CN106885961A - MMC HVDC black starting-ups simulation experiment systems and test method - Google Patents
MMC HVDC black starting-ups simulation experiment systems and test method Download PDFInfo
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- CN106885961A CN106885961A CN201710142799.1A CN201710142799A CN106885961A CN 106885961 A CN106885961 A CN 106885961A CN 201710142799 A CN201710142799 A CN 201710142799A CN 106885961 A CN106885961 A CN 106885961A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The present invention relates to MMC HVDC black starting-ups simulation experiment systems and test method, simulated test switch is disconnected first, simulate one of electrical breakdown, and corresponding two breakers of two power networks of disconnection；Then two chargings and start-up operation of MMC are carried out, after the alternating-voltage stabilization of the corresponding MMC outputs of power network of last dead electricity, detect the voltage magnitude and phase of the second power network, and the voltage-phase to the second power network enters horizontal lock, when the voltage-phase of the second power network is consistent with the phase of the alternating voltage that the 2nd MMC is exported, control the second breaker of closure to carry out grid-connected, realize the simulated test of black starting-up.So; the test method can simulate the black starting-up that power network is effectively realized when power network breaks down; realize the effective control to MMC HVDC black starting-ups; and black starting-up performance study can be carried out to flexible direct current power transmission system, to instruct product development of the transverter with Control protection system and engineering construction.
Description
Technical field
The present invention relates to a kind of MMC-HVDC black starting-ups simulation experiment system and test method.
Background technology
With the application of the development and Power Electronic Technique of all-controlling power electronics device in power system, based on voltage
High voltage dc transmission technology (the Voltage-Sourced Converter High Voltage Direct of source transverter
Current, VSC-HVDC) it is increasingly subject to pay attention to.Modularization multi-level converter (MMC, Modular Multilevel
Converter) be voltage source converter in flexible direct current power transmission system application one kind, be widely used in its significant advantage
Flexible DC power transmission and new energy access system.
Realize that the research of power grid"black-start" is received significant attention as black starting-up power supply using VSC-HVDC.It is so-called black to open
It is dynamic, refer to that after whole system hinders stoppage in transit for some reason, system all has a power failure (be not excluded for isolated minor scale power net and still maintain operation), in complete
" black " state, is independent of other web help, is started by the generating set with self-startup ability in system, drives nothing to open certainly
The generating set of kinetic force, gradually expands system and recovers scope, finally realizes the recovery of whole system.Compared to using in system
The generating set of self-startup ability carry out black starting-up, MMC transverters have a clear superiority as black starting-up power supply, and it does not exist
Black starting-up unit self-excitation problem, and, can control to make alternating voltage change by setting curve by soft start, it is to avoid non-loaded line
Road closing overvoltage problem.
First, in the prior art for MMC black start-up ability research also in starting stage, and existing utilization
The Starting mode that MMC carries out power grid"black-start" is that this mode is only real in real MMC-HVDC transmission systems
Transmission system in implement after can show the Starting mode correctness, but a kind of if Starting mode mistake
Mode, then, this can not only cause the failure of black starting-up, due to carrying out black starting-up in real MMC-HVDC transmission systems,
So, once black starting-up fails, will have a power failure in large area in power supply area, huge economic damage can be caused to enterprise's production
Lose, very big inconvenience is brought to resident's daily life.
When MMC-HVDC is used for power grid"black-start", power failure end can be equivalent to passive network, now need by there is source
The startup of current conversion station is realized, the recovery of whole power network is then driven.For one-port, (I ends have been equivalent to source current conversion station system
System, II ends are dead terminal current conversion station system), II ends have a power failure on a large scale then two ends current conversion station while out of service.
The content of the invention
It is an object of the invention to provide a kind of MMC-HVDC black starting-ups simulation experiment system and test method.
