-current transmission technology enables the grid-connected scale of wind power generation to be enlarged day by day, and the risk that the power of a transmitting end and the power of a receiving end are not matched due to the fault of a receiving end power grid is increased day by day, so that the wind generating set is cracked.
In order to solve the above problems and improve the operation reliability of the dc transmission, an energy control circuit needs to be designed to maintain the power balance of the transmitting and receiving ends of the whole dc transmission system.
There are three types of energy control circuits. The circuit 1 is in a type that a switch and a resistor are connected in series, as shown in fig. 3, the switch is a valve formed by connecting power electronic devices in series, the adjustment of the consumed power of the resistor is realized by controlling the opening and closing of the valve in a Pulse Width Modulation (PWM) mode, and the circuit has the characteristics of simple structure and easy control; however, when the dc voltage rises to a certain degree, the increase of the number of the power electronic devices makes the voltage equalizing of the devices difficult, and the action consistency of all the power electronic devices cannot be ensured due to the adoption of the pulse width modulation mode; therefore, the control circuit is suitable for the low-voltage field. The circuit 2 is modularly designed on the basis of the circuit 1, and as shown in fig. 4, the control method is as follows: the switches and the resistors are distributed in each module, voltage equalization of the modules is realized by module capacitors, and the power consumed by the circuit is controlled by controlling the number of the conducted module switches; the circuit has the advantages of simple control mode and no limitation of direct-current voltage, and has the defects that the resistor consuming energy is arranged in the module, the module volume and the valve hall building area are increased, and the requirement on a cooling system is high. Compared with the circuit 1, the circuit 3 has the improvement that the switching valves adopt Modular Multilevel Converter (MMC) modules which are connected in series, as shown in figure 5, the modular multilevel converter modules can adopt a full-bridge or half-bridge structure, the control method can realize module voltage sharing through charging and discharging of modular multilevel converter module capacitors, and when the control circuit acts, the modular multilevel converter modules do not need to be switched simultaneously, so that the circuit is not limited by direct-current voltage and can be applied to high-voltage engineering; the control method of the circuit has the disadvantages of complex control mode and high equipment cost.
disclosure of Invention
in order to solve the problem that an energy control method suitable for a high-voltage direct-current line is lacked in the prior art, the invention provides an energy control circuit and method based on a resistance-capacitance device.
the technical scheme provided by the invention is as follows:
an energy control circuit based on a resistance-capacitance device is connected to a direct current transmission line after being connected with a receiving end converter station in parallel, and the circuit comprises:
The system comprises a main resistor and a plurality of energy control modules;
The main resistor and the energy control modules are sequentially connected in series;
the main resistor is used for providing main power consumed by the energy control circuit;
the energy control module is used for circuit voltage division.
preferably, the circuit is connected to the DC power line in an asymmetric or symmetric manner.
preferably, the resistance value of the main resistor is determined by a preset maximum power consumption value of the circuit and the voltage of the direct current transmission line, and the resistance value of the main resistor is calculated according to the following formula:
Wherein R ism_usyis the resistance value of the main resistor, PmaxFor a predetermined maximum value of the power consumption, U, of the circuitdcAnd the voltage of the direct current transmission line.
preferably, the energy control module includes:
The circuit comprises a main switch, a capacitor, an auxiliary switch and an auxiliary resistor;
The auxiliary switch is connected with the auxiliary resistor in series to form an auxiliary loop;
The main switch, the capacitor and the auxiliary loop are connected in parallel, and the initial state of the auxiliary switch is set to be a closed state;
the energy control module includes three operating states:
Short-circuit state: when the main switch is closed, the energy control module is in short circuit, and the capacitor does not divide voltage;
partial pressure state: the main switch and the auxiliary switch are disconnected, and the capacitor is connected in series in the circuit to divide voltage;
and (4) protection state: the main switch is switched off and the auxiliary switch is switched on, at the moment, the auxiliary resistor and the capacitor form a loop, and the capacitor discharges and reduces voltage.
