CN203491710U - Multi-circuit DC emergency power modulating system based on PMU - Google Patents
Multi-circuit DC emergency power modulating system based on PMU Download PDFInfo
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- CN203491710U CN203491710U CN201320265132.8U CN201320265132U CN203491710U CN 203491710 U CN203491710 U CN 203491710U CN 201320265132 U CN201320265132 U CN 201320265132U CN 203491710 U CN203491710 U CN 203491710U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The utility model relates to a multi-circuit DC emergency power modulating system based on a PMU. The modulating system comprises sensors, PMU devices, a GPS, a control master station, and signal transmitters. The PMU devices are connected with convertor stations through the sensors. The control master station is respectively connected with the PMU devices and the signal transmitters in a communication manner. The GPS is connected with the PMU devices. The signal transmitters are connected with the convertor station. The PMU devices performs real-time sampling on the convertor stations, calculates voltage phasor value and corresponding power, outputs phasor data, and transmits phasor data with time mark to the control master station according to clock signals of the GPS. The control master station calculates a modulating power control signal of each circuit DC transmission system, and each convertor station performs power modulation according to the modulating power control signal. Compared with the prior art, the system is characterized by improving stability of operation of an electric system, and good modulation effect.
Description
Technical field
The utility model relates to a kind of power modulation system, especially relates to a kind of urgent power modulation system of many times direct currents based on PMU.
Background technology
Along with the development of electric power system, high voltage direct current becomes the major part that electrical network is entered electric weight, and the safe operation of direct current system is increasing to the importance of electrical network.The response of HVDC (high-voltage direct current, high voltage direct current) is quick, controllable degree is high, pondage is large, across characteristics such as region are wide, for improving the dynamic property of system, provide strong means.Because many times DC transmission system are according to the system condition independent design of different times. do not consider each other the exchange of operation and control information and the control of coordination.Therefore the reaction that each time DC transmission system disturbed AC system after putting into operation likely forms the situation of " doing things in his own way ", sometimes even weaken the dynamic property of original power system, be necessary to inquire between DC transmission system and with AC system coordination control strategy and algorithm.If the controlling unit of many times direct currents of energy coordination optimization electrical network, introduce new control signal, completely likely by excavating the potentiality of direct current, promote the dynamic property of whole alternating current-direct current electrical network, dwindle the imbalance power after direct current locking between sending end and receiving end, improve the transient stability of ac and dc systems and the damping that improves inter-area oscillation.
By the difference of controlling target, the control of DC transmission system is divided into 2 classes: it is the control for guaranteeing that the normal operation of DC transmission system adopts that a class is controlled, as determine electric current, determine power and determine gamma kick etc., its target is the transmission power that remains constant, reduce the harmonic wave that direct current system produces, guarantee the reactive power exchange power of DC transmission system and AC system within the limits prescribed; Another kind of control (being called modulation control) realizes by AC system, and main target is to improve transient characterisitics and the stability that is attached thereto AC system, and modulation control mainly contains power modulation and the large class of frequency modulation(FM) two.In order to improve the stability of operation of power networks, be necessary the power modulation of many times direct currents to coordinate to study.
Summary of the invention
The purpose of this utility model is exactly that a kind of power system operation stability, urgent power modulation system of many times direct currents based on PMU that modulation effect is good of improving is provided in order to overcome the defect that above-mentioned prior art exists.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of urgent power modulation system of many times direct currents based on PMU, for many times DC transmission system are carried out to power modulation coordination, described DC transmission system comprises current conversion station, described modulating system comprises transducer, PMU device, GPS, controlling center and sender unit, described PMU device is connected with current conversion station by transducer, described controlling center communicates to connect with PMU device, sender unit respectively, described GPS is connected with PMU device, and described sender unit is connected with current conversion station.
Described transducer comprises voltage sensor and current sensor.
Described PMU device is provided with a plurality of.
Described controlling center comprises receiver module, data processing module, memory module and sending module, described data processing module connects respectively receiver module, memory module and sending module, described receiver module and the communication connection of PMU device, described sending module and sender unit communication connection.
Compared with prior art, the utlity model has following advantage:
1) the utility model is realized the power coordination between many times DC transmission system by PMU device, improved the operation stability of electric power system, for the serious fault that causes system unit shut algorithm, utilize the overload capacity of many times DC equipment, promote direct current transmission power, maintain give, dynamic stability and the power balance of receiving end AC system, reduced the quantity that after fault, sending end system is cut generator or receiving end cutting load, and guaranteed original transmission of electricity plan, there is significant economic benefit;
2) the modulation power control signal computational methods that the utility model adopts are simply effective, and modulation effect is good.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the principle schematic that calculates the modulation power control signal of each time DC transmission system.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.The present embodiment be take technical solutions of the utility model and is implemented as prerequisite, provided detailed execution mode and concrete operating process, but protection range of the present utility model is not limited to following embodiment.
