CN109617108B - Chain type energy consumption device and control method thereof - Google Patents
Chain type energy consumption device and control method thereof Download PDFInfo
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- CN109617108B CN109617108B CN201811397272.4A CN201811397272A CN109617108B CN 109617108 B CN109617108 B CN 109617108B CN 201811397272 A CN201811397272 A CN 201811397272A CN 109617108 B CN109617108 B CN 109617108B
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- energy consumption
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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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- 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
- H02J2003/365—Reducing harmonics or oscillations in HVDC
-
- 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]
Abstract
The invention discloses a chain type energy consumption device, which consists of an energy consumption branch circuit and an energy consumption resistor, wherein the energy consumption branch circuit is formed by connecting at least one energy consumption submodule in series in the same direction, and the head end of the series connection is connected with a high-potential electrode of a direct current circuit; the energy dissipation sub-module is composed of a first power semiconductor switch device, a diode and a direct current capacitor; the invention also comprises a control method of the chained energy dissipation device, when the voltage of the direct current line is increased, the direct current voltage control can be realized by sequentially switching on or off the power semiconductor switching devices in the energy dissipation submodule, the flexible input and flexible exit of the energy dissipation resistor are realized, the cost performance of the device is high, the reliability is high, and the device is easy to realize.
Description
Technical Field
The invention belongs to the technical field of high-power electronic converter, and particularly relates to a chain type energy consumption device and a control method.
Background
In a hvdc transmission system, a chain energy consumer is a vital equipment. The chain type energy consumption device is mainly applied to an application scene of island power supply, if a power generation end is an inertial power supply similar to wind power, when a power receiving end breaks down, energy is accumulated on a direct current side due to the fact that power cannot be sent out, voltage of a direct current transmission line rises, and safety operation of equipment is damaged.
In the prior art, a method is adopted, in which power semiconductor devices are directly connected in series, when a direct current voltage is too high, a resistor is put in through the control of a power electronic device, the direct current voltage is reduced due to the input of the resistor, when the energy consumption speed of the resistor exceeds the speed of accumulating energy at a direct current side, the direct current voltage is reduced, at the moment, a resistor discharge loop is switched off, the direct current voltage is increased again, and a resistor branch is repeatedly switched on and switched off to form a hysteresis control effect, and the method mainly has the following problems: when the power semiconductor switch device is turned off, consistency is difficult to guarantee due to the fact that a plurality of power semiconductor switch devices are turned off at the same time, once the power semiconductor switch devices are turned off asynchronously, the devices which are turned on slowly or turned off quickly bear overvoltage and are damaged; and high speed on and off state switching can also result in large voltage and current change rates, thereby creating magnetic field disturbances. In addition, each submodule in the prior art comprises a large number of power semiconductor devices, and the cost is high.
Disclosure of Invention
In order to solve the problems, the invention provides a chained energy dissipation device and a control method using the chained energy dissipation device, wherein the chained energy dissipation device can be connected between direct current electrodes, when the voltage of a direct current line rises, the direct current voltage control can be realized by sequentially switching on or off power semiconductor switching elements in energy dissipation sub-modules, the flexible input and flexible exit of energy dissipation resistors are realized, and the impact is avoided.
In order to achieve the above purpose, the present invention adopts the following specific scheme:
a chain type energy consumption device is composed of an energy consumption branch circuit and an energy consumption resistor, wherein the energy consumption branch circuit is formed by connecting at least one energy consumption sub-module in series in the same direction, and the head end of the series connection is connected with a high-potential electrode of a direct current circuit; the energy dissipation resistors are arranged in a centralized manner and connected in series with the energy dissipation branch circuits, one end of each energy dissipation resistor is connected with the tail end of each energy dissipation branch circuit, and the other end of each energy dissipation resistor is connected with a low potential electrode of the direct current circuit; the energy consumption submodule is composed of a first power semiconductor switch device, a diode and a direct current capacitor, wherein the first power semiconductor switch device is connected with the diode in series, and the connection modes include the following two modes:
connection mode 1: the cathode of the diode is connected with the anode of the direct current capacitor, the anode of the diode is connected with the collector of the first power semiconductor switching device, and the emitter of the first power semiconductor switching device is connected with the cathode of the direct current capacitor;
connection mode 2: the collector of the first power semiconductor switch device is connected with the positive electrode of the direct current capacitor, the emitter of the first power semiconductor switch device is connected with the cathode of the diode, and the anode of the diode is connected with the negative electrode of the direct current capacitor;
the collector of the first power semiconductor switching device serves as a positive electrode lead-out point, and the emitter of the first power semiconductor switching device serves as a negative electrode lead-out point.
