CN110571814B - 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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- CN110571814B CN110571814B CN201910700375.1A CN201910700375A CN110571814B CN 110571814 B CN110571814 B CN 110571814B CN 201910700375 A CN201910700375 A CN 201910700375A CN 110571814 B CN110571814 B CN 110571814B
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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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Abstract
An energy control circuit and method based on a resistance-capacitance device, comprising: the circuit is connected with the receiving end converter station in parallel and then is connected with the direct current transmission line, and the circuit comprises: a main resistor and a plurality of energy control modules; the main resistor and the plurality of 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 access or the cutting of the energy control module in the energy control circuit to control the energy consumption of the direct current circuit, and the control process is simple; in addition, the direct-current circuit voltage can be divided under the condition that the direct-current circuit is at high voltage by controlling the access or the cutting-off of the energy control module, so that the problem of damage to electric elements of the energy control circuit caused by overhigh voltage is avoided. The simple control method realizes the effects of voltage regulation and voltage division 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 power 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 the energy source base to the load center, the structure diagram of the direct current transmission line is shown in fig. 2, for the direct current transmission project in operation, the electric energy consumed by the receiving end is balanced with the electric energy generated by the transmitting end, and the voltage and the working frequency of the power grid of the transmitting end are kept constant. When the power system at the receiving end is disturbed or fails and the electric energy sent by the sending end cannot be consumed, the voltage and the frequency of the power grid at the sending end are disturbed, and the disturbance can be reduced by quickly adjusting the output of the generator; if the power supply of the transmitting end is a thermal power generator or a hydroelectric power generator, the output of the power generator can be adjusted, but a certain time delay is required in the adjustment process, the instant response cannot be realized, and the voltage and the frequency of the power grid still have disturbance; if the power supply at the power transmission end is a wind generating set, the output force of the wind generating set cannot be adjusted according to the operation requirement because the wind power in the nature cannot be controlled, the voltage and the frequency of the power supply at the power transmission end are severely disturbed, and the power generating set can be cracked when 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 power grid at a transmitting end and the installed capacity of a hydroelectric generator are increased along with the ship height, the quick adjustment of the output of the generator is difficult, and the difficulty is further aggravated by bundling and out-transmitting wind, light, water and thermal power; the development of the flexible direct current transmission technology enables the wind power generation grid-connected scale to be expanded increasingly, and the risk of cracking of the wind generating set caused by mismatching of power transmitted to and received from a power grid at a receiving end is increased increasingly.
In order to solve the above problems and improve the operational reliability of dc power transmission, an energy control circuit needs to be designed to maintain the power balance of the transmitting and receiving ends of the whole dc power transmission system.
Three types of energy control circuits are currently available. The circuit 1 uses a mode that a switch is connected with a resistor in series, as shown in fig. 3, the switch is a valve formed by connecting power electronic devices in series, the power consumption of the resistor is adjusted by controlling the valve to be opened and closed in a Pulse Width Modulation (PWM) mode, and the circuit has the characteristics of simple structure and easiness in control; however, after the direct-current voltage rises to a certain extent, the voltage equalizing of the devices becomes difficult due to the increase of the number of the power electronic devices, and the action consistency of all the power electronic devices cannot be ensured due to the adoption of a pulse width modulation mode; therefore, the control circuit is suitable for the field of low voltage. 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, the module voltage sharing is realized by the module capacitor, 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 by direct current voltage, and has the defects that the energy-consuming resistor is arranged in the module, the module body and the valve hall building area are increased, and the requirement on a cooling system is high. Compared with the circuit 1, the improvement is that the switch valve adopts a Modular Multilevel Converter (MMC) module to be connected in series, as shown in fig. 5, the modular multilevel converter module can adopt a full-bridge or half-bridge structure, the control method can realize module voltage equalizing through charge and discharge of a capacitor of the modular multilevel converter module, and when the control circuit acts, the modular multilevel converter module does not need to be simultaneously switched, 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 defects of complex control mode and high equipment cost.