Preferably, the minimum number of energy control modules arranged in the circuit is determined by the voltage withstanding capability of the main switch and the voltage of the dc transmission line, and the calculation formula is as follows:
wherein N ism_min_usyminimum number of energy control modules, N, in an asymmetrical arrangementm_min_sywhen symmetrically arranged, the minimum number of energy control modules, UdcIs the voltage of the DC transmission line, Um_eis the voltage withstanding capability of the main switch.
preferably, the number of energy control modules required to be put into use in the circuit is determined by the maximum power of the direct current transmission line and the energy consumption requirement of the control circuit, and the calculation formula is as follows:
wherein N ison_usywhen the setting is asymmetric, the input quantity of the energy control module is Non_sywhen symmetrically arranged, the energy controls the input of the module, Udcis a DC line voltage, Um_ethe duty is the maximum withstand voltage of the main switch, the duty is the energy consumption requirement, and the duty is more than or equal to 0 and less than or equal to 1.
Preferably, the main switch and the auxiliary switch are power electronic devices with controllable on and controllable off.
Preferably, the energy control module further includes: a first diode, a second diode, and a third diode;
the first diode is connected with the main switch in series after being connected with the main switch in reverse parallel;
The third diode is connected in parallel in reverse with the auxiliary switch.
Preferably, when the circuit is connected to the dc power transmission line in an asymmetric manner, the main resistor is connected to a negative terminal of the dc power transmission line, and the inductor is connected to a positive terminal of the dc power transmission line;
when the circuits are symmetrically connected in parallel to the direct current circuit, the main resistors of the two circuits are connected and then grounded, and two ends of the circuits are connected in parallel to the positive end and the negative end of the direct current transmission line.
Preferably, the method further comprises the following steps: an inductance;
The inductor is connected in series with the energy control module;
the minimum value of the inductance is determined by the voltage of the direct current transmission line and the opening current tolerance of the main switch.
Preferably, the main resistors in the circuit are arranged outside the centralized chamber, and the plurality of energy control modules are arranged in the valve hall.
preferably, the energy control module includes:
The device comprises a main switch, a battery, an auxiliary switch, an auxiliary resistor and a diode;
the auxiliary switch is connected with the diode in parallel in the reverse direction and then connected with the auxiliary resistor in series to form an auxiliary loop;
The main switch, the battery and the auxiliary loop are connected in parallel, and the initial state of the auxiliary switch is set to be a closed state;
The energy control module includes three operating states:
Short-circuit state: when the main switch is closed, the energy control module is in short circuit, and the battery does not divide voltage;
partial pressure state: the main switch and the auxiliary switch are disconnected, and the battery is connected in series in the circuit to carry out voltage division;
and (4) protection state: the main switch is switched off and the auxiliary switch is switched on, at the moment, the auxiliary resistor and the battery form a loop, and the battery discharges and reduces voltage.
Preferably, the energy control module includes:
The circuit comprises a main switch, a first capacitor, a second capacitor, a first auxiliary switch, a second auxiliary switch and an auxiliary resistor;
The first capacitor is connected with the second capacitor in series to form a first series circuit;
the first auxiliary switch is connected with the second auxiliary switch in series to form a second series circuit;
The first series circuit and the second series circuit are connected with the main switch in parallel, and the central point of the first series circuit is connected with the central point of the second series circuit through the auxiliary resistor;
The energy control module includes three operating states:
short-circuit state: when the main switch is closed, the energy control module is in short circuit, and the first capacitor and the second capacitor do not divide voltage;
Partial pressure state: the main switch, the first auxiliary switch and the second auxiliary switch are switched off, and at the moment, the first capacitor and the second capacitor are connected in series in the circuit for voltage division;
and (4) protection state: the main switch is switched off, the first auxiliary switch and the second auxiliary switch are switched on, at the moment, the auxiliary resistor and the first capacitor and the second capacitor respectively form a loop, and the first capacitor and the second capacitor discharge and step down.
preferably, the energy control module further includes:
two diodes;
The two diodes are respectively connected in parallel with the first auxiliary switch and the second auxiliary switch.
