CN110058100A - A kind of the Time delay measurement method, apparatus and system of DC transmission system - Google Patents
A kind of the Time delay measurement method, apparatus and system of DC transmission system Download PDFInfo
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- CN110058100A CN110058100A CN201910379597.8A CN201910379597A CN110058100A CN 110058100 A CN110058100 A CN 110058100A CN 201910379597 A CN201910379597 A CN 201910379597A CN 110058100 A CN110058100 A CN 110058100A
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- G—PHYSICS
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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
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Abstract
The present invention discloses the Time delay measurement method, apparatus and system of a kind of DC transmission system, according to the topology of DC transmission system, the delay of its entire link is divided into four parts: I/O interface link delay, pole control link delay, valve control link delay, submodule execute link delay.The delay of every part of links receives from it signal and starts, until transmitting a signal to lower system, every part of links delay can independent test, the beginning and end signal of delay test accesses Time delay measurement device, it is ensured that the consistency of measurement.By the test to DC transmission system entirety and part of links delay, play the role of to the optimization of subsequent delay, the compensation of control vital.
Description
Technical field
The present invention relates to electric system technical field of direct current power transmission, and in particular to a kind of Time delay measurement of DC transmission system
Method, apparatus and system.
Background technique
DC transmission system is widely used to the long distance power transmissions projects such as transferring electricity from the west to the east, and with flexible DC transmission skill
The development of art, flexible HVDC transmission system are more and more used for new-energy grid-connected, urban electricity supply, island island power supply, electricity
The occasions such as net interconnection.With coming into operation for domestic and international DC transmission system engineering, the stability problem as caused by current transformer
It gradually highlights, the report of different type oscillatory occurences is also being increased.Yin Congqi, " the flexible DC transmission system for thanking to little Rong etc.
The analysis of system oscillatory occurences is summarized with control method " in refer to multiple soft lineal system oscillatory occurences, especially Zhoushan five both at home and abroad
Hold some converter station in DC transmission engineering that high fdrequency component tripping occurs during networking operation switchs to isolated operation, damage is used
Family equipment；When the soft straight converter station in western Shandong DC engineering one end accesses AC network through weak grid, the high frequency of 1.2kHz or so occurs
Oscillation, causes system shutdown.
University both domestic and external, scientific research institution etc. are analyzed in terms of stability, research find system delay for
High frequency stability has large effect, thus, it is necessary to a kind of Time delay measurement method for DC transmission system is found, it is right
Accurate survey calculation is carried out in entirety delay, the delay of each section system of DC transmission system, is prolonged to facilitate discovery
When maximum link, the delay of each section system is optimized, the high frequency stability of DC transmission system is improved.
Summary of the invention
It is an object of the invention to provide a kind of Time delay measurement side for DC transmission system for prior art deficiency
Method, device collecting system carry out accurate survey calculation for entirety delay, the delay of each section system of DC transmission system,
To facilitate the maximum link of discovery delay, the delay of each section system is optimized, the height of DC transmission system is improved
Frequency stability.
In order to achieve the above objectives, the technical solution adopted by the present invention is that:
The delay of the entire link of DC transmission system is divided into four portions by a kind of Time delay measurement method of DC transmission system
Point: I/O interface link delay, pole control link delay, valve control link delay, submodule execute link delay；Every part of links delay
It receives from it signal to start, until sending a signal to lower system；
Delay test signal is cycle Sine wave or square-wave signal, and signal contains zero crossing, signal amplitude and period
Adjusting；
The link to be measured of the Time delay measurement signal access DC transmission system；The delay test signal of access is electric signal
Or optical signal；The endpoint signal of link to be measured passes through photoelectric conversion, and optical signal is switched to electric signal；According to delay test signal and
The electric signal waveform of link endpoint signal to be measured calculates link delay to be measured.