As shown in Figure 1, a kind of urgent power modulation system of many times direct currents based on PMU, for many times DC transmission system are carried out to power modulation coordination, described DC transmission system comprises current conversion station 1, described modulating system comprises transducer 2, PMU device 3, GPS4, controlling center 5 and sender unit 6, described PMU device 3 is connected with current conversion station 1 by transducer 2, described controlling center 5 communicates to connect with PMU device 3, sender unit 6 respectively, described GPS4 is connected with PMU device 3, and described sender unit 6 is connected with current conversion station 1.Described transducer 2 comprises voltage sensor and current sensor.Described PMU device 3 is provided with a plurality of.Current conversion station comprises converting plant and Inverter Station.
Described controlling center 5 comprises receiver module, data processing module, memory module and sending module, described data processing module connects respectively receiver module, memory module and sending module, described receiver module and 3 communication connections of PMU device, described sending module and sender unit 6 communication connections.
The operation principle of the above-mentioned many times urgent power modulation systems of direct current based on PMU comprises the following steps:
1) PMU device 3 carries out real-time sampling by the voltage and current signal of 2 pairs of each current conversion stations 1 of transducer;
2) PMU device 3, according to sampled signal calculating voltage phasor value and corresponding power, is exported phasor data;
3) GPS4 sends present clock signals to PMU device 3, and PMU device 3 is stamped markers according to clock signal by phasor data, and will with time target phasor data packings send to controlling center 5;
4) receiver module of controlling center 5 is transferred to data processing module after receiving phasor data, data processing module calculates the modulation power control signal of each time DC transmission system according to phasor data, and modulation power control signal is sent to sending module, result of calculation and phasor data are saved in memory module simultaneously;
5) sending module sends to current conversion station 1 by sender unit 6 by modulation power control signal, and each current conversion station carries out the power modulation of DC transmission system according to the modulation power control signal receiving.
Be illustrated in figure 2 the principle schematic of the modulation power control signal that calculates each time DC transmission system.In Fig. 2, P
nrepresent the transmission power of direct current n before locking, P
n1represent the transmission power of the direct current n utmost point 1 before locking, P
n2represent the transmission power of the direct current n utmost point 2 before locking, when direct current normally moves, running status is 1, and when direct current locking, running status is 0, P
sfor total power shortage, Δ P
n1for the modulation power of the direct current n utmost point 1, Δ P
n2for the modulation power of the direct current n utmost point 2, Δ P
nfor the total modulation power of direct current n, allow the urgent power modulation coordination function of signal indication direct current whether to drop into.
The urgent power coordination of direct current is controlled power shortage is shared to the direct current that has nargin to other, the share that each direct current is born is directly proportional to its nargin, if while there is one pole locking, direct current carries power control loop joint Partial Power is transferred to an other utmost point, therefore in power shortage, needs to cut the power that is transferred to an other utmost point.
Described step 4) the modulation power control signal that in, data processing module calculates each time DC transmission system according to phasor data is specially:
A) data processing module obtains the power signal of each DC transmission system by receiver module;
B) data processing module judges whether to carry out urgent power modulation function according to current power signal, if so, performs step c), if not, return to step a);
C) calculate each modulation power control signal:
If k returns the direct current utmost point 1, locking occurs, n returns the modulation power formula of direct current utmost point j and is:
In formula, P
maxnjfor the maximum delivery power of direct current n utmost point j, P '
njfor direct current n utmost point j current power, S
njfor the running status of direct current n utmost point j, x is number of poles, and m is that total DC transmission system is returned number, P '
k2-P
k2for being transferred to the power of the direct current k utmost point 2.
The object of many times direct current combined modulations is to improve the operation stability of electric power system.For the serious fault that causes system unit shut algorithm, utilize the overload capacity of many times DC equipment, promote direct current transmission power, maintain give, dynamic stability and the power balance of receiving end AC system, reduced the quantity that after fault, sending end system is cut generator or receiving end cutting load, and guaranteed original transmission of electricity plan, there is significant economic benefit.
Take Shanghai Power Network as example explanation concrete implementation result of the present utility model.
The specified transmission capacity of several times direct currents in Shanghai and East China and support ability are as shown in table 1, visible, and Shanghai and East China direct current have higher support ability, and it is quite necessary and significant utilizing the advantage raising operation of power networks maintenance level that direct current transportation is controlled fast.