And the diodes in the energy consumption sub-modules are also connected with a second power semiconductor switching device in parallel in an opposite direction.
And the energy consumption resistor is also connected in parallel with a voltage clamping unit consisting of a diode.
And the energy consumption sub-module is also connected with a bypass switch in parallel.
The energy consumption branch of the chained energy consumption device is also connected with at least one charging unit in series, and the charging unit is formed by connecting a charging resistor and a charging switch in parallel.
The chain type energy consumption device is also connected with at least one partition switch in series.
The energy consumption resistor can be replaced by an energy accumulator, and the energy accumulator has charge and discharge capacity.
Wherein the energy consuming sub-module may further comprise only a mechanical switch.
The invention also comprises a control method of the chain type energy consumption device,
(1) when the device is started, the method comprises the following steps:
step 1: the power semiconductor switch device in the energy consumption submodule is turned off, the charging switch is separated, and the isolating switch is separated;
step 2: after the direct current circuit is electrified, closing the isolating switch, and charging a direct current capacitor in the energy consumption submodule through a charging resistor;
and step 3: and after the charging is finished, closing the charging switch and bypassing the charging resistor.
(2) When the device detects an overvoltage on the dc line, the method comprises the steps of:
step 1: the device detects the voltage of a direct current line in real time, and is in a standby mode when the voltage of the direct current line does not exceed an upper limit value Umax;
step 2: when the voltage of the direct current line exceeds an upper limit value Umax, the device is in an energy consumption mode, and the step 3 is carried out;
and step 3: sequentially conducting first power semiconductor devices in the energy consumption sub-modules, wherein the conduction interval time is t;
and 4, step 4: after all the first power semiconductor devices are conducted, maintaining the state for a time length of T1;
and 5: detecting the voltage of a direct current line, and sequentially turning off first power semiconductor devices in the energy consumption submodules when the voltage of the direct current line is lower than a lower limit value Umin, wherein the turn-off interval time is t 3;
step 6: after all the first power semiconductor devices are switched off, maintaining the state for a time length of T2;
and 7: in the energy consumption mode, once the voltage of the energy consumption submodule exceeds the maximum tolerance value, the first power semiconductor device is immediately conducted.
The invention has the beneficial effects that:
1. the device, the system and the method utilize the buffering of the direct current capacitor of the energy consumption submodule to sequentially switch on or off the power semiconductor switch devices in the energy consumption submodule, realize direct current voltage control, realize flexible input and flexible exit of the energy consumption resistor, avoid the problem of voltage unevenness possibly caused by the power semiconductor switch devices which are directly connected in series when the power semiconductor switch devices are switched off, and greatly reduce the risk of overvoltage switching-off of the power semiconductor switch devices.
2. The energy consumption sub-modules in the invention adopt a modularized mode, and are easy to produce and manufacture. The energy-consuming sub-modules are connected with the bypass switch in parallel, so that the fault modules can be quickly bypassed under the condition of module fault, a certain margin can be reserved on the configuration number of the sub-modules, and the operation reliability of the device is greatly improved.
3. The resistors are arranged in a centralized manner, so that the design of a heat dissipation system is facilitated, and unified management and monitoring are facilitated. The modularized energy consumption branch circuit is combined with the centralized resistor, so that the cost performance of the whole device is optimal, and the engineering implementation difficulty is low.
4. Each energy consumption submodule only comprises a power semiconductor device and a diode, compared with the prior art, the energy consumption submodule fully utilizes the characteristics of the devices, removes unnecessary devices and greatly reduces the cost and the volume of the device.
Drawings
Fig. 1 is a topological structure diagram of the chained energy dissipation device of the present invention.
FIG. 2 is a second embodiment of the energy consuming sub-module of the present invention.
Fig. 3 is a control timing diagram of the control method of the chained energy dissipation device of the present invention.
Number designation in the figure: 1. an energy consumption branch; 2. an energy consumption submodule; 3. a power consumption resistor; 4. a bypass switch; 5. a charging resistor; 6. a charging switch; 7. a cut-off switch; 8. a voltage clamping unit.
Detailed Description
The invention will be further explained with reference to the drawings.