To achieve the above object, the solution of the present invention includes：A kind of MMC-HVDC black starting-ups simulation experiment system, its feature
It is, including I ends current conversion station system and II current conversion station systems, the I ends current conversion station system is including a MMC and for controlling
First control system of a MMC is stated, the II ends current conversion station system includes the 2nd MMC and for controlling the 2nd MMC's
Second control system, the DC side of a MMC connects the DC side of the 2nd MMC, described first by line simulation device
The AC of MMC is used to connect the first power network, and the AC of the 2nd MMC is used to connect the second power network, the exchange of a MMC
String is provided with the first breaker on connection line between side and the first power network, between the AC and the second power network of the 2nd MMC
String is provided with the second breaker on connection line, and string is provided with simulation on the connection line between second breaker and the second power network
Test switch, the line simulation device is used to simulate the reality between the DC side and the DC side of the 2nd MMC of a MMC
Border transmission line.
The simulation experiment system also includes first switch, second switch and the 3rd switch, and first power network passes through institute
State first switch to power connection first control system, second power network is by the described 3rd switch power supply one electricity of connection
Motivation, the motor and a generator mechanical drive connection, the electric energy output end of the generator are connected to a conversion
One movable contact of switch；Tie point between second breaker and simulated test switch is connected by the second switch
Another movable contact of the change-over switch, the stationary contact of the change-over switch is powered and connects second control system.
Also string is provided with the first soft starting device on connection line between the AC and the first power network of the first MMC,
Also string is provided with the second soft starting device on connection line between the AC and the second power network of the 2nd MMC.
The line simulation device includes first resistor group, the first inductive bank, second resistance group, the second inductive bank, first
Capacitance group, the second capacitance group, the 3rd capacitance group and the 4th capacitance group, electrode input end and the positive pole of the line simulation device are exported
String sets the first resistor group and the first inductive bank between end, the negative input and cathode output end of the line simulation device it
Between string set the second resistance group and the second inductive bank, between the electrode input end and negative input of the line simulation device
String is provided with the first capacitance group and the 3rd capacitance group on connection line, on the connection line between cathode output end and cathode output end
String is provided with the second capacitance group and the 4th capacitance group, tie point and the second capacitance group between the first capacitance group and the 3rd capacitance group and
Tie point ground connection between 4th capacitance group；The first resistor group and second resistance group are by least one rheostat series connection structure
Into first inductive bank and the second inductive bank are a controllable impedance for having several taps, first capacitance group,
At least one of two capacitance groups, the 3rd capacitance group and the 4th capacitance group capacitance group is for an electric capacity or by least two electric capacity
Parallel connection is constituted.
A kind of MMC-HVDC black starting-up simulation experiment methods for being exclusively used in above-mentioned MMC-HVDC black starting-ups simulation experiment system,
Comprise the following steps：
(1) simulated test switch, is disconnected, the second electrical breakdown is simulated, and disconnect the first breaker and the second breaker；
(2) the first breaker, active startup the MMC, are closed, the 2nd MMC is in passive starting state, a MMC and
Submodule in 2nd MMC is started to charge up；
(3), after the submodule charging complete in a MMC and the 2nd MMC, a MMC is unlocked, and control startup first
MMC；
(4), after after the DC voltage stability of a MMC DC sides, the 2nd MMC is unlocked, and controls to start the 2nd MMC；
(5), after the alternating-voltage stabilization of the 2nd MMC outputs, the voltage magnitude and phase of the second power network are detected, and to the
The voltage-phase of two power networks enters horizontal lock, when the phase one of the alternating voltage that the voltage-phase of the second power network and the 2nd MMC are exported
During cause, control the second breaker of closure to carry out grid-connected, realize the simulated test of black starting-up.
Between the step (1) and step (2), the test method is further comprising the steps of：Closure first switch and
3rd switch, makes the first power network by first switch for the first control system is powered, and makes the electric energy that generator sends by conversion
Switch as the second control system is powered.
In the step (5), when the alternating-voltage stabilization of the 2nd MMC outputs, closure simulated test switch and the
Two switches, disconnect the 3rd and switch, and simulated test is switched and second switch is the to pass sequentially through the second power network by change-over switch
Two control systems are powered.