Further, when the delay test signal is sine wave, configuration conversion function, is used in DC transmission system
In converting square-wave signal for the sine wave received；The conversion function is as follows:
In formula, ε is deviation, negated negative rational, and x [n] is the value of current period delay test signal, before x [n-1] is
The value of one period delay test signal, k1,k2,k3For rational, k1≠k3,k2≠k3；When sine wave is from a- ε is less than to greater than a+
ε passes through threshold value a, and when being worth between [a- ε, a+ ε], square wave output valve is k1, when sine wave is from a+ ε is greater than to less than a- ε
When passing through threshold value a, and being worth between [a- ε, a+ ε], square wave output valve is k2, when sine wave value not [a- ε, a+ ε] it
Between when, square wave output valve be k3。
Further, the value range of the ε are as follows: 0≤ε≤0.1Um, UmFor the amplitude of delay test signal；
The value range of the threshold value a are as follows: -0.2≤a≤0.2.
Further, the delay of every part of links can independent test, according to corresponding of link delay, the electricity of stop signal
Signal waveform calculates corresponding link delay.
Further, when DC transmission system is the flexible HVDC transmission system using MMC topology, the delay of use is surveyed
Signal amplitude is measured no more than corresponding 1.5 times for referring to wave output signal rated value of system.
The present invention proposes a kind of DC transmission system Time delay measurement device simultaneously, and the Time delay measurement device includes:
Signal generating unit for issuing Time delay measurement signal, and accesses the link link to be measured of DC transmission system；Institute
Stating delay test signal is cycle Sine wave or square-wave signal, and signal contains zero crossing, and signal amplitude and period can adjust；Letter
The output port of number generating unit includes electric signal and optical signal two types；
Signal receives converting unit, defeated after DC transmission system link link to be measured for reception delay test signal
Signal out, and the optical signal of output is switched into electric signal；
Be delayed computing unit, and it is single that the Time delay measurement signal and signal for receiving signal generating unit electrical signal ports receive conversion
The two is compared calculating, exports delay data by the electric signal of member output.
The present invention also proposes a kind of delay measurement system of DC transmission system, is delayed including above-mentioned DC transmission system
Measuring device and DC transmission system, the measuring device exports delay test signal to DC transmission system, defeated from direct current
Electric system reception delay tests output signal of the signal after link link to be measured；
Waveform conversion module is configured in the DC transmission system, for passing through when Time delay measurement signal is sine wave
It converts function and converts square-wave signal for the sine wave received；
The conversion function is as follows:
In formula, ε is deviation, negated negative rational, and x [n] is the value of current period delay test signal, before x [n-1] is
The value of one period delay test signal, k1,k2,k3For rational, k1≠k3,k2≠k3；When sine wave is from a- ε is less than to greater than a+
ε passes through threshold value a, and when being worth between [a- ε, a+ ε], square wave output valve is k1, when sine wave is from a+ ε is greater than to less than a- ε
When passing through threshold value a, and being worth between [a- ε, a+ ε], square wave output valve is k2, when sine wave value not [a- ε, a+ ε] it
Between when, square wave output valve be k3。
Further, the value range of the ε are as follows: 0≤ε≤0.1Um, UmFor the amplitude of delay test signal；
The value range of the threshold value a are as follows: -0.2≤a≤0.2.
Further, when DC transmission system is the flexible HVDC transmission system using MMC topology, the delay of use is surveyed
Signal amplitude is measured no more than corresponding 1.5 times for referring to wave output signal rated value of system.
After adopting the above scheme, the invention has the benefit that
(1) the Time delay measurement method of DC transmission system provided by the invention can effectively measure direct current transportation transmission of electricity system
The delay of entirety of uniting and partial links；
(2) the Time delay measurement method of DC transmission system provided by the invention, converts square-wave signal for sine wave, can be with
Reduce the difficulty that test signal generates, reduces system components link period asynchronous caused delay time error.
Detailed description of the invention
Fig. 1 DC transmission system links measurement position and delay schematic diagram；
Fig. 2 DC transmission system Time delay measurement schematic device.
Specific embodiment
Below with reference to drawings and the specific embodiments, technical solution of the present invention is described in detail.
The invention proposes a kind of Time delay measurement method for DC transmission system, entirety to DC transmission system and
Portion link carries out Time delay measurement, and Fig. 1 show DC transmission system links measurement position and delay schematic diagram.
