阅读说明：本技术 一种防电磁干扰的保护快速启动方法及系统 (A kind of the protection quick start method and system of anti-electromagnetic interference ) 是由 杨青松 康丰 李玉平 张玮 王闰羿 于 2019-09-18 设计创作，主要内容包括：本发明公开了一种防电磁干扰的保护快速启动方法及系统,保护启动方法包含如下步骤：对被保护系统的三相电压或电流按照固定的采样频率进行采样,获取各个采样时刻的瞬时值；将当前采样时刻的瞬时值和四分之一周波前采样时刻的瞬时值求平方和,计算得到当前采样时刻的峰值平方电压或电流；根据计算得到的峰值平方电压或电流进行保护启动的判别。本发明所提供的技术方案,利用峰值平方电压或电流计算数据窗短且精度高的特点,将突变量启动快速以及相量启动准确的优点相结合,能够有效区分外部电磁环境产生的干扰与实际发生的故障,提高电力系统继电保护的速动性与可靠性。(The invention discloses a kind of protection quick start method of anti-electromagnetic interference and systems, protect starting method to comprise the following steps: sampling to by the three-phase voltage of protection system or electric current according to fixed sample frequency, obtain the instantaneous value of each sampling instant；By the instantaneous value of the instantaneous value of current sample time and a quarter Zhou Boqian sampling instant it is squared and, the peak value squared voltage or electric current of current sample time is calculated；The differentiation of protection starting is carried out according to the peak value squared voltage or electric current that are calculated.Technical solution provided by the present invention; the feature short and with high accuracy using peak value squared voltage or galvanometer calculation data window; Sudden Changing Rate is started quickly and phasor starts accurate advantage and combines; can the effective district interference that divides external electromagnetic environment to generate and the failure that actually occurs, improve the quick-action and reliability of relay protection of power system.)

1. a kind of protection quick start method of anti-electromagnetic interference, which comprises the steps of:

It is sampled to by the three-phase voltage of protection system or electric current according to fixed sample frequency, obtains each sampling instant three The instantaneous value of phase voltage or electric current；

By the instantaneous value and a quarter Zhou Boqian sampling instant three-phase voltage or electricity of current sample time three-phase voltage or electric current The instantaneous value of stream it is squared and, the peak value squared voltage or electric current of current sample time three-phase voltage or electric current is calculated；

The differentiation that protection starting is carried out according to the peak value squared voltage or electric current that are calculated, if voltage protection or current protection are Over-voltage or overcurrent then determine that peak value squared voltage or electric current are greater than starting given threshold, if voltage protection or current protection are deficient Pressure or undercurrent then determine that peak value squared voltage or electric current are less than starting given threshold, and current sample time plays continuous setting quantity Peak value squared voltage or electric current when meeting above-mentioned decision condition, corresponding voltage protection or current protection starting open.

2. a kind of protection quick start method of anti-electromagnetic interference according to claim 1, which is characterized in that described current The instantaneous value of sampling instant three-phase voltage or electric current is respectively x_a(t0), x_b(t0), x_c(t0), t0 is current sample time, described four points One of the instantaneous value of Zhou Boqian sampling instant three-phase voltage or electric current be respectively x_a(t0-T/4), x_b(t0-T/4), x_c(t0-T/4), T is sampling The period of voltage or electric current, t0-T/4 are a quarter Zhou Boqian sampling instant.

3. a kind of protection quick start method of anti-electromagnetic interference according to claim 2, which is characterized in that described current The peak value squared voltage or electric current of sampling instant three-phase voltage or electric current are respectively as follows:

x_{a(t0)_tss}=x_a(t0) ²+x_a(t0-T/4) ²；

x_{b(t0)_tss}=x_b(t0) ²+x_b(t0-T/4) ²；

x_{c(t0)_tss}=x_c(t0) ²+x_c(t0-T/4) ²。

4. a kind of protection quick start method of anti-electromagnetic interference according to claim 1, which is characterized in that over-voltage is owed Press the starting given threshold of protection are as follows: U_{set_tss}=2*K_rel ²*U_set ², U_setFor the movement definite value of voltage protection, K_relFor coefficient, K when over-voltage_relValue range is 0.97~0.99, K when under-voltage_relValue range is 1.01~1.03.

5. a kind of protection quick start method of anti-electromagnetic interference according to claim 1, which is characterized in that overcurrent is owed Flow the starting given threshold of protection are as follows: I_{set_tss}=2*K_rel ²*I_set ², I_setFor the movement definite value of current protection, K_relFor coefficient, K when overcurrent_relValue range is 0.97~0.99, K when undercurrent_relValue range is 1.01~1.03.

6. a kind of protection quick start method of anti-electromagnetic interference according to claim 1, which is characterized in that the setting Quantity is N/4, and N is the sampling number in one cycle of sampled voltage or electric current.