In the step (3), when the control starts a MMC, a MMC is to determine DC voltage, determine reactive power control
Molding formula；In the step (4), when the control starts two MMC, the 2nd MMC is controlled to determine alternating voltage, determining a-c cycle
Pattern.
In the step (4), when the 2nd MMC is to determine alternating voltage, determine the operation of a-c cycle control model, control second
The alternating voltage of MMC ACs increases according to the rate of voltage rise of setting.
The present invention provides a kind of MMC-HVDC black starting-ups simulation experiment system, and the pilot system can be to the black of MMC-HVDC
Startup ability is simulated experiment, it is not necessary to specially black starting-up test is carried out in real MMC-HVDC transmission systems, using this
Pilot system can promptly and accurately know the black start-up ability of MMC-HVDC, and, even if the black startup test failure of simulation,
Serious consequence will not be produced, it is to avoid in the power supply area that real MMC-HVDC transmission systems are caused when black starting-up fails
Large-area power-cuts.
And, the black starting-up simulation experiment method that the present invention is provided is that the analog study of MMC-HVDC black starting-ups is obtained,
When carrying out black startup test using the pilot system, simulated test switch is disconnected first, simulate one of electrical breakdown, and break
Open corresponding two breakers of two power networks；Then two chargings and start-up operation of MMC, the power network correspondence of last dead electricity are carried out
MMC outputs alternating-voltage stabilization after, the voltage magnitude and phase of the second power network are detected, and to the voltage-phase of the second power network
Enter horizontal lock, when the voltage-phase of the second power network is consistent with the phase of the alternating voltage that the 2nd MMC is exported, control closure second
Breaker carries out grid-connected, realizes the simulated test of black starting-up.So, the test method can be simulated to be had when power network breaks down
Effect realizes the black starting-up of power network, realizes the effective control to MMC-HVDC black starting-ups, and can be to flexible direct current power transmission system
Black starting-up performance study is carried out, to instruct product development of the transverter (valve) with Control protection system and engineering construction.
Brief description of the drawings
Fig. 1 is MMC-HVDC black starting-up simulation experiment system structural representations；
Fig. 2 is the structural representation of one of implementation method of change-over switch；
Fig. 3 is MMC structural representations；
Fig. 4-a are the structural representations of half-bridge submodule；
Fig. 4-b are the structural representations of full-bridge submodule；
Fig. 4-c are the structural representations of clamp formula Shuangzi module；
Fig. 5 is the structural representation of line simulation device.
Specific embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Embodiment 1
As shown in figure 1, MMC-HVDC black starting-ups simulation experiment system includes I ends current conversion station system and II current conversion station systems, I
End current conversion station system connects II current conversion station systems by line simulation device, wherein, the core in I ends current conversion station and II ends current conversion station
Center portion point is MMC, is respectively MMC1 and MMC2.I ends current conversion station system and II current conversion stations system are real transverter systems
System, the power network in I ends current conversion station system and II current conversion station systems is real power network.
First has been sequentially connected in series on connection line between the AC of the MMC1 in the first power network and I ends current conversion station system
Between the AC and simulating grid of the MMC2 in circuit breaker Q F1, the first soft starting device and transformer T1, II current conversion station system
Connection line on be sequentially connected in series transformer T2, the second soft starting device, the second circuit breaker Q F2 and simulated test switch K4.