Disclosure of Invention
In order to solve the problem that an energy control method applicable to a high-voltage direct current circuit is lacked in the prior art, the invention provides an energy control circuit and an energy control 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, the circuit is connected in parallel with a receiving-end converter station and then connected into a direct-current transmission line, and the circuit comprises:
a main resistor and a plurality of energy control modules;
the main resistor and the plurality of 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 asymmetric or symmetric and connected in parallel to the dc power line.
Preferably, the resistance of the main resistor is determined by a preset maximum consumption power value of the circuit and the voltage of the direct current transmission line, and the resistance of the main resistor is calculated according to the following formula:
wherein R is m_usy Is the resistance value of the main resistor, P max For a preset maximum consumption power value of the circuit, U dc Is the voltage of the direct current transmission line.
Preferably, the energy control module includes:
the main switch, the capacitor, the auxiliary switch and the auxiliary resistor;
the auxiliary switch and the auxiliary resistor are connected in series to form an auxiliary loop;
the main switch, the capacitor and the auxiliary loop are mutually connected in parallel, and the initial state of the auxiliary switch is set to be a closed state;
the energy control module comprises three working states:
short circuit state: the main switch is closed, at the moment, the energy control module is short-circuited, 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 for voltage division;
protection state: the main switch is opened, the auxiliary switch is closed, the auxiliary resistor and the capacitor form a loop, and the capacitor discharges and reduces the voltage.
Preferably, the minimum number of 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 is m_min_usy In the case of asymmetric arrangement, the minimum number of the energy control modules, N m_min_sy In the symmetrical arrangement, the minimum number of the energy control modules, U dc U is the voltage of the direct current transmission line m_e Is the voltage withstand capability of the main switch.
Preferably, the number of energy control modules 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 is on_usy When the energy control module is asymmetrically arranged, the input quantity of the energy control module is N on_sy When the energy control modules are symmetrically arranged, the input quantity of the energy control modules, U dc Is the direct current line voltage, U m_e The maximum withstand voltage of the main switch 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 electronics that are controllably turned on and controllably turned off.
Preferably, the energy control module further comprises: a first diode, a second diode, and a third diode;
the first diode is connected in series with the second diode after being reversely connected in parallel with the main switch;
the third diode is connected in parallel with the auxiliary switch in reverse.
Preferably, when the circuit is asymmetrically connected to the direct current transmission line in parallel, 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 with the direct current circuit in parallel, the main resistors of the two circuits are connected with each other and then grounded, and the two ends of the circuits are connected with the positive end and the negative end of the direct current transmission line in parallel.
Preferably, the method further comprises: an inductance;
the inductor is connected with the energy control module in series;
the minimum value of the inductance is determined by the voltage of the direct current transmission line and the open current tolerance capability of the main switch.
Preferably, the main resistor in the circuit is arranged in a concentrated manner outside the chamber, and the plurality of energy control modules are arranged in the valve hall.
Preferably, the energy control module includes:
the auxiliary switch comprises a main switch, a battery, an auxiliary switch, an auxiliary resistor and a diode;
the auxiliary switch is connected with the diode in series after being reversely connected with the diode in parallel, so as to form an auxiliary loop;
the main switch, the battery and the auxiliary circuit are mutually connected in parallel, and the initial state of the auxiliary switch is set to be a closed state;
the energy control module comprises three working states:
short circuit state: the main switch is closed, at the moment, the energy control module is short-circuited, 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 for voltage division;
protection state: the main switch is opened and the auxiliary switch is closed, at this time, the auxiliary resistor and the battery form a loop, and the battery discharges and reduces the voltage.
Preferably, the energy control module includes:
the main switch, the first capacitor, the second capacitor, the first auxiliary switch, the second auxiliary switch and the auxiliary resistor;
the first capacitor and the second capacitor are connected 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 in parallel with the main switch together, and the center point of the first series circuit and the center point of the second series circuit are connected through the auxiliary resistor;
the energy control module comprises three working states:
short circuit state: the main switch is closed, at the moment, the energy control module is short-circuited, 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 disconnected, and the first capacitor and the second capacitor are connected in series in the circuit for voltage division;
protection state: the main switch is opened, the first auxiliary switch and the second auxiliary switch are closed, 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 comprises:
two diodes;
the two diodes are connected in parallel with the first auxiliary switch and the second auxiliary switch respectively.