Preferably, the energy control module includes:
the circuit comprises a main switch, a capacitor, four auxiliary switches and an auxiliary resistor;
The auxiliary switches are connected in series in pairs to obtain two series circuits, and the two series circuits, the capacitor and the main switch are connected in parallel;
The central points of the two series circuits are connected through the auxiliary resistor;
The energy control module includes three operating states:
short-circuit state: when the main switch is closed, the energy control module is in short circuit, and the capacitor does not divide voltage;
partial pressure state: the main switch and all the auxiliary switches are disconnected, and at the moment, the capacitor is connected in series in the circuit for voltage division;
And (4) protection state: the main switch is switched off, all the auxiliary switches are switched on, at the moment, the auxiliary resistor and the capacitor form a loop, and the capacitor discharges and reduces voltage.
preferably, the energy control module further includes:
four diodes;
The diodes are respectively connected in parallel in the reverse direction on the auxiliary switch.
A control method of the energy control circuit, comprising:
determining the input amount of the energy control module according to the energy consumption requirement;
adjusting energy control modules needing to be put into a voltage division state according to the input quantity, and adjusting the rest energy control modules into a short-circuit state;
and tracking the state of the energy control module and keeping the voltage division stable.
Preferably, the adjusting the energy control module to be charged into a partial pressure state according to the charged amount includes:
determining an energy control module required to be input according to the input amount;
And disconnecting a main switch and an auxiliary switch in the energy control module to be input, and connecting the capacitor in series in the circuit for voltage division.
preferably, the tracking the state of the energy control module to keep the voltage division stable includes:
Acquiring the voltage at two ends of the capacitor in real time, closing the auxiliary switch when the voltage at two ends of the capacitor is increased to a first threshold value, forming a closed loop by the capacitor and the auxiliary resistor at the moment, and discharging and reducing the voltage of the capacitor;
when the voltage at the two ends of the capacitor is reduced to a second threshold value, the auxiliary switch is switched off, and the capacitor is connected in series in the circuit for voltage division;
wherein the first threshold is greater than a second threshold.
Preferably, the determining the input amount of the energy control module according to the energy consumption requirement includes:
determining the input amount of the energy control module based on the energy consumption demand and the partial pressure amount of the capacitor, as shown in the following formula:
wherein N ison_usywhen the setting is asymmetric, the input quantity of the energy control module is Non_sywhen symmetrically arranged, the energy controls the input of the module, UdcIs a DC line voltage, Umothe duty is the energy consumption requirement, and is more than or equal to 0 and less than or equal to 1.
compared with the prior art, the invention has the beneficial effects that:
the technical scheme provided by the invention is an energy control circuit and method, wherein the circuit is connected with a receiving end converter station in parallel and then is connected with a direct current transmission line, and the circuit comprises: the system comprises a main resistor and a plurality of energy control modules; the main resistor and the energy control modules are sequentially connected in series; the main resistor is used for providing main power consumed by the energy control circuit; the energy control module is used for circuit voltage division. The energy control circuit provided in the scheme comprises an energy control module, and when the direct current system normally operates or is disturbed or fails, the energy control module can control the energy consumption power in the circuit, so that whether the whole circuit is put into an operating state or not is controlled, and the balanced operation of the whole direct current transmission system is maintained.
the scheme can directly control the connection or the disconnection of the energy control module in the energy control circuit to control the energy consumption of the direct current line, and the control process is simple; and the voltage of the direct current line can be divided under the condition that the direct current line is high voltage by controlling the connection or the disconnection of the energy control module, so that the problem that the electric elements of the energy control circuit are damaged due to overhigh voltage is solved.
the energy control module in the scheme only comprises the main switch, the auxiliary switch, the main resistor, the auxiliary resistor, the capacitor and the diode, the cost is low, the circuit connection is simple, and the occupied area is small.