Embodiment of the method 1:
The delay of the entire link of DC transmission system is divided into four portions by a kind of Time delay measurement method of DC transmission system
Point: I/O interface link delay, pole control link delay, valve control link delay, submodule execute link delay；Every part of links delay
It receives from it signal to start, until sending a signal to lower system；
Delay test signal is cycle Sine wave or square-wave signal, and signal contains zero crossing, signal amplitude and period
Adjusting；
The link to be measured of the Time delay measurement signal access DC transmission system；The delay test signal of access is electric signal
Or optical signal；The endpoint signal of link to be measured passes through photoelectric conversion, and optical signal is switched to electric signal；According to delay test signal and
The electric signal waveform of link endpoint signal to be measured calculates link delay to be measured.
The delay of every part of links can independent test, according to corresponding of link delay, the electric signal waveform of stop signal,
Calculate corresponding link delay.
When DC transmission system is the flexible HVDC transmission system using MMC topology, the Time delay measurement signal width of use
Value is no more than corresponding 1.5 times for referring to wave output signal rated value of system.
Wherein, when the delay test signal is sine wave, the configuration conversion function in DC transmission system, being used for will
The sine wave received is converted into square-wave signal；The conversion function is as follows:
In formula, ε is deviation, negated negative rational, and x [n] is the value of current period delay test signal, before x [n-1] is
The value of one period delay test signal, k1,k2,k3For rational, k1≠k3,k2≠k3；When sine wave is from a- ε is less than to greater than a+
ε passes through threshold value a, and when being worth between [a- ε, a+ ε], square wave output valve is k1, when sine wave is from a+ ε is greater than to less than a- ε
When passing through threshold value a, and being worth between [a- ε, a+ ε], square wave output valve is k2, when sine wave value not [a- ε, a+ ε] it
Between when, square wave output valve be k3。
The value range of the ε are as follows: 0≤ε≤0.1Um, UmFor the amplitude of delay test signal；
The value range of the threshold value a are as follows: -0.2≤a≤0.2.
Embodiment of the method 2:
Time delay measurement is carried out to the whole of DC transmission system, i.e. the t15 time in measurement Fig. 1, measurement method is specifically wrapped
Include following steps:
Step 1: Time delay measurement signal being accessed to the link to be measured of DC transmission system, is at I/O device end in the present embodiment
The electric signal of Time delay measurement signal is added at son, Time delay measurement signal uses sine wave, measurement point t1 in the present embodiment.
Step 2: sine wave synchronization process is square wave by pole control system, is handed down to valve control system as reference wave；It will be sinusoidal
Wave synchronization process is that the conversion function of square wave is as follows:
In formula, ε is deviation, negated negative rational, and x [n] is the value of current period delay test signal, before x [n-1] is
The value of one period delay test signal, k1,k2,k3For rational, k1≠k3,k2≠k3；When sine wave is from a- ε is less than to greater than a+
ε passes through threshold value a, and when being worth between [a- ε, a+ ε], square wave output valve is k1, when sine wave is from a+ ε is greater than to less than a- ε
When passing through threshold value a, and being worth between [a- ε, a+ ε], square wave output valve is k2, when sine wave value not [a- ε, a+ ε] it
Between when, square wave output valve be k3。
The value range of the ε are as follows: 0≤ε≤0.1Um, UmFor the amplitude of delay test signal；
The value range of the threshold value a are as follows: -0.2≤a≤0.2.
Step 3: the reference wave that valve control system is issued according to pole control system generates modulated signal, is handed down to submodule.
Step 4: semiconductor unit is connected according to valve control order in submodule, and the signal hair of conducting is the letter of measurement point t5
Number.
Step 5: the endpoint signal of link to be measured, that is, measurement point t5 signal being passed through into photoelectric conversion, optical signal is switched into electricity
Signal.
Step 6: according to the electric signal waveform of delay test signal and link endpoint signal to be measured, that is, measurement point t1 and t5
Electric signal waveform calculates link delay to be measured, the as whole delay of the DC transmission system of the input signal.