Several times direct current overviews in table 1 Shanghai and East China
Before three Hua Lian nets, East China Power Grid and Central China Power Grid are by DC asynchronous networking, if summer one time, peak direct current generation bipolar locking, to there is larger power shortage in receiving-end system, now, if receiving end electrical network power tense peak period, system reserve is not enough, can cause frequency to decline, even need excision load to maintain system frequency in rated range.If utilize the capability of overload of all the other direct currents to carry out urgent power modulation, cutting load amount can greatly reduce does not even need cutting load.
At three Hua Lian net initial stages, stabilization of power grids outstanding problem, if Central China send East China a direct current generation bipolar locking, a large amount of trends are transferred on the extra-high voltage AC circuit of Jinan-Xuzhou, cause system unstability, need sending end to excise a large amount of units, loaded in a large number by tip cut-off and could keep power grid operation.If utilize the capability of overload of all the other direct currents to carry out urgent power modulation, receiving end electrical network cutting load amount significantly reduces, and the effect that many times direct currents are coordinated urgent power modulation is fairly obvious.
Consider that urgent whether modulation of direct current power is compared as follows the impact of the stability of a system and peace control means:
(a) do not consider the urgent power modulation of direct current
After three Hua Lian nets, when giving again DC bipolar block, need sending end electrical network to cut machine, receiving end cutting load guarantee system stable operation.For maintaining Central China, send after the DC bipolar block fault of East China, the stability of the relative major network in Central China and the relative major network in East China, the measure that need to take is:
DP
long south=P
long south+ PDC-PMAX
long south+ CP1
DP
ji Xu=P
ji Xu+ PDC-PMAX
ji Xu+ CP2
And be to meet the requirement of peace control means amount, in Central China Power Grid, cut being combined as of machine and East China Power Grid cutting load:
DP
long south=2/3 * Cgen+1/3 * Cload
DP
ji Xu=1/3 * Cgen+2/3 * Cload
DP=max (DP
long south, DP
ji Xu)
DP wherein
long southand DP
ji Xurespectively the measure amount that the synchronism stability sexual needs for maintaining between Central China and major network and East China and major network are taked, P
long south, P
ji Xuthe initial power that ultra high voltage Changzhi～Nanyang, Jinan～Xuzhou circuit are carried, PMAX
long southand PMAX
ji Xuit is the steady state stability limit of ultra high voltage Changzhi～Nanyang, Jinan～Xuzhou circuit, PDC is the power that bipolar locking direct current occurs, CP1 and CP2 are the overshoot existing due in electrical network oscillatory process, and on San Hua Da district interconnection, being about 800MW:Cgen and Cload is respectively magnificent middle filling machine and East China cutting load amount.Final peace control means amount DP is by DP
long southand DP
ji Xumaximum determine.
If give again DC bipolar transmission power 4800MW, and ultra high voltage Changzhi～Nanyang, Jinan～Xuzhou transmission power is respectively 4000MW, 5000MW, its quiet 6700MW and 7500MW of being surely respectively, in requisition for peace control amount be about 2800MW and 3100MW, relatively comprehensive, from giving again the peace control means amount of DC bipolar block needs, by guaranteeing that East China Power Grid and major network maintenance are synchronizeed, decide, need Central China Power Grid to cut 4000MW unit, East China Power Grid is cut 2500MW load, corresponding effect DP Ji Xu=1/3 * 4000+2/3 * 2500=3000MW on the interconnection of ultra high voltage Jinan～Xuzhou.Sending end electrical network and receiving end electrical network all will be subject to tremendous influence in this case.
(b) the many time direct currents of consideration based on PMU are coordinated urgent power modulation
When taking Central China to send East China emergency DC power raising function, many times direct current powers are promoted to 1500MW, just can avoid the inner cutting load of East China Power Grid.It is 24900MW that East China D.C. capacity sum is sent in all the other Central China, considers 50% Short term overload ability and 10% long-term capability of overload, therefore possesses the condition of urgent power ascension.
If only born the power ascension amount of 1500MW by direct current, need the specified transmission capacity of direct current and capability of overload to meet this requirement, and after single time direct current power significantly promotes, sending end and receiving end AC system are had to considerable influence, part passage trend may be heavily loaded, also causes reactive power consumption to increase after power ascension, if when this DC inversion station alternating current filter reactive power compensation is not enough, direct current will absorb from receiving-end system idle in a large number, cause receiving-end system voltage drop.
If carry out the required power ascension amount of shared by many times direct currents, power ascension instruction and power ascension amount are sent to direct current each time by wide area measurement system, every time direct current lifting capacity is directly proportional to its specified transmission capacity and capability of overload, like this, every time direct current power lifting capacity reduces relatively, sending end and receiving end AC system trend distribution influence are also diminished thereupon, and Inverter Station is comparatively disperseed idle demand.