In the circuit that this scheme provided, the auxiliary resistor mountable is indoor, and the main resistance can take the outdoor concentrated arrangement, through natural cold wind cooling, has saved the refrigeration cost.
drawings
FIG. 1 is a block diagram of an energy control circuit based on a capacitance resistance device of the present invention;
fig. 2 is a diagram of a dc transmission line in the prior art;
FIG. 3 is a diagram of a prior art circuit 1;
FIG. 4 is a diagram of a prior art circuit 2;
FIG. 5 is a diagram of a prior art circuit 3;
FIG. 6 is a symmetrical connection diagram of the energy control circuit of the present invention;
FIG. 7 is a first topology block diagram of the energy control module of the present invention;
FIG. 8 is a diagram of a second topology of the energy control module of the present invention;
FIG. 9 is a third topology block diagram of the energy control module of the present invention;
FIG. 10 is a fourth topology block diagram of the energy control module of the present invention;
1-converter transformer; 2-a current converter; 3-an alternating current filter; 4-smoothing reactor; 5-a direct current filter; 6-cooling system outside the converter station.
Detailed Description
For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.
example 1:
The embodiment provides an energy control circuit based on a resistance-capacitance device, a circuit structure of which is shown in fig. 1, the circuit is connected to a direct current transmission line after being connected in parallel with a receiving end converter station, and the circuit includes:
The system comprises a main resistor and a plurality of energy control modules;
The main resistor and the energy control modules are sequentially connected in series;
the main resistor is used for providing main power consumed by the energy control circuit;
The energy control module is used for circuit voltage division.
The circuit is connected to the DC power line in an asymmetric or symmetric way, and the symmetric connection diagram is shown in figure 6.
The resistance value of the main resistor is determined by the preset maximum power consumption value of the circuit and the voltage of the direct current transmission line, and the resistance value of the main resistor is calculated according to the following formula:
wherein R ism_usyIs the resistance value of the main resistor, Pmaxfor a predetermined maximum value of the power consumption, U, of the circuitdcAnd the voltage of the direct current transmission line.
the energy control module, the topology structure diagram is shown in fig. 7, and includes:
The circuit comprises a main switch, a capacitor, an auxiliary switch and an auxiliary resistor;
the auxiliary switch is connected with the auxiliary resistor in series to form an auxiliary loop;
the main switch, the capacitor and the auxiliary loop are connected in parallel, and the initial state of the auxiliary switch is set to be a closed state;
the energy control module includes three operating states:
short-circuit state: when the main switch is closed, the energy control module is in short circuit, and the capacitor does not divide voltage;
partial pressure state: the main switch and the auxiliary switch are disconnected, and the capacitor is connected in series in the circuit to divide voltage;
and (4) protection state: the main switch is switched off and the auxiliary switch is switched on, at the moment, the auxiliary resistor and the capacitor form a loop, and the capacitor discharges and reduces voltage.
The minimum number of the energy control modules arranged in the circuit is determined by the voltage-resisting capacity of the main switch and the voltage of the direct-current transmission line, and the calculation formula is as follows:
wherein N ism_min_usyminimum number of energy control modules, N, in an asymmetrical arrangementm_min_sywhen symmetrically arranged, the minimum number of energy control modules, UdcIs the voltage of the DC transmission line, Um_eIs the voltage withstanding capability of the main switch.
The number of energy control modules required to be put into use in the circuit is determined by the maximum power of the direct current transmission line and the energy consumption requirement of the control circuit, and the calculation formula is as follows:
Wherein N ison_usywhen the setting is asymmetric, the input quantity of the energy control module is Non_sywhen symmetrically arranged, the energy controls the input of the module, Udcis a DC line voltage, Um_eThe duty is the maximum withstand voltage of the main switch, the duty is the energy consumption requirement, and the duty is more than or equal to 0 and less than or equal to 1.