Preferably, the energy control module includes:
the main switch, the 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 center points of the two series circuits are connected through the auxiliary resistor;
the energy control module comprises three working states:
short circuit state: the main switch is closed, at the moment, the energy control module is short-circuited, and the capacitor does not divide voltage;
partial pressure state: the main switch and all the auxiliary switches are disconnected, and the capacitor is connected in series in the circuit for voltage division;
protection state: the main switch is opened, all the auxiliary switches are closed, at the moment, the auxiliary resistor and the capacitor form a loop, and the capacitor discharges and reduces the voltage.
Preferably, the energy control module further comprises:
four diodes;
the diodes are respectively reversely connected with the auxiliary switch in parallel.
A control method of the energy control circuit, characterized by comprising:
determining the input amount of the energy control module according to the energy consumption requirement;
according to the input quantity, an energy control module to be input is adjusted to be in a partial pressure state, and the rest energy control modules are adjusted to be in a short circuit state;
and tracking the state of the energy control module, and keeping the partial pressure stable.
Preferably, the adjusting the energy control module to be put into a partial pressure state according to the input amount includes:
determining an energy control module to be input according to the input quantity;
and disconnecting the main switch and the auxiliary switch in the energy control module which are needed to be put into, and connecting the capacitor in series in the circuit for voltage division at the moment.
Preferably, the tracking the state of the energy control module, keeping the partial pressure stable, includes:
acquiring the voltages at two ends of the capacitor in real time, closing the auxiliary switch when the voltages at two ends of the capacitor are increased to a first threshold value, forming a closed loop by the capacitor and the auxiliary resistor at the moment, discharging the capacitor and reducing the voltage;
when the voltage at two ends of the capacitor is reduced to a second threshold value, the auxiliary switch is cut off, and the capacitor is connected in series in the circuit for voltage division;
wherein the first threshold is greater than the second threshold.
Preferably, the determining the input amount of the energy control module according to the energy consumption requirement includes:
and determining the input amount of the energy control module based on the energy consumption requirement and the partial pressure amount of the capacitor, wherein the input amount is shown in the following formula:
wherein N is on_usy When the energy control module is asymmetrically arranged, the input quantity of the energy control module is N on_sy When the energy control modules are symmetrically arranged, the input quantity of the energy control modules, U dc Is the direct current line voltage, U mo The 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, the circuit is connected in parallel with a receiving-end converter station and then connected into a direct-current transmission line, and the circuit comprises: a main resistor and a plurality of energy control modules; the main resistor and the plurality of 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 has disturbance and faults, the energy control module can control the energy consumption power in the circuit, so as to control whether the whole circuit is put into an operating state or not, and further maintain the balance operation of the whole direct current transmission system.
The scheme can directly control the access or the cutting of the energy control module in the energy control circuit to control the energy consumption of the direct current circuit, and the control process is simple; and the voltage division treatment of the direct current line voltage can be realized under the condition that the direct current line is high voltage by controlling the access or the cutting-off of the energy control module, so that the problem of damage to the electrical elements of the energy control circuit caused by overhigh voltage is avoided.
The energy control module in this scheme only includes main switch, auxiliary switch, main resistance, auxiliary resistance, electric capacity and diode, and the cost is lower, and circuit connection is simple and take up an area of for a short time.
In the circuit that this scheme provided, auxiliary resistor can install indoor, and outdoor concentrated arrangement can be adopted to the main resistance, through natural cold wind cooling, has saved refrigeration cost.