Embodiment of the method 3:
Time delay measurement is carried out to the valve control link of DC transmission system, i.e. the t34 time in measurement Fig. 1, measurement method tool
Body includes the following steps:
Step 1: Time delay measurement signal being accessed to the link to be measured of DC transmission system, is by square wave reference in the present embodiment
The optical signal of wave signal, is input in valve control system, and measuring point is in t3；Square wave reference wave signal can use external in the present embodiment
Time delay measurement device generation can also directly be generated by grade control device.
Step 2: valve control system generates modulated signal, is handed down to submodule, measuring point is in t4 according to reference wave.
Step 3: the endpoint signal of link to be measured, that is, measurement point t4 signal being passed through into photoelectric conversion, optical signal is switched into electricity
Signal.
Step 4: valve control system is inputed to according to the electric signal waveform of delay test signal and link endpoint signal to be measured
The corresponding electric signal of reference wave square-wave signal and the electric signal waveform of t4 calculate link delay to be measured, the as input signal
Valve control system whole delay.
The invention also discloses a kind of DC transmission system Time delay measurement devices, are illustrated in figure 2 DC transmission system and prolong
When measuring device embodiment schematic diagram；Include:
Signal generating unit for issuing Time delay measurement signal, and accesses the link link to be measured of DC transmission system；Institute
Stating delay test signal is cycle Sine wave or square-wave signal, and signal contains zero crossing, and signal amplitude and period can adjust；Letter
The output port of number generating unit includes electric signal and optical signal two types；
Signal receives converting unit, defeated after DC transmission system link link to be measured for reception delay test signal
Signal out, and the optical signal of output is switched into electric signal；
Be delayed computing unit, and it is single that the Time delay measurement signal and signal for receiving signal generating unit electrical signal ports receive conversion
The two is compared calculating, exports delay data by the electric signal of member output.
The invention also discloses a kind of embodiment of the delay measurement system of DC transmission system, including direct current above-mentioned are defeated
Electric system Time delay measurement device and DC transmission system, the measuring device export delay test signal to DC power transmission system
System, from output signal of the DC transmission system reception delay test signal after link link to be measured；
Waveform conversion module is configured in the DC transmission system, for passing through when Time delay measurement signal is sine wave
It converts function and converts square-wave signal for the sine wave received；
The conversion function is as follows:
In formula, ε is deviation, negated negative rational, and x [n] is the value of current period delay test signal, before x [n-1] is
The value of one period delay test signal, k1,k2,k3For rational, k1≠k3,k2≠k3；When sine wave is from a- ε is less than to greater than a+
ε passes through threshold value a, and when being worth between [a- ε, a+ ε], square wave output valve is k1, when sine wave is from a+ ε is greater than to less than a- ε
When passing through threshold value a, and being worth between [a- ε, a+ ε], square wave output valve is k2, when sine wave value not [a- ε, a+ ε] it
Between when, square wave output valve be k3。
Wherein, the value range of the ε are as follows: 0≤ε≤0.1Um, UmFor the amplitude of delay test signal；
The value range of the threshold value a are as follows: -0.2≤a≤0.2.
When DC transmission system is the flexible HVDC transmission system using MMC topology, the Time delay measurement signal width of use
Value is no more than corresponding 1.5 times for referring to wave output signal rated value of system.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (9)
1. a kind of Time delay measurement method of DC transmission system, characterized in that by the delay of the entire link of DC transmission system point
It controls link delay, valve control link delay, submodule for four parts: I/O interface link delay, pole and executes link delay；Every part
Link delay receives from it signal and starts, until sending a signal to lower system；
Delay test signal is cycle Sine wave or square-wave signal, and signal contains zero crossing, and signal amplitude and period can adjust；
The link to be measured of the Time delay measurement signal access DC transmission system；The delay test signal of access is electric signal or light
Signal；The endpoint signal of link to be measured passes through photoelectric conversion, and optical signal is switched to electric signal；According to delay test signal and to be measured
The electric signal waveform of link endpoint signal calculates link delay to be measured.