Also include the first control system for controlling MMC1 in the current conversion station system of I ends, also wrapped in the current conversion station system of II ends
Include the second control system for controlling MMC2.First power network connects the feeder ear of the first control system by first switch K1；
As shown in figure 1, the tie point between the second circuit breaker Q F2 and simulated test switch K4 connects change-over switch by second switch K2
A movable contact, simulating grid supplies electrical connection electric motor M, motor M and generator G machine drivings by the 3rd switch K3
Connection, the electric energy output end of generator G connects another movable contact of change-over switch.Motor M and generator G are single-phase electricity
Machine, the stationary contact of change-over switch connects the feeder ear of the second control system, and generator G can provide work for the second control system
Voltage.As shown in Fig. 2 give a specific embodiment of change-over switch, its equivalent to a single-pole double-throw switch (SPDT), wherein,
D1 is stationary contact, and d2 and d3 is two movable contacts, by select d1 and d2 to turn on or d1 and d3 turn on can make switch beat to
Second switch K2 or generator G.In addition, it is generally the case that control system is put with the cooling system for being cooled down to MMC
Put at one piece, when being powered for control system, also correspondingly for cooling system is powered, cooling system belongs to conventional
Technology, prior art is belonged on its concrete structure and the course of work, and, this implementation unrelated with technical scheme
Example is not described in detail.
As shown in figure 3, the MMC1 and MMC2 in the pilot system are six bridge arm MMC, per mutually including upper and lower two bridges
Arm, the submodule on each bridge arm is not limited to half-bridge submodule as depicted in fig. 4-a, or as shown in Fig. 4-b
Full-bridge submodule and the clamp formula Shuangzi module as shown in Fig. 4-c, in addition, the switching element T 0, T1 in these three submodules,
T2, T3, T4, T5, T6, T11, T12, T21, T22 are not limited to IGBT device, can also be MOSFET element or other complete
Control type switching device or half control type switching device, are considered with adapting to different voltage power grades and reducing system cost.
As shown in figure 5, line simulation device is used to realize to (several kilometers) framves to (thousands of miles) over long distances of short distance
The simulation of the flexible DC power transmission circuit of ceases to be busy, cable and trolley line+cable series-parallel connection.The structure of the line simulation device and multiple
Miscellaneous degree is configured according to actual conditions.The present embodiment provides a specific embodiment, it on the whole by equivalent resistance, etc.
Effect inductance and equivalent capacity composition, specifically include first resistor group R1, the first inductive bank L1, second resistance group R2, the second inductance
Group L2, the first capacitance group C1, the second capacitance group C2, the 3rd capacitance group C3 and the 4th capacitance group C4.The line simulation device is just
String sets first resistor group R1 and the first inductive bank L1, negative input and cathode output end between pole input and cathode output end
Between string set second resistance group R2 and the second inductive bank L2；Between the electrode input end and negative input of the line simulation device
Connection line on string set the first capacitance group C1 and the 3rd capacitance group C3, the connecting line between cathode output end and cathode output end
String sets the second capacitance group C2 and the 4th capacitance group C4 on road, wherein, the connection between the first capacitance group C1 and the 3rd capacitance group C3
Point and the ground connection of the tie point between the second capacitance group C2 and the 4th capacitance group C4.R1 and R2 are by least one for the two resistance groups
Rheostat is in series, by the change for correspondingly adjusting the resistance that can realize whole resistance group；First inductive bank and second
Inductive bank is a controllable impedance for having several taps, and the change of inductance value is realized by the regulation of tap；First electric capacity
At least one of group, the second capacitance group, the 3rd capacitance group and the 4th capacitance group capacitance group is an electric capacity, or by least two
Individual electric capacity is in parallel to be constituted, and by putting into or cutting off the electric capacity of different numbers, realizes the change of the capacitance of each capacitance group.It is comprehensive
On, by regulation, the resistance value in the line simulation device, inductance value and capacitance can be made correspondingly to be changed, namely
Realized to different length, the simulation of different type transmission line of electricity by the value to different electric component gears.
, it is necessary to carry out following preparation before black starting-up simulation experiment method is carried out using the pilot system：
First by I ends, II ends killer switch QF1, QF2 disconnect, MMC1 and MMC2 lockings access line simulation device
System, resistance value, inductance value and capacitance in adjusting circuit analogue means simulate different DC line length.Specifically
For：Change resistance group R1, R2 in resistance, and L1, L2 tap wiring, thus it is possible to vary in access system resistance value and
Inductance value；Changing shunt capacitance number can change capacitor's capacity in access system, and different resistance, inductance and capacitor combination exist
Together, can it is equivalent go out different transmission line of electricity.