Drawings
FIG. 1 is a block diagram of an energy control circuit based on a resistive-capacitive device of the present invention;
fig. 2 is a block diagram of a dc transmission line in the prior art;
FIG. 3 is a block diagram of a circuit 1 according to the prior art;
FIG. 4 is a block diagram of a circuit 2 according to the prior art;
fig. 5 is a diagram showing a structure of a circuit 3 in the prior art;
FIG. 6 is a diagram illustrating a symmetrical connection of the energy control circuit according to the present invention;
FIG. 7 is a first topology of the energy control module of the present invention;
FIG. 8 is a second topology of the energy control module of the present invention;
FIG. 9 is a third topology of the energy control module of the present invention;
FIG. 10 is a fourth topology of the energy control module of the present invention;
wherein, 1-converter transformer; a 2-inverter; a 3-ac filter; a 4-smoothing reactor; a 5-DC filter; 6-off-converter station cooling system.
Detailed Description
For a better understanding of the present invention, reference is made to the following description, drawings and examples.
Example 1:
the embodiment provides an energy control circuit based on a resistance-capacitance device, the circuit structure is shown in fig. 1, the circuit is connected in parallel with a receiving-end converter station and then connected into a direct-current transmission line, and the circuit comprises:
a main resistor and a plurality of energy control modules;
the main resistor and the plurality of 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 asymmetric or symmetrically connected to the direct current transmission line in parallel, and the symmetric connection diagram is shown in fig. 6.
The resistance of the main resistor is determined by the preset maximum consumption power value of the circuit and the voltage of the direct current transmission line, and the resistance of the main resistor is calculated according to the following formula:
wherein R is m_usy Is the resistance value of the main resistor, P max For a preset maximum consumption power value of the circuit, U dc Is the voltage of the direct current transmission line.
The topology structure of the energy control module is shown in fig. 7, and the energy control module comprises:
the main switch, the capacitor, the auxiliary switch and the auxiliary resistor;
the auxiliary switch and the auxiliary resistor are connected in series to form an auxiliary loop;
the main switch, the capacitor and the auxiliary loop are mutually connected in parallel, and the initial state of the auxiliary switch is set to be a closed state;
the energy control module comprises three working states:
short circuit state: the main switch is closed, at the moment, the energy control module is short-circuited, 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 for voltage division;
protection state: the main switch is opened, the auxiliary switch is closed, the auxiliary resistor and the capacitor form a loop, and the capacitor discharges and reduces the voltage.
The minimum number of the energy control modules arranged in the circuit is determined by the voltage withstand capacity of the main switch and the voltage of the direct current transmission line, and the calculation formula is as follows:
wherein N is m_min_usy In the case of asymmetric arrangement, the minimum number of the energy control modules, N m_min_sy In the symmetrical arrangement, the minimum number of the energy control modules, U dc U is the voltage of the direct current transmission line m_e Is the voltage withstand capability of the main switch.
The number of the energy control modules needed 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 is on_usy When the energy control module is asymmetrically arranged, the input quantity of the energy control module is N on_sy When the energy control modules are symmetrically arranged, the input quantity of the energy control modules, U dc Is the direct current line voltage, U m_e The maximum withstand voltage of the main switch 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 which can be controlled to be opened and blocked.
The energy control module further comprises: a first diode, a second diode, and a third diode;
the first diode is connected in series with the second diode after being reversely connected in parallel with the main switch;
the third diode is connected in parallel with the auxiliary switch in reverse.
When the circuit is asymmetrically connected to the direct current transmission line in parallel, 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 with the direct current circuit in parallel, the main resistors of the two circuits are connected with each other and then grounded, and the two ends of the circuits are connected with the positive end and the negative end of the direct current transmission line in parallel.
Further comprises: an inductance;
the inductor is connected with the energy control module in series;
the minimum value of the inductance is determined by the voltage of the direct current transmission line and the open current tolerance capability of the main switch.
The main resistance chambers in the circuit are arranged in a concentrated manner outside the chamber, and the plurality of energy control modules are arranged in the valve hall.