The main switch and the auxiliary switch are power electronic devices with controllable on and controllable off.
the energy control module further comprises: a first diode, a second diode, and a third diode;
The first diode is connected with the main switch in series after being connected with the main switch in reverse parallel;
the third diode is connected in parallel in reverse with the auxiliary switch.
When the circuit is connected to the direct current transmission line in an asymmetric parallel mode, the main resistor is connected with the negative end of the direct current transmission line, and the inductor is connected with the positive end of the direct current transmission line;
when the circuits are symmetrically connected in parallel to the direct current circuit, the main resistors of the two circuits are connected and then grounded, and two ends of the circuits are connected in parallel to the positive end and the negative end of the direct current transmission line.
Further comprising: an inductance;
the inductor is connected in series with the energy control module;
The minimum value of the inductance is determined by the voltage of the direct current transmission line and the opening current tolerance of the main switch.
the main resistors in the circuit are arranged outside the chamber in a centralized manner, and the plurality of energy control modules are arranged in the valve hall.
The energy control module, the topology structure diagram of which is shown in fig. 8, includes:
the device comprises a main switch, a battery, an auxiliary switch, an auxiliary resistor and a diode;
the auxiliary switch is connected with the diode in parallel in the reverse direction and then connected with the auxiliary resistor in series to form an auxiliary loop;
the main switch, the battery and the auxiliary loop are connected in parallel, and the initial state of the auxiliary switch is set to be a closed state;
The energy control module includes three operating states:
Short-circuit state: when the main switch is closed, the energy control module is in short circuit, and the battery does not divide voltage;
partial pressure state: the main switch and the auxiliary switch are disconnected, and the battery is connected in series in the circuit to carry out voltage division;
and (4) protection state: the main switch is switched off and the auxiliary switch is switched on, at the moment, the auxiliary resistor and the battery form a loop, and the battery discharges and reduces voltage.
The energy control module, the topology structure diagram of which is shown in fig. 9, includes:
the circuit comprises a main switch, a first capacitor, a second capacitor, a first auxiliary switch, a second auxiliary switch and an auxiliary resistor;
the first capacitor is connected with the second capacitor in series to form a first series circuit;
the first auxiliary switch is connected with the second auxiliary switch in series to form a second series circuit;
the first series circuit and the second series circuit are connected with the main switch in parallel, and the central point of the first series circuit is connected with the central point of the second series circuit through the auxiliary resistor;
The energy control module includes three operating states:
Short-circuit state: when the main switch is closed, the energy control module is in short circuit, and the first capacitor and the second capacitor do not divide voltage;
partial pressure state: the main switch, the first auxiliary switch and the second auxiliary switch are switched off, and at the moment, the first capacitor and the second capacitor are connected in series in the circuit for voltage division;
And (4) protection state: the main switch is switched off, the first auxiliary switch and the second auxiliary switch are switched on, at the moment, the auxiliary resistor and the first capacitor and the second capacitor respectively form a loop, and the first capacitor and the second capacitor discharge and step down.
the energy control module further comprises:
Two diodes;
the two diodes are respectively connected in parallel with the first auxiliary switch and the second auxiliary switch.
the energy control module, the topology structure diagram of which is shown in fig. 10, includes:
the circuit comprises a main switch, a capacitor, four auxiliary switches and an auxiliary resistor;
The auxiliary switches are connected in series in pairs to obtain two series circuits, and the two series circuits, the capacitor and the main switch are connected in parallel;
The central points of the two series circuits are connected through the auxiliary resistor;
the energy control module includes three operating states:
Short-circuit state: when the main switch is closed, the energy control module is in short circuit, and the capacitor does not divide voltage;
Partial pressure state: the main switch and all the auxiliary switches are disconnected, and at the moment, the capacitor is connected in series in the circuit for voltage division;
and (4) protection state: the main switch is switched off, all the auxiliary switches are switched on, at the moment, the auxiliary resistor and the capacitor form a loop, and the capacitor discharges and reduces voltage.
the energy control module further comprises:
four diodes;
The diodes are respectively connected in parallel in the reverse direction on the auxiliary switch.