Black starting-up simulation experiment method, specially following steps are carried out using the pilot system：
1st, simulated test switch K4 is disconnected, II end system electrical breakdowns, and cut-off breaker switch QF1 and QF2 is simulated.
2nd, closure first switch K1, I end control system is powered with cooling system and in normal operating conditions；I ends control
After system and cooling system normal work, it is both-end HVDC operational modes to set the control of I ends pole, active startup, pole connection status, and
Set I ends to be constant DC voltage control, determine Reactive Power Control pattern, that is, it is voltage-controlled to determine direct current that the control model of MMC1 is set
Make, determine Reactive Power Control pattern.
Close the 3rd switch K3, disconnect second switch K2, power network provides electric energy for single-phase motor M, motor M operate into
And generator G is driven, generator sends single-phase 220V alternating currents, and makes generator G be II end control systems by change-over switch
Electric energy is provided with cooling system.
After II end control systems are in normal operating conditions with cooling system, it is passive startup mould to set II ends pole control system
Formula, and set II ends be determine alternating voltage, the control model of determining a-c cycle control model, i.e. MMC2 is to determine alternating voltage, calmly
A-c cycle control model.
3rd, I ends pole control issues startup order, and circuit breaker Q F1 closures, end I system is in active soft start state, in MMC1
Submodule start to charge up；II systems are held to be in passive starting state simultaneously, the submodule in MMC2 is started to charge up.
The double ended system charging stage is comprising uncontrollable rectifier and determines the DC voltage charging stage.In the charging stage, to keep son
Module voltage uniformity, practicable soft opening press strategy (using switching KM1, KM2 and resistance in parallel with KM1 and KM2 realization
Soft start), i.e., in the charging stage, capacitance voltage highest submodule is in excision state, and excision number and excision speed receive submodule
Block capacitor charge and discharge characteristic influences.When submodule voltage in MMC1 reaches setting value, pole control performs the soft contactor KM1 that opens and closes
Strategy, resistance excision is opened by soft.
4th, after the submodule capacitor voltage stabilization in MMC1 and MMC2, i.e., after charging complete, pole control issues unlocking command, I
End system is unlocked, that is, MMC1 is unlocked, because the control mode above to I end systems has carried out prior setting, so straight here
The MMC1 for connecing control I end systems is in constant DC voltage control, determines Reactive Power Control pattern, i.e., in reactive power according to fixation
Slope is slowly risen to from zero and be controlled with the reactive power definite value after certain value.
After MMC1 starts, the DC terminal voltage of DC side is gradually increasing, when the DC voltage of the DC side of MMC1 reaches
The DC voltage value can be stable at during the DC voltage value of setting, at this moment, the unblock of II end systems unlocks MMC2, similarly, by
Prior setting is carried out in the control mode above to II end systems, so directly the MMC2 of control II end systems is in here
Determine alternating voltage control, determine a-c cycle control model.Pole control sets the alternating voltage of MMC2 ACs output according to setting
Slope realizes the soft start to transformer from zero slow rising.
5th, the alternating voltage of MMC2 ACs is gradually increasing, and the exchange can be stable at when the ac voltage of setting is reached
Magnitude of voltage, at this moment, closure simulated test switch K4 and second switch K2, change-over switch is realized that the seamless of power supply takes over seamlessly, is made
II end control systems and cooling system power supply are powered by generator G and are converted into power network by second switch offer, after power good,
Disconnect the 3rd switch K3.
6th, the amplitude and phase of II ends pole control detection II ends line voltage, II ends power network electricity is locked by software phase-lock loop
The phase of pressure, when the phase of II ends line voltage is consistent with the alternating voltage phase that MMC2 is exported, issues circuit breaker Q F2 closures
Order, implements grid-connected.
So far completed based on MMC-HVDC black starting-ups physical simulation experiment.