In order to achieve the above purpose, the present invention adopts the following specific scheme:
as shown in fig. 1, a chained energy dissipation device is composed of an energy dissipation branch 1 and an energy dissipation resistor 3, wherein the energy dissipation branch is composed of at least one energy dissipation submodule 2 connected in series in the same direction, and the head end of the series connection is connected with a high potential electrode of a direct current circuit; the energy dissipation resistors are arranged in a centralized manner and connected in series with the energy dissipation branch circuits, one end of each energy dissipation resistor is connected with the tail end of each energy dissipation branch circuit, and the other end of each energy dissipation resistor is connected with a low potential electrode of the direct current circuit; the energy consumption submodule is composed of a first power semiconductor switch device, a diode and a direct current capacitor, wherein the first power semiconductor switch device is connected with the diode in series, and the connection modes include the following two modes:
connection mode 1: the cathode of the diode is connected with the anode of the direct current capacitor, the anode of the diode is connected with the collector of the first power semiconductor switching device, and the emitter of the first power semiconductor switching device is connected with the cathode of the direct current capacitor;
connection mode 2: the collector of the first power semiconductor switch device is connected with the positive electrode of the direct current capacitor, the emitter of the first power semiconductor switch device is connected with the cathode of the diode, and the anode of the diode is connected with the negative electrode of the direct current capacitor;
the collector of the first power semiconductor switching device serves as a positive electrode lead-out point, and the emitter of the first power semiconductor switching device serves as a negative electrode lead-out point.
As shown in fig. 2, the diodes in the energy consuming sub-module are also connected in anti-parallel with a second power semiconductor switching device.
And the energy consumption resistor is also connected with a voltage clamping unit 8 consisting of a diode in parallel.
And the energy consumption sub-modules are also connected with a bypass switch 4 in parallel.
The energy consumption branch of the chain type energy consumption device is also connected with at least one charging unit in series, and the charging unit is formed by connecting a charging resistor 5 and a charging switch 6 in parallel.
Wherein, the chain type energy consumption device is also connected with at least one isolating switch 7 in series.
The energy consumption resistor can be replaced by an energy storage device, and the energy storage device has charging and discharging capacity.
Wherein the energy consuming submodule may further comprise only a mechanical switch.
The invention also comprises a control method of the chain type energy consumption device,
(1) when the device is started, the method comprises the following steps:
step 1: the power semiconductor switch device in the energy consumption submodule is turned off, the charging switch is separated, and the isolating switch is separated;
step 2: after the direct current circuit is electrified, closing the isolating switch, and charging a direct current capacitor in the energy consumption submodule through a charging resistor;
and step 3: and after the charging is finished, closing the charging switch and bypassing the charging resistor.
(2) When the device detects an overvoltage on the dc line, the method comprises the steps of:
step 1: the device detects the voltage of a direct current line in real time, and is in a standby mode when the voltage of the direct current line does not exceed an upper limit value Umax;
step 2: when the voltage of the direct current line exceeds an upper limit value Umax, the device is in an energy consumption mode, and the step 3 is carried out;
and step 3: sequentially conducting first power semiconductor devices in the energy consumption sub-modules, wherein the conduction interval time is t;
and 4, step 4: after all the first power semiconductor devices are conducted, maintaining the state for a time length of T1;
and 5: detecting the voltage of a direct current line, and sequentially turning off first power semiconductor devices in the energy consumption submodules when the voltage of the direct current line is lower than a lower limit value Umin, wherein the turn-off interval time is t 3;
step 6: after all the first power semiconductor devices are switched off, maintaining the state for a time length of T2;
and 7: in the energy consumption mode, once the voltage of the energy consumption sub-module is detected to exceed the maximum tolerance value, the first power semiconductor device is immediately conducted.
The application of the chain type energy consumption device is described by referring to the specific embodiment:
in this embodiment, the apparatus is connected to a 200kV dc line, and includes 100 energy consuming submodules in total, when in a standby state, the voltage of 200kV is divided into 100 energy consuming submodules, when the dc voltage exceeds Umax ═ 230kV, the energy consuming mode is entered, the second power semiconductor devices in the energy consuming submodules are sequentially turned on, at this time, the turn-on interval time is t, in this embodiment, t ═ 5us, because the interval time is very short, and the buffer action of the capacitor, the voltage of the rest of the non-turned-on submodules is unchanged, in a transient condition, the voltage applied to the resistor is gradually increased, after bypassing the first module, the voltage applied to the resistor is increased by V1 until all the submodules are bypassed, the voltage applied to the resistor reaches the maximum value VN, and the energy consuming capability reaches the maximum value at this time.
The holding time is T1, when the dc voltage is lower than Umin equal to 210kV, the second power semiconductor devices in the energy consuming sub-modules are sequentially turned off, the turn-off interval time is T3, in this embodiment, T3 equal to 5us, due to the short interval time and the buffer effect of the capacitor, in the transient condition, the voltage applied to the resistor is gradually reduced until all the sub-modules are put into use, the voltage borne by the resistor reaches the minimum value, at this time, the energy consuming capability reaches the minimum, and the holding time is T2 …
The two states are repeatedly switched, so that the control of the line direct current voltage can be realized, and the direct current voltage is maintained between 210kV and 230 kV. The entire control timing chart is shown in fig. 3.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and various modifications or changes made with reference to the above embodiments are within the scope of the present invention.