7. a kind of protection quick start system of anti-electromagnetic interference characterized by comprising

Sampling module is obtained for sampling to by the three-phase voltage of protection system or electric current according to fixed sample frequency The instantaneous value of each sampling instant three-phase voltage or electric current；

Peak value squared voltage or current calculation module, for by the instantaneous value of current sample time three-phase voltage or electric current and four points One of Zhou Boqian sampling instant three-phase voltage or electric current instantaneous value it is squared and, current sample time three-phase voltage is calculated Or the peak value squared voltage or electric current of electric current；

Voltage or current protection start discrimination module, for carrying out the differentiation of protection starting to peak value squared voltage or electric current, if Voltage protection or current protection are over-voltage or overcurrent, then determine that peak value squared voltage or electric current are greater than starting given threshold, if electric Pressure protection or current protection are under-voltage or undercurrent, then determine that peak value squared voltage or electric current are less than starting given threshold, currently adopt When continuously the peak value squared voltage of setting quantity or electric current meet above-mentioned decision condition from the sample moment, corresponding voltage protection or electricity Stream protection starting opens.

8. a kind of protection quick start system of anti-electromagnetic interference according to claim 7, which is characterized in that over-voltage or The starting given threshold of under-voltage protection are as follows: U_{set_tss}=2*K_rel ²*U_set ², U_setFor the movement definite value of voltage protection, K_relTo be Number, K when over-voltage_relValue range is 0.97~0.99, K when under-voltage_relValue range is 1.01~1.03.

9. a kind of protection quick start system of anti-electromagnetic interference according to claim 7, which is characterized in that overcurrent is owed Flow the starting given threshold of protection are as follows: I_{set_tss}=2*K_rel ²*I_set ², I_setFor the movement definite value of current protection, K_relFor coefficient, K when overcurrent_relValue range is 0.97~0.99, K when undercurrent_relValue range is 1.01~1.03.

10. a kind of protection quick start system of anti-electromagnetic interference according to claim 7, which is characterized in that described to set Fixed number amount is N/4, and N is the sampling number in one cycle of sampled voltage or electric current.

Technical field

The invention belongs to Relay Protection Technology in Power System field, the protection more particularly to a kind of anti-electromagnetic interference is quickly opened Dynamic method and system.

Background technique

With the extensive use of the raising of voltage class and electronic equipment in the power system, the problem of electromagnetic interference day Benefit is prominent.Especially power plant and substation, as the concentration place of electric system primary equipment and secondary device, system operation Mode, which changes, switchs divide-shut brake, lightning surge etc., all can generate interference to secondary circuit, so that protective relaying device is anti-interference Capability Requirement is higher and higher.In addition to inhibiting electromagnetic interference using measures such as shielding, ground connection, filtering, isolation on hardware, can also it pass through Software analyzes sample waveform, distinguishes electromagnetic interference and failure.

Electromagnetic interference has high frequency, of short duration feature, and protection starting element is arranged usually to improve it in protective relaying device Reliability.Common starting method has Sudden Changing Rate starting and phasor starting.It is fast that Sudden Changing Rate starts speed, but threshold value compares mould Paste, anti-interference ability is weaker, reduces the reliability of relay protection, the shadow that phasor starting calculates data window for elimination noise spot It rings, the delay of at least one cycle need to be increased, reduce the quick-action of relay protection.

Summary of the invention

To overcome the deficiencies in the prior art, the present invention electromagnetic environment severe for power plant and substation is mentioned For the protection quick start method and system of a kind of anti-electromagnetic interference, the mistake that voltage and current is protected when fault-free in power grid is avoided It is dynamic.

To achieve the above object, the technical solution adopted by the present invention are as follows:

A kind of protection quick start method of anti-electromagnetic interference, which comprises the steps of: to by protection system Three-phase voltage or electric current sampled according to fixed sample frequency, obtain the wink of each sampling instant three-phase voltage or electric current Duration；

By current sample time three-phase voltage or the instantaneous value and a quarter Zhou Boqian sampling instant three-phase voltage of electric current Or electric current instantaneous value it is squared and, the peak value squared voltage or electricity of current sample time three-phase voltage or electric current is calculated Stream；

The differentiation of protection starting is carried out according to the peak value squared voltage or electric current that are calculated, if voltage protection or electric current are protected Shield is over-voltage or overcurrent, then determines that peak value squared voltage or electric current are greater than starting given threshold, if voltage protection or current protection For under-voltage or undercurrent, then determine that peak value squared voltage or electric current are less than starting given threshold, current sample time plays continuous setting When the peak value squared voltage or electric current of quantity meet above-mentioned decision condition, corresponding voltage protection or current protection starting are opened.

A kind of protection quick start method of anti-electromagnetic interference above-mentioned, which is characterized in that the current sample time three The instantaneous value of phase voltage or electric current is respectively x_a(t0), x_b(t0), x_c(t0), t0 is current sample time, a quarter Zhou Boqian The instantaneous value of sampling instant three-phase voltage or electric current is respectively x_a(t0-T/4), x_b(t0-T/4), x_c(t0-T/4), T is sampled voltage or electric current Period, t0-T/4 be a quarter Zhou Boqian sampling instant.