Known according to the geographical distribution of several times direct current sending end current conversion stations, should magnificent direct current, woods maple direct current, imperial political affairs direct current, Ge Nan direct current sending end be pipe of reinforced concrete at Three Gorges Power Station unit, Si Hui direct current converting plant is equivalent to an electrical node; Giving again direct current, bright and beautiful Su Zhiliu, small stream Zhejiang direct current sending end is Drainage Area of Jinsha River power station unit, close together between San Hui direct current converting plant, and apart from each other between pipe of reinforced concrete at Three Gorges Power Station and power station, Jinsha jiang River.Except the direct current of small stream Zhejiang, all the other direct current receiving ends are all in southern Jiangsu electrical network and Shanghai Power Network, and distance is relatively near.Consider sending end and the constraint of receiving end rack, electric network transportation ability and direct current transmission capacity difference, the Ge Nan direct current that can send at pipe of reinforced concrete at Three Gorges Power Station, should magnificent direct current, carry out the coordination of urgent power modulation between woods maple direct current, imperial political affairs direct current, the coordination of carrying out urgent power modulation between direct current, bright and beautiful Su Zhiliu, small stream Zhejiang direct current is given in answering of sending in Drainage Area of Jinsha River power station.In pipe of reinforced concrete at Three Gorges Power Station, after a certain direct current generation locking, by other direct currents of pipe of reinforced concrete at Three Gorges Power Station, jointly carry out urgent power ascension, in Drainage Area of Jinsha River power station, after a certain direct current generation locking, by other direct currents of Drainage Area of Jinsha River power station, jointly carry out urgent power ascension.
The utmost point control device of DC transmission system rectification side and inversion side can quick adjustment direct current transportation power, so the urgent power modulation of direct current coordinates to control and can carry out in direct current sending end, also can carry out in direct current receiving end.Compare, direct current receiving end drop point close together, is easy to transmission and the exchange of Wide-area Measurement Information, and receiving end electrical network benefit after implementing many direct currents coordination control is more, therefore in receiving end, carries out the coordination control of the urgent power modulation of direct current.
In the urgent power modulation coordinated control system design of alternating current-direct current based on wide area, the current conversion station outlet place transformer stations such as, Fengxian new in China, Feng Jing, south bridge arrange control sub-station, they can detect the single, double utmost point block signal of corresponding direct current and be forwarded to controlling center, can receive the order that main website sends simultaneously and be forwarded to corresponding DC converter station, carrying out the coordination of many times direct currents and control.
Claims (4)
1. the urgent power modulation system of many times direct currents based on PMU, for many times DC transmission system are carried out to power modulation coordination, described DC transmission system comprises current conversion station, it is characterized in that, described modulating system comprises transducer, PMU device, GPS, controlling center and sender unit, described PMU device is connected with current conversion station by transducer, described controlling center communicates to connect with PMU device, sender unit respectively, described GPS is connected with PMU device, and described sender unit is connected with current conversion station.
2. a kind of urgent power modulation system of many times direct currents based on PMU according to claim 1, is characterized in that, described transducer comprises voltage sensor and current sensor.
3. a kind of urgent power modulation system of many times direct currents based on PMU according to claim 1, is characterized in that, described PMU device is provided with a plurality of.
4. a kind of urgent power modulation system of many times direct currents based on PMU according to claim 1, it is characterized in that, described controlling center comprises receiver module, data processing module, memory module and sending module, described data processing module connects respectively receiver module, memory module and sending module, described receiver module and the communication connection of PMU device, described sending module and sender unit communication connection.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956728A (en) * | 2014-04-30 | 2014-07-30 | 中国南方电网有限责任公司超高压输电公司广州局 | Double-circuit power control method for common-tower double-circuit direct current transmission system |
| CN104810865A (en) * | 2015-04-21 | 2015-07-29 | 中国电力科学研究院 | Trans-regional alternating-current and direct-current coordinated control method for handling with successive faults of direct-current valve group |
| CN109066758A (en) * | 2018-08-07 | 2018-12-21 | 南方电网科学研究院有限责任公司 | Electric energy management regulation device and HVDC transmission system |
-
2013
- 2013-05-15 CN CN201320265132.8U patent/CN203491710U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956728A (en) * | 2014-04-30 | 2014-07-30 | 中国南方电网有限责任公司超高压输电公司广州局 | Double-circuit power control method for common-tower double-circuit direct current transmission system |
| CN104810865A (en) * | 2015-04-21 | 2015-07-29 | 中国电力科学研究院 | Trans-regional alternating-current and direct-current coordinated control method for handling with successive faults of direct-current valve group |
| CN109066758A (en) * | 2018-08-07 | 2018-12-21 | 南方电网科学研究院有限责任公司 | Electric energy management regulation device and HVDC transmission system |
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Granted publication date: 20140319 |