Example 2:
The embodiment provides an energy control method, which comprises the following steps:
a control method of the energy control circuit, comprising:
Determining the input amount of the energy control module according to the energy consumption requirement;
adjusting energy control modules needing to be put into a voltage division state according to the input quantity, and adjusting the rest energy control modules into a short-circuit state;
And tracking the state of the energy control module and keeping the voltage division stable.
The adjusting the energy control module to be input into a partial pressure state according to the input amount includes:
determining an energy control module required to be input according to the input amount;
and disconnecting a main switch and an auxiliary switch in the energy control module to be input, and connecting the capacitor in series in the circuit for voltage division.
The tracking the state of the energy control module and the keeping of the partial pressure stable comprise:
Acquiring the voltage at two ends of the capacitor in real time, closing the auxiliary switch when the voltage at two ends of the capacitor is increased to a first threshold value, forming a closed loop by the capacitor and the auxiliary resistor at the moment, and discharging and reducing the voltage of the capacitor;
And when the voltage at the two ends of the capacitor is reduced to a second threshold value, the auxiliary switch is switched off, and the capacitor is connected in series in the circuit for voltage division.
the capacitor is connected in the direct current circuit, when the voltage of the capacitor is divided to a first threshold value, the auxiliary switch is closed, the capacitor and the auxiliary resistor form a closed loop, the capacitor reduces the voltage, and the voltage reduction process is a transient process. The first threshold is smaller than the breakdown voltage of the capacitor, and the second threshold is slightly smaller than the first threshold.
the determining the input amount of the energy control module according to the pre-acquired energy consumption requirement comprises the following steps:
determining the input amount of the energy control module based on the energy consumption demand and the partial pressure amount of the capacitor, as shown in the following formula:
Wherein N ison_usywhen the setting is asymmetric, the input quantity of the energy control module is Non_sywhen symmetrically arranged, the energy controls the input of the module, UdcIs a DC line voltage, Umothe duty is the energy consumption requirement, and is more than or equal to 0 and less than or equal to 1.
example 3:
Taking a certain DC engineering as an example, the rated DC voltage U of the engineeringdcThe maximum power consumed by the energy control circuit is Pmaxthe main resistance value R can be obtained as 900MWm_usy455 Ω; the main switch voltage endurance of the energy control module is Um_e3kV, minimum number N of energy control modulesm_min_usy213.33, the actual design value N of the energy control modulem240; the minimum power absorbed by the energy control circuit is Pmin200MW auxiliary resistor Ra_usy6.64 Ω; main switching device K of energy control modulemhas an on-current withstand capability ofa point minimum L can be derivedm_min_usy0.32mH, design value of inductance Lm1 mH; if the power consumed by the energy control circuit is 300MW, the number of auxiliary resistors to be added is 137, and if the power consumed by the energy control circuit is 500MW, the number of auxiliary resistors to be added is 55.
it is to be understood that the embodiments described are only a few embodiments of the present invention, and not all 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.
as will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
these computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
these computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
the present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (20)
1. An energy control circuit based on a resistance-capacitance device is characterized in that the circuit is connected with a receiving end converter station in parallel and then is connected with a direct current transmission line, and the circuit comprises:
the system comprises a main resistor and a plurality of energy control modules;
The main resistor and the energy control modules are sequentially connected in series;
the main resistor is used for providing main power consumed by the energy control circuit;
The energy control module is used for circuit voltage division.
2. the circuit of claim 1,
the circuit is connected to the DC power transmission line in an asymmetric or symmetric way.
3. The circuit of claim 2,
The resistance value of the main resistor is determined by the preset maximum power consumption value of the circuit and the voltage of the direct current transmission line, and the resistance value of the main resistor is calculated according to the following formula:
wherein R ism_usyIs the resistance value of the main resistor, Pmaxfor a predetermined maximum value of the power consumption, U, of the circuitdcand the voltage of the direct current transmission line.