2. the Time delay measurement method of DC transmission system as described in claim 1, which is characterized in that when the delay test is believed
Number be sine wave when, in DC transmission system configuration conversion function, for converting square-wave signal for the sine wave received；
The conversion function is as follows:
In formula, ε is deviation, negated negative rational, and x [n] is the value of current period delay test signal, and x [n-1] is the last week
The value of phase delay test signal, k1,k2,k3For rational, k1≠k3,k2≠k3；When sine wave is worn from less than a- ε to a+ ε is greater than
More threshold value a, and be worth between [a- ε, a+ ε] when, square wave output valve be k1, when sine wave is passed through from greater than a+ ε to a- ε is less than
Threshold value a, and be worth between [a- ε, a+ ε] when, square wave output valve be k2, when the value of sine wave is not between [a- ε, a+ ε],
Square wave output valve is k3。
3. the Time delay measurement method of DC transmission system as claimed in claim 2, which is characterized in that
The value range of the ε are as follows: 0≤ε≤0.1Um, UmFor the amplitude of delay test signal；
The value range of the threshold value a are as follows: -0.2≤a≤0.2.
4. the Time delay measurement method of DC transmission system as described in claim 1, which is characterized in that every part of links delay is equal
Can independent test corresponding link delay calculated according to corresponding of link delay, the electric signal waveform of stop signal.
5. the Time delay measurement method of DC transmission system as described in claim 1, which is characterized in that when DC transmission system is
Using MMC topology flexible HVDC transmission system when, it is defeated that the Time delay measurement signal amplitude of use no more than system corresponds to reference wave
1.5 times of signal rated value out.
6. a kind of DC transmission system Time delay measurement device, which is characterized in that the Time delay measurement device includes:
Signal generating unit for issuing Time delay measurement signal, and accesses the link link to be measured of DC transmission system；It is described to prolong
When test signal be cycle Sine wave or square-wave signal, signal contains zero crossing, and signal amplitude and period can adjust；Signal hair
The output port of raw unit includes electric signal and optical signal two types；
Signal receives converting unit, for output letter of the reception delay test signal after DC transmission system link link to be measured
Number, and the optical signal of output is switched into electric signal；
Be delayed computing unit, and it is defeated that the Time delay measurement signal and signal for receiving signal generating unit electrical signal ports receive converting unit
The two is compared calculating, exports delay data by electric signal out.
7. a kind of delay measurement system of DC transmission system, which is characterized in that including DC power transmission system as claimed in claim 6
It unites Time delay measurement device and DC transmission system, the measuring device exports delay test signal to DC transmission system, from
DC transmission system reception delay tests output signal of the signal after link link to be measured；
Waveform conversion module is configured in the DC transmission system, for passing through conversion when Time delay measurement signal is sine wave
The sine wave received is converted square-wave signal by function；
The conversion function is as follows:
In formula, ε is deviation, negated negative rational, and x [n] is the value of current period delay test signal, and x [n-1] is the last week
The value of phase delay test signal, k1,k2,k3For rational, k1≠k3,k2≠k3；When sine wave is worn from less than a- ε to a+ ε is greater than
More threshold value a, and be worth between [a- ε, a+ ε] when, square wave output valve be k1, when sine wave is passed through from greater than a+ ε to a- ε is less than
Threshold value a, and be worth between [a- ε, a+ ε] when, square wave output valve be k2, when the value of sine wave is not between [a- ε, a+ ε],
Square wave output valve is k3。
8. the delay measurement system of DC transmission system as claimed in claim 7, which is characterized in that
The value range of the ε are as follows: 0≤ε≤0.1Um, UmFor the amplitude of delay test signal；
The value range of the threshold value a are as follows: -0.2≤a≤0.2.
9. the delay measurement system of DC transmission system as claimed in claim 7, which is characterized in that when DC transmission system is
Using MMC topology flexible HVDC transmission system when, it is defeated that the Time delay measurement signal amplitude of use no more than system corresponds to reference wave
1.5 times of signal rated value out.
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