In above-described embodiment, before circuit breaker Q F1 closures, setting MMC1 is constant DC voltage control, determines reactive power
Control, MMC2 determines a-c cycle control to determine alternating voltage, and the control model of MMC1 and MMC2 is merely just set in advance,
Do not carry out practical operation control to it, and reality is carried out respectively to it again after submodule charging complete in two MMC
Control, so, the control model of the two MMC can in advance be set in any time before actual control, certainly, also
Can be configured while actually control.And, constant DC voltage control, determine the control model of Reactive Power Control and fixed
Alternating voltage, the control model for determining a-c cycle control belongs to the ordinary control mode of MMC, and just no longer the two are controlled here
Molding formula is explained in itself.
In above-described embodiment, the first and second soft starting devices are the technical characteristic of further optimization, certainly, as it
His embodiment, the two soft starting devices can be omitted, and similarly, the transformer in the simulation experiment system can not also
Set.
Embodiment 2
Compared with above-described embodiment, in the embodiment, MMC-HVDC black starting-ups simulation experiment system include motor and
Generator, then the mode that II end control systems are powered only has one kind --- power network, correspondingly, change-over switch need not just be set,
So, in the black starting-up simulation experiment method based on the system just the power supply without II end control systems switching correlation
Step.
So, based on the simulation experiment system in the present embodiment, black starting-up simulation experiment method is integrally comprised the following steps：
(1), disconnect simulated test switch K4, simulate II end system electrical breakdowns, and cut-off breaker switch QF1 and
QF2；
(2), close circuit breaker QF1, active startup MMC1, passive startup MMC2, the submodule BOB(beginning of block) in the two MMC fills
Electricity；
(3), after the submodule charging complete in MMC1 and MMC2, MMC1 is unlocked, and controls to start MMC1；
(4), after after the DC voltage stability of MMC1 DC sides, MMC2 is unlocked, and controls to start MMC2；
(5), after the alternating-voltage stabilization of MMC2 outputs, the voltage magnitude and phase of detection II ends power network, and to II ends
The voltage-phase of power network enters horizontal lock, when the voltage-phase of II ends power network is consistent with the phase of the alternating voltage that MMC2 is exported,
Control close circuit breaker QF2 to carry out grid-connected, realize the simulated test of black starting-up.
Due in embodiment 1 to above-mentioned test method in each step be described in detail, just no longer have here
Body explanation.
Specific embodiment is presented above, but the present invention is not limited to described implementation method.Base of the invention
This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, various changes are designed in teaching of the invention
The model of shape, formula, parameter simultaneously need not spend creative work.It is right without departing from the principles and spirit of the present invention
Change, modification, replacement and the modification that implementation method is carried out are still fallen within protection scope of the present invention.
Claims (9)
1. a kind of MMC-HVDC black starting-ups simulation experiment system, it is characterised in that including I ends current conversion station system and II current conversion stations system
System, the I ends current conversion station system includes a MMC and the first control system for controlling a MMC, and the II ends are changed
Stream station system includes the 2nd MMC and the second control system for controlling the 2nd MMC, and the DC side of a MMC leads to
The DC side that line simulation device connects the 2nd MMC is crossed, the AC of a MMC is used to connect the first power network, the 2nd MMC
AC be used for connect the second power network, gone here and there on the connection line between the AC and the first power network of a MMC and be provided with
First breaker, string is provided with the second breaker, described second on the connection line between the AC and the second power network of the 2nd MMC
String is provided with simulated test switch on connection line between breaker and the second power network, and the line simulation device is used to simulate institute
State the actual transmissions circuit between the DC side of a MMC and the DC side of the 2nd MMC.
2. MMC-HVDC black starting-ups simulation experiment system according to claim 1, it is characterised in that the simulated test system
System also includes first switch, second switch and the 3rd switch, and first power network is powered described in connection by the first switch
First control system, second power network is by the described 3rd switch power supply one motor of connection, the motor and one
Generator mechanical is connected, and the electric energy output end of the generator is connected to change-over switch movable contact；It is described
Tie point between second breaker and simulated test switch passes through another of the second switch connection change-over switch
Movable contact, the stationary contact of the change-over switch is powered and connects second control system.