4. The circuit of claim 2, wherein the energy control module comprises:
The circuit comprises a main switch, a capacitor, an auxiliary switch and an auxiliary resistor;
The auxiliary switch is connected with the auxiliary resistor in series to form an auxiliary loop;
The main switch, the capacitor and the auxiliary loop are connected in parallel, and the initial state of the auxiliary switch is set to be a closed state;
the energy control module includes three operating states:
short-circuit state: when the main switch is closed, the energy control module is in short circuit, and the capacitor does not divide voltage;
partial pressure state: the main switch and the auxiliary switch are disconnected, and the capacitor is connected in series in the circuit to divide voltage;
And (4) protection state: the main switch is switched off and the auxiliary switch is switched on, at the moment, the auxiliary resistor and the capacitor form a loop, and the capacitor discharges and reduces voltage.
5. The circuit of claim 4,
The minimum number of the energy control modules arranged in the circuit is determined by the voltage-resisting capacity of the main switch and the voltage of the direct-current transmission line, and the calculation formula is as follows:
wherein N ism_min_usyMinimum number of energy control modules, N, in an asymmetrical arrangementm_min_sywhen symmetrically arranged, the minimum number of energy control modules, UdcIs the voltage of the DC transmission line, Um_eis the voltage withstanding capability of the main switch.
6. the circuit of claim 4,
the number of energy control modules required to be put into use in the circuit is determined by the maximum power of the direct current transmission line and the energy consumption requirement of the control circuit, and the calculation formula is as follows:
Wherein N ison_usyWhen the setting is asymmetric, the input quantity of the energy control module is Non_sywhen symmetrically arranged, the energy controls the input of the module, UdcIs a DC line voltage, Um_ethe duty is the maximum withstand voltage of the main switch, the duty is the energy consumption requirement, and the duty is more than or equal to 0 and less than or equal to 1.
7. the circuit of claim 4,
the main switch and the auxiliary switch are power electronic devices with controllable on and controllable off.
8. the circuit of claim 4, wherein the energy control module further comprises:
a first diode, a second diode, and a third diode;
the first diode is connected with the main switch in series after being connected with the main switch in an inverse parallel mode;
the third diode is connected in parallel in reverse with the auxiliary switch.
9. the circuit of claim 2,
when the circuit is connected to the direct current transmission line in an asymmetric parallel mode, the main resistor is connected with the negative end of the direct current transmission line, and the inductor is connected with the positive end of the direct current transmission line;
When the circuits are symmetrically connected in parallel to the direct current circuit, the main resistors of the two circuits are connected and then grounded, and two ends of the circuits are connected in parallel to the positive end and the negative end of the direct current transmission line.
10. the circuit of claim 2, further comprising: an inductance;
the inductor is connected in series with the energy control module;
the minimum value of the inductance is determined by the voltage of the direct current transmission line and the opening current tolerance of the main switch.
11. The circuit of claim 1,
the main resistors in the circuit are arranged outside the chamber in a centralized manner, and the plurality of energy control modules are arranged in the valve hall.
12. The circuit of claim 2, wherein the energy control module comprises:
the device comprises a main switch, a battery, an auxiliary switch, an auxiliary resistor and a diode;
the auxiliary switch is connected with the diode in parallel in the reverse direction and then connected with the auxiliary resistor in series to form an auxiliary loop;
The main switch, the battery and the auxiliary loop are connected in parallel, and the initial state of the auxiliary switch is set to be a closed state;
the energy control module includes three operating states:
Short-circuit state: when the main switch is closed, the energy control module is in short circuit, and the battery does not divide voltage;
Partial pressure state: the main switch and the auxiliary switch are disconnected, and the battery is connected in series in the circuit to carry out voltage division;
And (4) protection state: the main switch is switched off and the auxiliary switch is switched on, at the moment, the auxiliary resistor and the battery form a loop, and the battery discharges and reduces voltage.