Claims (9)
1. A control method based on a chain type energy consumption device is characterized in that the device is composed of an energy consumption branch circuit and an energy consumption resistor, the energy consumption branch circuit is composed of at least one energy consumption submodule which are connected in series in the same direction, and the head end of the series connection is connected with a high-potential electrode of a direct current circuit; the energy dissipation resistors are arranged in a centralized manner and connected in series with the energy dissipation branch circuits, one end of each energy dissipation resistor is connected with the tail end of each energy dissipation branch circuit, and the other end of each energy dissipation resistor is connected with a low potential electrode of the direct current circuit; the energy consumption submodule is composed of a first power semiconductor switch device, a diode and a direct current capacitor, wherein the first power semiconductor switch device is connected with the diode in series, and the connection modes include the following two modes:
connection mode 1: the cathode of the diode is connected with the anode of the direct current capacitor, the anode of the diode is connected with the collector of the first power semiconductor switching device, and the emitter of the first power semiconductor switching device is connected with the cathode of the direct current capacitor;
connection mode 2: the collector of the first power semiconductor switch device is connected with the positive electrode of the direct current capacitor, the emitter of the first power semiconductor switch device is connected with the cathode of the diode, and the anode of the diode is connected with the negative electrode of the direct current capacitor;
the collector of the first power semiconductor switch device is used as a positive electrode leading-out point, and the emitter of the first power semiconductor switch device is used as a negative electrode leading-out point;
when the device detects an overvoltage on the dc line, the method comprises the steps of:
step 1: the device detects the voltage of a direct current line in real time, and is in a standby mode when the voltage of the direct current line does not exceed an upper limit value Umax;
step 2: when the voltage of the direct current line exceeds an upper limit value Umax, the device is in an energy consumption mode, and the step 3 is carried out;
and step 3: sequentially conducting first power semiconductor switching devices in the energy consumption sub-modules, wherein the conduction interval time is t;
and 4, step 4: after all the first power semiconductor switching devices are conducted, maintaining the state for a time length of T1;
and 5: detecting the voltage of a direct current line, and sequentially turning off first power semiconductor switching devices in the energy consumption submodules when the voltage of the direct current line is lower than a lower limit value Umin, wherein the turn-off interval time is t 3;
step 6: after all the first power semiconductor switching devices are turned off, maintaining the state for a time length of T2;
and 7: in the energy consumption mode, once the voltage of the energy consumption sub-module is detected to exceed the maximum tolerance value, the first power semiconductor switch device is immediately conducted.
2. The control method based on the chained energy consumption device as claimed in claim 1, wherein: and the diodes in the energy consumption sub-modules are also connected with a second power semiconductor switching device in parallel in an opposite direction.
3. The control method based on the chained energy consumption device as claimed in claim 1, wherein: the energy dissipation resistor is also connected in parallel with a voltage clamping unit consisting of diodes.
4. The control method based on the chained energy consumption device as claimed in claim 1, wherein: the energy consumption sub-module is also connected with a bypass switch in parallel.
5. The control method based on the chained energy consumption device as claimed in claim 1, wherein: the energy consumption branch of the chain type energy consumption device is also connected with at least one charging unit in series, and the charging unit is formed by connecting a charging resistor and a charging switch in parallel.
6. The control method based on the chained energy consumption device as claimed in claim 5, wherein: the chain type energy consumption device is also connected with at least one partition switch in series.
7. The control method based on the chained energy consumption device as claimed in claim 1, wherein: the energy dissipation resistor is replaced by an energy accumulator, and the energy accumulator has charge and discharge capacity.
8. The control method based on the chained energy consumption device as claimed in claim 1, wherein: the energy consuming sub-module includes only a mechanical switch.
9. The control method based on the chained energy consumption device as claimed in claim 6, wherein: when the device is started, the method comprises the following steps:
step 1: the power semiconductor switch device in the energy consumption submodule is turned off, the charging switch is separated, and the isolating switch is separated;
step 2: after the direct current circuit is electrified, closing the isolating switch, and charging a direct current capacitor in the energy consumption submodule through a charging resistor;
and step 3: and after the charging is finished, closing the charging switch and bypassing the charging resistor.
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| CN112187029A (en) * | 2019-07-05 | 2021-01-05 | 西安许继电力电子技术有限公司 | Direct current energy consumption device |
| CN113452059A (en) * | 2020-03-25 | 2021-09-28 | 许继电气股份有限公司 | Offshore wind power direct current sending-out system with direct current energy consumption function and control method |
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