3. MMC-HVDC black starting-ups simulation experiment system according to claim 1 and 2 a, it is characterised in that MMC
AC and the first power network between connection line on also string be provided with the first soft starting device, the AC of the 2nd MMC and the
Also string is provided with the second soft starting device on connection line between two power networks.
4. MMC-HVDC black starting-ups simulation experiment system according to claim 1 and 2, it is characterised in that the circuit mould
Intend device include first resistor group, the first inductive bank, second resistance group, the second inductive bank, the first capacitance group, the second capacitance group,
3rd capacitance group and the 4th capacitance group, string sets described first between the electrode input end and cathode output end of the line simulation device
Resistance group and the first inductive bank, string sets the second resistance between the negative input and cathode output end of the line simulation device
Group and the second inductive bank, string is provided with the on the connection line between the electrode input end and negative input of the line simulation device
One capacitance group and the 3rd capacitance group, on the connection line between cathode output end and cathode output end string be provided with the second capacitance group and
4th capacitance group, the tie point between the first capacitance group and the 3rd capacitance group and the company between the second capacitance group and the 4th capacitance group
Contact is grounded；The first resistor group and second resistance group are in series by least one rheostat, first inductive bank
A controllable impedance for there are several taps, first capacitance group, the second capacitance group, the 3rd electric capacity are with the second inductive bank
At least one of group and the 4th capacitance group capacitance group are an electric capacity or are made up of at least two electric capacity parallel connections.
5. a kind of MMC-HVDC black starting-ups simulation examination for being exclusively used in MMC-HVDC black starting-ups simulation experiment system described in claim 1
Proved recipe method, it is characterised in that comprise the following steps：
(1) simulated test switch, is disconnected, the second electrical breakdown is simulated, and disconnect the first breaker and the second breaker；
(2) the first breaker, is closed, active startup a MMC, the 2nd MMC are in passive starting state, a MMC and second
Submodule in MMC is started to charge up；
(3), after the submodule charging complete in a MMC and the 2nd MMC, a MMC is unlocked, and controls to start a MMC；
(4), after after the DC voltage stability of a MMC DC sides, the 2nd MMC is unlocked, and controls to start the 2nd MMC；
(5), after the alternating-voltage stabilization of the 2nd MMC outputs, the voltage magnitude and phase of the second power network are detected, and to the second electricity
The voltage-phase of net enters horizontal lock, when the voltage-phase of the second power network is consistent with the phase of the alternating voltage that the 2nd MMC is exported,
Control the second breaker of closure to carry out grid-connected, realize the simulated test of black starting-up.
6. MMC-HVDC black starting-ups simulation experiment method according to claim 5, it is characterised in that in the step (1)
And step (2) between, the test method is further comprising the steps of：Closure first switch and the 3rd switch, lead to the first power network
First switch is crossed for the first control system is powered, makes the electric energy that generator sends by change-over switch for the second control system is supplied
Electricity.
7. MMC-HVDC black starting-ups simulation experiment method according to claim 6, it is characterised in that in the step (5),
When the alternating-voltage stabilization of the 2nd MMC outputs, closure simulated test is switched and second switch, is disconnected the 3rd and is switched, and is led to
Crossing change-over switch makes the second power network pass sequentially through simulated test switch and second switch for the second control system is powered.
8. MMC-HVDC black starting-ups simulation experiment method according to claim 5, it is characterised in that in the step (3),
When the control starts a MMC, a MMC is to determine DC voltage, determine Reactive Power Control pattern；In the step (4), institute
When stating control two MMC of startup, the 2nd MMC is to determine alternating voltage, determine a-c cycle control model.
9. MMC-HVDC black starting-ups simulation experiment method according to claim 8, it is characterised in that in the step (4),
When the 2nd MMC is to determine alternating voltage, determine the operation of a-c cycle control model, the alternating voltage of the 2nd MMC ACs is controlled to press
According to the rate of voltage rise increase of setting.
Priority Applications (1)
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