The topology structure of the energy control module is shown in fig. 8, and the energy control module comprises:
the auxiliary switch comprises a main switch, a battery, an auxiliary switch, an auxiliary resistor and a diode;
the auxiliary switch is connected with the diode in series after being reversely connected with the diode in parallel, so as to form an auxiliary loop;
the main switch, the battery and the auxiliary circuit are mutually connected in parallel, and the initial state of the auxiliary switch is set to be a closed state;
the energy control module comprises three working states:
short circuit state: the main switch is closed, at the moment, the energy control module is short-circuited, 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 for voltage division;
protection state: the main switch is opened and the auxiliary switch is closed, at this time, the auxiliary resistor and the battery form a loop, and the battery discharges and reduces the voltage.
The topology structure of the energy control module is shown in fig. 9, and includes:
the main switch, the first capacitor, the second capacitor, the first auxiliary switch, the second auxiliary switch and the auxiliary resistor;
the first capacitor and the second capacitor are connected 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 in parallel with the main switch together, and the center point of the first series circuit and the center point of the second series circuit are connected through the auxiliary resistor;
the energy control module comprises three working states:
short circuit state: the main switch is closed, at the moment, the energy control module is short-circuited, 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 disconnected, and the first capacitor and the second capacitor are connected in series in the circuit for voltage division;
protection state: the main switch is opened, the first auxiliary switch and the second auxiliary switch are closed, 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 connected in parallel with the first auxiliary switch and the second auxiliary switch respectively.
The topology structure of the energy control module is shown in fig. 10, and includes:
the main switch, the 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 center points of the two series circuits are connected through the auxiliary resistor;
the energy control module comprises three working states:
short circuit state: the main switch is closed, at the moment, the energy control module is short-circuited, and the capacitor does not divide voltage;
partial pressure state: the main switch and all the auxiliary switches are disconnected, and the capacitor is connected in series in the circuit for voltage division;
protection state: the main switch is opened, all the auxiliary switches are closed, at the moment, the auxiliary resistor and the capacitor form a loop, and the capacitor discharges and reduces the voltage.
The energy control module further comprises:
four diodes;
the diodes are respectively reversely connected with the auxiliary switch in parallel.
Example 2:
the embodiment provides an energy control method, which includes:
a control method of the energy control circuit, comprising:
determining the input amount of the energy control module according to the energy consumption requirement;
according to the input quantity, an energy control module to be input is adjusted to be in a partial pressure state, and the rest energy control modules are adjusted to be in a short circuit state;
and tracking the state of the energy control module, and keeping the partial pressure stable.
And adjusting the energy control module to be input into a partial pressure state according to the input amount, wherein the method comprises the following steps:
determining an energy control module to be input according to the input quantity;
and disconnecting the main switch and the auxiliary switch in the energy control module which are needed to be put into, and connecting the capacitor in series in the circuit for voltage division at the moment.
The tracking the state of the energy control module, maintaining the partial pressure stable includes:
acquiring the voltages at two ends of the capacitor in real time, closing the auxiliary switch when the voltages at two ends of the capacitor are increased to a first threshold value, forming a closed loop by the capacitor and the auxiliary resistor at the moment, discharging the capacitor and reducing the voltage;
when the voltage at two ends of the capacitor is reduced to a second threshold value, the auxiliary switch is turned 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 is used for reducing the voltage, and the voltage reduction process is a transient process. The first threshold is less than the breakdown voltage of the capacitor and the second threshold is slightly less 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:
and determining the input amount of the energy control module based on the energy consumption requirement and the partial pressure amount of the capacitor, wherein the input amount is shown in the following formula:
wherein N is on_usy When the energy control module is asymmetrically arranged, the input quantity of the energy control module is N on_sy When the energy control modules are symmetrically arranged, the input quantity of the energy control modules, U dc Is the direct current line voltage, U mo The 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 engineering rated DC voltage U dc The energy control circuit adopts an asymmetric arrangement mode, and the maximum power required to be consumed by the energy control circuit is P max =900 MW, the main resistance value R can be obtained m_usy =455 Ω; the main switch voltage withstand capability of the energy control module is U m_e =3 kV, minimum number N of energy control modules m_min_usy =213.33, the actual design value N of the energy control module m =240; the minimum power absorbed by the energy control circuit is P min =200mw, auxiliary resistor R a_usy =6.64Ω; main switch device K of energy control module m Has the on-current tolerance of
The minimum value L of the point can be obtained m_min_usy Design value L of inductance=0.32 mH m =1mh; the number of auxiliary resistors to be added is 137 if the power consumption of the energy control circuit is 300MW, and 55 if the power consumption of the energy control circuit is 500 MW.