A kind of protection quick start method of anti-electromagnetic interference above-mentioned, which is characterized in that the current time three-phase electricity Pressure or the peak value squared voltage or electric current of electric current are respectively as follows:

x_{a(t0)_tss}=x_a(t0) ²+x_a(t0-T/4) ²；

x_{b(t0)_tss}=x_b(t0) ²+x_b(t0-T/4) ²；

x_{c(t0)_tss}=x_c(t0) ²+x_c(t0-T/4) ²。

The protection quick start method of a kind of anti-electromagnetic interference above-mentioned, which is characterized in that over-voltage or under-voltage protection are opened Dynamic given threshold are as follows: U_{set_tss}=2*K_rel ²*U_set ², U_setFor the movement definite value of voltage protection, K_relFor coefficient, K when over-voltage_relIt takes Being worth range is 0.97~0.99, K when under-voltage_relValue range is 1.01~1.03.

The protection quick start method of a kind of anti-electromagnetic interference above-mentioned, which is characterized in that overcurrent or undercurrent protection are opened Dynamic given threshold are as follows: I_{set_tss}=2*K_rel ²*I_set ², I_setFor the movement definite value of current protection, K_relFor coefficient, K when overcurrent_relIt takes Being worth range is 0.97~0.99, K when undercurrent_relValue range is 1.01~1.03.

The protection quick start method of a kind of anti-electromagnetic interference above-mentioned, which is characterized in that the quantity that sets is N/4, N For the sampling number in one cycle of sampled voltage or electric current.

A kind of protection quick start system of anti-electromagnetic interference characterized by comprising

Sampling module, for being sampled to by the three-phase voltage of protection system or electric current according to fixed sample frequency, Obtain the three-phase voltage or current instantaneous value of each sampling instant；

Peak value squared voltage or current calculation module, for by the instantaneous value of current sample time three-phase voltage or electric current and The instantaneous value of a quarter Zhou Boqian sampling instant three-phase voltage or electric current it is squared and, current time three-phase voltage is calculated Or the peak value squared voltage or electric current of electric current；

Voltage or current protection start discrimination module, sentence for carrying out protection starting to peak value squared voltage or electric current Not, if voltage protection or current protection are over-voltage or overcurrent, determine that peak value squared voltage or electric current are greater than starting given threshold, If voltage protection or current protection are under-voltage or undercurrent, determine that peak value squared voltage or electric current are less than starting given threshold, when When the peak value squared voltage or electric current of the continuous setting quantity of preceding sampling instant meet above-mentioned decision condition, corresponding voltage protection Or current protection starting opens.

The protection quick start system of a kind of anti-electromagnetic interference above-mentioned, which is characterized in that over-voltage or under-voltage protection are opened Dynamic given threshold are as follows: U_{set_tss}=2*K_rel ²*U_set ², U_setFor the movement definite value of voltage protection, K_relFor coefficient, K when over-voltage_relIt takes Being worth range is 0.97~0.99, K when under-voltage_relValue range is 1.01~1.03.

The protection quick start system of a kind of anti-electromagnetic interference above-mentioned, which is characterized in that overcurrent or undercurrent protection are opened Dynamic given threshold are as follows: I_{set_tss}=2*K_rel ²*I_set ², I_setFor the movement definite value of current protection, K_relFor coefficient, K when overcurrent_relIt takes Being worth range is 0.97~0.99, K when undercurrent_relValue range is 1.01~1.03.

The protection quick start system of a kind of anti-electromagnetic interference above-mentioned, which is characterized in that the quantity that sets is N/4, N For the sampling number in one cycle of sampled voltage or electric current.

Advantageous effects of the invention: peak value squared voltage or electric current when the present invention utilizes sinusoidal waveform normal sample Keeping stable characteristic, peak value squared voltage or electric current instantaneously quickly increase when generating electromagnetic interference, and when actually occurring failure Peak value squared voltage or electric current persistently increase.The protection starts method by carrying out continuous multiple spot to peak value squared voltage or electric current Judgement, can evade that power plant and the transformer substation system method of operation change, the reasons such as switch divide-shut brake, lightning surge are to voltage electricity The electromagnetic interference of road generation is flowed back to, while being mutated from the moment quick start in a quarter cycle in failure.

The present invention by Sudden Changing Rate starting quickly and phasor start accurate advantage and combine, can effective district divide external electrical The interference that magnetic environment generates and the failure actually occurred, improve the quick-action and reliability of relay protection of power system, have good Good engineering application value.

Detailed description of the invention

Fig. 1 is that one of embodiment of the present invention protects quick start method flow chart.

Specific embodiment

A specific embodiment of the invention is illustrated with reference to the accompanying drawing.