13. The circuit of claim 2, wherein the energy control module comprises:
the circuit comprises a main switch, a first capacitor, a second capacitor, a first auxiliary switch, a second auxiliary switch and an auxiliary resistor;
The first capacitor is connected with the second capacitor in series to form a first series circuit;
The first auxiliary switch is connected with the second auxiliary switch in series to form a second series circuit;
The first series circuit and the second series circuit are connected with the main switch in parallel, and the central point of the first series circuit is connected with the central point of the second series circuit through the auxiliary resistor;
The energy control module includes three operating states:
Short-circuit state: when the main switch is closed, the energy control module is in short circuit, and the first capacitor and the second capacitor do not divide voltage;
Partial pressure state: the main switch, the first auxiliary switch and the second auxiliary switch are switched off, and at the moment, the first capacitor and the second capacitor are connected in series in the circuit for voltage division;
and (4) protection state: the main switch is switched off, the first auxiliary switch and the second auxiliary switch are switched on, at the moment, the auxiliary resistor and the first capacitor and the second capacitor respectively form a loop, and the first capacitor and the second capacitor discharge and step down.
14. the circuit of claim 13, wherein the energy control module further comprises:
two diodes;
the two diodes are respectively connected in parallel with the first auxiliary switch and the second auxiliary switch.
15. The circuit of claim 2, wherein the energy control module comprises:
the circuit comprises a main switch, a capacitor, four auxiliary switches and an auxiliary resistor;
The auxiliary switches are connected in series in pairs to obtain two series circuits, and the two series circuits, the capacitor and the main switch are connected in parallel;
The central points of the two series circuits are connected through the auxiliary resistor;
The energy control module includes three operating states:
short-circuit state: when the main switch is closed, the energy control module is in short circuit, and the capacitor does not divide voltage;
partial pressure state: the main switch and all the auxiliary switches are disconnected, and at the moment, the capacitor is connected in series in the circuit for voltage division;
and (4) protection state: the main switch is switched off, all the auxiliary switches are switched on, at the moment, the auxiliary resistor and the capacitor form a loop, and the capacitor discharges and reduces voltage.
16. the circuit of claim 15, wherein the energy control module further comprises:
four diodes;
The diodes are respectively connected in parallel in the reverse direction on the auxiliary switch.
17. A method of controlling the energy control circuit of claims 1-11, comprising:
Determining the input amount of the energy control module according to the energy consumption requirement;
According to the input amount, adjusting the energy control modules to be input into a partial pressure state, and adjusting the rest energy control modules into a short-circuit state;
and tracking the state of the energy control module and keeping the voltage division stable.
18. the method according to claim 17, wherein said adjusting said energy control module to be charged to a partial pressure state according to said amount of charge comprises:
determining an energy control module required to be input according to the input amount;
and disconnecting a main switch and an auxiliary switch in the energy control module to be input, and connecting the capacitor in series in the circuit for voltage division.
19. The method of claim 17, wherein said tracking the state of said energy control module to maintain a stable voltage division comprises:
Acquiring the voltage at two ends of the capacitor in real time, closing the auxiliary switch when the voltage at two ends of the capacitor is increased to a first threshold value, forming a closed loop by the capacitor and the auxiliary resistor at the moment, and discharging and reducing the voltage of the capacitor;
when the voltage at the two ends of the capacitor is reduced to a second threshold value, the auxiliary switch is switched off, and the capacitor is connected in series in the circuit for voltage division;
Wherein the first threshold is greater than a second threshold.
20. the method of claim 17, wherein determining the input of the energy control module based on the energy consumption requirement comprises:
Determining the input amount of the energy control module based on the energy consumption demand and the partial pressure amount of the capacitor, as shown in the following formula:
wherein N ison_usywhen the setting is asymmetric, the input quantity of the energy control module is Non_sywhen symmetrically arranged, the energy controls the input of the module, Udcis a DC line voltage, Umothe duty is the energy consumption requirement, and is more than or equal to 0 and less than or equal to 1.
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