It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 foregoing is illustrative of the present invention and is not to be construed as limiting thereof, but rather as providing for the use of additional embodiments and advantages of all such modifications, equivalents, improvements and similar to the present invention are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (17)
1. An energy control circuit based on a resistance-capacitance device is characterized in that 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:
a main resistor and a plurality of energy control modules;
the main resistor and the plurality of 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 asymmetric or symmetrically connected to the direct current transmission line in parallel;
the resistance of the main resistor is determined by the preset maximum consumption power value of the circuit and the voltage of the direct current transmission line, and the resistance of the main resistor is calculated according to the following formula:
wherein R is m_usy Is the resistance value of the main resistor, P max For a preset maximum consumption power value of the circuit, U dc Is the voltage of the direct current transmission line.
2. The circuit of claim 1, wherein the energy control module comprises:
the main switch, the capacitor, the auxiliary switch and the auxiliary resistor;
the auxiliary switch and the auxiliary resistor are connected in series to form an auxiliary loop;
the main switch, the capacitor and the auxiliary loop are mutually connected in parallel, and the initial state of the auxiliary switch is set to be a closed state;
the energy control module comprises three working states:
short circuit state: the main switch is closed, at the moment, the energy control module is short-circuited, 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 for voltage division;
protection state: the main switch is opened, the auxiliary switch is closed, the auxiliary resistor and the capacitor form a loop, and the capacitor discharges and reduces the voltage.
3. The circuit of claim 2, wherein,
the minimum number of the energy control modules arranged in the circuit is determined by the voltage withstand capacity of the main switch and the voltage of the direct current transmission line, and the calculation formula is as follows:
wherein N is m_min_usy In the case of asymmetric arrangement, the minimum number of the energy control modules, N m_min_sy In the symmetrical arrangement, the minimum number of the energy control modules, U dc U is the voltage of the direct current transmission line m_e Is the voltage withstand capability of the main switch.
4. The circuit of claim 2, wherein,
the number of the energy control modules needed 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 is on_usy When the energy control module is asymmetrically arranged, the input quantity of the energy control module is N on_sy When the energy control modules are symmetrically arranged, the input quantity of the energy control modules, U dc Is direct currentLine voltage, U m_e The maximum withstand voltage of the main switch is the energy consumption requirement, and the duty is more than or equal to 0 and less than or equal to 1.
5. The circuit of claim 2, wherein,
the main switch and the auxiliary switch are power electronic devices which can be controlled to be opened and blocked.
6. The circuit of claim 2, wherein the energy control module further comprises: a first diode, a second diode, and a third diode;
the first diode is connected in series with the second diode after being reversely connected in parallel with the main switch;
the third diode is connected in parallel with the auxiliary switch in reverse.
7. The circuit of claim 1, wherein,
when the circuit is asymmetrically connected to the direct current transmission line in parallel, the main resistor is connected with the negative end of the direct current transmission line, and the circuit is connected with the positive end of the direct current transmission line;
when the circuits are symmetrically connected to the direct current transmission line in parallel, the main resistors of the two circuits are connected to the ground, and the two ends of the circuits are connected to the positive end and the negative end of the direct current transmission line in parallel.
8. The circuit of claim 2, further comprising: an inductance;
the inductor is connected with the energy control module in series;
the minimum value of the inductance is determined by the voltage of the direct current transmission line and the open current tolerance capability of the main switch.
9. The circuit of claim 1, wherein,
the main resistance chambers in the circuit are arranged in a concentrated manner outside the chamber, and the plurality of energy control modules are arranged in the valve hall.
10. The circuit of claim 1, wherein the energy control module comprises:
the auxiliary switch comprises a main switch, a battery, an auxiliary switch, an auxiliary resistor and a diode;
the auxiliary switch is connected with the diode in series after being reversely connected with the diode in parallel, so as to form an auxiliary loop;
the main switch, the battery and the auxiliary circuit are mutually connected in parallel, and the initial state of the auxiliary switch is set to be a closed state;
the energy control module comprises three working states:
short circuit state: the main switch is closed, at the moment, the energy control module is short-circuited, 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 for voltage division;
protection state: the main switch is opened and the auxiliary switch is closed, at this time, the auxiliary resistor and the battery form a loop, and the battery discharges and reduces the voltage.
11. The circuit of claim 1, wherein the energy control module comprises:
the main switch, the first capacitor, the second capacitor, the first auxiliary switch, the second auxiliary switch and the auxiliary resistor;
the first capacitor and the second capacitor are connected 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 in parallel with the main switch together, and the center point of the first series circuit and the center point of the second series circuit are connected through the auxiliary resistor;
the energy control module comprises three working states:
short circuit state: the main switch is closed, at the moment, the energy control module is short-circuited, 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 disconnected, and the first capacitor and the second capacitor are connected in series in the circuit for voltage division;
protection state: the main switch is opened, the first auxiliary switch and the second auxiliary switch are closed, 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.
12. The circuit of claim 11, wherein the energy control module further comprises:
two diodes;
the two diodes are connected in parallel with the first auxiliary switch and the second auxiliary switch respectively.
13. The circuit of claim 1, wherein the energy control module comprises:
the main switch, the 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 center points of the two series circuits are connected through the auxiliary resistor;
the energy control module comprises three working states:
short circuit state: the main switch is closed, at the moment, the energy control module is short-circuited, and the capacitor does not divide voltage;
partial pressure state: the main switch and all the auxiliary switches are disconnected, and the capacitor is connected in series in the circuit for voltage division;
protection state: the main switch is opened, all the auxiliary switches are closed, at the moment, the auxiliary resistor and the capacitor form a loop, and the capacitor discharges and reduces the voltage.
14. The circuit of claim 13, wherein the energy control module further comprises:
four diodes;
the diodes are respectively reversely connected with the auxiliary switch in parallel.
15. A control method of the energy control circuit for implementing the resistance-capacitance device based energy control circuit as claimed in claim 2, comprising:
determining the input amount of the energy control module according to the energy consumption requirement;
according to the input quantity, the energy control module to be input is adjusted to be in a partial pressure state, and the rest energy control modules are adjusted to be in a short circuit state;
tracking the state of the energy control module, and keeping the partial pressure stable;
the determining the input amount of the energy control module according to the energy consumption requirement comprises the following steps:
and determining the input amount of the energy control module based on the energy consumption requirement and the partial pressure amount of the capacitor, wherein the input amount is shown in the following formula:
wherein N is on_usy When the energy control module is asymmetrically arranged, the input quantity of the energy control module is N on_sy When the energy control modules are symmetrically arranged, the input quantity of the energy control modules, U dc Is the direct current line voltage, U mo The duty is the energy consumption requirement and is more than or equal to 0 and less than or equal to 1.
16. The method of claim 15, wherein adjusting the energy control module to be charged to a partial pressure state according to the charge amount comprises:
determining an energy control module to be input according to the input quantity;
and disconnecting the main switch and the auxiliary switch in the energy control module which are needed to be put into, and connecting the capacitor in series in the circuit for voltage division at the moment.
17. The method of claim 16, wherein tracking the state of the energy control module to maintain a constant partial pressure comprises:
acquiring the voltages at two ends of the capacitor in real time, closing the auxiliary switch when the voltages at two ends of the capacitor are increased to a first threshold value, forming a closed loop by the capacitor and the auxiliary resistor at the moment, discharging the capacitor and reducing the voltage;
when the voltage at two ends of the capacitor is reduced to a second threshold value, the auxiliary switch is cut off, and the capacitor is connected in series in the circuit for voltage division;
wherein the first threshold is greater than the second threshold.
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